1 before using the sand mixer, check whether the transmission parts rotate flexibly, whether the support frames and beams are damaged and other hidden dangers, whether the fasteners, baffles, scrapers and plates are firm, and the gap between the scrapers and plates and the outer ring of the grinding plate shall not be greater than 100mm. All lubricating parts shall be inspected and oiled.
2 when feeding into the sand mixer, it is strictly prohibited to extend the tools used into the grinding plate. The opening and closing of the sand mixer can only be carried out by the operator, and shall not be handed over to others for operation. When the operator leaves, he shall stop the operation of the sand mixer before leaving.
3 before modeling, check whether the model meets the technical requirements and whether the lifting is safe and reliable; Whether the tools required for modeling are complete, whether the installation and connection are firm, whether the handle and lifting lug of the sand box are firm, and whether there is crack or damage. When lifting the sand box with a crane, it must be tied before lifting.
4 when using lifting machinery to open the box and lift the formwork, the rigging shall be hung flat, and the crane and trolley shall be aligned before lifting. If the sand mold needs to be repaired, the sand box shall be placed flat on the ground or shelf. It is strictly prohibited to stand under the suspended sand box to repair the mold. The stacking height of sand mold to be dried in the kiln shall not exceed 2m.
5 before closing the box, in addition to repairing the damaged part according to the process requirements, check whether the sand mold of each part is firm and whether the air hole is unobstructed. The sand box that needs to be turned over must be padded and rigged firmly to prevent it from falling off and hurting the operator during turning over. After the box is closed, the box shall be wiped with sand mud or asbestos rope to prevent fire escape during casting.
6 before smelting, check whether the furnace is intact and whether there is ice, snow, water and obstacles around the furnace; Whether the passage in the whole operation area is unobstructed and whether there are hidden dangers of hazard prevention operation such as ponding and sundries; The containers and tools used to contain molten metal must be dried and preheated. All hoisting machinery, slings and riggings must comply with the relevant provisions of this specification on the safety of hoisting machinery.
7 before feeding into the furnace, the raw materials must be carefully checked. It is forbidden to put wet raw materials, sealed containers, explosives and other sundries endangering safe operation into the furnace.
8 tools, hoppers, slings and other appliances transported into raw materials shall be checked for hidden dangers before use. After work, they shall be placed in the designated position, and shall not be thrown or pressed under the materials.
9 during smelting, excessive oxidant shall not be added, and the molten metal shall not be stirred violently. Prevent splashing and explosion accidents.
10 hollow rods shall not be used for slag raking, slag blocking and mixing. It is not allowed to insert the slag raking rods upside down or put them randomly; During automatic slag flow, it is strictly prohibited to use wet materials to cover.
11 when operating the medium frequency induction furnace:
11.1 check whether the fixed part of the furnace body is firm and whether the turnover system is flexible; Whether there will be hidden dangers such as electric shock injury to the operator during smelting operation; Whether the electrical facilities are in good condition.
11.2 before power transmission, all operators must retreat to a non hazardous area, and other personnel must stay away from the operation site. The operation of power off and transmission must be carried out by a professional electrician and directed by a specially assigned person.
11.3 when adjusting the voltage, cut off the power supply first, check whether the voltage meets the requirements when energizing, and the current shall not exceed the specified value after energizing.
11.4 during smelting, electricians shall frequently check electrical facilities to avoid other hazards caused by electrical accidents.
11.5 during tapping, the power supply must be cut off first to check whether the outlet is unobstructed. Turn over the furnace slowly and do not turn out the molten steel.
12 when operating the ironmaking furnace:
12.1 when repairing the furnace, the safety helmet must be worn, and the furnace wall shall be cooled naturally. Watering and forced cooling are strictly prohibited.
12.2 before ignition, all air holes shall be opened for ignition. During smelting, the air shall not be stopped as much as possible. If it is necessary to stop the air, the air hole must be opened first and then stopped; When opening the air, you must first open the air and then close the air hole.
12.3 the furnace shall be stable during blowing, and special attention shall be paid during slag cleaning to prevent splashing from hurting people. When starting the furnace and discharging molten iron, it shall be strictly prevented from spilling and splashing.
13 during casting operation:
13.1 the casting site and pit must be kept dry, and the tongs, sticks, hooks and other tools used must be preheated. Before casting, check whether the pressing iron of the upper and lower sand boxes is firmly pressed. Or whether it is clamped with screws; Whether the pouring riser and air passage are unobstructed.
13.2 the hot liquid metal in the ladle shall not be too full, not more than 90% of its capacity. When lifting the ladle, it must be coordinated and coordinated without deviation, reverse or sudden stop. During casting, it is not allowed to look at the riser from the front. The vent hole on the mold must be ignited to lead out the gas in the mold and mud core.
13.3 it is strictly prohibited to throw and place all casting tools and instruments used; The residual liquid metal in the ladle must be dumped at a fixed safe place. It is strictly prohibited to bury the dumped liquid metal.
14 when pouring copper castings:
14.1 it is strictly prohibited to use raw materials that are rusty, wet, greasy, and closed containers, copper pipes and explosives. Before starting the furnace, check whether the crucible is dry, whether there are cracks, and whether the slag in the furnace is cleaned. The furnace can be started only after the above preparations are made.
14.2 when igniting and drying the furnace, the fire at the initial stage shall not be too large. When the loaded copper material begins to melt, it shall be added in time. However, do not knock hard to avoid damaging the crucible. When mixing is really necessary in the smelting process, the preheated mixing rod must be used, and the operator shall stay away from the furnace fire as far as possible.
14.3 before discharging, the ladle shall be preheated to about 700 ℃, and the deoxidizer used shall also be added after preheating. When discharging copper water out of the furnace, all operators shall cooperate well to prevent copper water from flowing out and splashing.
14.4 before pouring, the ladle shall be carefully checked for hidden dangers. During pouring, the ladle shall be as close to the gate as possible, and the pit shall be poured smoothly and continuously. If the copper water splashes to a certain part of the body of the ladle holder, the party concerned shall not panic, let alone throw down the ladle at will. Someone must be replaced as soon as possible to avoid greater accidents.
14.5 pay special attention to air circulation during furnace startup to eliminate toxic smoke and dust at the work site. After pouring, the remaining copper water must be poured into the designated safe place, and burial is strictly prohibited.
15 before sand removal and casting cleaning, check whether the tools used are firmly installed and whether there are cracks and defects. If there are any of the above phenomena, they must be repaired or replaced.
16 when the casting is cleaned by sand falling, the casting shall be placed stably; When cleaning castings with hand tools, electric or pneumatic tools, it is forbidden to operate towards anyone else; When the casting is lifted or overturned by crane, the pouring and riser of iron casting shall not be hung; When turning the casting with a crowbar, the crowbar shall not be inserted into the casting hole to prevent the crowbar from slipping and rotating.
17 when using pneumatic and electric tools, it is strictly prohibited to use any part of the human body to hold the moving part or connecting part. The power supply part must be firmly connected without leakage; The operating valves and switches shall be sensitive and reliable.
18 qualified casting products and usable sand boxes shall be stacked neatly, large at the bottom and small at the top, and their height shall not exceed 1.5m. Waste and damaged sand boxes shall not be mixed with them to avoid misuse.