The impact crusher is also called counter-breaking. It can handle heavy materials with a side length of 100-500 mm. Its compressive strength can reach 350 MPa, which has the advantages of large crushing ratio and cubic material after crushing. The equipment is small in size, simple in structure, large in crushing ratio, low in energy consumption, large in production capacity, uniform in particle size and selective in crushing, and is a promising equipment. . In the crushing process of the Zenith Crusher, the plate hammer, which is a key vulnerable component, is prone to severe wear, thereby reducing the service life of the hammer and the working efficiency of the crusher. The following is a detailed analysis and introduction of the causes and treatment measures of plate hammer wear.
The cause of the failure: the hammer wear is the main failure mode of the impact crusher. Generally, the hammer has a short service life and a large consumption. It requires a large number of spare parts to maintain normal production and high production cost. There are generally two reasons for the short life of the hammer: First, the material of the hammer is not properly selected. The plate hammer material is often made of high manganese steel. The high manganese steel is characterized by good toughness, high strength and good maneuverability. Under the action of large impact or contact stress, the surface layer of high manganese steel will rapidly produce severe work hardening, greatly Improve surface hardness and wear resistance. However, in actual use, the impact force or contact stress is often insufficient, and the surface cannot be rapidly hardened by work hardening, and the wear resistance cannot be fully exerted. Second, the hammer structure is not properly selected. There are many forms of hammers, and the working faces are wide and narrow. The wide and effective wear is large. There are single-head work and double-head work. There are single-sided work and double-sided work. There is only one wear on the single head. The face has two wear faces on both sides, and the two sides have four wear faces on both sides. Under the same conditions of materials, the plate hammer with large effective wear and wear surface has long service life.
Treatment measures: to improve the service life of the hammer, from the scientific selection of the material of the hammer and the structure of the optimized hammer. In order to improve the service life of the hammer, the hammer should select some materials with better wear resistance, such as high chromium cast iron and low carbon alloy steel. High-chromium cast iron is a material with excellent anti-wear properties, and its wear resistance is stronger than that of high-manganese steel. The disadvantage is that the toughness is low. In the case of large impact, brittle fracture is easy to occur. In order to improve the strength of the hammer and reduce the cost, a layer of high chromium cast iron can be welded on the high manganese steel plate to achieve wear resistance. Low-carbon alloy steel is mainly alloy structural steel containing various elements such as chromium and molybdenum. It has high hardness and good toughness. Under the same working conditions, its service life is at least doubled than that of high manganese steel hammer, but quenching and tempering. The heat treatment process is the key. In the structure selection of the hammer, under the conditions of the process conditions, the structure of the wide and thick working face and the double-headed double-sided hammer is selected, which can greatly improve the service life of the hammer.
The cause of the failure: the hammer wear is the main failure mode of the impact crusher. Generally, the hammer has a short service life and a large consumption. It requires a large number of spare parts to maintain normal production and high production cost. There are generally two reasons for the short life of the hammer: First, the material of the hammer is not properly selected. The plate hammer material is often made of high manganese steel. The high manganese steel is characterized by good toughness, high strength and good maneuverability. Under the action of large impact or contact stress, the surface layer of high manganese steel will rapidly produce severe work hardening, greatly Improve surface hardness and wear resistance. However, in actual use, the impact force or contact stress is often insufficient, and the surface cannot be rapidly hardened by work hardening, and the wear resistance cannot be fully exerted. Second, the hammer structure is not properly selected. There are many forms of hammers, and the working faces are wide and narrow. The wide and effective wear is large. There are single-head work and double-head work. There are single-sided work and double-sided work. There is only one wear on the single head. The face has two wear faces on both sides, and the two sides have four wear faces on both sides. Under the same conditions of materials, the plate hammer with large effective wear and wear surface has long service life.
Treatment measures: to improve the service life of the hammer, from the scientific selection of the material of the hammer and the structure of the optimized hammer. In order to improve the service life of the hammer, the hammer should select some materials with better wear resistance, such as high chromium cast iron and low carbon alloy steel. High-chromium cast iron is a material with excellent anti-wear properties, and its wear resistance is stronger than that of high-manganese steel. The disadvantage is that the toughness is low. In the case of large impact, brittle fracture is easy to occur. In order to improve the strength of the hammer and reduce the cost, a layer of high chromium cast iron can be welded on the high manganese steel plate to achieve wear resistance. Low-carbon alloy steel is mainly alloy structural steel containing various elements such as chromium and molybdenum. It has high hardness and good toughness. Under the same working conditions, its service life is at least doubled than that of high manganese steel hammer, but quenching and tempering. The heat treatment process is the key. In the structure selection of the hammer, under the conditions of the process conditions, the structure of the wide and thick working face and the double-headed double-sided hammer is selected, which can greatly improve the service life of the hammer.