Separating device for machine-made sand

Abstract

The utility model relates to a machine-made sand separating device which comprises a material storage tank, a supporting plate is arranged in the material storage tank, a screen frame is arranged above the supporting plate, a first screen is arranged on the inner side of the screen frame, supporting rods are arranged on the screen frame and the supporting plate, and springs are arranged on the supporting rods between the screen frame and the supporting plate. A first guide cone is arranged below the supporting rod, a vibration motor is arranged in the first guide cone, a connecting rod is arranged between the first guide cone and the supporting rod, the bottom of the storage tank communicates with a first conveying pipe, and a classifier is arranged at the outlet end of the first conveying pipe; the classifier comprises a shell, a first discharging pipe, a first air-lock valve, a first sealing cover, a classifying wheel, a fine powder box and a driving shaft, and the fine powder box is communicated with a bag-type dust collector. Coarse grains with overlarge grain sizes can be screened out, and stone powder in the machine-made sand can be screened out, so that the stone powder in the machine-made sand is maintained within a suitable range. The utility model has the advantages of convenient use and wide market prospect.

Description

Technical Field

[0001] The utility model relates to the field of dry-mixed mortar production equipment, and particularly relates to a separation device for manufactured sand. Background Art

[0002] Dry-mixed mortar includes cementitious materials, aggregates and admixtures. Cementitious materials include inorganic cementitious materials such as cement, lime, gypsum, etc., and organic cementitious materials such as redispersible latex powder and water-soluble polyvinyl alcohol, etc. Aggregates include sand and inert powders, etc., but the latter also belongs to mineral admixtures. Mineral admixtures also include slag powder, fly ash, silica fume, etc. Some mortars also contain fibers and pigments, etc. Like any material, the performance of dry-mixed mortar depends on its composition. The inorganic and organic cementitious materials in dry-mixed mortar mainly play a cementing role. Aggregates mainly play a skeletal role, and mineral admixtures mainly improve the workability of the mortar. Both have an important role in volume stability. Chemical admixtures mainly improve the physical properties of fresh mortar, but they also have an important role in the properties of hardened mortar. Chemical admixtures are often some powdery high molecular polymers, including water retention agents, plasticizers, air-entraining agents, defoaming agents, setting regulators, water repellents, etc. In terms of chemical composition, there are cellulose ethers, starch ethers, fatty acid metal salts, calcium formate, citrate, carboxylic acid polyethers, etc.

[0003] The characteristics of concrete aggregates will affect the performance of concrete. This difference is related to both the nature of the aggregates themselves and the interface properties between the aggregates and the mortar. In the current production of dry-mixed mortar, manufactured sand is a relatively easy-to-obtain source of coarse aggregates. Stone powder is generated during the production of manufactured sand. Due to its small particle size, stone powder is used as fine aggregate in dry-mixed mortar. And dry-mixed mortar is determined according to performance indicators, and other types of fine aggregates need to be added to achieve the overall performance of dry-mixed mortar. Therefore, the stone powder transported to the mixer along with the manufactured sand should be maintained at a suitable ratio, so that the ratio of the overall coarse aggregates and fine aggregates reaches an appropriate range to meet the production requirements of dry-mixed mortar. However, from the analysis results of the purchased manufactured sand, the amount of stone powder contained in the manufactured sand is very unstable. Therefore, the purchased manufactured sand should be screened again, so that the stone powder content in the manufactured sand used for dry-mixed mortar production is maintained within a suitable range, thereby improving the product quality of dry-mixed mortar. In addition, there will also be some coarse particles with too large particle sizes in the purchased manufactured sand. According to the production specifications of dry-mixed mortar, this part of the coarse particles with larger particle sizes is not allowed to be added. Because, the more obvious the change in the edges and corners of the coarser the particles, and the concrete made of dry-mixed mortar will have stress concentration due to the change in the edges and corners of the coarse aggregate, resulting in the expansion of microcracks, causing the accumulation of damage and reducing the mechanical properties of the concrete. Therefore, the coarse particles with too large particle sizes in the manufactured sand should also be screened to further improve the product quality of dry-mixed mortar. Summary of the Invention

[0004] Aiming at the deficiencies of the prior art, the utility model provides a separation device for manufactured sand, which can screen out coarse particles with too large particle size and screen out stone powder in the manufactured sand, so as to keep the stone powder in the manufactured sand within an appropriate range, and is used to overcome the defects in the prior art.

[0005] The technical solution adopted by the utility model is as follows: a separation device for manufactured sand, which includes a storage tank. A support plate is arranged in the storage tank. Above the support plate, there is a screen frame. A first screen is arranged inside the screen frame. Support rods are arranged on the screen frame and the support plate. Springs are arranged on the support rods between the screen frame and the support plate. A first guiding cone is arranged below the support rod. A vibration motor is arranged inside the first guiding cone. A connecting rod is arranged between the first guiding cone and the support rod. The bottom of the storage tank is communicated with a first conveying pipe. A classifier is arranged at the outlet end of the first conveying pipe. The classifier includes a shell, a first discharge pipe arranged at the bottom of the shell, a first airtight device arranged on the first discharge pipe, a first cover arranged on the shell, a classification wheel arranged on the first cover, a fine powder box arranged above the classification wheel, and a driving shaft arranged on the classification wheel and the fine powder box. A bag filter is communicated with the fine powder box.

[0006] Preferably, the included angle between the first screen and the horizontal plane is 25 degrees to 35 degrees. Part of the screen frame is matched with the first screen. The bottom of the storage tank is in a hopper shape. A screen-over discharge pipe is arranged on the storage tank at one side of the bottom end of the first screen.

[0007] Preferably, the storage tank adopts a box-shaped structure with an opening at the top. A second cover is arranged on the top of the storage tank. A material leveling pipe is arranged on the second cover. A third conveying pipe is arranged on the material leveling pipe. A feeder is arranged on the third conveying pipe. A feeding motor is arranged on the feeder.

[0008] Preferably, the material leveling pipe successively includes a first connecting pipe, a reducing pipe and a second connecting pipe from top to bottom. The width of the reducing pipe is along the first connecting pipe to the second connecting pipe. A guiding plate is arranged inside the reducing pipe. The number of the guiding plates is several. The several guiding plates evenly divide the inner cavity of the reducing pipe into several guiding cavities. The cross section of the inner cavity of the second connecting pipe and the cross section of the inner cavity at the bottom of the reducing pipe are both rectangular structures. The second connecting pipe is located above the top end of the first screen.

[0009] Preferably, the classification wheel includes a second guiding cone, a bottom plate disposed on the top surface of the second guiding cone, classification blades disposed above the bottom plate, and a connecting ring disposed above the classification blades. The bottom plate is mounted on a driving shaft. A fixing rod is disposed between the driving shaft and the connecting ring. The number of the classification blades and the fixing rods are both several. The several classification blades are evenly distributed in a star shape on the bottom plate and the connecting ring outside the central axis of the driving shaft. The fixing rods are evenly distributed in a star shape between the driving shaft and the connecting ring.

[0010] Preferably, a second air lock is disposed between the storage tank and the first conveying pipe. A one-way valve is disposed on the first conveying pipe between the inlet end of the first conveying pipe and the second air lock. A third cover is disposed on the inlet end of the first conveying pipe. A second filter screen is disposed on the third cover. A pressing ring is disposed on the side of the second filter screen away from the first conveying pipe. The pressing ring is movably connected to the second filter screen. Fixing bolts are disposed on the pressing ring and the third cover.

[0011] Preferably, a second conveying pipe is disposed on the bag filter. A regulating valve and a draft fan are sequentially disposed on the second conveying pipe along the direction from near the bag filter to far from the bag filter.

[0012] The beneficial effects of the present utility model are as follows: First, the present utility model can screen out oversize coarse grains from the purchased machine-made sand raw materials and separate a large amount of stone powder from the machine-made sand after the coarse grain screening, so that the stone powder in the machine-made sand is maintained within an appropriate range, which is convenient for adding other functional fine aggregate components, and further realizes maintaining the ratio of all fine aggregates and dry-mixed mortar within a preset range.

[0013] Second, a regulating valve, a draft fan and a gas flow sensor are sequentially disposed on the second conveying pipe of the present utility model along the direction from near the bag filter to far from the bag filter; installing the gas flow sensor is convenient for feeding back gas flow parameters.

[0014] The present utility model has the advantages of simple structure, convenient operation, ingenious design, greatly improving the work efficiency, having good social and economic benefits, and being a product easy to promote and use. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 is a schematic structural diagram of the present utility model.

[0016] Figure 2 is Figure 1 a partially enlarged schematic diagram of detail A.

[0017] Figure 3 is Figure 1 a partially enlarged schematic diagram of detail B.

[0018] Figure 4 is Figure 1Partial enlarged schematic diagram of detail C.

[0019] Figure 5 Structural schematic diagram of the material equalizing pipe of the present utility model. Specific embodiments

[0020] As Figures 1 to 5 shown, a separation device for manufactured sand includes a storage tank 1. A support plate 2 is arranged inside the storage tank 1. Above the support plate 2, a screen frame 3 is arranged. A first screen 4 is arranged inside the screen frame 3. Support rods 5 are arranged on the screen frame 3 and the support plate 2. Springs 7 are arranged on the support rods 5 between the screen frame 3 and the support plate 2. A first guiding cone 8 is arranged below the support rod 5. The diameter of the top of the first guiding cone 8 gradually increases as the height of the first guiding cone 8 decreases. A vibration motor 9 is arranged inside the first guiding cone 8. A connecting rod 10 is arranged between the first guiding cone 8 and the support rod 5. The bottom of the storage tank 1 is communicated with a first conveying pipe 11. A classifier is arranged at the outlet end of the first conveying pipe 11. The classifier includes a housing 12, a first discharge pipe 13 arranged at the bottom of the housing 12, a first airtight valve 14 arranged on the first discharge pipe 13, a first cover 15 arranged on the housing 12, a classification wheel arranged on the first cover 15, a fine powder box 16 arranged above the classification wheel, and a driving shaft 17 arranged on the classification wheel and the fine powder box 16. The driving shaft 17 is in transmission connection with a driving motor. A bag filter 18 is communicated with the fine powder box 16.

[0021] A second conveying pipe 37 is arranged on the bag filter 18. A regulating valve 38, an induced draft fan 39, and a gas flow sensor 40 are sequentially arranged on the second conveying pipe 37 along the direction from near the bag filter 18 to far from the bag filter 18.

[0022] The number of the support rods 5 is four. The four support rods 5 are distributed at the four corners of the screen frame 3. The included angle between the first screen 4 and the horizontal plane is 25 degrees to 35 degrees. Part of the screen frame 3 cooperates with the first screen 4. Support plates 2 are installed both above the top end and below the bottom end of the screen frame 3. The aperture of the first screen 4 is 4.5 mm. The bottom of the storage tank 1 is in a funnel shape. A screen oversize discharge pipe 19 is arranged on the storage tank 1 at one side of the bottom end of the first screen 4. The outer diameter of the circumcircle of the inner cavity of the screen oversize discharge pipe 19 gradually becomes larger as the screen oversize discharge pipe 19 gradually approaches the storage tank 1.

[0023] The described storage tank 1 adopts a box-shaped structure with an opening at the top. A second cover 20 is provided at the top of the storage tank 1. A material leveling pipe 21 is provided on the second cover 20. A third conveying pipe 22 is provided on the material leveling pipe 21. A feed hopper is provided at the top end of the third conveying pipe 22. A blanking device 23 is provided on the third conveying pipe 22. A blanking motor 24 is provided on the blanking device 23. The material leveling pipe 21 successively includes a first connecting pipe, a reducing pipe, and a second connecting pipe from top to bottom. The width of the reducing pipe is along the first connecting pipe to the second connecting pipe. A guiding plate 25 is provided inside the reducing pipe. The number of guiding plates 25 is several. The several guiding plates 25 evenly divide the inner cavity of the reducing pipe into several guiding cavities. The cross-section of the inner cavity of the second connecting pipe and the cross-section of the inner cavity at the bottom of the reducing pipe are both rectangular structures. The second connecting pipe is located above the top end of the first sieve 4. By providing the guiding plate 25 inside the material leveling pipe 21, it is convenient to make the manufactured sand pass through the material leveling pipe 21 evenly.

[0024] The described grading wheel includes a second guiding cone 26, a bottom plate 27 provided on the top surface of the second guiding cone 26, grading blades 28 provided above the bottom plate 27, and a connecting ring 29 provided above the grading blades 28. The bottom plate 27 is installed on the driving shaft 17. A fixing rod 30 is provided between the driving shaft 17 and the connecting ring 29. Further, the number of grading blades 28 and fixing rods 30 is several. The several grading blades 28 are evenly distributed in a star shape on the bottom plate 27 and the connecting ring 29 outside the central axis of the driving shaft 17. The fixing rods 30 are evenly distributed in a star shape between the driving shaft 17 and the connecting ring 29. Installing several fixing rods 30 improves the installation stability between the connecting ring 29 and the driving shaft 17. The central axes of the second guiding cone 26, the bottom plate 27, the driving shaft 17, and the connecting ring 29 are on the same axis; the diameter of the second guiding cone 26 gradually becomes smaller as the height of the second guiding cone 26 decreases. The outlet end of the first conveying pipe 11 faces the bottom end of the second guiding cone 26. The central axis of the outlet end of the first conveying pipe 11 and the central axis of the second guiding cone 26 are on the same axis, so as to facilitate the manufactured sand conveyed through the first conveying pipe 11 to be guided by the second guiding cone 26 into the inner cavity between the grading blades 28 and the housing 12.

[0025] A second airtight device 31 is provided between the storage tank 1 and the first conveying pipe 11. A one-way valve 32 is provided on the first conveying pipe 11 between the inlet end of the first conveying pipe 11 and the second airtight device 31. A third cover 33 is provided at the inlet end of the first conveying pipe 11. A second filter screen 34 is provided on the third cover 33. A pressing ring 35 is provided on the side of the second filter screen 34 away from the first conveying pipe 11. The pressing ring 35 is movably connected to the second filter screen 34. Fixing bolts 36 are provided on the pressing ring 35 and the third cover 33. Installing the second filter screen 34 is convenient for filtering impurities carried by the air entering the first conveying pipe 11.

[0026] The usage method of this product is as follows. As Figures 1 to 5 shown, it includes the following steps:

[0027] First, the purchased manufactured sand is conveyed to the feed hopper, and after being guided by the feed hopper, it is conveyed to the third conveying pipe 22. Driven by the blanking device 23, it enters the material equalizing pipe 21. Then, after being guided by several guide plates 25 in the material equalizing pipe 21, it is conveyed into the inner cavity of the storage tank 1. At the same time, the vibration motor 9 is turned on. The vibration motor 9 drives the first guiding cone 8 to vibrate, and the first guiding cone 8 drives the support rod 5 and the connecting rod 10 to vibrate, thereby driving the screen frame 3 to vibrate. The first screen 4 installed inside the screen frame 3 vibrates synchronously with the screen frame 3, thereby driving the manufactured sand above the first screen 4 to vibrate and slide down along the first screen 4. During this process, the oversize materials are conveyed to the oversize material discharge pipe 19 and discharged from the storage tank 1, and the undersize materials are guided by the first guiding cone 8 and temporarily stored at the bottom of the storage tank 1. During the vibration of the screen frame 3, the spring 7 installed on the support rod 5 between the screen frame 3 and the support plate 2 plays a buffering role.

[0028] Then, start the induced draft fan 39 and adjust the opening degree of the regulating valve 38 until the value feedback by the gas flow sensor 40 reaches the preset range. At this time, the outside atmosphere enters the first conveying pipe 11 through the second filter screen 34 to form a conveying air flow. At the same time, start the second air lock 31 and the said driving motor. The second air lock 31 drives the manufactured sand at the bottom of the storage tank 1 to be conveyed into the first conveying pipe 11. The said conveying air flow drives the manufactured sand entering the first conveying pipe 11 to move forward and be discharged from the outlet end of the first conveying pipe 11. After being guided by the second guiding cone 26, during this period, the driving motor drives the driving shaft 17 to rotate and simultaneously drives the second guiding cone 26, the bottom plate 27, several grading blades 28 and the connecting ring 29 to rotate synchronously. The air flow passing through the gaps between several grading blades 28 carries the stone powder and a small amount of manufactured sand with smaller particle sizes in the manufactured sand through several grading blades 28 in the rotating state and conveys them to the fine powder box 16. The manufactured sand with larger particle sizes carries a small amount of stone powder and is screened out by several grading blades 28 and falls along the inner cavity of the housing 12 to the bottom of the housing 12 and is continuously discharged outward through the first air lock 14 to form the screened manufactured sand.

[0029] Finally, the air flow passing through the gaps between several grading blades 28 carries the stone powder and a small amount of manufactured sand with smaller particle sizes and conveys them to the bag filter 18 for gas-solid separation. The solid phase part is the stone powder and a small amount of manufactured sand with smaller particle sizes. This solid phase part is continuously discharged through the solid phase discharge port of the bag filter 18 and collected separately, while the gas phase part enters the second conveying pipe 37 and is discharged to the tail gas treatment device under the action of the induced draft fan 39.

[0030] Through this embodiment, it is possible to screen out the coarse particles with too large particle size from the purchased manufactured sand raw materials and separate a large amount of stone powder from the manufactured sand after the coarse particle screening, so that the stone powder in the manufactured sand is maintained within an appropriate range, which is convenient for adding other functional fine aggregate components, and further realizes maintaining the ratio of all fine aggregates to dry-mixed mortar within a preset range.

[0031] The above-mentioned embodiments are only the preferred embodiments of the present invention, and do not limit the scope of implementation of the present invention. Therefore, all equivalent changes or modifications made according to the structure, features and principles described in the scope of the present invention patent should be included in the scope of the present invention patent application.

Claims

1. A separation device for machine-made sand, characterized in that: The invention comprises a material storage tank (1), wherein a support plate (2) is arranged in the material storage tank (1), a screen frame (3) is arranged above the support plate (2), a first screen (4) is arranged inside the screen frame (3), a support rod (5) is arranged on the screen frame (3) and the support plate (2), a spring (7) is arranged on the support rod (5) between the screen frame (3) and the support plate (2), a first guide cone (8) is arranged below the support rod (5), a vibration motor (9) is arranged in the first guide cone (8), a connecting rod (10) is arranged between the first guide cone (8) and the support rod (5), and the bottom of the material storage tank (1) is provided with a plurality of support rods (5). A first conveying pipe (11) is connected, and a classifier is arranged on the outlet end of the first conveying pipe (11), the classifier comprising a shell (12), a first discharge pipe (13) arranged on the bottom of the shell (12), a first air shut-off device (14) arranged on the first discharge pipe (13), a first sealing cover (15) arranged on the shell (12), a classifying wheel arranged on the first sealing cover (15), a fine powder box (16) arranged above the classifying wheel, and a driving shaft (17) arranged on the classifying wheel and the fine powder box (16), and a bag dust collector (18) connected to the fine powder box (16).

2. The machine-made sand separation device according to claim 1, characterized in that: The angle between the first screen (4) and the horizontal plane is 25 to 35 degrees, a part of the screen frame (3) and the first screen (4) are matched, the bottom of the storage tank (1) is bucket-shaped, and an overscreen discharge pipe (19) is provided on the storage tank (1) on one side of the bottom end of the first screen (4).

3. The machine-made sand separation device according to claim 2, characterized in that: The material storage tank (1) adopts a box-shaped structure with an open top. A second sealing cover (20) is arranged on the top of the material storage tank (1). A material distribution pipe (21) is arranged on the second sealing cover (20). A third conveying pipe (22) is arranged on the material distribution pipe (21). A discharger (23) is arranged on the third conveying pipe (22). A discharger motor (24) is arranged on the discharger (23).

4. The machine-made sand separation device according to claim 3 is characterized in that: The material balancing pipe (21) comprises, from top to bottom, a first connecting pipe, a reducing pipe and a second connecting pipe in sequence. The width of the reducing pipe extends from the first connecting pipe to the second connecting pipe. A guide plate (25) is arranged inside the reducing pipe. The number of the guide plates (25) is several. The guide plates (25) evenly divide the inner cavity of the reducing pipe into several guide cavities. The cross-section of the inner cavity of the second connecting pipe and the cross-section of the inner cavity at the bottom of the reducing pipe are both rectangular structures. The second connecting pipe is located above the top of the first screen (4).

5. The machine-made sand separation device according to claim 1, characterized in that: The grading wheel comprises a second guide cone (26), a bottom plate (27) arranged on the top surface of the second guide cone (26), grading blades (28) arranged above the bottom plate (27), and a connecting ring (29) arranged above the grading blades (28); the bottom plate (27) is mounted on the driving shaft (17); a fixing rod (30) is arranged between the driving shaft (17) and the connecting ring (29); the number of the grading blades (28) and the fixing rod (30) is a plurality; the plurality of grading blades (28) are evenly distributed in a star shape on the bottom plate (27) and the connecting ring (29) outside the central axis of the driving shaft (17); and the fixing rod (30) is evenly distributed in a star shape between the driving shaft (17) and the connecting ring (29).

6. The machine-made sand separation device according to claim 1, characterized in that: A second air lock (31) is provided between the storage tank (1) and the first delivery pipe (11); a one-way valve (32) is provided on the first delivery pipe (11) between the inlet end of the first delivery pipe (11) and the second air lock (31); a third sealing cover (33) is provided on the inlet end of the first delivery pipe (11); a second filter screen (34) is provided on the third sealing cover (33); a pressure ring (35) is provided on the side of the second filter screen (34) away from the first delivery pipe (11); the pressure ring (35) and the second filter screen (34) are movably connected; fixing bolts (36) are provided on the pressure ring (35) and the third sealing cover (33).

7. The machine-made sand separation device according to claim 1, characterized in that: The bag-type dust collector (18) is provided with a second conveying pipe (37), and the second conveying pipe (37) is provided with a regulating valve (38) and an induced draft fan (39) in sequence along a direction from close to the bag-type dust collector (18) to far from the bag-type dust collector (18).

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