The reversible impact crusher, also known as the reversible hammer mill, is a type of impact crusher that allows the rotor to rotate in both directions, enabling it to be used for both primary and secondary crushing. The history of the reversible impact crusher can be traced back to the early 20th century.
The earliest reversible impact crushers were invented and patented by Andreas L. Andreasen, a Danish engineer, in 1919. The crusher featured a hammer rotor with hinged hammers that could swing freely in either direction. This allowed the crusher to handle both primary and secondary crushing tasks by reversing the direction of the rotor. However, these early reversible impact crushers were relatively large and heavy, and they were primarily used in the cement industry for crushing clinker.
In the following decades, various improvements were made to the design and functionality of reversible impact crushers. For example, in the 1930s, the Pennsylvania Crusher Company introduced a reversible hammer mill with adjustable breaker plates and multiple crushing chambers, which further improved its versatility and efficiency. Over time, reversible impact crushers became more widely used in other industries, such as mining, quarrying, and construction, due to their ability to handle a wide range of materials and produce different product sizes.
In recent years, advancements in technology and engineering have led to further improvements in the design and performance of reversible impact crushers. For example, modern reversible impact crushers may feature advanced rotor designs, improved wear-resistant materials, hydraulic adjustment systems, and other innovations to enhance their efficiency, reliability, and ease of maintenance.
Today, reversible impact crushers are widely used in various industries for primary and secondary crushing of materials such as limestone, coal, gypsum, gravel, and more. They are known for their versatility, allowing operators to adjust the crusher settings to produce different product sizes and meet specific application requirements. The reversible impact crusher has a long history of evolution and continues to be an important crushing equipment in the modern aggregate and mining industries.
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