低成本、率、以工作质量保证产品质量

　　I. Maintenance of Chains and Pulleys

　　1.链片不得有裂纹和变形，需转动灵敏（每20节链节伸长不超越规则值8mm,链条销子的磨损不得超越原直径5%)，不得有严重弯曲、疲倦裂纹和锈蚀。如超越允许状况时，应改换。

　　1. No cracks and deformations are allowed in the chains, and the chains need to be rotated sensitively (the elongation of every 20 chains does not exceed the regular value of 8 mm, and the wear of the chain pins does not exceed the original diameter of 5%). No serious bending, fatigue cracks and rust are allowed. If the situation is beyond permission, it should be changed.

　　2.若滑轮外表呈现不平均磨损，两滑轮外径差大于0.2mm，滑轮外表呈现台阶或压痕，影响链条正常运转时，应予以改换。

　　2. If the pulley surface shows uneven wear and tear, the difference of outer diameter between the two pulleys is greater than 0.2 mm, and the pulley surface shows steps or indentations, which affect the normal operation of the chain, it should be replaced.

　　二、主、侧滚轮的检修

　　II. Maintenance of Main and Side Rollers

　　主、侧滚轮磨损痕迹应平均，其磨损限度沿方向，主滚轮为1.0mm,侧滚轮为0.5mm，否则应改换。

　　The wear marks of the main and side rollers should be averaged. The wear limit of the main rollers should be 1.0mm and the side rollers should be 0.5mm. Otherwise, they should be replaced.

　　三、内、外门架的检修

　　III. Inspection and Repair of Inner and Outer Portal Frames

　　1.门架变形的修理

　　1. Repair of Gate Frame Deformation

　　①内、外门架请求平直，在全长内不直线度不得超越1mm，运用限度3mm;否则应修复。

　　The inner and outer portal frames are required to be straight. The non-straightness in the whole length should not exceed 1 mm and the application limit should be 3 mm. Otherwise, they should be repaired.

　　②用磁力探伤、敲击法检查有无裂纹、变形或扭曲。如有，应修复。

　　(2) Use magnetic flaw detection and percussion method to check whether there are cracks, deformations or distortions. If so, it should be repaired.

　　③当弯曲和扭曲变形较小时，允许用加静载荷的冷校正法校正。当弯曲变形在全长范围内超越1.5mm、横向宽度差超越1.5mm或内门架顶板弯曲变形超越2.0mm时，应矫正。

　　(3) When the bending and twisting deformations are small, the cold correction method with static load is allowed. When the bending deformation exceeds 1.5mm in the whole length range, 1.5mm in the transverse width difference or 2.0mm in the bending deformation of the roof of the inner portal frame, it should be corrected.

　　④内、外门架的部分变形或凸凹处，允许火焰校正。当弯曲、扭曲变形过大，用冷压不易校正时，可加热校正。加热时应尽量减少加热区域，将其温度控制在700?800度，并迟缓冷却，以免增大脆性。当整体变形、锈蚀严重、导轨里口尺寸超越磨损限度时，应报废。

　　(4) Partial deformations or concave and convex parts of the inner and outer portal frames shall be allowed to be corrected by flame. When the bending and twisting deformations are too large to be corrected by cold pressure, they can be corrected by heating. When heating, the heating area should be minimized, the temperature should be controlled at 700? 800 degrees, and the temperature should be slowly cooled to avoid increasing brittleness. When the overall deformation, serious rust, guide rail inner size beyond the wear limit, should be scrapped.

　　⑤内、外门架内侧面导轨每边磨损达2mm时，应改换导轨或修整后运用。

　　_When wear and tear of inner and outer gantry guide rails reaches 2 mm on each side, the guide rails should be replaced or repaired and used.

　　2.叉车门架裂纹的修理：在检验中如发现有裂纹，应停止修理。

　　2. Crack repair of forklift door frame: If cracks are found in inspection, repair should be stopped.

　　①修理前应停止叉车门架的校正，坚持门架的固有直度。

　　Before repairing, the correction of forklift gantry frame should be stopped and the inherent straightness of gantry frame should be adhered to.

　　②打磨裂痕处，直显露金属光泽，然后认真检查，肯定裂纹界线。在界线延伸10mm处钻令5?的限止孔。

　　(2) Grind the cracks until they show metallic luster, and then check carefully to confirm the crack boundary. Drill 5? Stop hole at 10 mm extension of the boundary.

　　③在裂口处用砂轮等修磨出焊道坡口。

　　(3) grinding the groove with grinding wheel at the crack.

　　④停止填焊时，用直流反极性电弧焊。电弧应尽可能短，焊条直径为4mm,电流约为210?240A。焊接时焊条应倾向运动方向20°?30°。填焊工作自钻透孔开端直裂纹另一端，并在背面也停止焊补，焊缝高度应不超越基体平面1?2mm。焊接时环境温度应在0度以上。

　　When stopping filling welding, DC reverse polarity arc welding is used. The arc should be as short as possible. The diameter of the electrode is 4 mm and the current is about 210?240A. When welding, the welding rod should be inclined to the moving direction of 20? 30. The filling and welding work shall be from the beginning of the drilling hole to the other end of the crack, and stop the filling on the back side. The height of the weld shall not exceed 1?2 mm of the base plane. The ambient temperature should be above 0 degrees during welding.