A detachable double-layer screen

Abstract

This utility model belongs to the field of screen technology and discloses a detachable double-layer screen, including an inner screen unit, an outer screen unit, and a screen body unit coaxially sleeved between the inner and outer screen units. A rotating shaft passes through the center of the screen body unit. Both the inner and outer screen units contain more than two arc-shaped screen units, which are detachably spliced ​​around the center of the screen body unit to form a double-layer cylindrical screen. The screen body units are evenly spaced on the rotating shaft and combined with the corresponding double-layer cylindrical screen to form a complete screen. A screen cover is provided on the left side of the complete screen, and support rods are evenly distributed on the outer circumference of the screen body unit. A trumpet-shaped discharge port is provided on the right side of the complete screen. This utility model can quickly replace the screen, reduce the overall screen replacement production cost, and the two screens form a multi-stage filtration. High-pressure air is blown from the inside of the screen to the outside to remove impurities and salt blocks adhering to the screen and assist in the removal of debris.

Description

Technical Field

[0001] This utility model belongs to the field of sieves, specifically relating to a detachable double-layer sieve. Background Technology

[0002] In the salt production process, brine screening is a crucial step. Its purpose is to remove impurities (such as branches, shells, and sand) and grade the brine to separate salt particles of different sizes. Traditional screening equipment typically uses a single-layer screen structure, achieving material separation through vibration or rotation. However, existing screening technologies still have the following problems in practical applications:

[0003] 1. Low efficiency of single-stage screening: Traditional screens are mostly single-layer structures, which can only achieve filtration of a single pore size and cannot simultaneously perform the dual functions of coarse screening (removing large particles of impurities) and fine screening (separating fine salt particles). If multi-stage screening is required, multiple devices need to be connected in series, resulting in a complex process flow, large footprint, and increased energy consumption.

[0004] 2. High maintenance costs: Existing screens mostly adopt an integrated cylindrical structure. When a part of the screen is damaged, the entire structure still needs to be disassembled, which is cumbersome and time-consuming. In addition, the high corrosiveness of brine salts can easily cause metal connectors (such as screws and fixing plates) to rust, further increasing the difficulty of maintenance.

[0005] 3. Screens are prone to clogging: When the brine has a high moisture content, it is easy to clump and stick together, especially in fine-mesh screens, which can easily cause clogging. Traditional screens lack an effective self-cleaning mechanism, requiring frequent machine shutdowns for manual cleaning, which affects production efficiency.

[0006] 4. Insufficient structural stability: Double-layer screens need to solve the problems of concentricity and vibration synchronization between the inner and outer layers. Under high-speed rotation or high-load conditions, they are prone to swaying, which can lead to screen deformation or connection failure.

[0007] To address the aforementioned issues, there is an urgent need for a modular, corrosion-resistant, and highly efficient anti-clogging double-layer screen system capable of multi-stage synchronous screening of brine, while also possessing a quick disassembly and assembly function to adapt to the harsh working conditions of salt production. Utility Model Content

[0008] To address the aforementioned technical problems, this invention provides a detachable double-layer screen. By fixing the inner and outer screen units onto the screen body unit to form a detachable quick-release structure module, the screen fabric can be replaced individually without replacing the entire screen. This simplifies operation and reduces production costs. The screen body unit ensures uniform stress on the screen fabric, extending its service life. Furthermore, the double-layer screen works together to screen, with the inner layer intercepting impurities and large particles of adhering salt, and the outer layer performing secondary screening, forming multi-stage filtration. This significantly improves filtration efficiency while enhancing grading accuracy.

[0009] The technical solution adopted by this utility model is: a detachable double-layer screen, including an inner screen unit and an outer screen unit, a screen body unit coaxially sleeved between the inner and outer screen units, and a rotating shaft. The rotating shaft passes through the center of the screen body unit. Both the inner and outer screen units contain more than two arc-shaped screen units, which are detachably spliced ​​around the center of the screen body unit to form a double-layer cylindrical screen. The screen body units are evenly spaced on the rotating shaft and connected to the corresponding double-layer cylindrical screen. A complete screen is formed. The complete screen has a screen body cover on the left side and a trumpet-shaped discharge port on the right side. Support rods are evenly distributed along the outer circumference of the screen body unit. The screen body unit includes a fixing ring, which is a disc-shaped structure with a central through hole and is sleeved on the rotating shaft. It also includes an inner ring and an outer ring arranged coaxially with the fixing ring. More than six reinforcing ribs are evenly arranged along the outer circumference of the fixing ring. One end of the reinforcing rib is fixed to the fixing ring, and the other end passes through the inner ring and is fixed to the outer ring.

[0010] Specifically, the rotating shaft has a three-section spliced ​​structure, which includes a solid shaft section one and shaft section two, and a hollow tube shaft. Shaft section one is fixedly connected to the left side of the tube shaft, shaft section two is fixedly connected to the right side, and the outside of the rotating shaft is covered with a stainless steel layer.

[0011] Specifically, a retaining ring is provided on the right side of the screen body unit, and the screen body unit is fixed on the rotating shaft by the retaining ring. The retaining ring has a two-half structure, with threaded holes on both sides and a stop block on the side of the retaining ring. The retaining ring is welded to the rotating shaft by the stop block.

[0012] Specifically, the inner and outer rings are annular structures with three rows of threaded holes evenly distributed on their respective annular surfaces. The left and right sides of the annular surfaces have double-hole threaded holes, while the middle row has single-hole threaded holes. The reinforcing ribs pass through the middle row of single-hole threaded holes of the inner ring and are fixed to the outer ring. The inner and outer screen units are provided with threaded holes corresponding to those on the inner and outer rings. The inner and outer screen units are connected to their respective inner and outer rings by bolts.

[0013] Specifically, it also includes a high-pressure air-assisted cleaning component installed on the tube shaft. The high-pressure self-cleaning component includes a high-pressure air supply component and a tube shaft that serves as the main air passage. The tube shaft contains independent air chambers set according to the corresponding double-layer cylindrical screen. Each independent air chamber has more than ten radial diversion holes on the rotating shaft. Each radial diversion hole is connected to a high-pressure air nozzle. The high-pressure air nozzle sprays towards the inner surface of the double-layer cylindrical screen. The high-pressure air supply component is connected to the rotating shaft through a rotary joint.

[0014] Specifically, the high-pressure air supply assembly includes an air compressor, an air tank, a solenoid valve, and a balance valve. The air compressor is connected to the inlet of the air tank through a pipeline, and the outlet of the air tank is connected to the solenoid valve. The outlet of the solenoid valve is connected to an independent air chamber inside the rotating shaft through a rotary joint. The independent air chamber is connected to the balance valve through an internal pipeline and then leads to a radial diversion hole.

[0015] Specifically, the independent air chambers within the tube shaft maintain basic air pressure communication through a balancing valve and are controlled by a solenoid valve. The balancing valve is a one-way valve used to replenish airflow from the high-pressure air chamber to the low-pressure air chamber and prevent directional flow.

[0016] The beneficial effects of this utility model are as follows: (1) This utility model forms a detachable quick-release structure module by fixing the detachable inner screen unit and the outer screen unit on the screen body unit. The screen cloth can be replaced separately without replacing the entire screen, which simplifies the operation and reduces the production cost. The screen body unit can make the screen cloth bear the force evenly and extend its service life. Moreover, the double screens work together to screen. The inner layer intercepts impurities and large particles of salt blocks, and the outer layer screens twice to form multi-stage filtration. On the basis of improving the grading accuracy, the filtration efficiency is significantly improved.

[0017] By fixing the screen body unit coaxially with the rotating shaft, the concentricity and vibration stability of the double-layer screen are significantly increased. On this basis, the reinforcing ribs and support rods can make the screen structure more stable, the stress is even, and the service life is extended while improving the screen body's resistance to deformation.

[0018] By setting up a high-pressure air-assisted cleaning component, the high-pressure air nozzle can blow air from the inside of the screen outwards, which can remove impurities and salt clumps adhering to the screen, help the debris fall off, maintain screening efficiency, and replace manual cleaning. Attached Figure Description

[0019] Figure 1 This is a three-dimensional schematic diagram of the present invention;

[0020] Figure 2 This is the right view of the present invention;

[0021] Figure 3 This is a front view of the rotating shaft of this utility model;

[0022] The diagram shows the following markings: 1. Inner screen unit; 2. Outer screen unit; 3. Screen body unit; 31. Fixing ring; 32. Inner ring; 33. Outer ring; 34. Reinforcing rib; 311. Single-hole threaded hole; 312. Double-hole threaded hole; 4. Rotating shaft; 41. Shaft section one; 42. Shaft section two; 43. Tube shaft; 5. Arc-shaped screen unit; 7. Complete screen; 8. Screen body cover; 81. Discharge port; 9. Snap ring; 10. Independent air chamber; 11. Radial diversion hole; 12. High-pressure air nozzle; 13. Rotary joint; 14. Air tank; 15. Solenoid valve. Detailed Implementation

[0023] The specific embodiments of this utility model will be further described in detail below with reference to the accompanying drawings.

[0024] like Figure 1-3 As shown, a detachable double-layer screen includes an inner screen unit 1 and an outer screen unit 2, a screen body unit 3 coaxially sleeved between the inner screen unit 1 and the outer screen unit 2, and a rotating shaft 4. The rotating shaft 4 passes through the center of the screen body unit 3. Both the inner screen unit 1 and the outer screen unit 2 contain more than two arc-shaped screen units 5, which are detachably spliced ​​around the center of the screen body unit 3 to form a double-layer cylindrical screen cylinder 6. The screen body units 3 are evenly spaced on the rotating shaft 4 and connected to the corresponding double-layer cylindrical screen cylinder 6 to form a complete screen 7. The screen 7 has a screen cover 8 on the left side and a trumpet-shaped discharge port 81 on the right side. Support rods are evenly distributed along the outer circumference of the screen unit 3. The screen unit 3 includes a fixing ring 31, which is a disc-shaped structure with a central through hole. It is sleeved on the rotating shaft 4. It also includes an inner ring 32 and an outer ring 33 coaxial with the fixing ring 31. More than six reinforcing ribs 34 are evenly spaced along the outer circumference of the fixing ring 31. One end of the reinforcing rib 34 is fixed to the fixing ring 31, and the other end passes through the inner ring 32 and is fixed to the outer ring 33.

[0025] Preferably, the rotating shaft 4 is a three-section spliced ​​structure, which includes a solid shaft section 41 and a shaft section 42, and a hollow tube shaft 43. The left side of the tube shaft 43 is fixedly connected to the shaft section 41, and the right side is fixedly connected to the shaft section 42. The outer side of the rotating shaft 4 is covered with a 316 stainless steel layer.

[0026] Preferably, a retaining ring 9 is provided on the right side of the screen body unit 3. The screen body unit 3 is fixed to the rotating shaft 4 by the retaining ring 9. The retaining ring 9 has a two-half structure. Threaded holes are provided on both sides of the retaining ring 9. A stop is provided on the side of the retaining ring 9. The retaining ring 9 is welded to the rotating shaft 4 by the stop.

[0027] Preferably, the inner ring 32 and the outer ring 33 are annular structures, with three rows of threaded holes evenly distributed on their respective annular surfaces. The left and right sides of the annular surface have double-hole threaded holes 312, and the middle row has single-hole threaded holes 311. The reinforcing rib 34 passes through the middle row of single-hole threaded holes 311 of the inner ring 32 and is fixed to the outer ring 33. The inner screen unit 1 and the outer screen unit 2 are provided with threaded holes corresponding to those on the inner ring 32 and the outer ring 33. The inner screen unit 1 and the outer screen unit 22 are connected to their respective inner ring 32 and outer ring 33 by bolts.

[0028] Preferably, it also includes a high-pressure air-assisted cleaning component mounted on the tube shaft 43. The high-pressure self-cleaning component includes a high-pressure air supply component and a tube shaft 43 serving as the main air passage. The tube shaft 43 contains independent air chambers 10 arranged according to the corresponding double-layer cylindrical sieve cylinder 6. Each independent air chamber 10 has more than ten radial diversion holes 11 on the rotating shaft 4. Each radial diversion hole 11 is connected to a high-pressure air nozzle 12. The spray direction of the high-pressure air nozzle 12 is towards the inner surface of the double-layer cylindrical sieve cylinder 6. The high-pressure air supply component is connected to the rotating shaft 4 through a rotary joint 13.

[0029] Preferably, the high-pressure air supply assembly includes an air compressor, an air tank 14, a solenoid valve 15, and a balance valve. The air compressor is connected to the inlet of the air tank 14 through a pipeline, and the outlet of the air tank 14 is connected to the solenoid valve 15. The outlet of the solenoid valve 15 is connected to an independent air chamber inside the rotating shaft 4 through a rotary joint 13. The independent air chamber 10 is connected to the balance valve through a built-in pipeline and then leads to the radial diversion hole 11.

[0030] Preferably, the independent air chamber 10 within the tube shaft 43 maintains basic air pressure communication through a balancing valve and is controlled by a solenoid valve 15. The balancing valve is a one-way valve used to replenish airflow from the high-pressure air chamber to the low-pressure air chamber and prevent directional flow.

[0031] In practical use, the number of screen body units 3 can be set according to production needs. The inner screen unit 1 and the outer screen unit 2 can be detachably spliced ​​around the center of the screen body unit (3) to form a double-layer cylindrical screen cylinder 6. The screen body unit 3 is installed on the rotating shaft and combined with the corresponding double-layer cylindrical screen cylinder (6) to form a complete screen 7. The screen body unit 3 is locked on the rotating shaft 4 by the retaining ring 9, and the stop block is welded to prevent loosening.

[0032] The rotating shaft 4 is connected to the geared motor via a coupling. Starting the motor causes the rotating shaft 4 to rotate, driving the complete screen 7 to rotate as well. The salt to be screened enters the complete screen 7 through the feed inlet. The inner screen unit 1 has a larger aperture, intercepting large particles (such as branches and stones) and adhered salt lumps. The pre-filtered material enters the outer screen unit 2, which has a smaller aperture, performing secondary screening to separate the fine salt particles that meet the requirements. If the complete screen 7 is damaged, the arc-shaped screen unit 5 can be disassembled by loosening the bolts; the entire structure does not need to be removed.

[0033] When cleaning the complete screen 7, turn off the motor, stop the rotating shaft 4, start the air compressor, and the high-pressure air produced by the air compressor is delivered and stored in the air tank 14. It enters the independent air chamber 10 of the rotating shaft through the control of the solenoid valve 15. The high-pressure airflow passes through the radial diversion hole 11 and the high-pressure air nozzle 12 to spray the inner wall of the complete screen 7, cleaning the salt blocks and impurities adhering to the inner wall.

Claims

1. A detachable double-layer screen, characterized in that: The system includes an inner screen unit (1) and an outer screen unit (2), a screen body unit (3) coaxially sleeved between the inner screen unit (1) and the outer screen unit (2), and a rotating shaft (4). The rotating shaft (4) passes through the center of the screen body unit (3). Both the inner screen unit (1) and the outer screen unit (2) contain more than two arc-shaped screen units (5), which are detachably spliced ​​around the center of the screen body unit (3) to form a double-layer cylindrical screen cylinder (6). The screen body units (3) are evenly spaced on the rotating shaft (4) and connected to the corresponding double-layer cylindrical screen cylinder (6) to form a complete screen (7). The left side of the complete screen (7) The screen body unit (3) is equipped with a screen cover (8) and a complete screen (7). A horn-shaped discharge port (81) is provided on the right side. Support rods are evenly distributed along the outer circumference of the screen body unit (3). The screen body unit (3) includes a fixing ring (31), which is a disc-shaped structure with a central through hole. It is sleeved on the rotating shaft (4). It also includes an inner ring (32) and an outer ring (33) coaxially arranged with the fixing ring (31). More than six reinforcing ribs (34) are evenly arranged along the outer circumference of the fixing ring (31). One end of the reinforcing rib (34) is fixed on the fixing ring (31), and the other end passes through the inner ring (32) and is fixed on the outer ring (33).

2. The detachable double-layer screen according to claim 1, characterized in that: The rotating shaft (4) is a three-section spliced ​​structure, which includes a solid shaft section one (41) and shaft section two (42), and a hollow tube shaft (43). The tube shaft (43) is fixedly connected to shaft section one (41) on the left side and shaft section two (42) on the right side. The rotating shaft (4) is covered with a 316 stainless steel layer on the outside.

3. A detachable double-layer screen according to claim 2, characterized in that... A retaining ring (9) is provided on the right side of the screen body unit (3). The screen body unit (3) is fixed on the rotating shaft (4) by the retaining ring (9). The retaining ring (9) is a two-half structure. Threaded holes are provided on both sides of the retaining ring (9). A stop block is provided on the side of the retaining ring (9). The retaining ring (9) is welded to the rotating shaft (4) by the stop block.

4. A detachable double-layer screen according to claim 3, characterized in that: The inner ring (32) and outer ring (33) are annular structures with three rows of threaded holes evenly distributed on their respective annular surfaces. The left and right sides of the annular surface have double-hole threaded holes (312), and the middle row has single-hole threaded holes (311). The reinforcing rib (34) passes through the middle row of single-hole threaded holes (311) of the inner ring (32) and is fixed to the outer ring (33). The inner screen unit (1) and the outer screen unit (2) are provided with threaded holes corresponding to those on the inner ring (32) and the outer ring (33). The inner screen unit (1) and the outer screen unit (2) are connected to their respective inner ring (32) and outer ring (33) by bolts.

5. A detachable double-layer screen according to any one of claims 2-4, characterized in that: It also includes a high-pressure air-assisted cleaning component installed on the tube shaft (43). The high-pressure self-cleaning component includes a high-pressure air supply component and a tube shaft (43) as the main air passage. The tube shaft (43) has independent air chambers (10) set according to the corresponding double-layer cylindrical screen (6). Each independent air chamber (10) has more than ten radial diversion holes (11) on the rotating shaft (4). Each radial diversion hole (11) is connected to a high-pressure air nozzle (12). The spray direction of the high-pressure air nozzle (12) is towards the inner surface of the double-layer cylindrical screen (6). The high-pressure air supply component is connected to the rotating shaft (4) through a rotary joint (13).

6. A detachable double-layer screen according to claim 5, characterized in that: The high-pressure air supply assembly includes an air compressor, an air tank (14), a solenoid valve (15), and a balance valve. The air compressor is connected to the inlet of the air tank (14) through a pipe, and the outlet of the air tank (14) is connected to the solenoid valve (15). The outlet of the solenoid valve (15) is connected to the independent air chamber inside the rotating shaft (4) through a rotary joint (13). The independent air chamber (10) is connected to the balance valve through a built-in pipe and then leads to the radial diversion hole (11).

7. A detachable double-layer screen according to claim 6, characterized in that: The independent air chambers (10) inside the tube shaft (43) maintain basic air pressure communication through a balance valve and are controlled by a solenoid valve (15). The balance valve is a one-way valve used to supplement airflow from the high-pressure air chamber to the low-pressure air chamber and prevent directional flow.

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