Jaw Crusher Toggle Plate Wear

During normal operation, because the toggle plate and toggle plate seat in a jaw crusher cannot be effectively lubricated - meaning an oil film cannot form between them - and additionally due to dust ingress, the condition between the toggle plate and its seat is essentially one of dry friction and abrasive wear. This leads to rapid wear of both the toggle plate and the toggle plate seat, resulting in a short service life. Therefore, extending the service life of the jaw crusher toggle plate is a very important task. Based on specific operating conditions, we have developed improvement plans for jaw crusher toggle plate wear.

Improvement Solutions:

1. Change from Sliding to Rolling Type: Generally, the swing angle does not exceed 10 degrees. Therefore, by designing the toggle ends and seats in this type as a rolling type instead of sliding, it achieves the conversion from sliding to rolling, improves transmission efficiency, reduces wear, and extends its service life.

2. Change the Lubricant between Toggle Head and Seat: The wear of the jaw crusher toggle head and seat is influenced not only by the motion characteristics but also by lubrication conditions and dust. The most effective way to improve the wear condition between part surfaces is proper lubrication of the jaw crusher. This not only improves the efficiency of the jaw crusher but also extends the part's service life and ensures normal machine operation. If the lubrication effect is very poor, water lubrication can be used. Water can both carry away the heat generated by friction and wash away dust, thereby extending the service life of the toggle head and seat.

3. Adopt a Rational Toggle Head and Seat Structure: Based on the principle of replacing sliding with rolling, and to make the toggle seat easier to replace and extend its life, Hongxing Heavy Industry manufactures the toggle seat as cylindrical, with square ends for easy fixation. When one side wears out, another side can be used, allowing rotation for up to 4 uses, extending the service life.

4. Improve the Fit Surface Shape between Toggle Seat and Toggle Block: In older jaw crushers, the fit surface between the toggle seat and the toggle block typically used a sliding type. With this shape, the toggle seat undergoes prolonged impact and compression, leading to deformation and expansion, making it very difficult to remove the toggle seat from the toggle block's groove during replacement. The shape of the fit surface between the toggle seat and the toggle block groove should be changed to a trapezoid.

Toggle Plate Falling Off

When non-crushable objects mixed with ore enter the crushing chamber, the various linkage components may fail if the forces exceed the allowable material limits. To protect other linkages from damage, the toggle plate - a relatively simple and smaller component - is designed with lower strength to act as a safety device. If the toggle plate falls out during machine operation, the cause of this failure should be investigated. Generally, the reasons for the toggle plate falling out may include the following:

1. The tension rod spring is damaged or has loosened.

2. The tension rod is broken or the nut has come off.

3. The toggle plate and the toggle block are not parallel and are misaligned.

4. The hardness or toughness of the material being crushed exceeds the specifications in the manual.

5. The motor wiring is reversed.

6. The jaw plate has shifted, causing tooth tip to oppose tooth tip.

The sliding groove in the machine frame that accommodates the toggle block has worn, becoming asymmetrically concave (approx. 10mm), causing the toggle block to sit non-parallel in the groove, leading to toggle plate detachment. Alternatively, the welded positioning strips on the machine frame have worn unevenly in thickness, with significant measured error, causing the adjusting wedge and the machine frame to contact non-vertically, resulting in toggle plate fall-out. When the movable jaw moves upward, the stressed toggle block tilts and becomes non-parallel to the toggle plate, making it easy for the toggle plate to disengage from the toggle block. Countermeasures for the above problems are as follows:

1. Repair the toggle block's mating sliding groove to ensure the toggle block moves parallel within the groove.

2. Repair the machine frame's sliding strips to ensure vertical movement (up/down) when engaged with the toggle block.

3. Adhere to the repair principle of not changing the crusher's parameters: The nip angle between the jaws can be adjusted between 18-23°; the crushing ratio can reach up to 10; the toggle plate length should be suitable selected for K=(16.5-25)r; the swing stroke S≈(2-2.2)r is appropriate.