Production of steel coal scuttle

    (1.1 Material and equipment requirements

    All kinds of materials used in engineering construction should be given priority to products from major factories that have passed quality certification. Purchased materials must have a factory certificate and be inspected by a laboratory before they can be used in engineering construction.

    Regular maintenance, maintenance and updating of construction equipment, machinery and materials are required to ensure that they are kept in good condition during the construction process, especially for lifting machinery and steel structure processing equipment.

 

    (1.2 Production and installation of coal scuttle

    The steel coal hopper is made in segments and pieces on site, and assembled after being transported to the site. Each coal scuttle is made in three parts, namely the coal scuttle cover, the round bucket part, and the cone bucket. The cone bucket is made by the inverted method. That is, the big bucket is on the bottom; the small bucket is on the top, and the sections are reasonably considered according to the requirements of hoisting, that is, each section is controlled within 12t.

 

    The structural processing and installation steps are as follows:

    1 Stakeout and numbering

    Before making the bucket body, the full-time technician should first carefully read the technical requirements and instructions, and check the dimensions and directions between the drawings one by one, pay attention to whether the connection points between the parts and the connection parties correspond to the dimensions one to one, and found that there are questions If there is any problem, contact the relevant technical department to resolve. After the check is completed, a detailed technical explanation will be made to the construction team.

    1) Stake out the large sample on the sample table at a ratio of 1:1, and the small end of the large and small head should be 10mm long when lofting to prevent the small head of the coiled large and small head and the plate rolling machine from being frictionally pressed and the steel plate is generated After the burr is rolled, the excess part is cut by gas and smoothed.

    2) Technical problems encountered during the stakeout process, even if you contact the technical department to solve them. If the size change or material substitution does not match the original drawing, make changes in the drawing in time.

    3) After setting out, self-check against the drawings to check whether the samples meet the requirements of the drawings, check the number of samples, and report to a full-time inspector for inspection.

    4) When the steel plate needs to be spliced, the shape and size of the groove must be indicated at the joint, and the line shall be drawn after welding and correction.

 

    2 welding

    1 Preparation before welding

    1) The groove form should be processed according to the design drawings. When there is no regulation, the form and size of the groove should be selected according to the principles of ensuring welding quality, less filler metal, improving working conditions, facilitating operation, and reducing welding stress and deformation.

    2) Bevel preparation with automatic cutting knife. After beveling, clean the oxides, slag and spatters on the surface of the bevel, and repair and level the unevenness to ensure that the inner and outer walls of the base material are free of oil, paint, and rust, and the base material of the bevel and bevel The metallic luster is exposed within 15-20mm on both sides.

    3) After the welding groove is processed, the inspection shall be carried out as required, and the assembly can be carried out after being qualified. Allowable deviation value for welding parts assembly: allowable deviation of butt gap: ±1.0mm; allowable deviation of edge height difference: ±2.0mm.

 

    3 Selection and requirements of welding rod, welding wire, and flux:

    The bucket wall is made of Q345 material, E5015 electrode is used for welding, 3.2mm electrode is used for bottoming, and 4mm electrode is used for covering. E4315 welding rod is used for welding of cover, other iron parts and welding of wall and other iron parts. The welding rod is baked according to the specification.

    Submerged arc welding adopts H08AMn type welding wire with a diameter of 5mm and HJ431 type flux.

    The welds between the webs and flanges of the original coal scuttle steel beam and the hopper wall should reach the same strength level.

 

    4 rolls

    The coiling of the steel coal scuttle is completed in sections in the workshop, mainly to control the bending radius, circumference deviation and ovality of the coil. Firstly, check the correctness of the outer dimensions, bevel processing, remaining straight edges and the card template of the sheet material. Before the formal coiling, the sheet material needs to be pre-pressed. The blanking steel plate is rolled into shape on the rolling machine according to the cone arc control template calculated in advance according to the drawings. After coiling, each steel plate needs to be numbered according to the lofting drawing to facilitate post-production.