Determination of construction plan Meishan Equipment Company immediately after receiving the entrustment of Mei Steel Ironworks, immediately organized the relevant technical personnel to prepare the construction plan, select the appropriate opening and grouting equipment, and formulate specific construction methods. Determine the use of each blast furnace off wind for the blast furnace high pressure grouting construction, in each blast furnace planned off wind, according to the actual situation of the blast furnace to properly loosen the edge of the airflow, and infrared temperature gun to furnace temperature measurement , Looking for a relatively high part of the furnace skin temperature or a higher temperature of the cooling wall, that is, the weakest part of the lining, according to the lining erosion status to develop the number of grouting holes and the amount of each hole intrusion. Construction method The construction machinery was prepared using a special grouting pump manufactured by Japan for blast furnace overhaul and injecting carbon material. The pump adopts a squeezing type structure with an output pressure of 3.0 MPa, an output flow rate of 30 L/min, and a motor power of 5.5 kW. Operating temperature 90-110°. Before the construction, the grouting machine was transported to the construction site for maintenance and electricity commissioning. Press-in holes and grooving holes Cleaning holes and cutting holes According to the temperature measurement results of the blast furnace shaft with an infrared thermometer before each off-wind, select the opening point on the blast furnace hearth and make a mark. The new hole-opening method is a mechanical hole-opening method. German-made DN450 type iron-absorbing drill drills holes with a diameter of 304mm and a depth of 300-400mm directly on the furnace skin. For some special locations, the drill can not be drilled, then the artificial opening method is adopted. Cut the hole with a diameter of 30-40mm on the furnace skin with a cutting knife, and then drill with a percussion drill. The old grouting hole cuts the original grouted hole short grouting pipe to the root, and drills deep into the depth of 300-400mm with a percussion drill and then clears the hole. Holes were drilled with a percussion drill after the hole was drilled. Red coke was observed when the hole was clear. Red coke was still not seen when the hole depth exceeded 400 mm, and the hole cleaning operation was stopped. After the welding grouting short tube is cleaned up, the grouting short tube is welded again, the stop valve on the grouting tube is installed, and then the shaft-connecting joint is connected with the grouting machine. It is strictly forbidden to weld the grouting pipe and clear the hole. The squeezing operation of the stirring mixer shall be run for 510 minutes. After confirming that the working conditions are normal, according to the requirements of the supplier: Mixing the slurry powder and the slurry binder at a slow speed of 41 parts, uniformly pour into the mixer for stirring, and stir for 610 minutes. During the process, depending on the degree of mixing, the mixing time is increased and the amount of the binding agent is increased to reduce the concentration of the slurry, and to prevent blocking of the slurry during grouting, and pouring into the hopper of the squeezing machine. Although the grouting technology has been widely used in the field of construction engineering, it has not been widely used in the metallurgical industry, especially for the furnace lining of blast furnaces. At present, as one of the daily maintenance methods for blast furnace longevity, the success of this technology The improvement of blast furnace gas conditions in No. 1 and No. 3 blast furnaces at Meishan Iron & Steel Works has improved the utilization rate of blast furnace gas, reduced the consumption of fuel, increased the intensity of blast furnace smelting, ensured the long-term stable operation of the blast furnace, and realized the high output and quality of the blast furnace. , low consumption and longevity. The blast furnace pressure injection non-slurry lining is non-rigid lining material. Due to the pressure limit of the grouting machine, the actual slurry concentration cannot reach the technical requirements of the pressure slurry supplier, and the grouting task is completed by diluting the concentration of the pressure slurry. High pressure injection grouting press can be used. Automobile Bearing ,Bearings For Cars,Bearings Auto,Bearing Automobile NINGBO DEMY (D&M) BEARINGS CO.,LTD , https://www.demybmtbearing.com