Overload Protection Measures for the Jaw Crusher

The jaw crusher often works in harsh environment, so the load volatility is relatively large and the peak load is usually more than three times than the average load. In addition, the uneven feeding and the extremely tough non-crushing materials into the crushing cavity will suddenly cause the substantial overload danger. The overload of the jaw crusher will not only increase the attrition degree of the inner parts, but also greatly reduce the service life of the equipment. Seriously, the overload danger may pose a threat to the personal safety of the operating personnel. Therefore, there should be overload protection measures for the jaw crusher. At present, the overload protection measures often used can be divided into the following.
The first is the breaking off of the bracket. You can set the low-intensity and easy break point of the bracket. When the overload of the crusher appears, the stress sensitivity district of the toggle plate will break off because the stress sharply rises to the limit, which can cut off the power transmission to prevent the damage to the machine. The traditional overload protection measure has the advantages of simple structure and easy manufacture. However, since the volatility of the mechanical performance of the bracket is relatively large and it is limited to the calculation accuracy, the control breaking point can not be accurately measured.
The second is the protection of the limit moments for the flywheel. You can use the spring friction clutch, hydraulic friction clutch or the safety pin. Such method is often used for the simple pendulum jaw crusher. This kind of clutch should ensure the transfer of the torque under normal condition. In addition, it should make the torque transferred not be more than the allowable value. When there are foreign bodies falling into the crushing chamber, the overload of the machine will appear, which may reach the critical torque. The flywheel can slide freely on the spindle, which can protect the components of the jaw crusher.
The third way is the hydraulic protection. Since the above two overload protection methods may cause certain accidents, which will not suitable for the needs of the production. Therefore, the development of the safe and reliable hydraulic protection device to replace the traditional means can ensure the stable and continuous operation of the machine.
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