Single Girder Overhead Crane Monthly Inspection & Requirement

Classification

Monthly inspection project

Monthly inspection content and requirement

1

B

the whole crane performance

Machine noise testing

 Use the sound level meter to test the lifting and falling operation noise, the sound level meter equal to the stethophone, which can tell whether there is abnormality through the noise.

2

B

lifting abnormity inspection with full load

  See if the girder or hoist has  abnormal vibration when in full load lifting, and listen if all structures has abnormal sound, and if possible, touch the gear box and motor, to see if there is abnormal fever, then analyses the reasons and exclude the anomalies.

3

B

full load drop in check

Suspend during the full load, to see if the decline in volume is too big, if so, adjust the hoisting brake until the brake is normal.

4

A

the whole crane performance

check for the hoist trolley running

Observe if the gourd run car has any difficulty in climbing, running in the transverse skid, dangling, gnaw rail wheel, even  the flange climb. If there has check whether the girder rigidity is poor, the rail surface oil is dirty, or the running precision manufacturing and the assembly car is poor and so on.

5

A

Crane air brake test

Check whether there is obvious sync phenomenon during running and braking, if there is , adjust the cart running brake clearance, it’s better done by the same person, for the same feel.

6

A

Check in crane operation

Check whether there is abnormal in the operation of the crane in sinusoidal, twist, lateral sliding, skewed, wandering, gnaw rail, make records and look for reason.

7

B

check the brake in the crane operation

Check whether  brake acts flexible, and sliding distance is too large due to brake failure

8

B

wheel under pressure inspection

check four wheels of crane whether there is phenomenon like hovering and wether there is only three legs.

9

B

leakage check

heck whether there are leakage or seepage in the running of the trolley traveling.

10

A

insulation performance of complete machine inspection

check main circuit and control circuit separately with 500V megohmmeter. Insulated resistor at room temperature should be more than 1.0MΩin control circuit.

11

C

Inspection of the surface appearance quality.

Check whether there are rust ,painting removal and other damages on the surface of the crane.

12

A

crane traveling track

Inspection of the operation scope.

Check whether there is any obstacles during the whole traveling range of crane, whether clearance among crane and side and top of civil construction is too small, whether there is any dangerous that contact with lights, wiring tubes and other things, whether crane is too close to bare copper.

13

A

inspection of the resistance

Check whether travel stop-gear has deformation or damage, whether joint bolt is tight and whether the welding line has slight crackle.

14

C

Rail deformation inspection

Check whether there is abnormal deformation for the whole rail, which exceed the requirements of installation technology.

15

C

Track installation inspection

Check seaming of rail whether there is deformation, whether fixed bolts have been loosened, rail has moved side and tie plate has been loosened.

16

C

Rail wear inspection

Check whether thread and end of flange of I-steel rail has severe wear and tear, flaking or deformation.

17

C

main girder and end carriage

Main beam weld inspection

           Check whether there are crackles of welding line of main girder and end carriage.

18

C

wear and tear and deformation of main girder

Check whether thread and end of flange of I-steel rail has severe wear and tear and whether flange has plastic deformation.

19

C

Main and beam connection inspection

Check whether bolts have been loosened when main girder and end carriage adopt bolts to connect.

20

C

rail on the main girder inspection

Check whether there is abnormal deformation, whether joint bolts have been loosened and sealing has crackles.

21

B

Check whether cars on the main girder running stop occur deformation, damage, loss risk, if there’s any loose for connection bolts; if there is a crack of weld.

22

C

Check the buffer on the main and side beam

Joint bolts of knocking protection buffer that installs on stop-gear of main girder and end of end carriage should not has been loosened and crackles of buffer are not allowed.

23

B

motor

Motor heat checking

Check whether the motor has heating phenomenon. If there is such phenomenon, analyze the reason as that it is overloading, the voltage is too low or to brake too often and so on.

24

B

Motor abnormality inspection

The start of motor should not be too grudging. Too noisy and abnormal sounds are forbidden. If there are above phenomena, analyze the reason as that it is overloading, the voltage is too low and so on.

25

C

brake

worn condition inspection

For cone type motor, check worn condition of cone type brake ring and drive fan wheel axially with hand to find whether the running distance is too large. Check the running distance of the main conic motor axis to 1.5mm or it will be replaced. For plane brake or tile brake, the worn proportions amounting to 50% of original thickness should be replaced.

26

C

brake performance inspection

Check lifting brake whether there is unreliable brake or sliding distance is too large, if exists above phenomena, adjust the performance of brake.

27

C

Exceptional checking

Check each cone type brake whether the nuts has been loosened, each hinge part of linkage mechanism of electromagnetic brake whether there are severe worn, whether spring is loose. When brake, there is scream, check whether there are defects like relative friction between brake ring and brake piece or bad contact, whether spring is deformation.

28

C

reducer

gear drive sound inspection

Check whether gear drive sound is abnormal and analyze the reasons that lie in bad lubrication or severe wear and so on.

29

C

Exceptional checking

Check whether each reducer connection and fixed bolts has been loosened and whether there is a phenomenon. Check whether lifting reducer box has crackles caused by hook deflection. (or by lifting limiter failure)

30

C

drum device

worn condition inspection

Check whether there is wear and tear of rope groove for drum

31

C

shell of drum inspection

Check shell of drum whether there is damage.(due to lifting limiter failure to cause the off-pulley of hook.)

32

C

rope guider inspection

Check whether the wire rope has breach and whether the steel wire rope can successfully be ejected from rope guide when empty hook is descending.

33

C

Exceptional checking

Check whether the plywood and joint bolts of drum and joint bolts of rope guide have bee loosened and whether the slipper of rope guide moves successfully.

34

A

wire rope

broken wires inspection

check steel wire rope whether there is phenomenon like broken wires. When the number of broken wires are more than 10% of total numbers of steel wires, the steel wire rope should be rejected.

35

A

worn condition inspection

the diameter reduction after wire rope worn should not exceed 7% of nominal diameter, or the wire rope should be rejected.

36

A

deformation inspection

steel wire rope distorted or twisted because of lifting slant should be rejected.

37

B

corrosion inspection

surface of steel wire rope should not have tarnishing phenomenon and should be covered with lubricant oil but not too much dirt.

38

B

twist in the air fault inspection

Observe whether wire rope has been twisted(especially more than four wire rope), because the
steel wire-rope has not been slackened when binding the rope.

39

A

wire rope

Exceptional checking

Check critical area and safety circulation of steel wire rope frequently such as loosened dangerous of each fixed
part of steel wire -rope, leaking of oil of contact site and so on.

40

A

hook and pulley

Crack checking

There should be no harmful crackles of hook, block or shell of block.

41

A

There should not be unusual wear and tear of mouth of hook or block groove.

42

A

Exceptional checking

check whether the block has damage, bolts of hook are tight and the joint bolts are loosened, fixing bolts of balanced pulley are loosened.

43

A

Deformation inspection

Hook mouth can not have abnormal deformation

44

C

rotation inspection

Check whether the hook, the pulley  rotate flexible.

45

C

wheel

worn condition inspection

Wheel tread and the wheel rim on the inside surface shall not have abnormal wear and tear.

46

C

crackles inspection

         wheel surface shall not be abnormal cracks and breakage.

47

C

drive shaft and coupling

deformation inspection

            Check for deformation and vibration transmission shaft.

48

C

supporting inspection

Check if there is any loose for the shaft bearing bolt, oil supply situation,etc.

49

C

coupling inspection

check whether there is any abnormal phenomenon of worn condition, fixed condition and running condition of coupling

50

C

cab

fixed condition inspection

Check whether the joint bolts of Cab have been loosened
and welding line have crackles.

51

C

 working condition inspection

Check whether aeration, illumination or warming is reasonable and Cab shakes severely.

52

C

sign plate

conspicuity inspection

          check whether the location of tonnage plate is reasonable and obvious.

53

C

fixed condition inspection

Check whether bolts or rivets of tonnage plate and nameplate are loose.

54

B

power source device

Bare slide-wire
safety inspection

Check whether the distance between bare wire and other devices around is in accordance with the relevant regulation
requirement and whether there is relevant safety protection measure.

55

B

surface of
slide-wire
inspection

 Check whether there are defects like corrosion; burnish it with steel brush or sand paper to guarantee the electrical conductivity.

56

B

Insulation device

Damage of supporting insulator of slide wire is not allowed and connection part should not be loosened.

57

C

Cable introducing
device inspection

Check the worn state and tight state of strained steel wire rope supporting cable when adopts cable introducing device.

58

C

Slide wire safety
mark inspection

Check whether there is safety mark on non -conductor side connection surface of slide-wire and whether there is indicator light with electricity.

59

C

 current collector

Worn condition inspection

The unusual wear and tear of block of current collector, pins or bridle ring is forbidden.

60

C

Fixed state
inspection

Joint bolts of current collector and cable should not be
loosened and insulation of current collector should be fixed safely and reliably.

61

B

block turning state
inspection of current collector

Block of current collector should turn flexibly and
smoothly. Inject lubricant oil if there is fricative sound or it turns difficulty.

62

C

Spring of current collector inspection

Spring of current collector should not lack bounce because of rusting or fatiguing.

63

B

 wiring

wiring surface inspection

Built-in wiring is wired from collector to motor and each electrics. wiring includes rubber cable and electrical wire, outer damage is forbidden.

64

C

fixed connection inspection

                   All joint bolts should be tight.

65

B

cable remove inspection

check whether there are drawbacks like unusual bending or trauma in cables.

66

C

extend-retract performance of flat cable inspection

Check whether extend-retract performance of flat cable is low, flexibility is bad.

67

B

electromagnetic contactor

contact points and slug inspection

Open up the electromagnetism and observe whether
contact and slug have abnormal wear and tear and the end surface of slug is smooth and clean.

68

C

wiring fixed state inspection

check whether each wiring fixed bolt is loosened.

69

A

Connection action inspection

The act should be flexible and reliable and contact should be tight without block and adhesion.

70

A

pendant control

Appearance inspection

Button mark should be obvious and there is no damage out of the pendant switch.

71

A

Troubles abnormity
inspection

Connection part between pendant control and end of cable
should not have damage and there should not have trouble like broken wire.

73

A

lifting limiter switch

action inspection

Check whether the lifting position -limiter act flexibly, safely and reliably.

74

B

contact point inspection

Check whether the contact of switch has damages or worn condition. When damage is very severe, replace it on time.

75

C

Wiring fixed state inspection

Check whether the wiring fixed joint bolts has been loosen.

76

A

Spacing position
inspection

Lifting position-limiter switch can stop action immediately when hook block group ascend to the limited position. The distance from highest position of hook block group to
lowest position of winding drum should be more than 150MM.