A high-viscosity spray slurry screening device

Abstract

The present application relates to a kind of high viscosity spray slurry screening device, effectively solve the low efficiency of slurry screening, screen mesh hole jam is not easy to clean up;Solving technical solutions include box type screening chamber, screening chamber is connected with feed pipe and discharge pipe, the middle section of feed pipe and discharge pipe is equipped with a section of U-shaped material storage bend, the middle part of screening chamber is equipped with horizontal screen assembly, screen assembly divides screening chamber into upper chamber and lower chamber, a first air pipe is mounted on the side wall of screening chamber, the upper end of first air pipe is communicated with the upper chamber of screening chamber, the lower end of first air pipe is communicated with the lower chamber of screening chamber, first air pump is mounted on first air pipe, first air pump is started to pump the air in the lower chamber of screening chamber to the upper chamber;The present application can accelerate slurry down leakage through positive and negative pressure difference, improve screening efficiency, or dredge the mesh hole of stick block;Through four-layer composite screen assembly, the aggregate jammed in mesh hole can be easily dropped, and the screen assembly is easy to clean.

Description

Technical Field

[0001] This invention relates to the field of construction screening equipment, specifically a screening device for high-viscosity spray slurry. Background Technology

[0002] In the construction industry, the application of mortar spraying is becoming increasingly widespread. Before spraying, the mortar is usually filtered to remove impurities, such as large-diameter aggregates. However, this type of mortar has a high viscosity and poor self-flowability. In order to improve its speed of passing through the filter, a vibrator is usually installed on the filter, but the effect is limited and the equipment generates a lot of noise and vibration.

[0003] The invention patent application number CN201711437387.7 provides a screen composed of interwoven grid plates and reinforcing ribs. The main idea is to create an uneven surface on the upper surface of the screen by using staggered grid plates or non-straight edge designs, making it difficult for aggregates to maintain balance on the screen surface and thus accelerating their falling speed. Although this design has some effect, the poor self-flowability of the slurry is mainly due to the high viscosity of the slurry. Improving the aggregate condition is only a temporary solution and has limited effect. In addition, during the current filter screen, aggregates with a diameter close to the mesh size are easy to get stuck in the mesh and are difficult to clean after they are stuck. Summary of the Invention

[0004] This invention provides a high-viscosity spray slurry screening device, which aims to solve the problems of low slurry screening efficiency and screen mesh blockage that is difficult to clean.

[0005] The technical solution includes a box-type screening chamber. A feed pipe is connected to the top of the screening chamber, with a feeding auger at the outer end of the feed pipe. A discharge pipe is connected to the bottom of the screening chamber. A horizontal screen assembly is located in the middle of the screening chamber, dividing it into an upper chamber and a lower chamber. Both the feed pipe and the discharge pipe have a U-shaped storage bend in their middle sections. During continuous feeding, the material in the storage bend of the feed pipe seals the feed pipe. During continuous discharge, the material in the storage bend of the discharge pipe seals the discharge pipe, preventing outside air from entering the screening chamber and creating an independent air chamber. A first air pipe is installed on the side wall of the screening chamber. The upper end of the first air pipe connects to the upper chamber of the screening chamber, and the lower end connects to the lower chamber. A first air pump is installed on the first air pipe. When the first air pump is activated, it pumps air from the lower chamber of the screening chamber to the upper chamber.

[0006] A second air pipe is installed on the side wall of the screening chamber. The upper end of the second air pipe is connected to the upper chamber of the screening chamber, and the lower end of the second air pipe is connected to the lower chamber of the screening chamber. A second air pump is installed on the second air pipe. When the second air pump is activated, it pumps the air in the upper chamber of the screening chamber to the lower chamber.

[0007] The screen assembly comprises a four-layer structure: a first horizontal mesh layer, a second horizontal mesh layer, a first vertical mesh layer, and a second vertical mesh layer. Each mesh layer consists of a rectangular frame and several steel wires arranged at equal intervals and fixed to the bottom of the frame. The steel wires of the first and second horizontal mesh layers are both along the left-right direction, and the steel wires of the first and second vertical mesh layers are both along the front-back direction. The steel wires of each mesh layer are evenly spaced. The first and second horizontal mesh layers are stacked to form a composite horizontal mesh layer with half the steel wire spacing. The first and second vertical mesh layers are stacked to form a composite vertical mesh layer with half the steel wire spacing. The composite horizontal mesh layer and the composite vertical mesh layer are stacked to form a cross-shaped screen assembly.

[0008] The frame has several equidistant through holes on a set of opposite sides. Each through hole on one side is screwed with a bolt at its upper end. The bolt axis is hollow. A steel wire passes through the through hole from top to bottom on the side without the bolt and is tied with a knot at the upper end of the through hole for positioning. The other end of the steel wire is pulled horizontally from the bottom of the frame to the opposite side and passes through the through hole and bolt on the opposite side from bottom to top. Then, a knot is tied at the upper end of the bolt for positioning.

[0009] The side lengths of the borders of the first horizontal mesh layer, the second horizontal mesh layer, the first vertical mesh layer, and the second vertical mesh layer decrease progressively. The four borders can be nested into four layers, with the borders of adjacent layers fitting together and the steel wires of adjacent layers fitting together.

[0010] The inner wall of the screening chamber is provided with an annular first support platform. The frame of the first horizontal mesh layer is placed on the first support platform. Except for the frame of the second vertical mesh layer, which is the innermost frame, the bottom of the inner wall of the other three frames is provided with an annular second support platform. Except for the frame of the first horizontal mesh layer, which is the outermost frame, the bottom of the outer wall of the other three frames is provided with an annular groove. When the four frames are nested, the second support platform on the outer frame is embedded in the annular groove on the inner frame.

[0011] The screening chamber is equipped with an openable top plate at the top. The three inner frames are connected to the top plate by pull ropes, and the length of the pull ropes increases gradually from the inside to the outside.

[0012] Both of the aforementioned storage bends have a discharge port at their bottom, and the discharge port is sealed with an end cap.

[0013] This invention can accelerate the flow of slurry through positive and negative pressure differences, thereby improving screening efficiency or clearing clogged mesh holes; the four-layer composite screen assembly can easily allow aggregate stuck in the mesh holes to fall off on its own, making it convenient to clean the screen assembly. Attached Figure Description

[0014] Figure 1 This is a front sectional view of the present invention.

[0015] Figure 2 This is a front sectional view of the present invention after the layers are separated.

[0016] Figure 3 for Figure 1 A magnified view of position A in the middle.

[0017] Figure 4 This is the front sectional view of the second horizontal grid layer.

[0018] Figure 5 This is a schematic diagram of a four-layer mesh screen assembly.

[0019] Figure 6 This is a top view of the screen assembly; in the figure, the thin solid lines represent the first horizontal mesh layer wires, the thin double-dotted lines represent the second horizontal mesh layer wires, the thin single-dotted lines represent the first vertical mesh layer wires, and the thin dashed lines represent the second vertical mesh layer wires. Detailed Implementation

[0020] Referring to the accompanying drawings, the present invention includes a box-type screening chamber 1. A feed pipe 2 is connected to the top of the screening chamber 1, and a feeding auger is connected to the outer end of the feed pipe 2. A discharge pipe 4 is connected to the bottom of the screening chamber 1. A horizontal screen assembly 5 is provided in the middle of the screening chamber 1, dividing the screening chamber 1 into an upper chamber and a lower chamber. The spray slurry to be screened is fed in through the feed pipe 2, screened by the screen assembly 5, and discharged through the discharge pipe 4. Both the feed pipe 2 and the discharge pipe 4 have a U-shaped storage bend 6 in their middle sections. During continuous feeding, the material in the storage bend 6 of the feed pipe 2 seals the feed pipe 2; during continuous discharge, the material in the storage bend 6 of the discharge pipe 4 seals the discharge pipe 4, thus preventing outside air from entering the screening chamber 1. The screening chamber 1 has a [missing information - likely a specific shape or structure]. It forms an independent air chamber; a first air pipe 7 is installed on the side wall of the screening chamber 1. The upper end of the first air pipe 7 is connected to the upper chamber of the screening chamber 1, and the lower end of the first air pipe 7 is connected to the lower chamber of the screening chamber 1. A first air pump 8 is installed on the first air pipe 7. When the first air pump 8 is started, it pumps the air in the lower chamber of the screening chamber 1 to the upper chamber. During screening, the first air pump 8 is started. Due to the high viscosity and poor fluidity of the slurry, the permeability of the screen assembly 5 is poor, and the air pressure balance between the upper and lower chambers is slow. When the first air pump 8 is started, it pumps the air in the lower chamber to the upper chamber, thereby increasing the air pressure in the upper chamber and decreasing the air pressure in the lower chamber. A pressure difference is formed from top to bottom on both sides of the screen assembly 5, which accelerates the speed of the slurry passing through the screen assembly 5, thereby improving the screening efficiency.

[0021] A second air pipe 9 is installed on the side wall of the screening chamber 1. The upper end of the second air pipe 9 is connected to the upper chamber of the screening chamber 1, and the lower end of the second air pipe 9 is connected to the lower chamber of the screening chamber 1. A second air pump 10 is installed on the second air pipe 9. When the second air pump 10 is started, it pumps the air in the upper chamber of the screening chamber 1 to the lower chamber. When the mesh of the screen assembly 5 is blocked by slurry accumulation, the first air pump 8 is turned off and the second air pump 10 is started, and the feeding speed is slowed down or the feeding is stopped. The pressure difference is converted to downward. As the slurry seeps down through the screen assembly 5, the slurry will bubble upward and burst, thereby clearing the mesh.

[0022] The screen assembly 5 comprises a four-layer structure: a first horizontal mesh layer 11, a second horizontal mesh layer 12, a first vertical mesh layer 13, and a second vertical mesh layer 14. Each mesh layer consists of a rectangular frame 15 and several steel wires 16 arranged at equal intervals and fixed to the bottom of the frame 15. The steel wires 16 of the first horizontal mesh layer 11 and the second horizontal mesh layer 12 are both along the left-right direction, while the steel wires 16 of the first vertical mesh layer 13 and the second vertical mesh layer 14 are both along the front-back direction. The spacing between the steel wires 16 in each mesh layer is the same. The first horizontal mesh layer 11 and the second horizontal mesh layer 12 are stacked to form a single steel wire 16. A composite horizontal mesh layer 17 with half the spacing, a first vertical mesh layer 13, and a second vertical mesh layer 14 are stacked together to form a composite vertical mesh layer 18 with half the spacing of the steel wires 16. The composite horizontal mesh layer 17 and the composite vertical mesh layer 18 are stacked together to form a cross-shaped screen assembly 5. The side length of the mesh opening of the screen assembly 5 is half the spacing of the steel wires 16 in a single mesh layer. The screen assembly 5 with a specific mesh size composed of four mesh layers can perform the required particle size screening. After the four mesh layers are separated, the spacing of the steel wires 16 is doubled, and the material trapped in the mesh openings during screening can fall off, thus facilitating screen cleaning and preventing the mesh openings from being blocked.

[0023] The frame 15 has several equidistant through holes 19 on a set of opposite sides. Each through hole 19 on one side is screwed with a bolt 20 at its upper end. The bolt 20 is hollow at its axis. A steel wire 16 passes through the through hole 19 on the side without the bolt 20 from top to bottom and is tied with a knot at the upper end of the through hole 19 for positioning. The other end of the steel wire 16 is pulled horizontally from the bottom of the frame 15 to the opposite side and passes through the opposite through hole 19 and bolt 20 from bottom to top. Then, a knot is tied at the upper end of the bolt 20 for positioning. The two ends of the steel wire 16 can also be spot welded for fixation. The steel wire 16 can be straightened by adjusting the tension of the steel wire 16 by turning the bolt 20.

[0024] The side lengths of the borders 15 of the first horizontal mesh layer 11, the second horizontal mesh layer 12, the first vertical mesh layer 13, and the second vertical mesh layer 14 decrease progressively. The four borders 15 can be nested into four layers, with the borders 15 of adjacent layers fitting together and the steel wires 16 of adjacent layers fitting together, thus forming a stable and compact four-layer composite screen assembly 5.

[0025] The inner wall of the screening chamber 1 is provided with an annular first support platform 21. The frame 15 of the first horizontal mesh layer 11 is placed on the first support platform 21. Except for the frame 15 of the second vertical mesh layer 14, which is the innermost frame 15, the bottom of the inner wall of the other three frame 15 is provided with an annular second support platform 22. Except for the frame 15 of the first horizontal mesh layer 11, which is the outermost frame 15, the bottom of the outer wall of the other three frame 15 is provided with an annular groove 23. When the four frames 15 are nested, the second support platform 22 on the outer frame 15 is embedded in the annular groove 23 on the inner frame 15, supporting the inner frame 15 and ensuring that there is no height difference between the frames 15, so that the steel wires 16 of each layer can be completely attached.

[0026] The screening chamber 1 is equipped with an openable top plate 24 at its upper end. The three inner frame frames 15 are connected to the top plate 24 by pull ropes 25. The length of the pull ropes 25 increases gradually from the inside to the outside. When the top plate 24 is lifted and opened, the three frame frames 15 will be pulled up by the pull ropes 25, thereby separating the four mesh layers at equal intervals. Then, a water gun is used to clean each mesh layer.

[0027] Both of the aforementioned material storage bends 6 have a discharge port 26 at their bottom, and the discharge port 26 is sealed with an end cap 27. Opening the end cap 27 can drain the material stored in the material storage bend 6, and the discharge port 26 can be used to unclog the feed pipe 2 or the discharge pipe 4 or clean the inner wall.

[0028] In use, the material is fed into the screening chamber 1 through the feed pipe 2, and discharged through the discharge pipe 4 after being screened by the screening components. During continuous feeding and discharging, the material in the storage bends 6 of the feed pipe 2 and the discharge pipe 4 seals the feed pipe 2 and the discharge pipe 4, preventing outside air from entering the screening chamber 1, thus forming a relatively closed air cavity inside the screening chamber 1. During screening, the first air pump 8 is started, and the first air pump 8 draws air from the lower chamber to the upper chamber. Due to the high viscosity and poor fluidity of the slurry, the permeability of the screen assembly 5 is poor, and the air pressure balance between the upper and lower chambers is slow, thereby increasing the air pressure in the upper chamber and decreasing the air pressure in the lower chamber. A pressure difference is formed from top to bottom on both sides of the screen assembly 5, which accelerates the speed at which the slurry passes through the screen assembly 5, thereby improving the screening efficiency.

[0029] When the mesh of the screen assembly 5 is clogged by slurry accumulation, the first air pump 8 is turned off and the second air pump 10 is started, and the feeding speed is slowed down or stopped. The pressure difference is converted to upward, and as the slurry seeps down through the screen assembly 5, it bubbles and bursts upward, thereby clearing the mesh.

[0030] After screening, open the end caps 27 at the bottom of the two storage bends 6 to discharge the retained material in the storage bends 6 from the discharge port 26. The inside of the feed pipe 2 and the discharge pipe 4 can also be cleaned through the discharge port 26.

[0031] When the mesh of the screen assembly 5 is clogged by aggregate particles, the top plate 24 is lifted upwards. The top plate 24 can be driven by an electric telescopic rod of a cylinder. The top rod lifts each frame 15 through the pull rope 25. Since the pull rope 25 of each frame 15 is of different lengths, the multiple frames 15 after being lifted are separated by a certain distance, thereby separating the layers of steel wires 16. The distance between the separated layers of steel wires 16 is equal to twice the side length of the mesh of the screen assembly 5. Therefore, the aggregate stuck between the steel wires 16 will fall off by itself. The mesh layers can be washed with a water gun from the top of the screening chamber 1.

[0032] This invention forms a relatively closed air chamber in the screening chamber 1 while continuously feeding and discharging material through the material storage bend 6. A pressure difference is created on the upper and lower sides of the screen assembly 5 by an air pump. The positive pressure difference can accelerate the discharge of slurry and improve screening efficiency, while the negative pressure difference can clear the stuck mesh holes. Moreover, in the four-layer composite screen assembly 5, after separation, the spacing of the steel wires 16 of each mesh layer is equal to twice the side length of the mesh hole during screening. The aggregate stuck in the mesh hole will fall off by itself, which is convenient for cleaning the screen assembly 5.

Claims

1. A high-viscosity spray slurry screening device, comprising a box-type screening chamber (1), a feed pipe (2) connected to the top of the screening chamber (1), a feeding auger connected to the outer end of the feed pipe (2), a discharge pipe (4) connected to the bottom of the screening chamber (1), and a horizontal screen assembly (5) provided in the middle of the screening chamber (1), the screen assembly (5) dividing the screening chamber (1) into an upper chamber and a lower chamber, characterized in that, Both the feed pipe (2) and the discharge pipe (4) have a U-shaped storage bend (6) in the middle section. When feeding continuously, the material in the storage bend (6) of the feed pipe (2) seals the feed pipe (2). When discharging continuously, the material in the storage bend (6) of the discharge pipe (4) seals the discharge pipe (4), so that outside air cannot enter the screening chamber (1) and an independent air chamber is formed in the screening chamber (1). A first air pipe (7) is installed on the side wall of the screening chamber (1). The upper end of the first air pipe (7) is connected to the upper chamber of the screening chamber (1), and the lower end of the first air pipe (7) is connected to the lower chamber of the screening chamber (1). A first air pump (8) is installed on the first air pipe (7). When the first air pump (8) is started, it pumps the air in the lower chamber of the screening chamber (1) to the upper chamber. The screen assembly (5) includes a four-layer structure, namely a first horizontal mesh layer (11), a second horizontal mesh layer (12), a first vertical mesh layer (13), and a second vertical mesh layer (14). Each mesh layer consists of a rectangular frame (15) and several steel wires (16) arranged at equal intervals and fixed at the bottom of the frame (15). The side lengths of the borders (15) of the first horizontal mesh layer (11), the second horizontal mesh layer (12), the first vertical mesh layer (13), and the second vertical mesh layer (14) decrease progressively. The four borders (15) can be nested into four layers, and after nesting, the borders (15) of adjacent layers are attached, and the steel wires (16) of adjacent layers are attached. The screening chamber (1) is provided with an openable top plate (24) at the top end. The three inner frame sides (15) are connected to the top plate (24) by pull ropes (25). The length of the pull ropes (25) increases gradually from the inside to the outside.

2. The high-viscosity spray slurry screening device according to claim 1, characterized in that, A second air pipe (9) is installed on the side wall of the screening chamber (1). The upper end of the second air pipe (9) is connected to the upper chamber of the screening chamber (1), and the lower end of the second air pipe (9) is connected to the lower chamber of the screening chamber (1). A second air pump (10) is installed on the second air pipe (9). When the second air pump (10) is started, it pumps the air in the upper chamber of the screening chamber (1) to the lower chamber.

3. The high-viscosity spray slurry screening device according to claim 1, characterized in that, The steel wires (16) of the first horizontal mesh layer (11) and the second horizontal mesh layer (12) are both along the left and right direction, and the steel wires (16) of the first vertical mesh layer (13) and the second vertical mesh layer (14) are both along the front and back direction. The steel wires (16) of each mesh layer are distributed at the same distance. After the first horizontal mesh layer (11) and the second horizontal mesh layer (12) are stacked together, a composite horizontal mesh layer (17) with the steel wire (16) spacing halved is formed. After the first vertical mesh layer (13) and the second vertical mesh layer (14) are stacked together, a composite vertical mesh layer (18) with the steel wire (16) spacing halved is formed. After the composite horizontal mesh layer (17) and the composite vertical mesh layer (18) are stacked together, a cross-shaped screen assembly (5) is formed.

4. The high-viscosity spray slurry screening device according to claim 3, characterized in that, The frame (15) has several equally spaced through holes (19) on a set of opposite sides. Each through hole (19) on one side is screwed with a bolt (20) at the upper end. The bolt (20) is hollow at its axis. A steel wire (16) passes through the through hole (19) from top to bottom on the side without the bolt (20) and is tied with a knot at the upper end of the through hole (19) for limitation. The other end of the steel wire (16) is pulled horizontally from the bottom of the frame (15) to the opposite side and passes through the through hole (19) and bolt (20) on the opposite side from bottom to top. Then, a knot is tied at the upper end of the bolt (20) for limitation.

5. A high-viscosity spray slurry screening device according to claim 1, characterized in that, The inner wall of the screening chamber (1) is provided with an annular first support platform (21). The frame (15) of the first horizontal mesh layer (11) is placed on the first support platform (21). Except for the frame (15) of the second vertical mesh layer (14), which is the innermost frame (15), the bottom of the inner wall of the other three frames (15) is provided with an annular second support platform (22). Except for the frame (15) of the first horizontal mesh layer (11), which is the outermost frame (15), the bottom of the outer wall of the other three frames (15) is provided with an annular groove (23). When the four frames (15) are nested, the second support platform (22) on the outer frame (15) is embedded in the annular groove (23) on the inner frame (15).

6. The high-viscosity spray slurry screening device according to claim 1, characterized in that, Both of the aforementioned storage bends (6) have a discharge port (26) at their bottom, and the discharge port (26) is closed with an end cap (27).

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