LD type electric single girder overhead crane

 

2) Installation

1、            Install the driving device of crane moving system on the cross girder in the site

2、            Connect main girder and cross girder with high tension bolts referring to figure 2-a and figure 2-b. it should be guaranteed that shear shoulder on main girder connection plate should keep flat with horizontal plane of cross girder connection plate. To be on the safe side, it is allowed for users to make a slight but not too full welding on a, b and c by referring to the drawing to avoid deformation. Main girder and cross girder check after installation can be done in accordance with standard JB1306-94, corrosion and burr on the joint place of main girder and cross girder should be cleaned before installation.

3、            Install crane electrical equipment such as over-travel limit switch and switch box on the cross girder, connect related electrical parts, debug two crane moving motors to keep them move to the same direction

4、            Electric hoist can be installed on the main girder in advance, then mount on the rail, respective installation is also allowed

5、            Cabin can be connected before crane mounting on the rail or after. Concrete details should refer to site conditions

6、            Power sliding contact line device can be set up in accordance with figure 3 and

figure 4

7、            Connect all the electrical lines according to electrical diagram, after installation, crane must move to the direction that is set by control button

8、            Referring to figure 9 and table 5, users can set up resistance device and safety controller.

9、            Control cabin installation refers to figure 1, firstly install connection support 2 and cross girder with bolts, then connect connection 2 and 3 after connecting link frame 4 with control cabin 5

 

3) Use and rules

（1）General rule

1、Switch on under condition with no load, start and check all moving systems and safety device of control system, all of them should be flexible, accurate, safe and reliable.

2、Crane must have a safe and reliable grounding system, main loop ground insulation resistance after installation should not be less than work voltage 1000 ohms/v

3、It is prohibited to use the crane if the lifting capacity is more than stipulated lifting capacity.

（2）Operation safety rules

1、Driver must receive necessary training and has good eyesight and sense of hearing

2、Nobody is allowed to stand on the crane span structure when the crane works

3、To prevent starting a crane with trouble, “fault” warning board should be set near to press button switch or in the cabin.

4、Power supply must be cut off as the crane is being checked and maintained, check, lubricating and repairing are forbidden as the crane is working.

5、Unqualified steel wire rope is prohibited

6、Surface inspection for steel wire rope should be done at each crew changing time and a full check every 7-10 days.

7、As crane is working with load, the hook should be lifted at least one person’s height

8、As crane is working with load, the goods should be at least 0.5m higher than goods on the lifting line

9、Lifting objects are strictly forbidden to move over worker’s head

10、Moving with trouble for crane is forbidden, if it goes wrong as working, please immediately stop and maintain the crane.

（3）Driver’s responsibility

1、Drivers should be familiar with crane’s purpose, systems, control method, performance, maintenance and safety rules

2、Before operating the crane, check whether tools are left on the crane to avoid hurt people once falling down, then run all systems with no load, begin work after confirming everything goes well

3、Send a warning signal before staring the crane

4、Lifting objects with weight more than rated lifting capacity is strictly forbidden

5、It is not allowed to lift objects slantedly along the main girder

6、Moving and lifting objects should be done according to signal from ground commander, but drivers should stop the crane no matter who give the signal “stop”.

7、Crane controller should be started step by step, before the mechanism stops running totally, it is forbidden to brake by changing controller from positive position to reverse position.

8、It is not allowed to drag objects by using crane and trolley.

9、It is prohibited for people to leave crane with suspended objects or falling down hook

10、When the crane stops working, lift the hook and cut off the power supply.

4) Maintenance and overhaul

1、Make the following check for the crane every half a year, whether connection bolts of main end beam is loosen, whether shear shoulder on the connection plate of main end beam has flaw, whether bottom flange of joist steel has permanent down-warping deformation, once the trouble is found, stop and maintain the crane immediately.

2、Crane used outdoor should be painted on the appearance every year, crane indoor should be painted again every 3 years

3、Check whether wheels have flaw or overwearing, whether abrasion on the tread diameter of driving wheels at two sides is uniform, when abrasion on the wheel margin reaches 30% of original thickness or the flaw is found on the wheel, it should be changed; when two wheels tread diameter difference caused by uneven abrasion reaches 1/190 of its nominal diameter, please polish wheels again, but 10mm less than original nominal diameter is not allowed, change a new wheel in principle.

Wheels change method sees figure 11: loosen bolt 1, then take down 2, loosen bolt 4, then take down shaft slide plate and elastic ring washer, next pull out wheel axle 7, take down wheel 3, assembly order is contrary with that.

4、Crane moving system lubricating

（1）Take down oil plug 6, infuse calcium soap grease (GB491-65) to lubricate wheel bearings, the suggestion is to change grease once not more than 3 months, oil volume is 1/2-1/3 of bearing volume.

（2）Take down oil plug 8, infuse machine oil (GB443-64) with viscosity 5.11~5.89 ，E50, the suggestion is to change grease once not more than half a year.

（3）Daub often lubricating grease（GB491-65）on the exposed gear to ensure its lubricating.

5、steel wire rope

Sling rotating must be avoided as handling the objects.

Steel wire rope should be lubricated in a fixed period. Clean old grease with rag with kerosene (using steel brush to clean old grease and stain is absolutely forbidden). It will be declared useless if steel wire broken numbers in a lay length reaches that stipulated in table 3

Table 3

钢丝绳安全系数steel wire rope safety factor5.5	钢丝绳结构steel wire rope structure
	6×19=114		6×37=222
	交 互 捻Twisted numbers	同 向 捻Synclastic numbers	交 互 捻 Twisted numbers	同 向 捻 Synclastic numbers
	12	6	22	11

6、When crane brake can not meet the demand of working, please adjust tightness degree of motor tripping spring, referring to figure 12, take down fan guard 9, loosen set screw 8, then turn to adjust and tighten  nut 7, then loose a circle and a half, fix screw 8, adjustment is finished.

 

7、Electric hoist installation, use and maintainance should refer to the corresponding electric hoist specification

8、Driving device (take figure 20; 21 and table 4 as a reference)

 

 

Table 4 Code name of technical parameters and bearing

技术参数和所用轴承代号表 Code name table of technical parameters and bearing
速度（米/分）speed (m/min)	20	30	45	60	75
速比i1 Speed ratio	3.7	2.48	1.66	1.22	1
22  (m=2) 21	63 17	57 23	50 50	44 36	40 40
速比i2  Speed ratio	3.57
24 (m=2.5)   23	50 14
速比i3 Speed ratio	4.45
25(m=5)    26	49 11
总速比i General speed ratio	58.7	39.38	26.36	19.37	15.61
所用轴承代号Bearing code name	轴承A Bearing A	轴承B Bearing B	轴承C Bearing C		轴承 Bearing
	305 GB276-64	305 GB279-64	306 GB276-64		160507 GB276-64

 

 

 

 

 

 

5）Wearing parts list (with wearing parts drawing, electric hoist not included)         

Table 6

序号No	图     号Drawing No.	名     称Item	材    料Material	备    注Remark
1	LD20.20.102A	齿轮轴gear shaft	20CrMnTi
2	LD20.20.15A	齿圈 gear ring	40Cr
3	LD20.20.12	主动车轮 driving wheels	ZG45Ⅰ
4	LD20.20.21	被动车轮driven wheels	ZG45Ⅱ
5	Zg3.70	锥形制动环tapered brake ring	氯丁橡胶石棉树脂（详见图纸）Neoprene asbestos resin (details see drawings)	用于1.5KW电机1.5KW motor
6	ZDY3.70	平面制动环 plane brake ring		用于0.8KW电机0.8KW motor

 

Note: ground control motor 0.8KW（ZDY₁21-4）, cabin control motor 1.5KW （ZDR₁12-4）

 

 

6) Bearing detailed list (without electric hoist and driving device)

Table 7

 

 7) Product specification representation method

The product specification representation method is as bellows:

 

1、Ground control

For example: lifting capacity 3t, span 10.5m, moving speed 30m/min

Representation method LD3-10.5-30

2、Cabin control

For example: lifting capacity 20t, span 16.5m, moving speed 75m/min

Representation method LD20-16.5-75

 

8) Order requirements

1. Electric hoist installation, use and maintenance should refer to the corresponding electric hoist specification

2. Users should explain the followings (according to actual demand)

（1）lifting capacity           t

（2）span           m

（3）lifting height           m

（4）moving speed             m/min

（5）Working system                 JC=         ％

（6）Power supply              v             HZ

（7）Control mode (ground or cabin)         

（8）Control cabin door (at end or side)           ; control cabin form (open or closed)          ;

（9）Power supply importing way (plane current collector or soft cable);

（10）Crane moving rail width            mm (referring to figure 10 and table 6)

3、If problems are found as using the product, please contact our company as soon as possible so that we can better and improve the products

9)  Electric drawing

▲    Further warning

1、            It is strictly forbidden for crane (with electric hoist) to work with workers, people standing under heavy objects is strictly forbidden.

2、            Wedge joint for crane (electric hoist) steel wire rope must be in accordance with the regulation of GB5973-86 standard, steel wire rope head remaining length 200mm and install two rope clips to close and lock steel wire rope at wedge joint. Installation without license, maintenance and operation is strictly prohibited.

After crane (with electric hoist) finishes working, the height from hook to ground ≥ 2m.

Users can debug and start the crane after infusing oil into the reducer.