During the operation of the jaw crusher, the various parts of the crusher are often worn under the friction, and the parts that are in direct contact with the broken material are vulnerable to greater wear, and the exposed parts that are vulnerable to wear include the crushing plate and the side wedge plate.
The factors affecting the wear degree and damage of the crusher parts are as follows, the structure and working nature of each component, so the physical and mechanical characteristics of the broken gravel, the quality of the material for a certain part, the working time, and the operating conditions (the correctness of the installation, the continuity of the lubrication of the friction parts, the compliance with the work system and the repair work on schedule). This is because the service life of the worn parts of the crusher is very different.
The normal operation of a component or part and the degree of wear are often determined by means of appearance inspection or unremoved part measurement and observation of the working condition of the part.
In all kinds of wear of the crusher, mainly mechanical wear occurs.
The main working part of the crusher to break the gravel is the crushing plate (jaw plate), which is subjected to greater wear. The broken plate is prone to greater wear and tear, so it needs to be replaced regularly. Experience has shown that the fixed crushing plate wears faster than the movable crushing plate, 20% faster in the crusher with single moving jaw plate, and 30-40% faster in the crusher with double moving jaw plate. In order to increase the service life of the crushing board and prevent its damage, it is necessary to pad the groove of the crushing board with lead plate, zinc plate, asbestos plate, sulfur and other plastics or poured cement slurry.
Ground broken plates made of manganese steel or carbon wire are repaired with Stalin alloy or by making welding rods.
The rust and dirt in the welding part of the jaw plate of the crusher should be completely removed. If the worn part is not only the rib edge, but also the groove of the jaw plate, the groove should first be levelled with the um-7 or m33-04 welding rod (but not with the powder welding rod) and the bottom of the rib edge.
The welding of grooves can be accelerated by adding wire to the arc welding or by welding with a bundle of electrodes.
The welding repair time can adopt the flat strip of i-iv charging; The best results can be obtained in the flat bar elbow with ⅱ and i supplements, but only m=50%; And no more than 53%.
Welding of grooves is performed by arc welding of alternating current or direct current with um-7 or m33-04 electrode. When using direct current, the negative electrode should be connected to the jaw crusher.
In order to ensure the strength of the repair layer, and to prevent the welding patch from falling off the base metal, the first layer is welded with a metal electrode permanently coated with Stalin alloy. The second layer and all the following layers until the tooth is completely repaired are welded with a mixed layer:
The first layer is welded with a gold layer electrode, while the remaining three layers are welded with a mixed layer. After welding each mixed layer, the fracture is placed on the flank to make the inverted surface of the tooth star level. A layer of borax is spread over the finished side surface, and then a layer of Stalin alloy mixture, 3.5-4 mm thick, is spread over the borax layer and surfacing with carbon electrodes. A total of two layers of Stalin alloy were welded, each layer 1.5 mm thick. Welding the hollow steel rod to the worn broken board by electric welding can increase the service life of the broken board by 15-25%.
If a broken plate made of low carbon steel is used and a replaceable furrowed plate made of manganese steel is welded on the bottom plate, the worn furrowed plate can be repaired by regular replacement.
The repair procedure is as follows. Firstly, the lower surface of the rib edge and the crushing plate are marched artificially on a rough grinding machine to make the rib edge fit closely with the bottom plate of the crushing plate. 3-4 rows of rib edges should be installed along the full length of the jaw plate, so that it is not necessary to replace all the cover layer, as long as the wear part of the rib edge can be replaced.以上翻译结果来自有道神经网络翻译（YNMT）· 通用场景
