Pre-grading device and vibration screening machine with same

Abstract

The invention discloses a pre-grading device and a vibration screening machine with the same and relates to the field of gravel screening machines. The pre-grading device comprises an air blower, a main grading cavity, a feeding channel and a plurality of discharging channels. The main grading cavity is provided with an air inlet, a feeding opening and a plurality of discharging openings, and an air outlet of the air blower is connected with the air inlet; the feeding opening is formed in the upper portion of the main grading cavity and connected with the feeding channel, and all the discharging openings are formed in the lower portion of the main grading cavity and are connected with the discharging channels in a one-to-one corresponding mode; and all the discharging openings are formed in an arrayed mode in the direction opposite to the air inlet along the air inlet, and the feeding opening corresponds to the discharging opening closest to the air inlet or is closer to the air inletthan the discharging opening. The vibration screening machine comprises a screen cloth device with a plurality of layers of screen clothes being vertical arranged at intervals and further comprises avibrating mechanism and the pre-grading device which are connected with the screen cloth device; the pre-grading device is arranged above the front section of the screen cloth device, and the front ends of all layers of the screen cloths, except the screen cloth of the bottommost layer, of the screen cloth device are each provided with a lower layer falling opening; and the discharging openings ofall the discharging channels correspond to all the screen clothes from top to bottom in one-to-one and layer-by-layer modes in the direction opposite to the air inlet along the air inlet, and the layer number of the screen clothes of the screen cloth device is matched with the number of the discharging channels.

Description

technical field [0001] The invention relates to the field of sand and gravel screening machines, in particular to a device for pre-grading sand and gravel and a vibrating screening machine. Background technique [0002] The structure of the traditional screening machine used for sand and gravel screening usually includes a screen device arranged at intervals above and below the multi-layer screen, and a vibration mechanism connected to the screen device to achieve the vibration effect. When screening, the material directly falls into the uppermost screen. At the beginning, the uppermost layer is vibrated to displace and separate the large and small particles. At the same time, the material moves forward on the screen for a certain distance, and after the small particles sink, the large particles float up and start the real screening. In this way, the next layer and then There is basically no material to be screened in the front section of the screen on the next layer, and th...

AI Technical Summary

Problems solved by technology

[0002] The structure of the traditional screening machine used for sand and gravel screening usually includes a screen device arranged at intervals above and below the multi-layer screen, and a vibration mechanism connected to the screen device to achieve the vibration effect. When screening, the material directly falls into the uppermost screen. At the beginning, the uppermost layer is vibrated to displace and separate the large and small particles. At the same time, the material moves forward on the screen for a certain distance, and after the small particles sink, the large particles float up and start the real screening. In this way, the next layer and then There is basically no material to be screened in the front section of the screen on the next layer, and the screening work is mainly started in the middle and rear sections. It can be seen from this that the screening method of the existing screening machinery wastes the front section of the first layer of screen without actual screening. As a result, the screening efficiency is low, so that there is almost no material in the front section of the following screens for secondary screening, resulting in energy efficiency waste and low efficiency. In addition, the existing feeding method accumulates more in the front section of the first layer of screens. Part of the screen load is relatively large, the screen is easy to be damaged, the mechanical energy consumption is high, and the screening rate is low

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