Safety inspection rules for the hottest truck cran

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Detailed rules for safety inspection of truck crane and tire crane (6)

4, 3 safety inspection of main parts

4, 3, 1 inspection of structural parts

4, 3, 1, 1 main stressed structural parts, welds should meet the design requirements, and there should be no defects such as pores, slag inclusions, undercut, offset and insufficient penetration

4, 3, 1 and 2 adopt the structure of high-strength bolt connection, and the connection surface shall be free of dust, oil and paint. The torque handle must be used to tighten according to the technical requirements

4, 3, 1, 3 structural parts shall be scrapped in case of one of the following conditions. A. if the main stressed structural parts are damaged due to instability, they shall not be repaired and shall be scrapped; For example, the boom is unstable and the joint is damaged

b. the bearing capacity of the main stressed structure is reduced due to corrosion. After inspection and measurement, when the bearing capacity of the component is reduced to 87% of the original design value, it shall be scrapped if it cannot be strengthened; However, when the design bearing capacity of the member is determined by the stability stress, the scrapping of the member should be considered separately

c. when the main stressed components produce large permanent deformation and make the mechanism unable to work normally and safely, if they cannot be repaired, they should be scrapped

d. in case of cracking of structural members and their welds, those belonging to the following situations shall be scrapped:

the material of structural members does not meet the design requirements; The design fatigue strength is not enough, resulting in fatigue cracks

4, 3, 2 hook inspection

4, 3, 2, 1 hook must have the manufacturer's quality certificate before it can be put into use. The rated lifting capacity shall be marked on the hook pulley block

4, 3, 2, 2 hook pulley block fasteners shall not be loose or fall off; Good lubrication and flexible rotation

4, 3, 2, 3 lifting hooks shall not be repaired and cast lifting hooks shall not be used

4, 3, 2, 4 the hook surface should be smooth and free of peeling, acute angles, burrs and other defects

4, 3, 2 and 5 hooks should be installed with devices to prevent wire rope from unhooking

4, 3, 2, 6 hooks shall be scrapped if one of the following conditions occurs:

a, cracks

b, the wear amount of the dangerous section reaches 10% of the original size

c, the opening degree increases by 15% compared with the original size

d, torsional deformation more than 10 °

e, plastic deformation of dangerous section or hook neck

4, 3, 3 inspection of steel wire rope

4, 3, 3, 1 steel wire rope for crane shall comply with the provisions of gb1102-74 round strand steel wire rope and have product certificate

4, 3, 3, 2 the model and specification of the steel wire rope used by the crane must be consistent with the design requirements. In case of any change, the safety factor requirements shall be met through strength calculation

4utm testing machine includes one or more vertical bearing columns, and it is not allowed to use braided and extended steel wire rope for 3, 3 and 3

4, 3, 3, 4 hoisting mechanisms should use multi strand non rotating steel "because it has really reached an impassable historical pass" wire rope. There shall be devices or measures to prevent the steel wire rope from twisting during the work

4, 3, 3, 5 wire ropes shall be arranged neatly on the drum, and the tail end shall be fixed firmly. When the hook is at the lowest position, there shall be no less than 2 safety rings on the drum

4, 3, and 3 have truly achieved the safety factor of one machine with multiple uses and six wire ropes. For the electronic universal testing machine, it is necessary to pay attention to what the lifting mechanism working level is not less than 4.5 when operating and storing; Less than 4 for telescopic mechanism; For the luffing mechanism, the safety factor during operation is not less than 4.5, and the safety factor of the luffing support wire rope is not less than 4, but the safety factor of the luffing wire rope during self installation is not less than 2.5

4, 3, 3, 7 the connection of the fixed end of the steel wire rope shall meet the following requirements:

a. when connecting with the rope clamp, it shall meet the requirements of the following table, and ensure that the connection strength is not less than 85% of the breaking force of the steel wire rope. The spacing between rope clamps shall not be less than 6 times of the diameter of the steel wire rope. The pressing plate of the rope clamp shall be placed on the side of the long side of the steel wire rope, and the steel wire rope shall be pressed by one third. It is forbidden to install it in a staggered manner. The extension of the short side of the steel wire rope shall not be less than 150mm, and it shall be wrapped and fixed with fine lead wire

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