Construction lifter what are common security hidden danger

- Dec 11, 2017 -

Hoist users are responsible for ensuring the acceptance test and inspection can prove the whole installation work

conforms to the involved national safety technical regulations and standards, local laws and rules. All the tests and

inspections shall be carried out under supervision of competent department, and inspectors must be at the site.


Test and inspection shall cover at least the contents of following aspects:

(1) Test and inspection of general device

①Inspection of mast and tie-in of hoist must satisfy:

a. Location, dimension and load capacity of ground base shall meet the requirement;

b. Mast sections and racks are in good condition;

c. Mast has been installed correctly;

d. Mast is used and fixed according to the scheduled hoisting height;

e. Fastening of all the connecting bolts of mast section meet the requirement;

f. Fastening of racks meet the requirement;

g. Installation of tie-ins meets the requirement and the tightening of all connecting bolts meets the requirement;

h. Space between tie-ins and height of free end (remote elevation) of mast meet the requirement;

i. Installation positions of all the limit touch plates meet the requirement;

②Inspection of ground enclosure must satisfy:

a. Internal and external installation position of enclosure meets the requirement;

b. All the components of enclosure shall be with enough intensity and rigidness to guarantee correct running


c. Action of mechanical and electrical interlock devices of enclosure door is correct;

d. Installation of base-frame and the quantity, specification, layout and fastening of foundation bolts meet the


e. Cage and buffer device are installed correctly;

f. Installation position of cable drum is correct.

③Inspection of cage must meet:

a. Dimension and load capacity of cage meet the requirement;

b. Structure (including welding line) intensity and rigidness meet the requirement;

c. Dimension, intensity and electric-mechanic interlock device of cage’s entrance door meet the requirement and

the door can be opened smoothly; the exit door of cage cannot be opened during running;

d. All the guide rollers and safety hooks are installed correctly;

e. Cage floor is not damaged and not slippery;

f. Safety fence on the top of cage meet the requirement;

g. Cage top crane is in good condition and installed firmly enough on cage, and the position is right.

④Inspection of transmission mechanism (drive device) must satisfy:

a. Drive device is correctly installed on the top of cage and there is not crack and damage in the welding line of

relevant stressed parts;

b. Drive pinions are in good condition, and the meshing status with rack meet the requirement;

c. The tightening of back wheels and the interval between them and the rack’s back meet the requirement;

d. Reducers are in good condition, and the lubricant oil grade and oil level indicator meet the requirement;

e. Brakes are equipped with regulated function.

⑤Inspec)on of cable guide device must sa)sfy:

a. Installation position of cable guide is correct and the spacing meets the requirement;

b. Protective rubber strips on cable guide frame are in good condition;

c. Fastening of cable arm on the cage meet the requirement;

d. Installation and wiring of cable meet the requirement;

⑥Inspec)on of electrical system must sa)sfy:

a. Switch box and leakage protector shall be equipped;

b.Wire and cable shall be with good insulating property, free from damage and electric leakage;

c. Ground resistance shall not be more than 4Ω.

⑦Control system:

a. The full set of electrical control system is in good condition;

b. Installation site of all the control devices is proper and safe during use.

⑧Full range running Cage status must satisfy:

a. Safe distance between the highest point of full range running cage and the top of mast meet the requirement;

b. Distance between the lowest point of full range running cage and the ground meet the requirement;

c. Cage in the lowest travel position is in good condition and action of all the limit switches is correct and reliable.

⑨Inspection of operating environment:

a. Signs

There shall be product name plates at eye-catching location of hoist, showing information such as rated payload,

rated passenger and other technical parameters.

b. Passageway and surrounding environment

There is no barrier in running passageway of cage. The structure and components of hoist such as mast, tie-in and

landing devices etc. shall not be used to pull or hang scaffold, construction pipe, rope slogan and flag etc. Within 5m

around hoist base, well or ditch are not allow to dig, flammable and combustible articles or other sundries shall not be

piled up.

c. Distance between moving parts and building and fixed equipment

Safe distance between moving parts of hoist and building and fixed equipment shall not be less than 0.2m.

d. Distance between hoist and outside overhead power transmission line

The minimum safe operation distance between the outermost edge of hoist and side boundary of outside overhead

power transmission line shall conform to regulations of following table.

Voltage of outside overhead power transmission circuit (KV)






Minimum safe operation distance (m)



(2) Test and inspection of safe facilities

When general devices pass test and inspection and conform to requirements, some special tests and inspections

must be done to ensure safe use of hoist, the inspections shall cover following contents at least:

a. Test and inspection of anti-falling safety device shall satisfy:

Ensure that anti-falling safety device has been correctly installed; the safety device shall be in the regulated valid

period (valid period of falling protector is not more than 1 year since last test. After 5 years using, the safety device shall

be scrapped, calculating from the date of production that show on nameplate, and be replaced by a new one.); drop test

with rated load shall be done according to description in G ‘Cage Anti-falling Test’ of <Installation Manual>. The sliding

distance of cage in falling test shall meet the regulated requirement. After drop test, the safety device must be reset.