Dry sand powder grading separation system

Abstract

The invention belongs to the technical field of material separation, and particularly discloses a dry sand powder grading separation system. Comprising a feeding mechanism, a first-stage sand powder separation tower, a second-stage fine powder classifier, a negative pressure dust collector, an air distribution plate, a through hole, an air inlet, a conical barrel, an inverted conical barrel, a fine powder and air mixing outlet, a feeding pipe, a buffer stock bin, a feeding valve, a first discharging opening, a first discharging valve, a second discharging opening and a second discharging valve. Compared with the prior art, a special air blower is not needed, negative pressure is formed in the whole system only through the induced draft fan of the negative pressure dust collector, dry sand fine powder can be graded and separated, and finished products of different grades are obtained after separation.

Description

Technical Field

[0001] The invention relates to the technical field of material separation, in particular to a dry sand powder classification separation system. Background Art

[0002] With the rapid development of society, natural sand is in short supply. Furthermore, with the introduction of river sand mining restrictions, the amount of natural sand on the market has become increasingly scarce, and machine-made sand has gradually replaced it. Currently, there are two main types of machine sand production processes in China: dry sand production and wet sand production. Both aim to achieve higher-quality sand that meets standards for construction sand. Existing dry sand production processes generally require separating the sand and powder mixture, which involves a sand and powder separation device. Existing sand and powder separation devices use a rotating mechanical device to disperse a mixture of coarse sand, fine sand, and sand powder in an air duct. The airflow in the duct then blows the fine sand powder into a dust collector. However, due to the insufficient speed and concentration of the airflow in the duct, the coarse sand, fine sand, and sand powder in the sand powder are not fully separated, affecting the sand and powder separation process.

[0003] As technicians in this field, it is necessary to propose technical improvements to the shortcomings of the existing technology and provide a technology that can better separate sand powder. Summary of the Invention

[0004] In order to solve the above technical problems, the present invention provides a dry sand powder classification and separation system.

[0005] To achieve the above object, the present invention is implemented according to the following technical solutions: A dry sand powder classification and separation system comprises a feeding mechanism, a first-level sand powder separation tower, a second-level fine powder classifier and a negative pressure dust collector, the discharge port of the feeding mechanism is connected to the feed port of the first-level sand powder separation tower, an air distribution plate is fixed at the lower part of the first-level sand powder separation tower, a plurality of through holes are distributed on the air distribution plate, an air inlet is provided on one side wall of the first-level sand powder separation tower below the air distribution plate, a conical cylinder is fixed on the top of the first-level sand powder separation tower, an inverted conical cylinder is fixed on the bottom, a fine powder and air mixing port is provided on one side wall of the top end of the conical cylinder The top of the conical cylinder is fixedly connected to a feed pipe, the top of the feed pipe is fixed to a buffer silo, a feed valve is installed at the bottom of the buffer silo, the bottom of the inverted conical cylinder is provided with a discharge port 1, and a discharge valve 1 is installed in the discharge port 1; the fine powder and air mixing outlet 1 is connected to the upper side wall of the secondary fine powder classifier through a pipeline, the bottom of the secondary fine powder classifier is provided with a discharge port 2, and a discharge valve 2 is installed in the discharge port 2, the top of the secondary fine powder classifier is connected to the feed port of the negative pressure dust collector through a pipeline, and the negative pressure dust collector is provided with a discharge port.

[0006] Furthermore, the fine powder and air mixing outlet is located on a side wall of the top end of the conical cylinder at the upper part of the end of the feed pipe.

[0007] Furthermore, a wind tube is fixed to the lower end surface of the top of the secondary fine powder classifier, a sealing cover is fixed to the upper end surface of the top of the secondary fine powder classifier, a rotating shaft is installed through the top of the sealing cover through a bearing, the lower part of the rotating shaft is installed at the top of the wind tube through a bearing, the end of the rotating shaft extends into the wind tube and is fixedly installed with blades; the top of the rotating shaft extends to the top of the secondary fine powder classifier and is fixedly connected to the output end of the reduction motor; one side of the sealing cover is connected to the feed port of the negative pressure dust collector through a pipe.

[0008] The fine powder is then carried out of the first sand powder separation tower and into the second fine powder classifier, and a part of the fine powder adhering to the large particles is peeled off from the large particles of sand on the air distribution plate due to the friction between the particles, thereby achieving the purpose of separation, and the large particles of sand are discharged through the discharge port 1 at the bottom of the first sand powder separation tower; since the rotatable blades are arranged on the top of the second fine powder classifier to provide reverse wind pressure, the heavy particles in the fine powder entering the second fine powder classifier fall down, and the light particles follow the blade gaps into the negative pressure dust collector with the negative pressure wind, and the heavy particles are discharged through the discharge port 2; finally, the fine powder with the finest particle size is collected by the negative pressure dust collector, and the graded separation of the mixed dry sand powder is completed. The present invention does not require a special blower, and only forms a negative pressure in the entire system through the induced draft fan of the negative pressure dust collector, so as to grade and separate the dry sand fine powder and obtain finished products of different grades after separation. BRIEF DESCRIPTION OF THE DRAWINGS

[0009] Figure 1 It is a structural schematic diagram of the present invention.

[0010] Figure 2 It is a structural schematic diagram of the first-level sand powder separation tower of the present invention.

[0011] Figure 3 It is a structural schematic diagram of the air distribution plate of the present invention.

[0012] Figure 4 It is a structural schematic diagram of the two-stage fine powder classifier of the present invention. DETAILED DESCRIPTION

[0013] In order to make the purpose, technical solutions and advantages of the present invention more clearly understood, the present invention is further described in detail below in conjunction with the embodiments. The specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention.

[0014] like Figures 1-4As shown, this embodiment exemplarily shows a dry sand powder grading and separation system, including a feeding mechanism 1, a first-level sand powder separation tower 2, a second-level fine powder classifier 3 and a negative pressure dust collector 4. In this embodiment, the feeding mechanism 1 is a bucket elevator, and the discharge port of the feeding mechanism 1 is connected to the feed port of the first-level sand powder separation tower 2. An air distribution plate 21 is fixed at the lower part of the first-level sand powder separation tower 2, and a plurality of through holes 22 are evenly distributed on the air distribution plate 21. An air inlet 23 is provided on one side wall of the first-level sand powder separation tower 2 below the air distribution plate 21. A conical cylinder 24 is fixed on the top of the first-level sand powder separation tower 2, and an inverted conical cylinder 25 is fixed on the bottom. During the separation process, a separation chamber is formed at the top of the first-level sand powder separation tower 2 and a wind chamber is formed at the bottom. A fine powder classifier is provided on the top side wall of the conical cylinder 24. The powder and air mixing outlet 26, the top of the conical cylinder 24 is fixedly connected to a feed pipe 27, the top of the feed pipe 27 is fixed with a buffer silo 28, the bottom of the buffer silo 28 is installed with a feed valve 29, the bottom of the inverted conical cylinder 25 is provided with a discharge port 210, and a discharge valve 211 is installed in the discharge port 210; the fine powder and air mixing outlet 26 is connected to the upper side wall of the secondary fine powder classifier 3 through a pipeline, the bottom of the secondary fine powder classifier 3 is provided with a discharge port 2 31, and a discharge valve 2 32 is installed in the discharge port 2 31, the top of the secondary fine powder classifier 3 is connected to the feed port of the negative pressure dust collector 4 through a pipeline, and the negative pressure dust collector 4 is provided with a discharge port. It should be noted that the negative pressure dust collector 4 can be purchased directly on the market, and its negative pressure wind force can be adapted and adjusted according to needs.

[0015] During actual use, in order to prevent some larger particles in the sand and powder entering and in the sand and powder separation tower 2 from being directly carried into the secondary fine powder classifier 3 by the negative pressure wind, the fine powder and air mixing outlet 26 is located on one side wall of the top of the conical cylinder 25 at the upper part of the end of the feed pipe 27.

[0016] like Figure 4 As shown, a wind tube 33 is fixed to the lower end surface of the top of the secondary fine powder classifier 3, and a sealing cover 34 is fixed to the upper end surface of the top of the secondary fine powder classifier 3. A rotating shaft 35 is installed through the top of the sealing cover 34 through a bearing. The lower part of the rotating shaft 35 is installed on the top of the wind tube 33 through a bearing. The end of the rotating shaft 35 extends into the wind tube 33 and is fixedly installed with a blade 36. Figure 3 As shown, the purpose of the blades 36 in this embodiment is to provide reverse wind pressure, so that the heavy particles in the fine powder entering the secondary fine powder classifier fall down, and the light particles follow the blade gaps and enter the negative pressure dust collector with the negative pressure wind; the top of the rotating shaft 35 extends to the top of the secondary fine powder classifier 3 and is fixedly connected to the output end of the reduction motor 36; one side of the sealing cover 34 is connected to the feed port of the negative pressure dust collector 4 through a pipeline.

[0017] As a typical implementation of this embodiment, when used, Figure 1As shown, the mixed dry sand powder with a crushed particle size of less than 4.8 mm is transported to the buffer silo 28 on the top of the first-level sand powder separation tower 2 through a bucket elevator, and the feed valve 29 is opened. The mixed sand powder falls into the sand powder separation tower 2 under the action of gravity, and the negative pressure air enters the first-level sand powder separation tower 2 from the air inlet 23, and runs upward through the through hole 22 on the air distribution plate 21. The fine powder above 200 mesh is carried out of the first-level sand powder separation tower 2 and enters the second-level fine powder classifier 3 under the action of the negative pressure wind in the first-level sand powder separation tower 2. A part of the fine powder adhering to the large particles is peeled off from the large particles of sand on the air distribution plate 21 due to the friction between the particles, thereby achieving separation. Purpose, open the discharge valve 211, and the sand particles below 200 mesh are discharged through the discharge port 210 at the bottom of the first-level sand powder separation tower; since the rotatable blade 36 is set on the top of the secondary fine powder classifier 3 to provide reverse wind pressure, the heavy particles of 200 mesh-325 mesh in the fine powder above 200 mesh entering the secondary fine powder classifier 3 fall down, and the light particles above 325 mesh follow the gaps of the blades 36 and enter the negative pressure dust collector 4 with the negative pressure wind, open the discharge valve 2 32, and the heavy particles of 200 mesh-325 mesh are discharged through the discharge port 2 31; finally, the fine powder above 325 mesh is collected by the negative pressure dust collector; the graded separation of the mixed dry sand powder is completed, and finished products of different grades are obtained after separation.

[0018] The technical solution of the present invention is not limited to the above-mentioned specific embodiments. Any technical variations made according to the technical solution of the present invention fall within the protection scope of the present invention.

Claims

1. A dry sand powder classification and separation system, comprising a feeding mechanism, a first-level sand powder separation tower, a second-level fine powder classifier and a negative pressure dust collector, characterized in that: The discharge port of the feeding mechanism is connected with the feed port of the first-level sand and powder separation tower, and an air distribution plate is fixed at the lower part of the first-level sand and powder separation tower, and a plurality of through holes are distributed on the air distribution plate. An air inlet is provided on one side wall of the first-level sand and powder separation tower at the lower part of the air distribution plate. A conical cylinder is fixed on the top of the first-level sand and powder separation tower, and an inverted conical cylinder is fixed on the bottom. A fine powder and air mixing outlet is provided on one side wall of the top end of the conical cylinder, and a feed pipe is fixed on the top end of the conical cylinder, and a buffer bin is fixed on the top end of the feed pipe. A feed valve is installed at the bottom of the buffer bin. A discharge port is provided at the bottom of the inverted conical cylinder, and a discharge valve is installed in the first discharge port; the fine powder and air mixing outlet is connected to one side wall of the upper end of the secondary fine powder classifier through a pipeline, and a discharge port 2 is provided at the bottom of the secondary fine powder classifier, and a discharge valve 2 is installed in the second discharge port. The top of the secondary fine powder classifier is connected to the feed port of the negative pressure dust collector through a pipeline, and the negative pressure dust collector is provided with a discharge port. Providing reverse wind pressure, heavy particles fall down and light particles flow through the gaps between the blades.

2. The dry sand powder classification and separation system according to claim 1, characterized in that: The fine powder and air mixing outlet is located on a side wall of the top end of the conical cylinder at the upper part of the end of the feed pipe.

3. The dry sand powder classification and separation system according to claim 1, characterized in that: A wind tube is fixed to the lower end surface of the top of the secondary fine powder classifier, and a sealing cover is fixed to the upper end surface of the top of the secondary fine powder classifier. A rotating shaft is installed through the top of the sealing cover through a bearing, and the lower part of the rotating shaft is installed at the top of the wind tube through a bearing. The end of the rotating shaft extends into the wind tube and is fixedly installed with a blade; the top of the rotating shaft extends to the top of the secondary fine powder classifier and is fixedly connected to the output end of the reduction motor; one side of the sealing cover is connected to the feed port of the negative pressure dust collector through a pipe.

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