The loader's digging and loading and unloading operations are realized through the movement of its working device. The working device of the loader is composed of a bucket 1, a boom 2, a connecting rod 3, a rocker 4 and a bucket cylinder 5, a boom cylinder 6, and the like. The entire working device is hinged on the frame 7. The bucket is hinged to the bucket cylinder via a connecting rod and a swing arm for loading and unloading materials. The boom is hinged to the frame and boom cylinder for lifting the bucket. The bucket is flipped and the boom is raised and lowered hydraulically.
The working device of the loader should ensure that: when the bucket cylinder is locked, and the boom cylinder is raised or lowered, the linkage mechanism makes the bucket move up or down, so as to prevent the bucket from tilting and spilling materials; When the arm is in any position and the bucket is rotated about the hinge point of the movable arm for discharging, the bucket tilt angle is not less than 45 °, and the bucket can be automatically leveled when the boom is lowered after discharging. Based on the structural types of loader working devices at home and abroad, there are mainly seven types, which are divided into three-bar, four-bar, five-bar, six-bar, and eight-bar, etc. according to the number of components of the link mechanism. According to whether the steering of the input and output levers are the same, they are divided into forward rotation and reverse rotation linkage mechanisms. Loader bucket structure for earthworks. The bucket body is usually welded with low-carbon, wear-resistant and high-strength steel plates. The cutting edges are made of wear-resistant medium-manganese alloy steel. Made of ground steel. There are four types of bucket cutters. Tooth profile selection should consider factors such as insertion resistance, abrasion resistance and ease of replacement. Tooth-shaped points and blunt teeth, tire loaders mostly use sharp teeth, while track-mounted installations mostly use blunt teeth. The number of bucket teeth depends on the bucket width, and the bucket tooth pitch is generally 150-300mm. The structure of the bucket teeth is divided into two types: the integral type and the split type. Most of the small and medium loaders adopt the integral type, and the large loaders often use the split type because of poor operating conditions and serious tooth wear. Split bucket teeth are divided into two parts: basic tooth 2 and tooth tip 1. After wear, only the tooth tip needs to be replaced.