High-efficiency energy-saving airflow crusher

Abstract

The invention discloses a high-efficiency energy-saving airflow crusher. A rotation shaft of a classification wheel is fixed through two supporting points, a dustproof structure is arranged at a material discharging side of the classification wheel, and a direct and non-turning material discharging structure is adopted, so the rotation speed of the classification wheel is substantially improved, the high-efficiency energy-saving airflow crusher is applicable to high-accuracy classification, and an energy-saving dustproof effect is achieved for the classification wheel. The high-efficiency energy-saving airflow crusher is further provided with a bearing dustproof structure to guarantee a safe use environment for a bearing. The framework of the classification wheel is composed of a front impeller disc, a rear impeller disc, a middle impeller disc and a connecting sleeve barrel, so that the rigidity of the classification wheel is improved. Vanes of the classification wheel comprise main vanes and auxiliary vanes, can eliminate eddies and reduce wind resistance. An air inlet pipe of a spraying nozzle is bent towards the direction near a cavity of the airflow crusher and then is connected with the spraying nozzle, so that the structure is compact. The material level height is controlled in a weighing mode, and thus the error range is reduced. The cross section of the bottom of the cavity of the airflow crusher is arc, so that the residual amount and occupied space of materials are reduced.

Description

technical field [0001] The invention belongs to the field of jet mill structure, and in particular relates to a high-performance jet mill with improved structure. Background technique [0002] When the airflow mill works, the compressed air is sprayed into the crushing chamber through the nozzle at high speed. At the intersection of multiple high-pressure airflows, the material is repeatedly collided, rubbed, and sheared to be crushed. The crushed material is blown by the fan. The bottom moves to the classification area with the upward airflow. Under the strong centrifugal force generated by the high-speed rotating classification wheel, the coarse and fine materials are separated. The fine particles that meet the particle size requirements are discharged through the classification wheel, and the coarse particles descend to the crushing area for further crushing. Among them, when the grading wheel is working, the air powder is under the action of centrifugal force, and the la...

AI Technical Summary

Problems solved by technology

Since the classifying wheel is fixed on the rotating shaft and rotates with the rotating shaft, while the discharger is fixed on the cylinder and is stationary, there must be a small gap between the classifying wheel and the discharging device to ensure the normal rotation of the classifying wheel, but The small gap between the classifying wheel and the discharger will easily cause the coarse particle material outside the classifying wheel to leak inward, thus affecting the classification accuracy

In the prior art, in order to facilitate the positioning between the grading wheel and the rotating shaft, such as image 3 As shown, the middle part of the rear impeller disc extends forward with a conical connecting sleeve 53, which is sleeved on the rotating shaft and fixedly connected with the rotating shaft. The inner surface of the conical connecting sleeve is connected to the rotating shaft Coaxial and matching cylindrical surface and its outer surface is a conical surface, and the conical connecting sleeve is relatively short, generally only extending from the rear impeller disk to less than half of the distance between the front and rear impeller disks, in order to increase rigidity , the conical connecting sleeve adopts a conical shape, and the structure of the grading wheel in the prior art has the following defects: insufficient rigidity, low critical speed, and is not suitable for high-speed rotation

And, if Figure 5 As shown, the traditional blade is a straight blade 57, and the blade is assembled perpendicular to the hub. This blade structure has the following defects: when the classification wheel rotates, the blade will generate a local vortex, which will increase the airflow. resistance, which will affect the output of the grading

[0007] In the prior art, the material level control of the jet mill cavity is achieved by controlling the feeding amount of the feeding mechanism through the current feedback signal of the grading motor. The control accuracy of this method is low, which affects the crushing efficiency

[0008] In the prior art, the bottom of the cavity of the jet mill is as Figure 13 As shown, it is generally a conical cylinder 20 structure, and the bottom of the conical cylinder is closed. The disadvantage of this conical cylinder structure is that the residual material at the bottom is relatively large

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