The dust-generating points of jaw crusher mainly include the dust-generating point of the feeding port, the dust-generating point of the discharging port, and the dust generated when the discharging chute is not tightly sealed. If the dustproof measures are not ideal, the amount of dust is often large and the burst is strong, which will cause serious pollution to the environment in the production workshop, and bring certain occupational hazards to the operators, which is one of the main pollution sources.
Common dust-proof measures The traditional dust-proof measures for jaw crushers mainly include the following, which are also commonly used:
1. Seal the jaw crusher with an integral airtight cover to prevent dust from spreading around. However, since a large amount of air is induced when the material falls, a positive pressure is formed inside the airtight cover, so that the pressure inside the airtight cover is greater than the external pressure, so that a large amount of dust overflows from the gaps and places where the connection is not tightly sealed, polluting the air in the workplace. This simple and closed method has poor dustproof effect on the jaw crusher.
2. Spray dust reduction Water spray devices are installed in the three main parts of the jaw crusher, which are the feeding port, the discharging port and the crushing cavity, to spray and sprinkle water on the dust. This method reduces the generation of dust to a certain extent. It has a certain effect on reducing the dust concentration in the workplace. However, spray dust suppression is limited by broken materials, production technology, climate and other conditions. In addition, it is difficult to adjust the amount of water spray effectively, and the amount of water spray is small, so it is difficult to achieve the purpose of effective dust prevention. The fine dust adheres to the equipment, causing serious dust on the ground near the lower part, and it is easy to cause secondary dust and other problems during transportation.
3. Airtightness, ventilation and dust removal In order not to affect the observation of operators, an external exhaust hood is used for dust removal.
1. Mainly install a local dust hood on the upper part of the jaw crusher. Since the equipment and the exhaust hood are not airtight, the dust collection point is far away from the crushing dust point, resulting in a large air volume and negative pressure, resulting in high energy consumption of the dust removal equipment.
2. The dust removal method in the upper part of the jaw crusher controls the dust in the upper part to a certain extent, but the main escape dust in the lower part has not been effectively controlled, and the dust removal effect is poor. In addition, a large amount of dust escapes from the chute of the discharge port. (About 25% of the dust escapes from the guide trough and cannot be collected), causing dust in the belt conveyor corridor to diffuse. The dust removal method also affects the normal maintenance of the jaw crusher.
3. A dust-proof soft curtain can be hung at the jaw crusher and the feeding belt, a movable airtight cover can be set above the jaw crusher, and a second dust-proof soft curtain can be set in the middle of the jaw crusher's discharge chute. The dust cover is arranged between the chute at the discharge port and the second dust-proof soft curtain. When the jaw crusher is working, the material is transported by the belt to the working chamber for crushing, and the operator can observe it through the movable closed cover above. The dust generated in the process of material crushing and the dust entrained by the material are filtered through the exhaust hood and filtered by the dust removal system and then evacuated. The crushed materials are transported to the next process through the discharge chute and the second hanging soft curtain to the discharge belt. A dust hood is set between the chute at the discharge port and the second hanging soft curtain, because the dust hood is close to the dust generating point and is a low-pressure area of crushing airflow. A simple closed space is formed inside the crusher, and a negative pressure can be formed with a small air volume, and the dust generated by the crushing can be discharged efficiently.
