The shovel digging and material loading and unloading operations of the loader are realized through the movement of its working device. The loader working device is composed of bucket 1, boom 2, connecting rod 3, rocker arm 4, rotating bucket cylinder 5, boom cylinder 6, etc. The whole working device is hinged on frame 7. The bucket is hinged with the rotary bucket cylinder through the connecting rod and the rocker arm for loading and unloading materials. The boom is hinged with the frame and the boom cylinder to lift the bucket. The turnover of the bucket and the lifting of the boom are hydraulically controlled.

 When the boom is in any position and the bucket rotates around the hinge point of the boom for unloading, the tilt Angle of the bucket is not less than 45°, and the bucket can be automatically levelled when the boom drops after unloading. Based on the structural type of the loader working device at home and abroad, there are seven main types, namely, according to the number of members of the connecting rod mechanism, it is divided into three-bar, four-bar, five-bar, six-bar and eight-bar, etc. According to whether the steering of the input and output rods is the same, it is divided into positive and reverse connecting rod mechanisms. Loader bucket structure for earthmoving engineering, the bucket body is commonly made of low-carbon, wear-resistant, high-strength steel plate welding, cutting edge is made of wear-resistant manganese alloy steel material, side cutting edge and reinforced Angle plate are made of high-strength wear-resistant steel material. The shape of the bucket cutter is divided into four types. The selection of tooth shape should consider insertion resistance, wear resistance and easy replacement. The tooth shape is divided into sharp teeth and blunt teeth. The wheeled loader mostly uses sharp teeth, and the tracked loader mostly uses blunt teeth. The number of teeth depends on the width of the bucket, and the tooth distance is generally 150-300mm. The bucket tooth structure is divided into two types, small and medium-sized loaders mostly use the whole, and large loaders often use the split type due to poor working conditions and serious wear of the bucket teeth. Split bucket teeth are divided into two parts: basic tooth 2 and tooth tip 1, and only need to replace the tooth tip after wear.