** Electric Overhead Traveling Crane (EOTC) & Gantry Crane **
A. Technical Specifications
1. Type of Girder:
- Single type and Double type
2. Lifting Capacity for Trolley Assembly:
- 5 tons/set up to 500 tons/set or upwards if necessary.
3. Span:
- 10 meters up to 50 meters (60 meters & upwards for gantry cranes)
4. Lifting Height:
4-a) 6 meters up to 30 meters (Overhead Crane)
4-b) 6 meters up to 100 meters (Gantry Crane)
5. Legs:
- 6 meters up to 30 meters (Gantry Crane)
6. Speeds for Hoisting, Traversing & Traveling Operations:
6-a) One speed & dual speeds or
6-b) Speed variations by inverter control.
7. Type of Crane Control:
7-a) By pendant push button type & remote control,
7-b) Cabin type
8. Power Feeding System
8-a) Crane Bars (trolley bar, bus bar or power conductor bar) used for Overhead Crane, Stacker & Reclaimer, etc.:
- As per your requirement (60A up to 3,200A according to the applicable type: Insulated Peanut type, Copper Headed Steel Rail type, Insulated Alumium Heavy Bar type, Insulated UB-Bar type and Insulated H-Bar type)
- Product catalogues for 5 types are available upon request.
8-b) Cable Reel used for Gantry Crane:
- As per your requirement (Motorized type, etc.)
9. Main Power:
- 3Ph, 380V-440V, 50Hz or 60Hz
10. Standards & Codes
10-a) Standards & Codes for Engineering, Designing and Manufacturing:
- FEM, ANSI, DIN, JIS, KS, etc. as required by the customer.
10-b) Standards for Mechanical & Electrical Components and materials:
- Korean Standards (KS) or Japanese Industrial Standard (JIS), unless otherwise specified in the customer's technical specifications.
- If required, European brands (ABB, Siemens, Schneider, AEG, etc.) of major electrical components such as motor, driver, PLC. etc. will be supplied instead of Korean brands.
11. IP class for motor, PLC, drive, etc.
- IP54 or IP55
12. Load test, Supervision and Commissioning at the site:
- To be provided if required by the customer.
B. General Terms & Conditions
* Engineers & Manufacturers:
- For heavy capacity of crane with no less than 100 tons: Kumoh Heavy Ind. Co., & Buil E&C Co., Korea (Sister company of Kumoh Corporation, Korea)
- For medium & light capacity of crane with less than 100 tons: Reputed crane manufacturers as Kumoh's subconractors in Korea
* Marketer & Supplier:
- Kumoh Corporation, Korea
* Country of Origin:
- Korea (South)
* Lead Time for Delivery:
- 2 months up to 6 months on the basis of FOB Korea terms, depending upon the technical specifications especially for lifting capacity, span, country of origins for mantrials & components, and control required for the crane.
* Payment Terms
- By irrevocable L/C at sight and/or telegraphic transfer (T/T)
* Packing
- By wooden box type of packing and wooden skid type of packing, which are applicable to each package for crane components.
C. General Description
- Lifting capacity of the cranes with single girder or double girder designed, now available with us to meet the world markets, ranges from 5 ton/set up to 500 tons/set.
- As regards the span of cranes, 5 meters up to 60 meters are within our scope of supply.
- Speeds for hoisting, traversing and travelilng operations can be satisfied to the customer's requirements by means of standardized hoists with motorized trolley or inverters especially for speed variations (VVVF).
- Quality products designed to KS, JIS or other international codes and standards such as FEM, ASME, ANSI, etc. are absolutrely supplied for the customers. In particular, major electrical components including electric motor, PLC and inverter of western European brands such as ABB, Siemens, Schneider, etc. are also supplied for the customer, if required.
- Major attachments and parts designed to be fitted with the cranes, as applicable to each type of crane, such as electric wire rope hoist, brake, lifting magnet system, spreader, coil lifter & grab, grapple, tong, hydraulic bucket, cable reel, trolley bar (power conductor bar), etc. are also supplied for replacement or complement as a unit.
C-1) Mechanical & Electrical Components
- Electro-magnetic brakes are suitable for hoisting, and shoe brakes activated by electro-hydraulic thrustors are generally used for traveling and traversing operation. Gear boxes are of the fully-enclosed oil bath type with either casted or welded castings. Traveling driving units are separately installed at each end of the crane. Gear box is mounted directly on the wheel shaft, whereas brake and motors are connected to the gearbox utilizing the flange. All wheels are equipped with roll bearings and are housed in either bogies or box typed end carriages. As regards the rope system, all cranes have welded roppe-drums made from welded steel tube with machined double grooves. All motors used for cranes have high torque and are designed for frequent full-load starts. Flange mounting of the motor is usually utilized for cranes because of its reliable shaft aligning without the help of special couplings.
C-2) Electrical Control Systems
- Secondary resistor control in one of the most generalized systems for controlling the speed of wound motor by means of speed variations made by adding or reducing resistance of the secondary circuit. Speed control brake control is a system for controlling the speede of motor by making a direct connection of hydraulic speed control brake with the motor along eith the secondary resistor control system. Eddy current brake control is operated for motor in such a manner that the magnetic poles are exited by a flow of DC and the drum is rotated, the drum cuts the lines of flux of the magnetic poles and eddy currents are generated in the drum, and these eddy currents effectively generate a magnetic field that is the crossing of the existing field of the poles. This phenomenon of opertion is used to produce a brake torque, retarding the rotation of the drum. The braking torque of the eddy current brake is determined by the exiting current magnitude and the speed of rotation of the drum. DC dynamic control system applies the principle of electrical dynamic braking system in such a manner that DC exciting current if the wound type motor produces electrical braking torque along with the AC current which are generated bt the secondary stator coil. This control system regulates the DC exiting current of motor according to the difference between the reference voltage determined by the master control switch and pilot-generated voltage, which is proportional to the motor speed. The system is recommended especially for heavy duty capacity of cranes. AC primary voltage control is a system for controling the speed of motor by regulating the primary voltage and current together with the secondary resistor control system. Inverter control is a system for controling the speed of squirrel cage type of motor by controling the voltage and frequency, which are on the sharp increasing demand nowdays, and it is strongly recommended that an inverter system be used for heavy duty of overhead cranes calling for the sophisticated control of speed variations and torque.
C-3) Design Capability to allow Most Attractive Prices
- As regards prices, such integrated electric mechanical systems as overhead cranes and gantry cranes largely depend on the applicable technical requirements especially for lifitng capacity, lifting height, speeds of hoisting, traveling and traversing operation, span, traveling distance, class of protection, method of control (by cabin, remote control and/or pendent push button switches), etc. As a result, your cranes will be most effectively and economically designed by our superb experienced design team on the basis of your technical specifications absolutely incorporated into each component and system in order for the equipment to optimize your requirements and market situations.
Thank you for your time and anticipated cooperation.
