McLanahan Corp.’s line of Universal jaw crushers has undergone a series of design updates that have been engineered to provide a safer, simpler, and smarter customer experience starting with installation and extending to maintenance.
According to the Hollidaysburg, Pennsylvania, USA-based company, signifi- cant improvements have been made to the crushers’ stationary jaw die. The new die design has a bevel that rests in a matched groove on the lower clamp plate and is secured by upper clamp plates with a groove to match the bevel. Dies are also reversible to utilize more wear metal, improving service life. Clamp plates match both upper and lower die bevels.
For larger units such as the 64-in. model, stationary wear plates are now made of two dies with peaks in the middle and valleys on the outside. These dies can be used on the movable side if the right-side die moves to the left side to put the valley in the middle. They are lighter in weight compared with full-size dies, and are smaller and easier to store. This means producers can minimize their inventory since only one set is needed to change out either side, and the stationary side typically wears out more quickly than the movable side.
The new Universal jaw crusher design features replaceable upper and lower stationary jaw die clamp plates that are now lighter, making it easier to install, replace and secure the die. Operators no longer have to rely on heavy key-wedge or heel plate-style sideliners to lock the dies in place. Additionally, all clamp plates are interchangeable if one side or top/bottom experiences more wear.
Universal jaw crushers formerly featured long, one-piece sideliners, meaning the entire part needed replacement when a section was worn. Now, there are three cheek plates per side (top, middle and bottom). This allows liners in high-wear areas to be replaced independently of other liners.
Maintenance has been simplified by inclusion of several replaceable parts in the new jaw crusher design. The barrel liner, which protects the barrel of the pitman from rock impact and scuffing, is replaceable, as is the smash plate that absorbs impacts and wears and deforms before the crusher frame/pitman, extending the life of the frame/pitman. In order to combat pitman toe wear that can result in the need for a new pitman or extensive pitman toe rework, the new design features a bolt-in pitman toe for easy replacement.
When performing maintenance, new self-aligning locking wedges are adjusted from the rear of the crusher; this area is usually allotted the most space for maintenance, and operators don’t have to work around drive guards. Uni- versal jaw crushers are now equipped with a safety pin that will lock the pitman in a closed position when maintenance is being performed.
And, said McLanahan, these crushers are now designed with frames that are engineered to allow for “infinite possibilities” when it comes to mounting-feet design and customization. With custom feet, the crusher can be tipped forward, as well as located higher and lower or forward and backward from obstructions in an existing or new structure that would have normally made installation impossible.