QB explosion proof double girder bridge crane

This kind of product is suitable for workshop and warehouse with flammable and explosive mixture. All motors and electrical explosion-proof performance of explosion-proof crane shall comply with gb3836.2-2000 explosion proof electrical equipment for explosive gas environment Part 2: Flameproof "d", and the whole machine performance shall comply with JB / t5897-2006 explosion proof overhead crane.

QB explosion-proof double girder bridge crane (hereinafter referred to as crane) is designed according to the QD type in the standard of gb14405-93. The explosion-proof performance of explosion-proof electrical apparatus is manufactured according to the provisions of gb3836.1 General requirements for explosion-proof electrical design in explosive environment and gb3836.2 explosion-proof electrical apparatus and explosion-proof electrical apparatus "d" in explosive environment.

The crane is suitable for the installation and maintenance of the crane in the factory, power station, warehouse, stockyard and other fixed span with inflammable and explosive gas. The explosion-proof dangerous area of the crane is class 1 or class 2.

Application scope: Iron and steel metallurgy, hydropower, aerospace, shipbuilding, automobile, coal, petrochemical industry

The main process methods of main girder I. main girder blanking process measures 1.1 and web blanking 1.1.1. The steel plates shall be spliced according to the length of span L + 1000 / 2 L. the welding joint must be sheared (no direct material connection is allowed), and the rust and dirt within 20 mm on both sides of the weld (including the reverse side) shall be removed, and the interface gap shall not be greater than 0.8 mm. Note: for example, web height h ³ The width of the plate and the two ends of the weld must be added with process plate. 1.1.2. If the web also needs to be spliced in the height direction, it should be spliced first, and then spliced in the length direction. 1.1.3. Adoption φ 4. Spot welding shall be carried out with welding rod, the height of the welding joint shall not be more than 3mm, and the length of the welding section shall be 20 ~ 30mm. It is strictly forbidden to use large diameter welding rod for spot welding. 1.1.4. If the seam gap is more than 1 mm, the seam shall be cut first, the height of the weld shall not be more than 3 mm, and the weld shall be free of defects such as porosity and slag. 1.1.5. When welding the first piece of each batch, the welding specification and welding nozzle angle must be debugged, and welding can be carried out on the product only when it is suitable. 1.1.6. In order to ensure full penetration, δ³ When the thickness is less than 10 mm, the back side shall be cleaned by air shovel, air gouging and other methods. 1.1.7. Check weld size with template after welding. Allowable deviation of longitudinal axis of weld bead Δ one £ 1mm, Δ twenty-one £ Mm, dislocation of two axes of front and back weld Δ three £ 1mm, Δ four £ 1mm. 1.1.8. When cutting with flame, the cutting shall be finished one time without interruption. Blanking camber curve: during blanking, the web should be fixed firmly to avoid warping and movement of web due to thermal deformation, resulting in inconsistent blanking camber. 1.1.9. Due to some factors (material, gas cutting specification, etc.), the camber of Web blanking is not consistent with that of backing block, so it should be adjusted in time. The camber of blanking is greater than that of the supporting block, and the remaining edge is left in the lower part of the plate. When the camber of blanking is less than that of backing block, the remaining edge should be left in the upper part of plate 1.1.10. 1.1.11. After the plate is cooled, check and record the blanking camber (at least five points must be measured for each plate), pair and mark, and then transfer to the next process. Note: pair and mark, that is, mark the front and back sides and left and right ends of two webs of the same main beam.

1.2 the length of the upper cover plate is 10005.2l, and the length of the lower cover plate is 10001l. 1.2.2. The upper and lower cover plates with the thickness of 6 ~ 8mm shall be welded according to the web splicing and welding method, adopting automatic welding or semi-automatic welding, without groove, and double-sided welding. one δ ten ³ The V-groove should be prepared by gas cutting, and the back side should be cleaned and sealed. use φ 5mm electrode for manual arc welding, see Table 3 for weld size. See Table 7 of "welding technical requirements" for welding specifications.

2. Send the profiling cutter for blanking. Note: a cut after the plate is fixed. B the upper cover plate material shall be matched with the web plate, so that the cover plate joint and the web plate joint shall be staggered by no less than 200 mm, and corresponding marks shall be made. 3. Deburring. 4. Send the flatbed machine for leveling( 5. The width and thickness of the upper and lower plates shall be checked, and the next process shall be carried out after passing the inspection. (Note: in this process, splicing before cutting is adopted instead of cutting before splicing)