Lifting capacity, lifting height, span, mechanism operating speed, working class, EOT crane total weight and wheel load.
1. Bridge crane lifting capacity: maximum allowable lifting weight during crane normal work.
2. Bridge crane lifting height: distance between spreader upper limit position and lower limit position.
3. Span: the distance between the wheel vertical centerline at both ends of the crane.
4. EOT crane each mechanism operating speed
(1) Overhead crane lifting speed: it is the extract device full loaded lifting speed when lifting mechanism motor at rated speed.
(2) Bridge crane traveling speed: it is the crane traveling speed when crane traveling mechanism motor at rated speed.
(3) Bridge crane trolley traveling speed: it trolley traveling speed when the trolley traveling mechanism motor at rated speed.
5. Working class: Indicators of the whole crane lifting full load level and lifting numbers degree, working class divided into A1-A8 total of eight levels, light duty (A1-A3), intermediate duty (A4, A5), heavy duty (A6, A7), extra heavy duty (A8).
6. Wheel load: the maximum vertical pressure that trolley weight and rated weight function on the crane traveling wheels, when bridge weight and trolley are in extreme position.
Overhead crane components:
1. Overhead crane mechanical parts: Including three mechanisms namely the lifting mechanism, trolley traveling mechanism and crane traveling mechanism. Hoisting mechanism is used for vertically lifting, trolley traveling mechanism is used for laterally move with load; crane traveling mechanism used for the lifting trolley and the items longitudinal move, in order to achieve handling, loading and unloading in a three-dimensional space.
2. Overhead crane metal structure part: consist of bridge and trolley.
3. Overhead crane electrical parts: consists of the electrical equipment and electrical lines.
EOT crane parts:
1. EOT crane bridge frame: consists of two main beams, two end beams, walkway, railings and other component parts. Its structure including two: box type overhead crane and truss type overhead crane.
2. EOT crane traveling mechanism: consists of motor, brake, reducer, coupling, transmission shaft, angle bearing box, wheels and other component parts.
3. Lifting trolley: consists of trolley frame, lifting mechanism and trolley traveling mechanism.
4. EOT crane lifting mechanism: consists of motor, brake, drive shaft, coupling, reducer, drum, fixed pulley block, wire rope and other component parts. Include single brake and double brake.
5. EOT crane driver’s cabin: the crane operator work place. Inside equipped with control device (linkage or cam controller), power protection box, signal equipment and lighting device. Only after the cabin door closed, the crane can start (limit protection). This prevents causing injury when crane start traveling while there was someone working on the crane or operator have not entered the cabin.http://www.craneus.com/
Overhead crane is like a bridge judging from the name of it. It is running on the rail track of high altitude support rail beam of the two sides. If there is a beam, called single beam, two beams for double beam.
It is worth mentioning that China single girder overhead crane, the part walking along the beam and the lifting part, often equipped together and hung under the beam, commonly known as electric hoist. Crane control generally including ground control or remote control, the operator walking on the ground needs to follow the crane move. Single girder overhead crane is with small lifting capacity, easy to operate.
Double girder overhead crane has two beams; there is a certain distance between the beams. The part walking along the beam and the lifting part equipped together in trolley, running across on the double beams. Double girder overhead crane is with relatively large lifting capacity, the operator working in the bridge crane’s control room. Ground commanders need to work cooperate with the operator in the driver’s cabin (control room).
Selection overhead crane on the premise that the plant (including open-air plant) has been incorporated into the bearing rail beams installed in civil engineering design. Without the bearing rail beam, when the plant needs to install crane, then should choose gantry crane which rails on the ground.
Overhead crane lifting capacity should be based on need and the bearing rail beam load-bearing capacity that the plant designs.
Overhead cranes generally have standard products, just make sure the lifting capacity, you can choose from the product catalog, is it single girder or double girder should be determined by the product model and specifications in line with the lifting capacity.
Used single girder overhead crane is one kind of used overhead crane, because its small size, it belongs to light lifting equipment, so the single girder overhead crane can be repeated reused after the plant demolition.
1. Before reuse the used single girder overhead crane, we must clarify its parameters, reuse of used single girder bridge crane with high professional, it must have professional technical engineers to assist; like any other sale of used equipment requires skill, used single girder overhead cranes are special equipment which need higher professional.
2. Users are most concerned about used single girder overhead crane quality and price, it involves many factors. Used single girder overhead cranes quality and safety factors have the most direct correlation with the use intensity, service life and whether with good maintenance of the original user.
3. Cost of secondary sales of used single girder overhead crane is relatively high, there is additional cost include: demolition costs, transportation costs, installation costs, replacement of damaged parts costs; these costs account for one quarter to one half or more of an used single girder overhead crane price; it is because crane is special equipment, its dismantling and transport has high risk, so it must have reasonable professional planning and arrangement in order to achieve cost-effective.
Therefore, with comprehensive view of the above factors, to buy and use the used single girder overhead crane requires professional evaluation, removal, transportation, installation, maintenance and other technical planning in later period, or else it is better to buy a new crane equipment which is more cost savings, more secure and efficient. If there is any crane related problem, you can leave us message at the bottom of this page.
Weihua Crane is professional material handling equipment manufacturer and servicer with largest production in global. Provide you with overhead crane, gantry crane, electric hoist, etc. of safe, reliable and efficient crane solutions and service
1. Hook set: extract device. Note: The hook surface must cracks; whether hook mouth part is wearing and pulley rim is broken.
2. Pulley blocks: including movable pulley block and fixed pulley block. Note: whether the surface with cracks; whether work pulley with flexible rotating, the pulley rim is broken or not.
3. Wire rope: connect the hook head and the lifting mechanism. Note: whether with broken wire, broken stocks, knotted, rust, pitting. Daub grease On the crane hoisting mechanism for lubrication.
4. Reel group: component in the lifting mechanism for winding the wire rope. Note: The gear coupling disc reel group is enclosed drive.
5. Reducer: it is to reduce the high speed of the motor to the need of each agency work speed. Commonly use horizontal reducer, vertical reducer. Note: Check the oil level; reducer smooth operation, there should be no beating, shock and severe or intermittent noise, sound evenly; and at the joint of the fastening must not loose.
6. Coupling: to join two revolving shafts with coaxial line layout or substantially parallel, torque transmission compensating for a little angular and radial offset at the same time. Note: lubrication, teeth wear.
7. Brakes: generally installed in high speed shaft of the mechanism to reduce the braking torque. Note: lubricating the axle pin (connecting shaft bolt) rotating parts; observe whether the brake pads with burning or with anxious burnt flavor; whether the brake drum friction surface with oil.
8. Wheel group: according to wheel rim: double wheel rim wheel, single wheel rim wheel. Note: wheel rim wear. When the wheel rim is less than 10 mm should be closely observed and timely replacement.
9. Buffer: used to absorb the energy generated by the collision of the EOT crane (or trolley) with block (or bump head) or collision of the adjacent EOT cranes on the same span. Include: rubber buffer and spring buffer. Note: To check whether it is in good condition.
10. Resistors: electric appliance used to limit the motor current. It is with smooth start to reduce the impact.
11. Conductive device: power conduction device and trolley conduction device. Safety conductor line, current collector, cable pulley.
12. Travel switch: can be divided into terminal switch (limit switch) and safety switch (protective switch). Terminal switch used to limit the operating range of the mechanisms, installed at the end of the stroke, commonly use models: LX10-11, LX7-1; safety switch is used to protect the personal safety, commonly use model: LX19A-111.
Weihua Crane is professional material handling equipment manufacturer and servicer with largest production in global. Provide you with overhead crane, gantry crane, electric hoist, etc. of safe, reliable and efficient crane solutions and services.