How does the jaw crusher achieve insurance and discharge adjustment?

September 02, 2023

Jaw crusher thrust plate ( also known as the bracket ) , in addition to transmitting power to make the moving plate to swing back and forth, but also has a safety insurance function, changing its length can also play a role in regulating the discharge port.

When the jaw crusher enters the unbreakable material ( such as iron balls, iron blocks, etc. ) in the crushing chamber , the back thrust plate is used as the safety component of the crusher to protect the main components of the equipment from damage. The back thrust plate is generally cast into a whole with cast iron, and a groove or a plurality of small holes are opened in the middle portion to reduce the sectional strength thereof; or two pieces can be cast, and then connected by screws ( or rivets ) to form a combined thrust plate. When the unbreakable material enters the crushing chamber, the equipment is overloaded, and the huge crushing force is transmitted to the thrust plate, causing the thrust plate to be broken or the screw of the combined thrust plate to be cut, and the machine stops working and plays an insurance role.
As the tooth plate continues to wear, the discharge port becomes larger and the product becomes thicker. In order to obtain a qualified product size, the size of the discharge port needs to be adjusted periodically. There are two main methods for adjusting the discharge port:
(1) Gasket adjustment, that is, a set of gaskets is placed between the backrest of the backrest plate and the rear wall of the frame to increase or decrease the number of gaskets or change the thickness thereof, so as to adjust the discharge port. The method is compact in structure and reliable in regulation, and the large and medium-sized jaw crusher often uses this adjustment method.
(2) Wedge adjustment is to adjust the two wedges placed between the rear seat of the thrust plate and the frame, which is suitable for small crushers.
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