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1984年我矿引进了美制二手设备2100BL挖掘机4台。该设备与370电动轮汽车配套使用,每年可完成我矿采剥总量的三分之一左右。 1.挖掘机动臂概况 2100BL挖掘机的动臂采用等强度箱形结构,如图1,臂长13.521米,宽3.48米,高2.053米,重25.5吨。动臂跟1的工作面为曲面,如图2,在挖掘机工作时承受着强烈的冲击载荷,工况恶劣。推压大轴轴承座4采用结构件,由动臂侧板、减速箱臂板等支承。推压大轴轴承座是动臂的最关键部位,往往由于它的损坏难以修复而导致动臂报废。推压大轴轴承座的A-A剖面见图3,B-B剖面见图4。焊在动臂两侧的为铲杆滑道5。动臂体2是由含锰1.6～1.8％的钢板焊接而成。钢板的厚度为25.4～38.1mm。在检查动臂内部结构时发现了焊口粘贴着没有用尽的空心焊条,这说明美制动臂采用了自动焊工艺。
In 1984, we imported 4 sets of 2100BL excavators for American second-hand equipment. The equipment and supporting the use of electric wheel car, each year to complete the mine about 1/3 of the total amount of mining. 1. Excavator boom Overview 2100BL excavator boom with equal strength box-shaped structure, shown in Figure 1, arm length 13.521 meters, 3.48 meters wide, 2.053 meters high, weighing 25.5 tons. The working surface of the boom and the one is a curved surface, as shown in FIG. 2, which is subjected to a strong impact load while working in the excavator and is in a bad working condition. Pushing the large-diameter bearing seat 4 using the structure, by the boom side plate, gear box arm support. Push the large-diameter bearing seat is the most critical part of the boom, often because of its damage is difficult to repair and lead to boom scrapped. The A-A section of the large-diameter bearing is shown in Figure 3 and the section B-B is shown in Figure 4. Welding in the boom on both sides of the shovel bar slide 5. The boom body 2 is formed by welding a 1.6-1.8% manganese steel plate. The thickness of the steel plate is 25.4 ~ 38.1mm. When checking the internal structure of the boom, it was found that the weld bead adhered to the unexposed hollow electrode, which indicated that the US brakes used the automatic welding process.