The jaw crusher toggle plate is a precisely calculated cast iron component used to adjust the discharge opening size and compensate for wear between the jaw plates, toggle plate, and toggle seat. It is not merely a force-transmitting component but also serves as the crusher's safety part.

1. Function of the Toggle Plate

The toggle plate in a jaw crusher is a relatively simple component structurally, yet its role is crucial. It generally serves three main purposes: Firstly, it transmits power, sometimes even transmitting forces greater than the crushing force itself. Secondly, it acts as a safety device; when non-crushable material enters the crushing chamber, the toggle plate is designed to break first, thereby protecting other machine components from damage. Thirdly, it is used to adjust the size of the discharge opening.

2. Design of the Toggle Plate

During operation, proper lubrication between the toggle plate and its supporting seat is often difficult to achieve, compounded by the ingress of dust. Consequently, the interaction between the toggle plate and its seat essentially involves dry friction and abrasive wear. This high-pressure load leads to rapid wear of both the toggle plate and its seat, resulting in a relatively short service life. Therefore, the structural design of the toggle plate must account for both its critical function and its harsh working environment.

3. Types of Toggle Plates

Based on the connection type between the toggle ends and the seats, toggle plates can be classified into two main types: rolling type and sliding type. The toggle plate and its seat transmit significant crushing forces and are subjected to periodic impact loads. Wear occurs relatively quickly under repeated impact and compression, especially in the sliding type, where it is more severe. To improve transmission efficiency, reduce wear, and extend service life, our company designs the toggle ends with a cylindrical surface and the seats with a flat surface. Because both ends of the toggle plate feature the same cylindrical surface, when the seat surfaces at both ends are parallel, the force on the toggle plate is transmitted along the same diameter of the cylinder and perpendicular to the seat surfaces. During operation, the swing angle of the movable jaw is very small, resulting in a minimal angle between the seat surfaces supporting the toggle plate ends. This allows the toggle plate to maintain pure rolling contact with its seats throughout the machine's operation.