A screening device and a screening process

Abstract

The application discloses a kind of screening device and screening process, including screening pool, screening pool is equipped with sieve tray, sieve tray is equipped with sieve groove, the both sides of screening pool are respectively equipped with flow channel mouth one, flow channel mouth two, the top of one side of screening pool is provided with feed hopper, sieve groove is located the side of screening pool away from feed hopper, and sieve groove is arranged with multiple along the direction away from feed hopper;Sieve groove is equipped with rotating lever assembly, rotating lever assembly includes main rod, the bottom of main rod is equipped with support rod, the upper end of support rod is equipped with multiple groove one, spring is arranged in groove one, the upper end of spring is abutted with top rod, sieve tray includes sieve hole, sieve hole is located the bottom of sieve groove, when top rod rotates to the bottom of sieve hole, it can be inserted into the bottom of sieve hole, when top rod rotates to the bottom away from sieve hole, it can be extended from the bottom of sieve hole;The bottom of screening pool is equipped with flow channel mouth three, flow channel mouth three is located below sieve groove, the lower end of sieve hole is communicated with flow channel mouth three.The application provides a kind of screening device and screening process, it is not easy to block when screening, and equipment cleaning frequency is low.

Description

Technical Field

[0001] This invention relates to the field of screening equipment technology, and in particular to a screening device and screening process. Background Technology

[0002] Lignosulfonates are a byproduct of sulfite pulping. After processing, lignin sulfonates can be used directly as a mineral powder binder to form mineral powder balls, thereby improving the smelting recovery rate in the smelting industry.

[0003] After the mineral powder balls are formed, the particle size varies. Large mineral powder balls need to be screened out. The screening process needs to be repeated multiple times. In the initial screening process, because the particle diameter range is large, if the screen holes are too small, it is easy to cause blockage, resulting in a high frequency of cleaning the screen. If the screen holes are too large, it will reduce the screening accuracy, affect the screening efficiency, and increase the workload. Summary of the Invention

[0004] The purpose of this invention is to overcome the shortcomings of the prior art and provide a screening device and screening process that is less prone to clogging during screening and requires less frequent equipment cleaning.

[0005] To achieve the above objectives, the technical solution of the present invention is as follows:

[0006] A screening device includes a screening tank, a screen plate installed at the bottom of the screening tank, a screen groove provided on the screen plate, a flow channel opening one and a flow channel opening two respectively provided on both sides of the screening tank, the bottom of the flow channel opening one and the flow channel opening two are higher than the screen plate, a feed hopper is provided above one side of the screening tank, and the screen groove is located on the side of the screening tank away from the feed hopper, and multiple screen grooves are arranged in the direction away from the feed hopper.

[0007] The screen trough is equipped with a rotating rod assembly, which includes a main rod that can rotate around its own axis. The main rod is inserted into the screen trough and its bottom passes through the screen plate. A support rod is installed at the bottom of the main rod and rotates with the main rod. The upper end of the support rod is provided with multiple slots. A spring is installed in each slot. The lower end of the spring abuts against the inner wall of the bottom of the slot. The upper end of the spring abuts against a top rod. The top rod is inserted into the slot and can move up and down along the inner wall of the slot. The screen plate includes screen holes located at the bottom of the screen trough. When the top rod rotates to below the screen holes, it can extend into the bottom of the screen holes. When the top rod rotates away from below the screen holes, it can extend out of the bottom of the screen holes.

[0008] The bottom of the screening tank is provided with a flow channel three, which is located below the screen trough, and the lower end of the screen hole is connected to the flow channel three.

[0009] The sieve hole includes a conical hole at the bottom, and the upper end of the push rod is circular. When the push rod extends into the sieve hole to its limit position, the upper end of the push rod is located inside the conical hole.

[0010] Multiple sieve holes are arranged radially along the bottom surface of the sieve groove and are evenly distributed circumferentially. The top rods are arranged radially along the bottom surface of the sieve groove and correspond one-to-one with the sieve holes in the same radial direction.

[0011] The main rod is also equipped with a lever, which is located above the bottom surface of the screen trough and rotates with the main rod.

[0012] The main rod near the feed hopper is also equipped with blades, which are spiral-shaped.

[0013] A cover plate is installed at the top of the screening pool, and the upper end of the main rod passes through the cover plate. A drive component is connected to the upper end of the main rod. The drive component includes a gear pair and a motor, and the motor can drive the main rod to rotate.

[0014] The feed hopper includes a flat section at the lower end, and a feeding chamber is provided inside the flat section.

[0015] The lever and the support rod are located on both sides of the main rod.

[0016] The distance between the bottom surface of the lever and the bottom surface of the screen groove is controlled to be two-thirds to three-quarters of the screen hole diameter.

[0017] A screening process includes a screening device and the following process steps:

[0018] S1: Initial screening:

[0019] When flow channel three is closed, flow channel one and flow channel two are open. The solvent flows from flow channel one to flow channel two. The feed hopper feeds the raw material. Under the action of the solvent, the raw material is separated and cleaned. Large particles fall into the sieve trough on the side closer to the feed hopper, and small particles fall into the sieve trough on the side farther away from the feed hopper.

[0020] S2: Secondary screening:

[0021] When the feed hopper stops feeding, flow channel two is closed and flow channel three is opened, the solvent flows from flow channel one through the sieve to flow channel three, the main rod rotates and drives the support rod to rotate, and the screened raw material particles are sent out from the bottom of the sieve holes.

[0022] The beneficial effects of this invention are:

[0023] The use of organic solvent flow to screen the solid particles of raw materials avoids the problem of screen clogging due to the large range of particle diameters in the initial screening stage. At the same time, the raw materials are cleaned, which speeds up the production process.

[0024] By setting a lever, larger raw material solid particles can quickly pass through the screen holes under the pressure of the lever during the secondary screening stage, preventing clogging.

[0025] By setting an ejectable push rod, blockages in the screen holes can be cleared promptly, reducing the cleaning frequency, increasing the equipment's continuous working time, and further increasing production efficiency. Attached Figure Description

[0026] Figure 1 This is a cross-sectional view of an embodiment;

[0027] Figure 2 for Figure 1 Enlarged view of point A in the middle.

[0028] In the diagram: Screening tank 1, Flow channel 11, Flow channel 2 12, Flow channel 3 13, Cover plate 14, Control valve 1 15, Control valve 2 16, Control valve 3 17, Feed hopper 2, Flat section 21, Discharge chamber 211, Screen plate 3, Screen groove 31, Screen hole 32, Conical hole section 321, Sealing gasket 4, Rotating rod assembly 5, Main rod 51, Toggle rod 52, Support rod 53, Groove 1 531, Top rod 54, Spring 55, Particle 6, Blade 7, Drive component 8, Gear 1 81, Gear 2 82, Motor 83. Detailed Implementation

[0029] The technical solution of the present invention will be further described below through embodiments and in conjunction with the accompanying drawings.

[0030] like Figures 1-2 As shown, a screening device is used to screen granular solids of varying sizes (in this embodiment, mineral powder balls using lignin sulfonate as a binder). The screening device includes a screening tank 1, with a screen plate 3 installed at the bottom of the screening tank 1. A sealing gasket 4 is provided between the bottom surface of the screen plate 3 and the screening tank 1. The screen plate 3 has a screen groove 31, which is recessed downwards along the upper end surface of the screen plate 3. The upper end of the screen groove 31 has a larger diameter, and the lower end has a smaller diameter, to facilitate the entry of material into the screen groove 31 from above. The screen groove 31 is recessed downwards along the upper end surface of the screen plate 3. Figure 1 The positions shown are set on the right side of the sieve plate 3, and there are two of them arranged in the left-right direction.

[0031] A feed hopper 2 is installed above one side of the screening pool 1 (i.e., Figure 1 (As shown in the left direction), the screen trough 31 is located on the side of the screening tank 1 away from the feed hopper 2. The feed hopper 2 includes a flat section 21 at the lower end, with material entering from the upper end and exiting from the bottom. The raw material is granular solid. The flat section 21 is provided with a discharge chamber 211. Figure 1 It forms a narrow opening in the left and right directions and a long strip in the front and back directions.

[0032] The screening tank 1 has two flow channels, one 11 and the other 12, on its two sides. Flow channels 11 and 12 are connected to control valves 15 and 16, respectively. Flow channel 11 is located on the left side of the screening tank 1, and flow channel 12 is located on the right side. When control valves 15 and 16 are opened, an organic solvent is introduced. The organic solvent can be ethanol or acetone, which are immiscible with lignin sulfonate. The solvent flows from flow channel 11, away from the sieve tank 31, to flow channel 12, and finally flows out from flow channel 12, maintaining a relatively stable flow rate. The bottom of flow channels 11 and 12 is higher than the sieve plate 3.

[0033] like Figure 1 As shown, L is the liquid level. The raw material flowing out from the lower end of the feeding chamber 211 enters below the liquid level L and moves to the right under the action of the solvent. Since the density of the raw material is greater than the density of the solvent, the raw material will sink and its trajectory is a parabola.

[0034] In the vertical direction, the net force on the glass particle is F(weight) - F(buoyancy).

[0035] F (gravity) = ρ (particle density) * V (particle volume) * g;

[0036] F (buoyancy) = ρ (solvent density) * V (particle volume) * g;

[0037] If the particle density is N times the solvent density (i.e., ρ(particle density) = N * ρ(solvent density));

[0038] Therefore, F (net force) = N * ρ (solvent density) * V (particle volume) * g;

[0039] Since ρ (solvent density) is a constant, the magnitude of F (net force) depends on the particle size. Larger particles experience a greater net force in the vertical direction, resulting in a greater acceleration during sinking, a faster sinking speed, and a shorter settling time. In the horizontal direction, if raw materials of different sizes are given the same instantaneous velocity upon entering the solvent, larger particles, due to their shorter sinking time, travel a shorter horizontal distance and settle first compared to smaller particles. This allows for preliminary screening of the raw materials, preventing sieve blockage caused by particles of varying sizes. Preliminary screening separates the raw materials, facilitating further screening, and the solvent also cleans the materials.

[0040] Under the influence of solvent flow, depending on particle size and other factors, larger particles are more likely to fall into the solvent. Figure 1 As shown in the left-hand sieve 31, small particles are more likely to fall into the right-hand sieve 31, thus completing the initial screening.

[0041] The screening tank 31 is equipped with a rotating rod assembly 5, which includes a main rod 51 that can rotate around its own axis. Specifically, a cover plate 14 is installed on the upper end of the screening tank 1. The upper end of the main rod 51 passes through the cover plate 14 and is connected by a bearing. A drive component 8 is connected to the upper end of the main rod 51. The drive component 8 includes a gear pair and a motor 81. The gear pair includes a first gear 81 and a second gear 82. The output end of the motor 81 is connected to the first gear 81. The second gear 82 meshes with the outer side of the first gear 81. There are two second gears 82 arranged on the left and right sides. The second gear 82 is fitted into the main rod 51, and the motor 81 drives the main rod 51 to rotate.

[0042] The lower end of the main rod 51 is inserted into the screen groove 31, and its bottom passes through the screen plate 3, as shown. Figure 2 As shown, a support rod 53 is installed at the bottom of the main rod 51. The support rod 53 extends radially outward along the main rod 51, is fixed to the main rod 51, and rotates with the main rod 51. The upper end of the support rod 53 is provided with multiple slots 531. A spring 55 is installed in the slot 531. The lower end of the spring 55 abuts against the inner wall of the bottom of the slot 531, and the upper end of the spring 55 abuts against a push rod 54. The push rod 54 is inserted into the slot 531 and can move up and down along the inner wall of the slot 531. The upper end of the push rod 54 extends out of the slot 531.

[0043] The sieve disc 3 includes sieve holes 32, which are used for further sieving. A top rod 54 is located below the sieve holes 32, which are located at the bottom of the sieve trough 31 and extend vertically. Multiple sieve holes 32 are arranged radially along the bottom surface of the sieve trough 31 and are evenly distributed circumferentially. The top rods 54 are also arranged radially along the bottom surface of the sieve trough 31 and correspond one-to-one with the sieve holes 32 in the same radial direction. Figure 2 As shown, three screen holes 32 are provided on one radial side of the bottom surface of the screen groove 31, and three corresponding top rods 54 are also provided.

[0044] The sieve hole 32 includes a conical hole portion 321 located at the bottom. The upper end of the push rod 54 is circular. When the push rod 54 rotates to the bottom of the sieve hole 32, it can extend into the conical hole portion 321. When the push rod 54 rotates away from the bottom of the sieve hole 32, it can extend out of the conical hole portion 321. When the push rod 54 extends into the sieve hole 32 to its limit position, the upper part of the push rod 54 is located inside the conical hole portion 321, so that the push rod 54 can slide out along the side wall of the conical hole portion 321 if it continues to rotate. When the sieve hole 32 is blocked, the push rod 54 can push it upward.

[0045] The main rod 51 is also equipped with a lever 52, which rotates with the main rod 51. The lever 52 is located above the bottom surface of the screen trough 31. The lever 52 and the top rod 54 are located on opposite sides of the main rod 51. Figure 2The particle 6 shown is the largest particle that can pass through the sieve hole 32. The distance between the bottom surface of the lever 52 and the bottom surface of the sieve groove 31 is set to two-thirds to three-quarters of the diameter of the particle 6. Since raw material particles close to the size of the particle 6 are not easy to pass through the sieve hole 32, the lever 52 is set to stir. In addition to stirring, it helps the raw material particles in the sieve groove 31 to enter the sieve hole 32. It can also exert downward pressure on these larger raw material particles, so that they can pass through the sieve hole 32 quickly, reduce clogging, and reduce the cleaning frequency.

[0046] like Figure 1 As shown, the main rod 51 near the feed hopper 2 (i.e., the left side) is also equipped with blades 7. The blades 7 are spiral-shaped. Since the particles in the screen trough 31 on this side are relatively large, in order to ensure that the smaller particles can enter the screen hole 32, the blades 7 are set to stir and tumble in the screen trough 31.

[0047] The bottom of the screening tank 1 is provided with a flow channel opening 313, which is located below the screen trough 31. The lower end of the screen hole 32 is connected to the flow channel opening 313, and the bottom of the flow channel opening 313 is controlled to open and close by a control valve 317.

[0048] A screening process, including the above-mentioned screening device, comprises the following steps:

[0049] S1: Initial screening:

[0050] The flow channel 13 is closed, while the flow channel 11 and the flow channel 2 are opened. The solvent flows from the flow channel 11 to the flow channel 2. The feed hopper 2 feeds the raw material, which is separated and cleaned under the action of the solvent. Large particles fall into the sieve 31 on the left and small particles fall into the sieve 31 on the right.

[0051] S2: Secondary screening:

[0052] Feeding hopper 2 stops feeding, flow channel 12 is closed, flow channel 13 is opened, solvent flows from flow channel 11 through sieve 31 and finally flows out from flow channel 13. Motor 83 starts, main rod 51 rotates and drives lever 52 and support rod 53 to rotate. Under the downward flow of solvent and the action of lever 52, the screened raw material particles are sent out from the lower end of sieve hole 32.

[0053] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A screening process using a screening device, characterized in that: The screening device includes a screening pool (1), a screen plate (3) installed at the bottom of the screening pool (1), a screen groove (31) provided on the screen plate (3), a flow channel opening one (11) and a flow channel opening two (12) respectively provided on both sides of the screening pool (1), the bottom of the flow channel opening one (11) and the flow channel opening two (12) being higher than the screen plate (3), a feed hopper (2) provided above one side of the screening pool (1), and the screen groove (31) located on the side of the screening pool (1) away from the feed hopper (2), and multiple screen grooves (31) are arranged along the direction away from the feed hopper (2); The screen groove (31) is provided with a rotating rod assembly (5), which includes a main rod (51) that can rotate around its own axis. The main rod (51) is inserted into the screen groove (31) and its bottom passes through the screen plate (3). A support rod (53) is installed at the bottom of the main rod (51) and rotates with the main rod (51). The upper end of the support rod (53) is provided with multiple slots (531), and a spring (55) is provided in each slot (531). The lower end of the spring (55) is connected to the slot. (531) The bottom inner wall abuts against the spring (55) and the upper end of the spring (55) abuts against the top rod (54). The top rod (54) is partially inserted into the groove (531) and can move up and down along the inner wall of the groove (531). The sieve plate (3) includes a sieve hole (32). The sieve hole (32) is located at the bottom of the sieve groove (31). When the top rod (54) rotates to below the sieve hole (32), it can extend into the bottom of the sieve hole (32). When the top rod (54) rotates to leave below the sieve hole (32), it can extend out of the bottom of the sieve hole (32). The bottom of the screening tank (1) is provided with a flow channel three (13), the flow channel three (13) is located below the screen groove (31), and the lower end of the screen hole (32) is connected to the flow channel three (13); The main rod (51) is also equipped with a lever (52), which is located above the bottom surface of the sieve groove (31) and rotates with the main rod (51); The lever (52) and the support rod (53) are located on both sides of the main rod (51); The distance between the bottom surface of the lever (52) and the bottom surface of the sieve groove (31) is controlled to be two-thirds to three-quarters of the diameter of the sieve hole (32); The screening process includes the following steps: S1: Initial screening: The flow channel three (13) is closed, and the flow channel one (11) and flow channel two (12) are opened. The solvent flows from the flow channel one (11) to the flow channel two (12). The feed hopper (2) feeds the raw material. The raw material is separated and cleaned under the action of the solvent. Large particles fall into the sieve groove (31) on the side close to the feed hopper (2), and small particles fall into the sieve groove (31) on the side away from the feed hopper (2). S2: Secondary screening: The feed hopper (2) stops feeding, the second flow channel (12) is closed, the third flow channel (13) is opened, the solvent flows from the first flow channel (11) through the sieve (31) to the third flow channel (13), the main rod (51) rotates and drives the support rod (53) to rotate, and the screened raw material particles are sent out from the lower end of the sieve hole (32).

2. The screening process as described in claim 1, characterized in that: The sieve hole (32) includes a conical hole (321) at the bottom. The upper end of the push rod (54) is circular. When the push rod (54) extends into the sieve hole (32) to the limit position, the upper part of the push rod (54) is located inside the conical hole (321).

3. The screening process as described in claim 1, characterized in that: The sieve holes (32) are arranged radially along the bottom surface of the sieve groove (31) and are evenly distributed circumferentially. The top rods (54) are arranged radially along the bottom surface of the sieve groove (31) and correspond one-to-one with the sieve holes (32) in the same radial direction.

4. The screening process as described in claim 1, characterized in that: The main rod (51) near the feed hopper (2) is also equipped with blades (7), which are spiral-shaped.

5. A screening process as described in claim 1, characterized in that: The screening pool (1) is equipped with a cover plate (14) at the upper end. The upper end of the main rod (51) passes through the cover plate (14). The upper end of the main rod (51) is connected to a driving component (8). The driving component (8) includes a gear pair and a motor (83). The motor (83) can drive the main rod (51) to rotate.

6. A screening process as described in claim 1, characterized in that: The feed hopper (2) includes a flat portion (21) located at the lower end, and a discharge chamber (211) is provided in the flat portion (21).

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