After the steam engine and the electric motor power machinery such as the gradual improvement and promotion of modern mechanical crushers have been created. In 1806, a roller crusher driven by a steam engine was invented; in 1858, EWBlake of the United States created a jaw crusher for broken rock; in 1878, a gyratory crusher with continuous crushing action appeared in the United States, and its production efficiency was much higher than that. Jaw crusher for intermittent crushing operations; in 1895, William of the United States invented a lower impact crusher. In the 1980s, a large jaw crusher capable of crushing 800 tons of material per hour had a feed size of 1800 mm. Commonly used jaw crushers are available in double brackets and single brackets. The former is only a simple circular arc swing during work, so it is also called a simple pendulum type jaw crusher; the latter also performs up and down movement while making an arc swing, called a compound pendulum jaw crusher. The technical level of domestic jaw crusher design and manufacture manufacturers is quite different from the world level. There are many unreasonable examples of the design of the domestic jaw crusher frame structure. The reason is that the frame is not designed and manufactured according to the actual force of the crusher. In recent years, with more and more open pit mining, as well as the promotion and utilization of large machinery (excavators) and large mining vehicles, the ore mass of open pit mines to the crushing workshop has reached 1.5-2.0 meters. original ore grade decreased, in order to maintain or even improve the beneficiation plant production capacity, have greatly increased the amount of ore mined and crushed raw ore, to obtain advantage quantified. Therefore, the jaw crusher is moving in a large direction. With the emergence of impact-resistant large-sized rolling bearings, there is a tendency to use a double-swing jaw crusher instead of a simple pendulum jaw crusher at home and abroad. This is because the former has a 30% increase in production capacity compared to the latter; When the two production capacities are the same, the former is 20%-30% lighter than the latter. However, there are still some difficulties in the structure of the compound pendulum jaw crusher, which has yet to be studied and improved. It should be noted that in recent years, due to the continuous improvement of the material of large-scale rolling bearings in China and the development of the underground coarse crushing program, the compound pendulum jaw crusher also has a tendency to develop in a large direction. With the large-scale equipment specifications, the general type The adjustment device and the safety device of the crusher must adopt a safer mechanism. Therefore, another trend in the development of the jaw crusher is that the size of the discharge port is hydraulically adjusted, which is not only simple and quick, but also can change the size of the discharge port at any time during the work; at the same time, the overload of the machine The safety device is also equipped with a hydraulic mechanism to achieve safety and reliability, and does not damage the equipment. After the fault is removed, the machine resumes work immediately, saving a lot of manpower and material resources. This type of hydraulic jaw crusher is being developed at home and abroad. China has produced 900 × 1200 hydraulic jaw crusher, and production in Laiwu iron ore and iron ore processing plant roots. The production practice proves that the hydraulic safety device and adjusting device of the hydraulic jaw crusher have achieved the purpose of safety insurance and convenient adjustment, and are easy to use, and will exert great advantages in the crushing process. According to statistics, every year mining, building materials and non-metallic mineral products processing accounted for about 11% of the country's total energy consumption, 17% of the country's industrial energy consumption, and most of the energy to heat energy at work and other sources of energy is wasted In addition, grinding operations also consume a lot of materials such as steel. The demand for broken materials is increasing, the lean ore and waste are continuously recycled, and the requirements for energy saving and emission reduction are becoming more and more urgent. Therefore, the development of efficient crushing equipment meets the requirements of the times and progress. Nowadays, countries are constantly researching and transforming equipment to develop more automated and modern equipment. Therefore, combined with the current facts and the theory of fracture theory, the development direction of crushing equipment is roughly as follows: 1. More large-scale. The integration of mineral resources and the tendency of mining companies to become large-scale have led to the large-scale development of equipment. The large-scale equipment is conducive to the improvement of production capacity, cost reduction and energy conservation. 2. Simple structure The equipment is lighter and more environmentally friendly. Mine noise pollution is often the main part of mine pollution, and the equipment is lighter and can also reduce noise pollution, which can simplify the structure of the equipment and facilitate maintenance. 3. Be more intelligent and automated. Since the 21st century, energy efficiency has developed into the mainstream requirement of economic development. With the development of science and technology, life and industry tend to combine with electronic information to achieve higher work efficiency and save manpower and material resources. The development of sensing technology, control technology and mechatronics has effectively promoted the automation of the crushing equipment. 4. More standardization and more uniform standards. This makes the production, maintenance and design of the equipment more economical. The uniform standard makes the equipment accessories universal and is the only way for the development of engineering machinery. In addition, the handling of equipment problems and the development of parts are also more convenient. 5. More humane. In a people-oriented society, the environment in which people live, the environment in which they work, and safety are particularly important. In the design of mechanical products, the safety of workers must also be considered. 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Development and direction of jaw crusher