Graded screening device for sand and gravel on construction site

Abstract

The invention discloses a graded screening device for sand and gravel on a construction site, Include filter box, the upper surface of the screening box is provided with a feeding port, A No. I discharge port is arranged in the middle of the lower surface of the screening box, and support legs are fixedly installed at four corner positions of the lower surface of the screening box. The double evacuation mechanism is provided in the invention, which not only can disperse the falling sand and gravel during screening, but also slows down the falling speed of the sand and gravel, and improves screening efficiency. A rotating rod and a movable blade are arranged, and the movable blade is driven to rotate by the gravity of sand and gravel to generate wind-driven dust, and the dust is purified byan adsorption mechanism, thereby improving the working environment quality of the construction personnel; A pull mechanism is provided, which facilitates the worker to drive the screen to move left and right, facilitates the removal of larger grains of sand and gravel blocked on the screen, and accelerates the screening speed of the sand and gravel. The screening device has high screening efficiency, simple operation, and is convenient to be widely popularized to the market.

Description

technical field [0001] The invention relates to the construction field, in particular to a sand and gravel grading and screening device on a construction site. Background technique [0002] With the rapid development of social economy, people's demand for housing is increasing, which has led to more and more people's attention in the construction industry. For a long time, people have played an increasingly important role in the construction industry , most of the operations are performed by humans. Some construction sites need to classify and screen a small amount of sand and gravel to remove the larger sand and gravel, so as to retain the fine sand to meet the normal working conditions of workers. Work. [0003] The Chinese patent discloses a sand screening device for construction (authorized announcement number CN207515072U). The other side of the frame is provided with an eccentric wheel, the eccentric wheel is connected with the motor shaft of the No. The middle posi...

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Problems solved by technology

[0003] The Chinese patent discloses a sand screening device for construction (authorized announcement number CN207515072U). The other side of the frame is provided with an eccentric wheel, the eccentric wheel is connected with the motor shaft of the No. The middle position of the crossbeam is vertically provided with a through hole, the through hole is provided with a bearing, and the bearing is provided with a rotating shaft. The utility model makes the thickness of the sieved sand through the setting of the No. 1 sieve and the No. 2 sieve. It is more uniform, its overall structure design is reasonable and simple, it is very convenient to use, it can effectively reduce the cost of sand screening, and reduce its labor intensity. On the ground, the internal sand and gravel are affected by the external humid environment factors, and the converging piles are bonded together, which makes it difficult to remove the sand and gravel after the first screening. Secondly, when pouring the sand and gravel into the screening box from the feed port, A lot of dust is flying up at the position of the feed inlet, and long-term work will cause serious harm to the lungs of the staff. Finally, when the sand is sifted, the larger sand will block the mesh of the screen, thereby reducing the efficiency of the device. Screening efficiency

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