Feed cooling and grading screen

Abstract

This invention discloses a feed cooling and grading sieve, relating to the field of feed cooling and grading technology. It includes a central cylinder and a sieve cylinder, the sieve cylinder rotating relative to the central cylinder, the central cylinder and the sieve cylinder being coaxially arranged, forming an annular cavity between them; an isolation ring and a spiral ring, the isolation ring being fixedly connected to the central cylinder, the spiral ring being disposed on the inner wall of the sieve cylinder and rotating with the sieve cylinder, the isolation ring dividing the annular cavity into multiple zones; a connecting component for connecting or closing adjacent zones; a venting ring and a conveying pipe, an air compressor delivering high-pressure cold air through the conveying pipe to the venting ring, the venting ring being connected to the annular cavity. The beneficial effects of this invention are that the annular cavity allows for cooling and grading of materials within it, resulting in a more compact space for the materials. The zoned material arrangement prevents hot materials entering the sieve cylinder from sharing the same temperature environment with cold materials exiting the sieve cylinder, avoiding airflow turbulence and ensuring that the materials are cooled strictly according to a temperature gradient.

Description

Technical Field

[0001] This invention relates to the field of feed cooling and grading technology, and more specifically, to a feed cooling and grading sieve. Background Technology

[0002] During feed production, pellets are formed using a pellet mill. Because pellet mills use an extrusion process, the temperature and humidity are high, reaching 90 degrees Celsius. Active cooling is required later. Existing technologies, such as the one described in application CN202010166474.9, use a double-screen cylinder to draw external cold air to the material for cooling. While this achieves cooling and grading, it has the following drawbacks: 1. The double-screen cylinder requires a high rotation speed to generate sufficient convective cold air, but high rotation speed is not required during screening, resulting in a weak cold air source that cannot quickly and accurately cool the material, affecting the cooling effect. 2. The hot material entering the screen cylinder and the cold material exiting the screen cylinder are in the same temperature space, causing the hot and cold air to mix. When the cold air cools the hot material, it heats up, which in turn heats the cold material exiting the screen cylinder, affecting the cooling effect. Summary of the Invention

[0003] To address the above deficiencies, this invention provides a feed cooling and grading sieve, which solves the aforementioned problems.

[0004] To achieve the above objectives, the present invention adopts the following technical solution:

[0005] The feed cooling and grading screen includes materials, a base, an air compressor, a feed hopper, and a discharge port;

[0006] The central cylinder and the screen cylinder rotate relative to the central cylinder. The central cylinder and the screen cylinder are coaxially arranged, and an annular cavity is formed between the central cylinder and the screen cylinder. The material enters the annular cavity and is discharged through the screen cylinder.

[0007] The isolation ring and the spiral ring are fixedly connected to the central cylinder. The spiral ring is located on the inner wall of the screen cylinder and rotates with the screen cylinder. The isolation ring divides the annular cavity into multiple zones.

[0008] Connectivity components, located on the isolation ring, are used to connect or disconnect adjacent partitions;

[0009] The air compressor delivers high-pressure cold air to the air ring through the delivery pipe. The air ring is connected to the annular cavity.

[0010] Furthermore, support rings are installed at both ends of the central cylinder, and bearing 1 is installed on the outside of the support rings. The inside of the screen cylinder is connected to the outside of bearing 1, and a cooling screen section is formed between the support rings, the central cylinder, and the screen cylinder. The feed hopper is installed on one of the support rings, and the discharge port is located at the lower end of the other support ring. Gear 1 is installed on the outside of the screen cylinder, and motor 1 that meshes with gear 1 is installed on the base.

[0011] Furthermore, the material accumulates at the lower end of the screen cylinder, and the rotation of the screen cylinder drives the spiral ring to rotate; when the connecting component is open, it drives the material to move towards the discharge port; when the connecting component is closed, the material circulates within the partition.

[0012] Furthermore, the connecting component includes a second bearing mounted on the central cylinder, a rotating shaft installed inside the second bearing, a rotating plate mounted at the lower end of the rotating shaft, an opening at the lower end of the isolation ring that is interference-fitted with the rotating plate, and a telescopic cylinder mounted on the central cylinder, the telescopic end of the telescopic cylinder being connected to the rotating shaft; when the rotating plate and the opening are on the same plane, materials in adjacent zones cannot flow; when the rotating plate and the opening are on different planes, materials in adjacent zones can flow.

[0013] Furthermore, an annular gap is provided between the isolation ring and the screen cylinder, and an annular air bladder is installed on the isolation ring. The annular air bladder fills the annular gap. When the annular air bladder is inflated, the material in the adjacent zone cannot flow. When the annular air bladder is deflated, the material in the adjacent zone can flow.

[0014] Furthermore, wear-resistant rings are installed on the inner wall of the screen cylinder, and the positions of the wear-resistant rings and the isolation rings correspond to each other.

[0015] Furthermore, there are multiple ventilation rings, each corresponding to a zone, and ventilation holes are provided between the ventilation rings and the central cylinder. An electrically controlled valve is installed between the ventilation rings and the delivery pipe.

[0016] Furthermore, the surface of the sieve cylinder is provided with a square hole one, and a sleeve is installed on the surface of the sieve cylinder. The surface of the sleeve is provided with a square hole two. The diagonals of the square hole one and the square hole two are on the same straight line. One diagonal of the square hole is parallel to the axis of the sieve cylinder. The overlapping position of the square hole one and the square hole two forms a sieve hole. The sleeve and the sieve cylinder move relative to each other along the axial direction. The sieve hole is square and the hole diameter is variable.

[0017] Furthermore, an internally threaded tube is installed at one end of the sleeve, and a limit block is installed at one end of the screen cylinder. The limit block contains a threaded shaft that connects to the internally threaded tube. The limit block restricts the horizontal movement of the threaded shaft, while the threaded shaft can rotate.

[0018] Furthermore, the screen aperture on the feed hopper side is smaller than that on the discharge port side.

[0019] The beneficial effects of this invention are: the annular cavity is set up so that the material can be cooled and graded within the annular cavity, making the space for the material more compact; at the same time, a ventilation ring is also set up so that the outside cold air can stably cool the material, achieving cooling without the need for the high rotation speed of the screen cylinder.

[0020] By dividing the materials into zones, hot materials entering the screen cylinder and cold materials about to exit the screen cylinder are kept in the same temperature environment, thus avoiding airflow chaos, improving the cooling effect, and ensuring that the materials are cooled strictly according to the temperature gradient.

[0021] By setting up a double-layer sieve cylinder and controlling the relative movement of square holes one and two, the size of the sieve cylinder aperture can be controlled, thus improving the practicality of the sieve cylinder. Attached Figure Description

[0022] Figure 1 This is a schematic diagram of the structure of the feed cooling and grading sieve described in this invention;

[0023] Figure 2 This is a schematic diagram of the longitudinal section of the sieve cylinder;

[0024] Figure 3 This is a schematic diagram of Embodiment 1 of the connecting component;

[0025] Figure 4 This is a schematic diagram of the cross-section of the sieve cylinder;

[0026] Figure 5 This is a schematic diagram of the sieve aperture;

[0027] Figure 6 This is a schematic diagram of Embodiment 2 of the connecting component;

[0028] Figure 7 This is a schematic diagram of a threaded shaft;

[0029] Figure 8 This is a schematic diagram of a spiral ring;

[0030] In the diagram: 1. Material; 2. Base; 3. Air compressor; 4. Feed hopper; 5. Discharge port; 6. Central cylinder; 7. Screen cylinder; 8. Annular cavity; 9. Isolation ring; 10. Spiral ring; 11. Zone; 12. Ventilation ring; 13. Conveying pipe; 21. Support ring; 22. Bearing 1; 23. Gear 1; 24. Motor 1; 41. Bearing 2; 42. Rotating shaft; 43. Rotating plate; 44. Opening; 45. Telescopic cylinder; 51. Annular gap; 52. Annular air bladder; 53. Wear-resistant ring; 71. Vent hole; 72. Electric control valve; 81. Square hole 1; 82. Sleeve; 83. Square hole 2; 84. Screen hole; 91. Internally threaded pipe; 92. Limiting block; 93. Threaded shaft. Detailed Implementation

[0031] To make the above-mentioned objects, features and advantages of the present invention more apparent and understandable, the specific embodiments of the present invention will be described in detail below with reference to the accompanying drawings.

[0032] This application provides a feed cooling and grading sieve; please refer to [reference needed]. Figures 1-8 It includes material 1, base 2, air compressor 3, feed hopper 4, and discharge port 5, and also includes;

[0033] The central cylinder 6 and the screen cylinder 7 are arranged coaxially with the central cylinder 6 and the screen cylinder 7. An annular cavity 8 is formed between the central cylinder 6 and the screen cylinder 7. The material 1 enters the annular cavity 8 and is discharged through the screen cylinder 7.

[0034] The isolation ring 9 and the spiral ring 10 are fixedly connected to the central cylinder 6. The spiral ring 10 is located on the inner wall of the screen cylinder 7 and rotates with the screen cylinder 7. The isolation ring 9 divides the annular cavity 8 into multiple partitions 11.

[0035] A connectivity component, located on isolation ring 9, is used to connect or disconnect adjacent partitions 11;

[0036] The air compressor 3 delivers high-pressure cold air to the air ring 12 through the air delivery pipe 13. The air ring 12 is connected to the annular cavity 8.

[0037] In practical applications, multiple partitions 11 are independent of each other, and temperature sensors are provided between different partitions 11; multiple partitions 11 are combined to form an annular cavity 8.

[0038] After being formed, the material 1 enters the annular cavity 8 through the feed hopper 4. Under the action of gravity, the material 1 accumulates below the screen cylinder 7. By controlling the rotation of the screen cylinder 7, the material 1 can be screened. When the temperature of the material 1 is lower than the set value, the connecting component is opened to facilitate the material 1 to move towards the discharge port 5. The temperature set value of the partition 11 from the feed hopper 4 to the discharge port 5 is decreasing. As the material 1 passes through in sequence, gradient cooling can be achieved.

[0039] By setting the spiral ring 10, when the spiral ring 10 rotates, it can drive the material 1 to actively move towards the discharge port 5;

[0040] Air compressor 3 delivers high-pressure cold air to the ventilation ring 12 through the conveying pipe 13. The ventilation ring is connected to the annular cavity 8. The intake volume of high-pressure cold air from the outside is different in different partitions 11. For example, when material 1 first enters partition 11, the temperature is relatively high, so the injection volume of high-pressure cold air is large. Conversely, when material 1 is about to move to the discharge port 5, the temperature is relatively low, so the injection volume of high-pressure cold air is small.

[0041] In this embodiment, through the operation of the screen cylinder 7, the debris in the material 1 passes through the screen cylinder 7 and falls onto the conveyor belt below, while the qualified material 1 is discharged to another conveyor belt through the discharge port 5.

[0042] Reference Figure 1 , Figure 2 , Figure 3 and Figure 4 The central cylinder 6 has support rings 21 installed at both ends, and bearings 22 are installed on the outside of the support rings 21. The inner side of the screen cylinder 7 is connected to the outer side of the bearings 22. A cooling screen section 11 is formed between the support rings 21, the central cylinder 6 and the screen cylinder 7. The feed hopper 4 is installed on one of the support rings 21, and the discharge port 5 is located at the lower end of the other support ring 21. A gear 23 is installed on the outside of the screen cylinder 7, and a motor 24 that meshes with the gear 23 is installed on the base 2.

[0043] In practical applications, the support ring 21, the central cylinder 6, and the base 2 are relatively stationary with respect to the ground. The screen cylinder 7 is rotatably connected to the support ring 21 via the bearing 22. When the motor 24 rotates, it drives the gear 23 and the screen cylinder 7 to rotate, ultimately achieving screening.

[0044] Reference Figure 1 , Figure 2 , Figure 3 and Figure 4 Material 1 accumulates at the lower end of screen cylinder 7. When screen cylinder 7 rotates, it drives spiral ring 10 to rotate. When the connecting component is opened, it drives material 1 to move towards the discharge port 5. When the connecting component is closed, material 1 circulates and rolls within partition 11.

[0045] In practical applications, when the connecting components are closed, the multiple partitions 11 are in an independent state. Temperature sensors are provided between different partitions 11. For example, in this embodiment, there are 6 partitions 11 and 5 connecting components. The sensing thresholds from the feed hopper 4 to the discharge port 5 are set to 90 degrees, 75 degrees, 60 degrees, 45 degrees, and 30 degrees respectively. Material 1 below 30 degrees is discharged through the discharge port 5 and can be cooled naturally.

[0046] When the temperature of material 1 in section 11 on one side of feed hopper 4 is lower than 90 degrees, the corresponding connecting component is opened. Under the action of the spiral ring 10, material 1 moves to the adjacent section 11 away from feed hopper 4. The above operation is repeated until the temperature drops to 30 degrees and is finally discharged from the outlet 5.

[0047] Example 1 of the connectivity component, see below. Figure 1 , Figure 2 , Figure 3 and Figure 4The connecting component includes a bearing 41 mounted on the central cylinder 6, a rotating shaft 42 installed inside the bearing 41, a rotating plate 43 mounted on the lower end of the rotating shaft 42, an opening 44 at the lower end of the isolation ring 9 that is interference-fitted with the rotating plate 43, and a telescopic cylinder 45 mounted on the central cylinder 6, the telescopic end of the telescopic cylinder 45 being connected to the rotating shaft 42; when the rotating plate 43 and the opening 44 are on the same plane, the material 1 in the adjacent partition 11 cannot flow; when the rotating plate 43 and the opening 44 are on different planes, the material 1 in the adjacent partition 11 can flow.

[0048] In practical applications, multiple telescopic cylinders 45 are provided. When the temperature of partition 11 drops below the threshold, the telescopic cylinders 45 are extended. The telescopic cylinders 45 drive the rotating shaft 42 and the rotating plate 43 to rotate, connecting the spaces of adjacent partitions 11. The material 1 is pushed from one partition 11 to the next partition 11 by the action of the spiral ring 10. After the material 1 is pushed out, the telescopic cylinders 45 shorten, and the rotating plate 43 and the opening 44 are on the same plane.

[0049] Control the air intake of the ventilation ring 12 to synchronize the temperature drop rate in different zones 11, and make the rotating plates 43 at different positions open or close synchronously.

[0050] Of course, depending on the actual situation, if the temperature of material 1 fluctuates, the rotating plate 43 may be opened or closed asynchronously.

[0051] Example 2 of the connecting component, refer to Figure 1 , Figure 2 and Figure 6 An annular gap 51 is provided between the isolation ring 9 and the screen cylinder 7. An annular airbag 52 is installed on the isolation ring 9 and fills the annular gap 51. When the annular airbag 52 is inflated, the material 1 in the adjacent section 11 cannot flow. When the annular airbag 52 is deflated, the material 1 in the adjacent section 11 can flow.

[0052] In practical applications, when the annular airbag 52 deflates, it opens the annular gap 51, allowing material 1 to be pushed from one section 11 to the next section 11; when the annular airbag 52 inflates, it closes the annular gap 51.

[0053] Reference Figure 1 , Figure 2 , Figure 3 and Figure 4 The inner wall of the screen cylinder 7 is equipped with a wear-resistant ring 53, which corresponds to the position of the isolation ring 9.

[0054] In practical applications, the wear-resistant ring 53 improves the durability of the isolation ring 9 and the screen cylinder 7 while ensuring good sealing of the partition 11.

[0055] Reference Figure 1, Figure 2 , Figure 3 and Figure 4 The ventilation ring 12 is provided in multiple ways and corresponds to the partition 11 respectively. A ventilation hole 71 is provided between the ventilation ring 12 and the central cylinder 6. An electric control valve 72 is installed between the ventilation ring 12 and the conveying pipe 13.

[0056] In practical applications, the delivery pipe 13 is connected to multiple ventilation rings 12 through an electric control valve 72. By setting the electric control valve 72, the air intake of the ventilation ring 12 can be controlled individually, thereby controlling the cooling rate.

[0057] Reference Figures 1 to 8 The surface of the sieve cylinder 7 is provided with a square hole 81. A sleeve 82 is installed on the surface of the sieve cylinder 7. The surface of the sleeve 82 is provided with a square hole 83. The diagonals of the square hole 81 and the square hole 83 are on the same straight line. The diagonal of the square hole 81 is parallel to the axis of the sieve cylinder 7. The overlapping position of the square hole 81 and the square hole 83 forms a sieve hole 84. The sleeve 82 and the sieve cylinder 7 move relative to each other along the axial direction. The sieve hole 84 is square and the diameter can be changed.

[0058] In practical applications, in order to improve the practicality of the sieve cylinder 7, the size of the sieve hole 84 is set to be variable, and square hole one 81 and square hole two 83 are combined to form sieve hole 84.

[0059] When the overlapping area of ​​square hole 1 81 and square hole 2 83 is small, the resulting sieve hole 84 has a smaller diameter, allowing smaller debris from material 1 to pass through.

[0060] When the area of ​​the overlapping square hole 81 and square hole 83 is large, the sieve hole 84 formed at this time has a larger diameter, which allows larger debris in material 1 to pass through.

[0061] By ensuring that the diagonals of square hole 81 and square hole 83 are on the same straight line, and that the diagonal of square hole 81 is parallel to the axis of the sieve cylinder 7, the shape of the sieve hole 84 remains square when the size of the sieve hole 84 is changed, thus avoiding affecting the passage of debris.

[0062] Reference Figure 1 , Figure 7 and Figure 8 One end of the sleeve 82 is equipped with an internally threaded tube 91, and one end of the screen cylinder 7 is equipped with a limiting block 92. The limiting block 92 is equipped with a threaded shaft 93 connected to the internally threaded tube 91. The limiting block 92 restricts the horizontal movement of the threaded shaft 93, while the threaded shaft 93 can rotate.

[0063] In practical applications, when the threaded shaft 93 is rotated, the limiting block 92 restricts the horizontal movement of the threaded shaft 93, and the rotation of the threaded shaft 93 drives the internal threaded tube 91 and the sleeve 82 to move horizontally.

[0064] When the threaded shaft 93 rotates forward, it drives the sleeve 82 to move relative to the sieve cylinder 7. Square hole 1 81 and square hole 2 83 are in a state of opposing movement. The overlapping area of ​​square hole 1 81 and square hole 2 83 increases, and at this time the sieve hole 84 becomes larger.

[0065] When the threaded shaft 93 reverses, square hole 1 81 and square hole 2 83 are in opposite directions, and the overlapping area of ​​square hole 1 81 and square hole 2 83 becomes smaller, at which time the sieve hole 84 becomes smaller.

[0066] Reference Figures 1 to 8 The diameter of the screen hole 84 on one side of the feed hopper 4 is smaller than that of the screen hole 84 on the side of the discharge port 5.

[0067] In practical applications, by setting the screen hole 84 on one side of the feed hopper 4 to be larger than the screen hole 84 on the side of the discharge port 5, the material 1 can be screened in multiple stages.

[0068] For example, in this embodiment, the screen hole 84 is set to two specifications: the screen hole 84 near the feed hopper 4 has a diameter of 5 mm, and the screen hole 84 near the discharge port 5 has a diameter of 15 mm. The effect is that debris smaller than 5 mm is discharged from the screen hole 84 on the feed hopper 4 side, material 1 between 5 mm and 15 mm is discharged through the screen hole 84 on the discharge port 5 side, and material 1 with a diameter greater than 15 mm is discharged directly from the discharge port 5.

Claims

1. A feed cooling and grading screen, comprising a material (1), a base (2), an air compressor (3), a feed hopper (4), and a discharge port (5), characterized in that, Also includes; The center cylinder (6) and the screen cylinder (7) rotate relative to the center cylinder (6). The center cylinder (6) and the screen cylinder (7) are coaxially arranged. An annular cavity (8) is formed between the center cylinder (6) and the screen cylinder (7). The material (1) enters the annular cavity (8) and is discharged through the screen cylinder (7). Isolation ring (9) and spiral ring (10). Isolation ring (9) is fixedly connected to central cylinder (6). Spiral ring (10) is located on the inner wall of screen cylinder (7) and rotates with screen cylinder (7). Isolation ring (9) divides annular cavity (8) into multiple partitions (11). A connectivity component, located on the isolation ring (9), is used to connect or disconnect adjacent partitions (11). Ventilation ring (12) and delivery pipe (13). Air compressor (3) delivers high-pressure cold air to ventilation ring (12) through delivery pipe (13). Ventilation ring (12) is connected to annular cavity (8). Material (1) accumulates at the lower end of screen cylinder (7). When screen cylinder (7) rotates, it drives spiral ring (10) to rotate. When the connecting component is opened, it drives material (1) to move towards the discharge port (5). When the connecting component is closed, material (1) circulates and rolls in partition (11). The connecting component includes a bearing 2 (41) installed on the central cylinder (6), a rotating shaft (42) installed inside the bearing 2 (41), a rotating plate (43) installed at the lower end of the rotating shaft (42), an opening (44) with interference fit to the rotating plate (43) at the lower end of the isolation ring (9), a telescopic cylinder (45) installed on the central cylinder (6), and the telescopic end of the telescopic cylinder (45) is connected to the rotating shaft (42); when the rotating plate (43) and the opening (44) are on the same plane, the material (1) of the adjacent partition (11) cannot flow; when the rotating plate (43) and the opening (44) are on different planes, the material (1) of the adjacent partition (11) can flow.

2. The feed cooling and grading sieve according to claim 1, characterized in that, Support rings (21) are installed at both ends of the central cylinder (6). A bearing (22) is installed on the outside of the support ring (21). The inside of the screen cylinder (7) is connected to the outside of the bearing (22). A cooling screen partition (11) is formed between the support ring (21), the central cylinder (6) and the screen cylinder (7). The feed hopper (4) is installed on one of the support rings (21), and the discharge port (5) is located at the lower end of the other support ring (21). A gear (23) is installed on the outside of the screen cylinder (7), and a motor (24) that meshes with the gear (23) is installed on the base (2).

3. The feed cooling and grading sieve according to claim 1, characterized in that, An annular gap (51) is provided between the isolation ring (9) and the screen cylinder (7). An annular airbag (52) is installed on the isolation ring (9). The annular airbag (52) fills the annular gap (51). When the annular airbag (52) is inflated, the material (1) in the adjacent section (11) cannot flow. When the annular airbag (52) is deflated, the material (1) in the adjacent section (11) can flow.

4. The feed cooling and grading sieve according to claim 1 or 3, characterized in that, Wear-resistant rings (53) are installed on the inner wall of the screen cylinder (7), and the positions of the wear-resistant rings (53) and the isolation rings (9) are corresponding.

5. The feed cooling and grading sieve according to claim 4, characterized in that, Multiple ventilation rings (12) are provided and correspond to the partitions (11) respectively. Ventilation holes (71) are provided between the ventilation rings (12) and the central cylinder (6). An electric control valve (72) is installed between the ventilation rings (12) and the delivery pipe (13).

6. The feed cooling and grading sieve according to claim 5, characterized in that, The surface of the sieve cylinder (7) is provided with a square hole one (81), and a sleeve (82) is installed on the surface of the sieve cylinder (7). The surface of the sleeve (82) is provided with a square hole two (83). The diagonals of the square hole one (81) and the square hole two (83) are on the same straight line. The diagonal of the square hole one (81) is parallel to the axis of the sieve cylinder (7). The overlapping position of the square hole one (81) and the square hole two (83) forms a sieve hole (84). The sleeve (82) and the sieve cylinder (7) move relative to each other along the axial direction. The sieve hole (84) is square and the hole diameter is variable.

7. The feed cooling and grading sieve according to claim 6, characterized in that, One end of the sleeve (82) is fitted with an internal threaded tube (91), and one end of the screen cylinder (7) is fitted with a limit block (92). The limit block (92) is fitted with a threaded shaft (93) connected to the internal threaded tube (91). The limit block (92) restricts the horizontal movement of the threaded shaft (93), and the threaded shaft (93) can rotate.

8. The feed cooling and grading sieve according to claim 7, characterized in that, The diameter of the sieve hole (84) on one side of the feed hopper (4) is smaller than that of the sieve hole (84) on the side of the discharge port (5).

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