The role of the jaw crusher safety device and problem statement;
Safety device:
Mechanical safety consists of elbow plate, elbow plate seat, sprung, sprung puller, etc. Elbow plate is the part of crusher that plays the role of safety under abnormal condition.
Elbow plate: also known as thrust plate. It can transmit power and support the lower end of the movable jaw for swinging, and is also the safety device of the jaw crusher. When the crushing cavity enters the difficult material, the elbow plate breaks first, thus protecting the valuable parts of the machine (such as the movable jaw, body, etc.) from damage.
(1) The elbow plate is fractured.
Reasons:
- the size of the discharge opening is too small, causing the blockage of the passing material;
- the equipment has iron passing through;
- the elbow plate is not parallel to the elbow plate pad and has deflection;
- The casting has a more serious casting defect.
Solutions:
- adjusting the size of the discharge opening to prevent passing material jamming;
- set iron blocking device to prevent crushing iron from entering the crusher;
- Replace the elbow plate and replace the worn elbow plate pad and install the elbow plate correctly; replace the qualified elbow plate.
(2) The elbow plate seat is severely worn.
Reasons:
- the mixing of foreign matter, causing the wear of the elbow plate seat;
- no / lack of lubricant
Solutions:
Regularly clean foreign objects at regular intervals, by checking every two days whether there are foreign objects mixed into the elbow plate seat, and timely grease lubrication of the elbow plate seat to prevent the mixing of foreign objects.
(3) The elbow plate falls off.
Reasons;
- Give into the material size is too large caused by the impact off;
- Insufficient spring tension;
- The material feeding position is not reasonable, resulting in the material directly acting on the upper moving jaw body cover, causing the elbow plate to fall off.
Solutions:
- The supply of material should be uniform and of reasonable size;
- The feeding position should be on the back wall of the hopper, not directly on the upper moving jaw cover;
- Adjust the reasonable spring tension.
(4) Elbow plate bending rupture.
Reasons;
- tension spring tension is not enough;
- Feeding material size does not meet the requirements;
- Foreign objects stuck in the bottom of the crushing cavity;
- Elbow plate installation is not standardized and reasonable.
Solutions:
- Adjust the tension of the spring;
- Control of feed size;
- Set the crushing cavity foreign object jamming detection device, timely take out the miscellaneous iron or other foreign objects;
- Elbow plate installation should meet the smooth and flat surface, and installed in the middle of the elbow plate seat does not shift, the elbow plate seat maintenance work in place and timely.
(5) The elbow plate support pad produces a crashing sound.
Reasons;
- Insufficient spring tension;
- Support pad wear or loose.
Solutions:
- Adjust the spring force or replace the spring;
- Fasten or amend the support seat.