Jaw Crushers are used to reduce the size of many different types of materials in many applications. The Jaw Crusher was first introduced by Eli Whitney Blake in 1858 as a double-toggle Jaw Crusher. Introduced in 1906, McLanahan’s Universal Jaw Crusher was one of the first modern era overhead eccentric Jaw Crushers. On the overhead eccentric style Jaw Crusher, the moving swing jaw is suspended on the eccentric shaft with heavy-duty double roll spherical roller bearings.Inquiry Online
The swing jaw undergoes two types of motion: one is a swing motion toward the opposite chamber side (called a stationary jaw die due to the action of a toggle plate), and the second is a vertical movement due to the rotation of the eccentric. These combined motions compress and push the material through the crushing chamber at a predetermined size.
More than 110 years of engineering and customer service experience keep customers running to McLanahan to meet their production goals. McLanahan Jaw Crushers are proudly made in the USA and have imperial designs. With our grass roots design coupled with listening to customer needs for product enhancement over the years, McLanahan offers traditional hydraulic-shim adjustment Jaw Crushers as well as H-Series Jaw Crushers that feature hydraulic discharge setting adjustment, adjust-on-the-fly chamber clearing in the event the site loses power (once power is restored) and hydraulic relief for overload events with auto-reset.
Whether the traditional hydraulic-shim adjustment or the H-Series Jaw Crushers, both machines have an aggressive nip angle that provides consistent crushing throughout the entire crushing chamber, which leads to increased production and less downtime on maintenance.
A Jaw Crusher uses compressive force for breaking material. This mechanical pressure is achieved by the crusher's two jaws dies, one of which is stationary and the other is movable. These two vertical manganese jaw dies create a V-shaped cavity called the crushing chamber, where the top of the crushing chamber is larger than the bottom. Jaw Crushers are sized by the top opening of the crushing chamber. For example, a 32 x 54 Jaw Crusher measures 32" from jaw die to jaw die at the top opening or gape opening and 54” across the width of the two jaw dies.
The narrower bottom opening of the crushing chamber is used to size the discharge material. A toggle plate and tension rods hold the pitman tight near the bottom of the moving swing jaw. The toggle plate is designed to perform like a fuse and protect the crusher in the event that an uncrushable material enters the crushing chamber. As a rule, Jaw Crushers have a 6:1 or 8:1 ratio for crushing material. Still using the 32 x 54 Jaw Crusher example, the top size of the feed entering the crushing chamber has to follow the F80 rule that 80% of the top size feed material is smaller than the gape opening. Using the F80 rule with the 32 x 54 Jaw Crusher, the 32” gape opening equals a 26” top sized feed, and with the 6:1 ratio of reduction, the discharge setting would be around 4”
Since the crushing of the material is not performed in one stroke of the eccentric shaft, massive weighted flywheels are attached to the eccentric shaft and powered by a motor. The flywheels transfer the inertia required to crush the material until it passes the discharge opening.
While Jaw Crushers are mostly used as the first stage of material reduction in systems that may use several crushers to complete the circuit, the Jaw Crusher has also been used as a second-stage crushing unit. Depending on the application requirements, Jaw Crushers can be used in stationary, wheeled portable and track-mounted locations. The Jaw Crusher is well suited for a variety of applications, including rock quarries, sand and gravel, mining, construction and demolition recycling, construction aggregates, road and railway construction, metallurgy, water conservancy and chemical industry
F100 is the maximum gape opening on a Jaw Crusher. F80 is the feed size to the Jaw Crusher, calculated by taking 80 times the gape opening divided by 100. P80 is the percent passing the closed side setting in tph.
A best practice, if possible, is to blend the material arriving from the source. This will ensure a constant and well-graded feed to the crushing chamber. In turn, this will produce a steady rate of tph and promote inter-particle crushing that helps break any flat or elongated material. It also aids in equal work hardening the manganese jaw dies and prolonging the life of the jaw dies.
Usually a Jaw Crusher is in an open circuit, but it can be used in a close circuit if the return load is not greater than 20% of the total feed and the raw feed is free of fines smaller than the closed side setting
Efficiency can be defined by the ratio of the work done by a machine to the energy supplied to it. To apply what this means to your crusher, in your reduction process you are producing exactly the sizes your market is demanding. In the past, quarries produced a range of single-size aggregate products up to 40 mm in size. However, the trend for highly specified aggregate has meant that products have become increasingly finer. Currently, many quarries do not produce significant quantities of aggregate coarser than 20 mm; it is not unusual for material coarser than 10 mm to be stockpiled for further crushing
Sandvik jaw crushers are of the single-toggle type with advanced features for optimized performance, easy maintenance, long life and a low cost per ton. These crushers feature a deep, symmetrical crushing chamber, easy settings adjustment, a large feed opening for its size, and an ideal nip angle that offers smooth material flow and high reduction efficiency. We have been designing jaw crushers in close cooperation with our customers for many years, and we know exactly what you need in order to boost your productivity
Sites of all kinds come with their own unique challenges, so it is important to choose jaw crushers that match your needs. From years of experience, research, and customer feedback, Sandvik has manufactured a range of equipment to suit you, whatever the application
For increased flexibility our jaw crusher series has models that are also suited to mobile applications, with increased strength and lower weights, such as the Sandvik QJ341 and Sandvik QJ241 mobile jaw crushers
Getting the right end product is vital, and our stationary jaw crushers are built to allow you to achieve the right outcome every time. Versatility comes as standard, with a jaw crusher range suitable for many different applications within quarrying and mining segments. Our equipment has been tried and tested across the world, and is designed with a focus on improving reliability and efficiency giving you higher overall productivity rates
Sandvik's range of jaw crushers is designed to offer you the highest possible capacity and lowest cost per ton. All of our jaw crushers are of the single toggle type, with a deep, symmetrical crushing chamber and easy setting adjustment to make your crushing process easier. Whether you're looking for a heavy duty jaw crusher suitable for tough applications, or a sturdy crusher for stationary installations, we deliver
Ensuring our products are safe and easy to operate as well as being easy for you to maintain is essential in order to guarantee optimal output and efficiency. Sandvik jaw crushers are built on well proven technology to offer you the highest possible reliability and performance, whilst prioritizing operator safety
From years of research and experience in the field, we understand the many challenges that you face. This means we can make sure all of our products ensure that risk is minimized, which allows your operations to run smoothly. We are strongly committed to providing you with equipment that has a long working life, so you can continue to work efficiently and keep productivity high. If you have any questions regarding our stationary jaw crushers please contact a member of our team
Over the last 150 years, we’ve learned a thing or two about crushing and screening. As innovators and experts in the field, we have a deep understanding of technical and mechanical factors, but there’s more to it than that. Find out more at our knowledge hub for crushing and screening
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