Short circuit is terrible and may cause fire. It is necessary to regularly check whether the line is loose or twisted. Before and after each work, check whether there are loose or broken cables or wires.
During the operation of the excavator for removing inflammables, it is inevitable to spill a lot of fuel or other garbage, or sundries accumulated over time. If these things are not cleaned for a long time, they are likely to cause fire under specific conditions. Therefore, it is necessary to clean them regularly.
Pipelines conveying flammable liquids shall be specially protected. Pipelines conveying flammable liquids shall be thoroughly cleaned before operation during welding or cutting.
During normal use, the pipeline transporting combustible liquid must be kept away from the heat source. Maintenance of the storage battery: the electrolyte of the storage battery is toxic. If it explodes, it will cause serious losses to people. Therefore, the fire source must be kept away from the storage battery, and the storage battery shall be inspected regularly.
Maintenance of air conditioning system: if the frozen liquid of air conditioning refrigeration is stained on the skin, it will produce frostbite effect. During the maintenance, you must pay special attention to avoid the Freon steam from contacting the skin. Today, I share with you the precautions for daily maintenance of excavator. If you have any questions, please contact 100% excavator maintenance.
Analyze and check the reason before repairing:.
1. Causes of cracks
Reasons for cracks on the side plate of the excavator boom: there are bubbles, slag inclusions and small cracks in the original weld. When the excavator is overloaded, small cracks will be generated at the original weld for repair by the micro excavator and gradually expand; cracks will be generated due to the Inconformity between the welding rod and the plate during welding; due to the large volume of the excavator boom, it is difficult to take reliable and effective heating and insulation measures, and the hardening zone of the base metal around the weld cannot be completely removed after welding, Resulting in the decrease of weld strength: during the operation of excavator, the vibration and impact are large, and the uneven stress at the weld makes the weld crack.
2. Repair method
Preparation before welding: clean the oil stain, paint, rust, etc. at the original weld crack with hand grinding wheel, cut the weld crack with an air planer to the body of the side plate, and remove the hardened area of the base metal previously welded. After cutting, grind the notch with an angle grinding wheel (V-shaped groove is polished at the inner interface), clean it, and after pink inspection, the excavator repair shop confirms that all the cracks have been found and removed.
According to the existing maintenance conditions, select Φ The 5mm model E5015 (J507) or E5016 (j506) welding rod shall be baked at 350 ℃ for 2h, and then kept at 100 ℃ to prevent moisture absorption of the welding rod. The welding current is 190-230a. Due to the large thickness of the side plate of the excavator, the welding part shall be preheated to 150-250 ℃ before welding. During the welding process, the segmented, symmetrical and backward welding method can be used. During the cooling process of the welding seam, the welding metal shall be continuously knocked with a hammer, In order to eliminate the stress, when welding at the corner of the side plate, in order to avoid arc starting and falling defects, continuous welding should be conducted to improve the stress condition of the connection.
