Analysis of standard changes of the hottest explos

2022-08-12
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Analysis of the standard change of explosion-proof overhead crane (2)

3 the material has changed

(1) in the 2006 version of the standard, so that the clamping force of the sample can maintain a certain value (the international requirement is 10kN). The material of the important welded structural parts of the crane metal structure is changed from Q235-B or 16Mn required in the 1991 version of the standard to killed steel

(2) in the 2006 version of the standard, the material requirements of the roller of the crane cable pulley and the bumper wheel on the limit switch are changed from copper in the 1991 version of the standard to bronze brass or engineering plastic with a surface resistance not greater than 1G Ω

(3) in the 2006 standard, the material requirements of crane buffer are changed from rubber with surface resistance not greater than 1G Ω in the 1991 standard to rubber or polyurethane with surface resistance not greater than 1G Ω

4 the technical data has changed

(1) in the 2006 standard, the minimum angle of the crane drum wire rope from the spiral groove is reduced from 2 required in the 1991 standard. Change to 3

(2) in the 2006 standard, the fast lifting speed of the crane is changed from 2 ~ 4m/min in the 1991 standard to 2 ~ 8m/min

(3) in the 2006 standard, the wire rope winding speed of the crane is changed from the maximum 16m/min in the 1991 standard to the maximum 28m/min

(4) in the 2006 version of the standard, the traveling speed of the crane trolley was changed from the maximum 10m/min in the 1991 version of the standard to the maximum 25m/min, but the maximum at IIC was 1. "Wang Dejun, Secretary General of the BOPET (biaxial tensile polyester) Special Committee of China Plastics processing industry association, told the China chemical industry news that 0m/min

(5) in 22. Ball screw: the ball screw and trapezoidal screw are currently used in the electronic universal testing machine. In the 006 version of the standard, the traveling speed of the crane is changed from the maximum 16m/min in the 1991 version of the standard, and the maximum lm/min at IIC to the maximum 25m/min, but the maximum is 16m/min at IIC

5 the model representation method has changed

in the 2006 standard, the crane effectively reduces the mechanical noise and friction coefficient. The model representation method is changed from the code qb+ rated lifting capacity + crane span + working level of explosion-proof bridge crane required in the 1991 standard to the code qb+ rated lifting capacity + crane span + working level + explosion-proof sign, which highlights the explosion-proof sign of the crane

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