Steel shot screening device

Abstract

The present invention provides a steel sand screening device, which includes a hollow pressure-bearing housing. The pressure-bearing housing includes: a top part provided with an installation opening, a bottom part provided with a sand discharge opening, and a side wall located between the top part and the bottom part. A swirling inlet is provided on the side wall, and the swirling inlet is connected to an inlet acceleration conduit for swirling and transporting sewage into the pressure-bearing housing. A central diversion pipe is provided inside the pressure-bearing housing, and a diversion cone plate is provided between the central diversion pipe and the sand discharge opening. The diversion cone plate is provided with diversion holes. The present invention can make the sewage generate a swirl and then use centrifugal force to separate steel sand, and can further remove suspended impurities in the steel sand. It separates and recovers the steel sand in the sewage by mechanical means, and has the advantages of high separation efficiency, simple and reliable structure, and convenient operation.

Description

Technical Field

[0001] The present invention relates to the technical field of solid-liquid separation equipment, and particularly to a steel sand screening device. Background Art

[0002] In the process of pickling strip steel without acid in the cold rolling workshop of iron and steel enterprises, wet steel sand rust removal needs to be carried out on the steel plate. Wet steel sand rust removal is to use liquid to drive steel sand to spray onto the surface of the strip steel at high speed, thereby removing the rust on the surface of the strip steel. A large amount of sewage will be generated during the wet steel sand rust removal process, and the sewage is mixed with steel sand and iron filings, iron oxide powder, etc. generated during the rust removal process. In order to reduce the consumption of steel sand and the cost of steel sand rust removal, it is necessary to recycle the steel sand in the sewage. Summary of the Invention

[0003] In order to overcome the above-mentioned defects of the prior art, the technical problem to be solved by the embodiments of the present invention is to provide a steel sand screening device, which can make the sewage generate a swirl and then use centrifugal force to separate the steel sand, and can further remove the suspended impurities in the steel sand. It uses a mechanical method to separate and recycle the steel sand in the sewage, and has the advantages of high separation efficiency, simple and reliable structure, convenient operation, etc.

[0004] The above object of the present invention can be achieved by the following technical solutions. The present invention provides a steel sand screening device, and the steel sand screening device includes a hollow pressure-bearing housing, and the pressure-bearing housing includes: a top provided with an installation port, a bottom provided with a sand discharge port, and a side wall located between the top and the bottom. A swirl inlet is provided on the side wall, and the swirl inlet is docked with an inlet acceleration conduit for rotatingly transporting sewage into the pressure-bearing housing.

[0005] A central guide pipe is provided in the pressure-bearing housing. The central guide pipe is at least partially installed in the pressure-bearing housing through the installation port. The central guide pipe has a first end close to the bottom and a second end close to the top. The first end is arranged above the sand discharge port, and the second end is provided with a water outlet. A guide cone plate is provided between the central guide pipe and the sand discharge port, and the guide cone plate is provided with guide holes.

[0006] In a preferred embodiment of the present invention, the inlet acceleration conduit includes a first pipe section connected to the swirl inlet, and the first pipe section extends longitudinally along the tangent direction of the side wall.

[0007] In a preferred embodiment of the present invention, at least one vertical partition is provided in the first pipe section, and the longitudinal extension direction of the vertical partition is the same as the extension direction of the first pipe section. The first pipe section is divided into two or more independent laminar flow channels by the vertical partition.

[0008] In a preferred embodiment of the present invention, a plurality of vertical partitions are provided. The plurality of vertical partitions are evenly spaced at the same height within the first pipe section to form a plurality of independent laminar flow channels.

[0009] In a preferred embodiment of the present invention, the cross-section of the first pipe section is rectangular.

[0010] In a preferred embodiment of the present invention, the laminar flow channels are parallel to the axis of the side wall and the tangential direction.

[0011] In a preferred embodiment of the present invention, the first pipe section has a first end connected to the swirling inlet, and a second end opposite to the first end. The second end is sequentially connected to a variable-diameter acceleration section, a second pipe section, and a water inlet port. The pipe section of the variable-diameter acceleration section is narrowed from the second pipe section to the first pipe section.

[0012] In a preferred embodiment of the present invention, the top includes an upper head, the side wall includes a middle swirling cylinder, the bottom includes a lower conical cylinder. The installation opening is provided on the upper head, the swirling inlet is provided on the middle swirling cylinder, the sand discharge port is provided on the lower conical cylinder. A sand storage chamber is provided inside the lower conical cylinder, and the sand discharge port is communicated with the sand storage chamber.

[0013] In a preferred embodiment of the present invention, a flow stabilizer plate is provided inside the pressure-bearing housing. A plurality of flow stabilizing through holes are provided on the flow stabilizer plate. The flow stabilizer plate is provided above the swirling inlet, and the pressure-bearing housing is divided into an upper static water area and a lower swirling separation area by the flow stabilizer plate.

[0014] In a preferred embodiment of the present invention, the plurality of flow stabilizing through holes are evenly spaced and arranged on the flow stabilizer plate.

[0015] In a preferred embodiment of the present invention, the aperture of the diversion hole is 25 mm - 50 mm.

[0016] The technical solution of the present invention has the following remarkable beneficial effects:

[0017] During the separation process, the steel sand screening device of the present invention can accelerate the sewage to a set flow rate by using the water inlet acceleration conduit, and can rotate and transport the sewage into the pressure-bearing housing. The rotating sewage in the pressure-bearing housing makes the steel sand in the sewage slide along the inner wall of the pressure-bearing housing into the sand storage chamber by centrifugal force, and then is discharged and recycled through the sand discharge port.

[0018] During the drainage process, the separated sewage is discharged from bottom to top along the central guide pipe. During this process, the sewage on both sides of the diversion cone plate can generate a pressure difference through the diversion cone plate. By using this pressure difference, the sewage and its suspended impurities in the sand storage chamber can flow into the central guide pipe along the diversion holes. The conical structure of the diversion cone plate can amplify the capture effect on the suspended impurities, further improving the purity of the precipitated steel sand in the sand storage chamber. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the following will briefly introduce the drawings required for the description of the embodiments. Obviously, the following drawings are only some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0020] The drawings described herein are only for the purpose of explanation and are not intended to limit the scope of the disclosure of the present invention in any way. In addition, the shapes and proportional dimensions of the components in the drawings are only schematic and are used to assist in understanding the present invention, rather than specifically limiting the shapes and proportional dimensions of the components of the present invention. Those skilled in the art can select various possible shapes and proportional dimensions according to specific circumstances to implement the present invention under the teaching of the present invention.

[0021] Figure 1 is the front view sectional structure schematic diagram of the present invention;

[0022] Figure 2 is the side view sectional structure schematic diagram of the present invention;

[0023] Figure 3 is Figure 1 the sectional structure schematic diagram of A-A in

[0024] Figure 4 is the structure schematic diagram of the water inlet acceleration conduit;

[0025] Figure 5 is Figure 4 the sectional structure schematic diagram of B-B in

[0026] Figure 6 is Figure 5 the sectional structure schematic diagram of C-C in

[0027] Figure 7 is the installation structure schematic diagram of the diversion cone plate;

[0028] Figure 8 is the installation top view structure schematic diagram of the diversion cone plate;

[0029] Figure 9 is the sectional structure schematic diagram of the diversion cone plate;

[0030] Figure 10 It is a schematic top view structure diagram of the steady flow plate.

[0031] Reference numerals in the above drawings:

[0032] 1. Pressure-bearing housing; 11. Upper head; 111. Installation opening; 12. Middle cyclone cylinder; 121. Cyclone inlet; 13. Lower conical cylinder; 131. Sand discharge port; 132. Sand storage chamber;

[0033] 2. Water inlet acceleration conduit; 21. First pipe section; 22. Reducing acceleration section; 23. Second pipe section; 231. Water inlet port; 24. Vertical partition; 25. Laminar flow channel;

[0034] 3. Central guide pipe; 31. Outlet;

[0035] 4. Guide cone plate; 41. Guide hole;

[0036] 5. Fixed steel plate;

[0037] 6. Steady flow plate; 61. Steady flow through hole; 62. Upper static water area; 63. Lower cyclone separation area. Specific implementation mode

[0038] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0039] A large amount of sewage mixed with steel sand will be generated during the wet steel sand rust removal process, and the steel sand in these sewage can be collected and reused. This application mainly uses the principle of mechanical separation to collect the steel sand in the sewage.

[0040] In an embodiment of the present application, a steel sand screening device is provided. The steel sand screening device includes a hollow pressure-bearing housing 1, and the pressure-bearing housing 1 includes: a top provided with an installation opening 111, a bottom provided with a sand discharge opening 131, and a side wall located between the top and the bottom. A swirling inlet 121 is provided on the side wall, and the swirling inlet 121 is connected to an inlet acceleration conduit 2 for swirling and transporting sewage into the pressure-bearing housing 1. A central guide pipe 3 is provided in the pressure-bearing housing 1. The central guide pipe 3 is at least partially installed in the pressure-bearing housing 1 through the installation opening 111. The central guide pipe 3 has a first end close to the bottom and a second end close to the top. The first end is arranged above the sand discharge opening 131, and the second end is provided with a water outlet 31. A guide cone plate 4 is provided between the central guide pipe 3 and the sand discharge opening 131, and the guide cone plate 4 is provided with a guide hole 41.

[0041] Overall, the steel sand screening device provided by the present application mainly separates steel sand in sewage by generating centrifugal force through swirling flow. It can quickly treat sewage to obtain steel sand with a high purity, and these steel sands can be used again in the wet steel sand rust removal process.

[0042] In the specification of the present application, it will be elaborated in detail in combination with specific embodiments and drawings.

[0043] Specifically, please refer to Figures 1 to 10 , the steel sand screening device may include: a pressure-bearing housing 1; an inlet acceleration conduit 2; a central guide pipe 3; a guide cone plate 4; a fixed steel plate 5; a flow stabilizing plate 6.

[0044] Among them, before use, a part of the water body needs to be pre-installed inside the pressure-bearing housing 1. The pre-installed water body needs to exceed the swirling inlet 121 at least. The pre-installed water body can enhance the swirling flow stability inside the pressure-bearing housing 1 and reduce the turbulent flow caused by air.

[0045] In addition, when in use, when the inlet acceleration conduit 2 pressurizes and transports the sewage to be treated into the pressure-bearing housing 1, the fluid separated from the steel sand inside the pressure-bearing housing 1 will be forced out upwards through the central guide pipe 3 against gravity. Therefore, a certain pressure needs to be maintained inside the pressure-bearing housing 1.

[0046] Specifically, the pressure-bearing housing 1 includes: a top provided with an installation opening 111, a bottom provided with a sand discharge opening 131, and a side wall located between the top and the bottom. The top includes an upper head 11, and the installation opening 111 is provided on the upper head 11. The upper head 11 adopts an arc transition structure, and this arc structure has better pressure-bearing performance compared with the plate-shaped structure.

[0047] The side wall includes a middle cyclone cylinder 12, and the swirling inlet 121 can be arranged on the middle cyclone cylinder 12. Specifically, the side wall of the pressure-bearing housing 1 needs to be set in a shape conducive to swirling. For example, in this embodiment, the side wall is the inner wall of the middle cyclone cylinder 12. The cross-sectional shape of the side wall is set to be circular, which can reduce the swirling resistance. Of course, as other deformation implementation manners of the side wall, it can also be set to be spiral on the side wall, or the side wall can be set to other shapes with a smooth transition curve. In this embodiment, the circular shape is mainly taken as an example, and the setting manner of the side wall shape is not limited thereto.

[0048] The bottom includes a lower conical cylinder 13, and the sand discharge port 131 is arranged on the lower conical cylinder 13. A sand storage chamber 132 is arranged inside the lower conical cylinder 13, and the sand discharge port 131 is communicated with the sand storage chamber 132.

[0049] Compared with a cylindrical structure with a constant cross-section, when they have the same liquid level, the bottom pressure of the lower conical cylinder 13 is the same as that of the cylindrical structure, but the lower conical cylinder 13 has a smaller surface area than the cylindrical structure. Therefore, the weight of the pressure-bearing housing 1 can be reduced. And the conical structure of the lower conical cylinder 13 can more conveniently gather steel sand.

[0050] The water inlet acceleration conduit 2 is used to rotate and convey sewage into the pressure-bearing housing 1. The water inlet acceleration conduit 2 is docked on the swirling inlet 121. Among them, the specific docking manner between the water inlet acceleration conduit 2 and the swirling inlet 121 can be welding, or can be integrally formed. In addition, it can also be snap connection, or threaded connection, etc. When using detachable connection methods such as snap connection and threaded connection, in order to ensure the sealing performance of the connection position, a sealing member can be added at the docking position. Of course, the docking method is not limited to the above examples, and those skilled in the art can make a reasonable selection according to actual needs, and this application does not make specific limitations here.

[0051] For example, in this embodiment, the water inlet acceleration conduit 2 and the swirling inlet 121 are connected by welding. Through the welding connection, the water inlet acceleration conduit 2 has stronger stability and can stably rotate and convey water into the pressure-bearing housing 1.

[0052] The water inlet acceleration conduit 2 can include a first pipe section 21 connected to the swirling inlet 121, and the first pipe section 21 extends longitudinally along the tangent direction of the side wall. Among them, the first pipe section 21 has a first end connected to the swirling inlet 121 and a second end opposite to the first end. The relative position of the first end and the swirling inlet 121: completely matched, or the first end extends into the pressure-bearing housing 1 through the swirling inlet 121.

[0053] The second end is sequentially connected to a diameter-varying acceleration section 22, a second pipe section 23, and a water inlet port 231. The pipe section of the diameter-varying acceleration section 22 is arranged to narrow from the second pipe section 23 towards the first pipe section 21.

[0054] By arranging the second pipe section 23 to narrow towards the first pipe section 21, the diameter of the second pipe section 23 is made larger than that of the first pipe section 21. Thus, when the water flow flows from the second pipe section 23 into the first pipe section 21, it is accelerated. Therefore, by coordinating with the water inlet speed of the diameter-varying acceleration section 22 and the water inlet port 231, the sewage can reach the set flow rate.

[0055] The swirling inlet 121 is arranged at a position close to the top, so that a longer swirling separation distance can be obtained inside the side wall, enabling the steel sand to be fully separated from the sewage under the action of centrifugal force.

[0056] During specific use, the water inlet acceleration conduit 2 can accelerate the sewage to the set flow rate and can convey the sewage into the pressure-bearing housing 1 in a swirling manner. The rotating sewage in the pressure-bearing housing 1 causes the steel sand in the sewage to slide along the inner wall of the pressure-bearing housing 1 into the sand storage chamber 132 under the action of centrifugal force, and then is discharged and recycled through the sand discharge port 131. Among them, the purpose of reaching the set flow rate is: using different flow rates to generate different centrifugal forces to separate steel sand of different particle sizes through different centrifugal forces. When the flow rate is fast, a greater centrifugal force can be generated, and thus steel sand with a smaller particle size can be separated; when the flow rate is slow, the generated centrifugal force is small, and steel sand with a larger particle size can be separated. By presetting the corresponding relationship between the steel sand particle size and the water inlet speed, during use, the water inlet speed can be directly adjusted according to the particle size of the target steel sand to separate the target steel sand.

[0057] Moreover, in order to enable the sewage to reach a more stable flow state when rotating around the central guide pipe 3 in the pressure-bearing housing 1 and further improve the centrifugal effect. At least one vertical partition 24 is provided in the first pipe section 21. The longitudinal extension direction of the vertical partition 24 is the same as the extension direction of the first pipe section 21. The first pipe section 21 is divided into two or more independent laminar flow channels 25 by the vertical partition 24. Specifically, the laminar flow channels 25 are parallel to the axis of the side wall and the tangential direction.

[0058] In order to make the laminar flow channels 25 fit the side wall better to achieve a better flow stabilizing effect, the cross-section of the first pipe section 21 is rectangular. The first pipe section 21 adopting a rectangular cross-section setting method can make the laminar flow channels 25 parallel to the tangential direction of the side wall, enabling the sewage to enter the pressure-bearing housing 1 by fitting the side wall, reducing the disturbance during the sewage flow process, further improving the flow stability of the sewage in the pressure-bearing housing 1, and making the solid-liquid separation effect better.

[0059] Among them, at least one vertical partition 24 means that it can be one, two, or more. The specific number of vertical partitions 24 can be determined according to the actual pipe diameter size, etc. When multiple vertical partitions 24 are provided, the multiple vertical partitions 24 are evenly spaced at the same height in the first pipe section 21 to form multiple independent laminar flow channels 25. For example, when two vertical partitions 24 are provided, the two vertical partitions 24 are evenly spaced at the same height in the first pipe section 21 to form three independent laminar flow channels 25. Through the independent laminar flow channels 25, sewage can enter the pressure-bearing housing 1 in a laminar state, which is beneficial to the sewage reaching a more stable flow state when rotating around the central guide pipe 3 in the pressure-bearing housing 1.

[0060] The central guide pipe 3 includes a first end near the bottom and a second end near the top. The second end is provided with a water outlet 31, and through this water outlet 31, the treated sewage in the pressure-bearing housing 1 can be discharged. Specifically, the installation opening 111 is provided at the top of the pressure-bearing housing 1, and the size of the installation opening 111 matches the pipe diameter of the central guide pipe 3. Through the installation opening 111, at least part of the central guide pipe 3 can be installed in the pressure-bearing housing 1.

[0061] Among them, at least part of the central guide pipe 3 being installed in the pressure-bearing housing 1 means that part of the central guide pipe 3 is installed in the pressure-bearing housing 1, so that the second end of the central guide pipe 3 is located above the pressure-bearing housing 1. Or the central guide pipe 3 is entirely installed in the pressure-bearing housing 1, so that the second end of the central guide pipe 3 is connected to the top of the pressure-bearing housing 1. For example, in this embodiment, part of the central guide pipe 3 is installed in the pressure-bearing housing 1, so that the axis of the central guide pipe 3 is collinear with the axis of the side wall. A flange is provided at the second end of the central guide pipe 3, and through the flange, it is more convenient to connect to the drain pipe, which is beneficial to discharging the treated sewage.

[0062] The flow guiding cone plate 4 is arranged below the central guide pipe 3 and above the sand storage chamber 132. The flow guiding cone plate 4 has a conical structure, and the aperture of the flow guiding hole 41 can be set to 25 mm - 50 mm. Designers can reasonably set the size of the flow guiding hole 41 according to requirements, and there is no limit here.

[0063] Multiple fixing steel plates 5 are provided for fixedly installing the flow guiding cone plate 4. Specifically, the flow guiding cone plate 4 can be fixedly connected to the central guide pipe 3 through multiple fixing steel plates 5 arranged radially. For example, in this embodiment, 4 fixing steel plates 5 are used, and the 4 fixing steel plates 5 are arranged at annular intervals. One end of the fixing steel plate 5 is connected to the flow guiding cone plate 4, and the other end of the fixing steel plate 5 is connected to the central guide pipe 3. Of course, designers can also reasonably select other fixing and installation methods, and there is no limit here.

[0064] During specific use, when the central guide pipe 3 drains water, a hydraulic pressure difference will be generated on both sides of the guide cone plate 4. Through this hydraulic pressure difference, the sewage in the sand storage chamber 132 can rise along the guide cone plate 4 and enter the central guide pipe 3 for drainage. During this process, the suspended impurities in the sand storage chamber 132 are carried upward by the water flow and introduced into the central guide pipe 3 along the guide cone plate 4, preventing the suspended impurities from mixing into the separated steel sand or returning to the sewage due to turbulent flow.

[0065] The flow stabilizer plate 6 is arranged in the pressure-bearing housing 1. The flow stabilizer plate 6 is arranged above the swirl inlet 121. The pressure-bearing housing 1 is divided into an upper static water area 62 and a lower swirl separation area 63 by the flow stabilizer plate 6. A plurality of flow stabilizing through holes 61 are provided on the flow stabilizer plate 6. Specifically, the flow stabilizer plate 6 can be arranged between the upper end head 11 and the middle swirl cylinder 12. The plurality of flow stabilizing through holes 61 are arranged at equal intervals on the flow stabilizer plate 6. The upper static water area 62 and the lower swirl separation area 63 are connected through the flow stabilizing through holes 61. Among them, when the flow stabilizer plate 6 is provided, the length of the central guide pipe 3 on the lower side of the flow stabilizer plate 6 is about 75% of the length of the middle swirl cylinder 12. Of course, the designer can set the aperture of the flow stabilizing through holes 61 and the number of the flow stabilizing through holes 61 according to the actual use situation, which is not limited here.

[0066] During specific use, the flow stabilizer plate 6 can reduce the water flow resistance at the swirl inlet 121, so that the sewage entering the pressure-bearing housing 1 forms a steady flow state. Through the flow stabilizing through holes 61 on the flow stabilizer plate 6, the pressure on both sides of the flow stabilizer plate 6 is balanced, and the thickness of the flow stabilizer plate 6 can be reduced.

[0067] When this embodiment works:

[0068] During the separation process, the steel sand screening device of the present application can accelerate the sewage to a set flow rate by using the water inlet acceleration conduit 2, and can rotate and transport the sewage into the pressure-bearing housing 1. The rotating sewage makes the steel sand in the sewage slide along the inner wall of the pressure-bearing housing 1 into the sand storage chamber 132 through centrifugal force, and then is discharged and recycled through the sand discharge port 131.

[0069] During the drainage process, the separated sewage is discharged from bottom to top along the central guide pipe 3. During this process, the sewage on both sides of the guide cone plate 4 can generate a pressure difference through the guide cone plate 4. By using this pressure difference, the sewage and its suspended impurities in the sand storage chamber 132 can flow into the central guide pipe 3 along the guide holes 41. The conical structure of the guide cone plate 4 can amplify the capture effect on the suspended impurities, and further improve the purity of the precipitated steel sand in the sand storage chamber 132.

[0070] Of course, multiple steel sand screening devices of the present invention can also be provided. The sewage discharged from one steel sand screening device can be transported into another steel sand screening device for another round of cyclone separation. A higher rotational speed can be adopted for the second round of cyclone separation to separate finer steel sand. In this way, series operation can screen and separate steel sand of different specifications and particle sizes. Designers can use multiple steel sand screening devices according to actual needs, which is not limited here.

[0071] The above are only several embodiments of the present invention. Those skilled in the art can make various changes or modifications to the embodiments of the present invention without departing from the spirit and scope of the present invention based on the content disclosed in the application documents.

Claims

1. A steel shot screening device, characterized in that, The steel grit screening device includes a hollow pressure-bearing housing, and the pressure-bearing housing includes: a top provided with an installation opening, a bottom provided with a sand discharge opening, and a side wall located between the top and the bottom. A swirl inlet is provided on the side wall, and an inlet acceleration conduit for rotatingly conveying sewage into the pressure-bearing housing is connected to the swirl inlet. A central diversion pipe is provided in the pressure-bearing housing. The central diversion pipe is at least partially installed in the pressure-bearing housing through the installation opening. The central diversion pipe has a first end near the bottom and a second end near the top. The first end is arranged above the sand discharge opening, and the second end is provided with a water outlet. A diversion cone plate is provided between the central diversion pipe and the sand discharge opening. The diversion cone plate is provided with diversion holes, and the aperture of the diversion holes is 25 mm - 50 mm. The inlet acceleration conduit includes a first pipe section connected to the swirl inlet, and the first pipe section longitudinally extends along the tangential direction of the side wall. At least one vertical partition is provided in the first pipe section, and the longitudinal extension direction of the vertical partition is the same as the extension direction of the first pipe section. The first pipe section is divided into two or more independent laminar flow channels by the vertical partition.

2. The steel shot screening device according to claim 1, characterized in that, A plurality of the vertical partitions are provided, and the plurality of vertical partitions are evenly spaced at the same height in the first pipe section to form a plurality of independent laminar flow channels.

3. The steel shot screening device according to any one of claims 1-2, characterized in that, The cross-section of the first pipe section is rectangular.

4. The steel shot screening device according to any one of claims 1-2, characterized in that, The laminar flow channels are parallel to the axis of the side wall and the tangential direction.

5. The steel shot screening device according to any one of claims 1-2, characterized in that, The first pipe section has a first end connected to the swirl inlet and a second end opposite to the first end. The second end is sequentially connected to a reduced-diameter acceleration section, a second pipe section, and a water inlet port. The pipe section of the reduced-diameter acceleration section is arranged to narrow from the second pipe section to the first pipe section.

6. The steel shot screening device according to any one of claims 1-2, characterized in that, The top includes an upper head, the side wall includes a middle swirl cylinder, the bottom includes a lower cone cylinder. The installation opening is provided on the upper head, the swirl inlet is provided on the middle swirl cylinder, the sand discharge opening is provided on the lower cone cylinder. A sand storage chamber is provided in the lower cone cylinder, and the sand discharge opening is communicated with the sand storage chamber.

7. The steel shot screening device according to any one of claims 1-2, characterized in that, A flow stabilizer plate is provided in the pressure-bearing housing. The flow stabilizer plate is provided with a plurality of flow stabilizing through holes. The flow stabilizer plate is arranged above the swirl inlet, and the pressure-bearing housing is divided into an upper static water area and a lower swirl separation area by the flow stabilizer plate.

8. The steel shot screening device according to claim 7, characterized in that, The plurality of flow stabilizing through holes are evenly spaced and arranged on the flow stabilizer plate.

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