How a Intelligent Double Girder Grab Crane Handlle Slag in Steel-Making Plant ?

DATE: Jun 10th, 2023

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1. Project Background

Kingda crane intelligent double girder grab crane for slag handling is a new type lifting crane, it can be controlled by cab, by radio, by semi-automatic, by fully automatic or central control room.
Fitted with 3D scanner, motor encoder, PLC, data communication system and central processing system, it becomes an independent operation equipment, no need personal assistance, high efficiency, cost-saving.

Guangdong Shao Steel # 7 blast furnace is built up in 2013, have being service for the whole steel production plant as long as 10 years, it need a complete repair in hurry. At the same time, the plant owner-Guangdong Shao Steel wants to add intelligent elements to BF’S control system and operation.
# 7 blast furnace is 2200m³, including 3 iron notches, 2 casting house (C1 casting house and C2 casting house). Every casting house fitted with 1 set slag handling system, every set slag handling system fitted with 2 sets intelligent double girder overhead grab crane for slag handling.

2. Key Technical Parameter

No.	Item	technical parameter
1	Rated lifting capacity	main lifting(grab): 16t aux. hook:5t
2	working class	A6
3	grab volume	6m3
4	rail level	~13.50m
5	lifting height	grab: ~19m
6	lifting height	Aux.: ~19m
7	span	south water granulated slag
8	span	north water granulated slag
9	long travel length	~50m
10	power source	3 phases A.C. 380V 50Hz
11	crane power supply mode	steel sliding wire( opposite cabin room)
12	motor protection class	IP54
13	operation environment	outdoor, steam, strong corrosion
14	control mode	cabin, remote control, central control room
15	long travel speed	7.5~110m/min
16	cross travel speed	4.3~43.5m/min
17	lifting speed	4.2~42m/min
18	rail mode	QU70
19	others	1. grab's open-close direction should vertical to crane main girder; 2. all motors apply inverter motor, fitted with frequency inverter and inverter control electrical room; (aux. hook no need inverter); 3. fitted with crane positioning system, include lifting mechanism positioning encoder, grab open-close positioning encoder, long travel and cross travel positioning encoder, related proximity switch; 4. wire rope fitted with tension meter; 5. grab should be fitted with weighting device (electronic scale); 6. the crane can be controlled and operated in smart mode 7. grab should be fitted with sway control service; 8. crane's total width should be ≤8m

3. Technical Advantages

► This intelligent double girder grab crane is customized by end user’s strategy requirement, conform to green development trends, manufactured depending on project’s features.
► Carry PLC control system, positioning system, sway-control intelligent integration system, positioning precision, high efficiency running;
► Mechanical design applies wide box weld girder and heavy duty structure, high tension anti-fatigue, cope with high-temperature, high-humidity, high-fog and high-corrosion;
► Combine smart perception system, can autocratically fulfill material’s grab, release and transportation operation under very low visibility high vapor environment.
► No need operation in crane’s working site, can be controlled in site through remote distribution and management system, can reduce operating worker’s work duty greatly.

4. Control mode

• Radio control
• Cab control
• Semi-automatic control
• Automatic mode
• Warehouse management system (WMS)

5. Scope of Supply

Kingda crane intelligent double girder overhead grab for slag handling follows the rule of Electromechanical integration to provide to the end user.
Intelligent system and subsidiary equipment list

No.	Mechanism	Technical requirement	Quantity	Suppiler
1	1. Intelligent double girder overhead grab crane for slag handling electrical parts
2	long travel motor	inverter motor; fitted with running position absolute encoder; encoder single is connected to crane PLC;	1 set	Kingda Crane
3	cross travel motor	inverter motor; fitted with running position absolute encoder; encoder single is connected to crane PLC;	1 set	Kingda Crane
4	lifting motor	inverter motor; fitted with running position absolute encoder; encoder single is connected to crane PLC;	1 set	Kingda Crane
5	grab open-close motor	inverter motor; fitted with lifting wire rope position absolute encoder; encoder single is connected to crane PLC;	1 set	Kingda Crane
6	crane position limiting device	long travel limit switch; cross travel limit switch; grab lifting-lowering limit switch; 2 sets crane anti-collision limit device	1 set	Kingda Crane
7	motor frequency transforming cabinet	crane travel motor, lifting motor and open-close motor, all motors' speed controlled by inverter; inverter can exchange data with crane PLC control system through hard-wired and network communication	1 set	Kingda Crane
8	PLC control system	can fulfill crane's control and protection independent; crane can be controlled in crane's cabin or control in remote under crane	1 set	Kingda Crane
9	compressor	service for electrical room,3D scanning device, providing compressed air to purge (outlet discharge:240m3/h; outlet pressure:0.8Mpa), the entrance set up filter to deal with sulphur steam	1 set	Kingda Crane
10	2. Intelligent double girder overhead grab crane for slag handling smart parts
11	2.1 intelligent operation system
12	wireless communications system	kingda crane duty for reserving equipment power supply interface (220V,AC,6A quantity:2 set) and RJ45 network port s piece; wireless AP parameter: operating frequency:5GHZ; throughput:450+Mbps; scope:5+KM; stable wide flow range should ≥150M	1 set	Kingda Crane
13	long travel running positioning system	kingda crane duty for reserving equipment power supply interface (220V,AC,6A quantity:1 set) and RJ45 network port 1 piece;	1 set	Kingda Crane
14	cross travel running positioning system	kingda crane duty for reserving equipment power supply interface (220V,AC,6A quantity:2 set, one for cross travel, the other for electrical room) and RJ45 network port 1 piece;	1 set	Kingda Crane
15	long travel running positioning correction	switching value single, to service for encoder correct position, the single is connected to crane PLC control system DI model	2 sets	Kingda Crane
16	cross travel running positioning correction	switching value single, to service for encoder correct position, the single is connected to crane PLC control system DI model	1 set	Kingda Crane
17	long travel running positioning detector	encoder, to detect crane long travel position, single send to crane PLC control system through ethernet;	1 set	Kingda Crane
18	cross travel running positioning detector	encoder, to detect crane cross travel position, single send to crane PLC control system through ethernet;	1 set	Kingda Crane
19	grab open-close detector	encoder, to detect grab lifting-lowering wire rope's position, single send to crane PLC control system through ethernet;	1 set	Kingda Crane
20	grab lifting-lowering detector	encoder, to detect grab lifting-lowering wire rope's position, single send to crane PLC control system through ethernet;	1 set	Kingda Crane
21	tension transducer	detecting position: grab's open-close wire rope	2 set	Kingda Crane
22	2. digital slag bath system
23	3D scanner	kingda crane duty for reserving equipment power supply interface (220V,AC,6A quantity: 2 set) and RJ45 network port 1 piece; scanner's power supply be controlled by electric relay, electric relay control single be connected to crane PLC control system DO module.	1 set	Kingda Crane
24	3D scanner single analysis-processing system	industrial computer	1 set	Kingda Crane

6. Technical Proposal Drawing

7. Equipment Maintenance

7.1 intelligent double girder overhead grab for slag handling crane is special equipment with high danger, there should be pointed workers to duty for operate, maintenance, inspect and repair, must be staff to guardianship when crane been carry out those operation; All limit switch, brake are in invalid, must repair and in valid again, then can be used again;
7.2 Before put into usage every time, operator must crane’s brake is in valid or not, guarantee it is in good working condition, then can carry out lifting operation;
7.3 When operate the crane, the crane operator must be concentrated, careful operation; Stricktly forbid grab to collide lifting limit switch, Stricktly forbid grab to collide pool wall, Stricktly forbid trolley to collide two side’s anti-collision;
7.4 After finishing operation every time, must move the grab out of the pool and 10cm from the ground, cut off main power, hang the switch box in specified place; Wash THE grab in clear, lubricate every transmission mechanism;
7.5 Every season, mechanic on leading, operative employees assist, to move the trolley to maintenance platform,
(1) Clean hoist trolley and open winch device;
(2) Fitted with bolts and nuts defecting component in enough;
(3) Lubricate trolley’s connecting shaft and limit switch axle;
(4) Test crane’s lifting limit switch and trolley’s left -right limit switch;
(5) Inspect and adjust crane’s lifting-lowering brake, should be in reliable, sensitive, two brakes should in same direction.

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