Filtering device for scraper centrifugal machine

Abstract

The utility model relates to a filter device for a scraper centrifuge, which comprises a sieve basket (1) and a sieve (2), the sieve basket is in a circular truncated cone shape, and a cavity corresponding to the structure of the sieve basket (1) is formed in the sieve basket. The screen is sleeved with the screen basket and comprises a front screen plate (21) and a rear screen plate (22), the front screen plate and the rear screen plate are both in a circular truncated cone shape, the diameter of the front end of the front screen plate is smaller than that of the rear end, the diameter of the front end of the rear screen plate is smaller than that of the rear end, and the diameter of the front end of the rear screen plate (22) is equal to that of the front end of the front screen plate (21). The rear end of the front sieve plate (21) abuts against the front end of the rear sieve plate (22), and the aperture of sieve pores of the front sieve plate (21) is smaller than that of sieve pores of the rear sieve plate (22). The front sieve plate or the rear sieve plate can be selectively replaced according to the abrasion degree of the front sieve plate and the rear sieve plate, the whole set of screen cloth does not need to be replaced, and therefore waste of materials is reduced.

Description

Technical Field

[0001] This utility model relates to the technical field of scraper centrifuge equipment, and in particular to a filtration device for scraper centrifuges. Background Technology

[0002] Salt lake brine is rich in minerals such as potassium, lithium and magnesium. Carnallite, obtained by sun-drying salt lake brine, is the main raw material for the production of potassium chloride. In the potassium chloride production process, the potassium chloride slurry needs to be separated from the solution using a scraper centrifuge.

[0003] like Figure 7 As shown, when the scraper centrifuge 3 is running, the spiral scraper 31 rotates, and the potassium chloride slurry enters the small-diameter end of the feed cone. Through centrifugal force, it passes through the discharge port and is evenly distributed between the spiral scraper 31 and the filter screen 32. Under the action of centrifugal force, the liquid in the slurry passes through the filter screen 32 and is discharged from the discharge port 33. The solid in the slurry is retained on the filter screen 32. With the help of the inclination angle of the filter screen 32 and the differential speed of the spiral scraper 31, it is transferred from the small-diameter end of the filter screen 32 to the large-diameter end and discharged from the discharge port 34.

[0004] High-hardness solid particles in the material can cause severe wear to the filter screen and spiral scraper. Because the filter screen is in a high-temperature, high-halogen, and slightly acidic environment, it is corroded by high chloride ions, which further accelerates the wear rate of the filter screen, leading to frequent replacement of the filter screen. This seriously affects the production efficiency of potash fertilizer. The filter screen is expensive, which affects the company's profits.

[0005] Secondly, the material enters from the front end of the filter screen and exits from the rear end. The filtration capacity at the front end of the filter screen is significantly higher than that at the rear end. The impact force of the material on the filter screen and the load borne by the filter screen gradually decrease from the front end to the rear end. Usually, the corrosion and wear rate at the front end of the filter screen is faster and more severe than that at the rear end.

[0006] In addition, the mesh size of existing filter screens is determined by punching dies, and the size of the pores is relatively fixed. The cutting gap cannot guarantee sufficient smoothness and regular size requirements. Under high-temperature working conditions, the thermal expansion and contraction of the filter screen will cause changes in the pore size of the filter screen, which will easily cause blockage, resulting in a decrease in water permeability and a reduction in filtration efficiency.

[0007] The primary objective of this invention is to solve the problem that the front end of the filter screen in existing scraper centrifuges wears out faster than the rear end, resulting in material waste and low efficiency due to the need to replace the entire filter screen.

[0008] The second objective is to address the problem of insufficient pore smoothness in existing scraper centrifuge filter screens, which affects filtration efficiency due to thermal expansion and contraction. Utility Model Content

[0009] In order to solve the above problems, the utility model provides filter equipment for scraper centrifuge, including sieve basket 1 and screen 2, sieve basket 1 is circular table type, and the cavity corresponding with the structure of sieve basket 1 is formed in the inside. Screen 2 is set in the inside of sieve basket 1, including front sieve plate 21 and rear sieve plate 22, and front sieve plate 21 and rear sieve plate 22 are all circular table shape, and the front end diameter of front sieve plate 21 is less than the rear end diameter, and the front end diameter of rear sieve plate 22 is less than the rear end diameter, and the front end diameter of rear sieve plate 22 is same with the front end diameter of front sieve plate 21. The rear end of front sieve plate 21 and the front end of rear sieve plate 22 abut, and the aperture of the sieve hole of front sieve plate 21 is less than the aperture of the sieve hole of rear sieve plate 22.

[0010] The utility model discloses a screen 2 is composed of front sieve plate 21 and rear sieve plate 22, because the wear speed of the front end and rear end of screen 2 is different, when screen 2 appears damage and needs to be replaced, can according to the wear degree of front sieve plate 21 and rear sieve plate 22, selectively replace front sieve plate 21 or rear sieve plate 22, need not to replace whole screen 2, thereby reduce the waste of material, save maintenance cost and material cost.

[0011] Because the impact force of material to the front end of screen 2 is greater than the rear end of screen 2, leading to the corrosion wear speed of the front end of screen 2 is faster and more serious than the rear end wear speed, by setting the aperture of the sieve hole of front sieve plate 21 is less than the aperture of the sieve hole of rear sieve plate 22, can increase the strength of front sieve plate 21, improve the wear resistance and service life of front sieve plate 21, improve the filtering efficiency and effect of centrifuge.

[0012] Preferably, the aperture of the sieve hole of front sieve plate 21 is 0.1mm~0.3mm, and the aperture of the sieve hole of rear sieve plate 22 is 0.3mm~0.5mm.

[0013] Preferably, front sieve plate 21 is fixedly connected by a plurality of annular filter rings 23 and a plurality of connecting rods 24, the axis of the plurality of filter rings 23 is collinear, and the plurality of filter rings 23 are arranged at equal intervals along the axis direction of front sieve plate 21, a strip-shaped sieve hole is formed between the adjacent two filter rings 23, the connecting rod 24 is fixedly connected with each filter ring 23, and the plurality of connecting rods 24 are arranged at equal intervals along the circumference of front sieve plate 21, and rear sieve plate 22 has the same structure as front sieve plate 21.

[0014] By setting screen 2 is fixedly connected by a plurality of annular filter rings 23 through connecting rod 24, the aperture of screen 2 can be uniform and have good smoothness, thereby precise filtration of material can be realized, the interception effect of small particles is good, the material is not easy to be stuck in the aperture of screen 2, the screen 2 is prevented from being blocked, and the filtering efficiency is improved.

[0015] Preferably, the filter ring 23 comprises a filter part 231 and a support part 232, the filter part 231 is circular annular, the cross section is rectangular, and is located on the inner side of the filter ring 23; the support part 232 is circular annular, the cross section is tapered with the inner side wider and the outer side narrower, and is fixedly connected with the filter part 231.

[0016] By arranging the filter ring 23 to comprise the filter part 231 and the support part 232, and arranging the filter part 231 to have a rectangular cross section, it can ensure that the material smoothly and smoothly enters the screen holes of the screen 2, and avoid irregular crystal structures from accumulating in the screen holes. By arranging the support part 232 on the outer side of the filter part 231, the strength of the screen 2 can be increased, and the service life of the screen 2 can be prolonged.

[0017] Preferably, the thickness of the filter part 231 is 1-2 mm. By arranging the thickness of the filter part 231 to be 1-2 mm, i.e. arranging the length of the screen hole of the screen 2 to be 1-2 mm, it can prevent the path of the material during filtration from being too long, causing the material to not pass through the screen hole in time, causing serious over-wet ore, and preventing the path of the material during filtration from being too short, causing the screen 2 to wear quickly and have a low service life.

[0018] Preferably, the length of the front screen plate 21 accounts for 1 / 4-1 / 2 of the total length of the screen 2.

[0019] Preferably, the screen basket 1 comprises a plurality of fixed rods 11 and a plurality of fixed rings 12 arranged in cross, the axes of the plurality of fixed rings 12 are collinear, the plurality of fixed rings 12 are arranged at equal intervals along the axial direction of the screen basket 1, the fixed rods 11 extend along the front-rear direction of the screen basket 1 and are fixedly connected with the fixed rings 12, and the plurality of fixed rods 11 are arranged at equal intervals along the outer periphery of the screen basket 1.

[0020] The screen basket 1 can support and protect the screen 2, thereby improving the strength of the screen 2 and prolonging the service life of the screen 2.

[0021] Preferably, the materials of the front screen plate 21 and the rear screen plate 22 are both β-type titanium alloy. The β-type titanium alloy has excellent wear resistance, good corrosion resistance, and relatively low cost, and can prolong the service life of the screen basket 1. BRIEF DESCRIPTION OF DRAWINGS

[0022] Figure 1 .Overall structure schematic diagram of the screen of the scraper centrifuge;

[0023] Figure 2 .Overall structure schematic diagram of the front screen plate;

[0024] Figure 3 .Overall structure schematic diagram of the rear screen plate;

[0025] Figure 4 .Overall structure schematic diagram of the filter ring;

[0026] Figure 5 . Figure 4 A-A section structure schematic diagram in the middle;

[0027] Figure 6 . Figure 5 B in the middle Enlarged schematic diagram;

[0028] Figure 7 . Squeegee centrifuge internal structure schematic diagram.

[0029] In the figure, 1. screen basket, 11. fixed rod, 12. fixed ring, 2. screen, 21. front screen plate, 22. rear screen plate, 23. filter ring, 231. filter part, 232. support part, 24. connecting rod, 3. squeegee centrifuge, 31. spiral squeegee, 32. filter screen, 33. liquid discharge port, 34. discharge port. DETAILED DESCRIPTION

[0030] The preferred embodiments of the utility model are described in detail below with reference to the drawings.

[0031] As Figure 1 shown, the squeegee centrifuge filter device comprises a screen basket 1 and a screen 2, the screen basket 1 is in the shape of a circular truncated cone, and an internal cavity corresponding to the structure of the screen basket 1 is formed.

[0032] The screen 2 is sleeved in the screen basket 1, and comprises a front screen plate 21 and a rear screen plate 22, both the front screen plate 21 and the rear screen plate 22 are in the shape of a circular truncated cone, and the length of the front screen plate 21 accounts for 1 / 4 to 1 / 2 of the total length of the screen 2.

[0033] The front end diameter of the front screen plate 21 is smaller than the rear end diameter, the front end diameter of the rear screen plate 22 is smaller than the rear end diameter, and the front end diameter of the rear screen plate 22 is the same as the front end diameter of the front screen plate 21.

[0034] Since the wear rates of the front end and the rear end of the screen 2 are different, when the screen 2 needs to be replaced due to damage, the front screen plate 21 or the rear screen plate 22 can be selectively replaced according to the wear degree of the front screen plate 21 and the rear screen plate 22, without replacing the entire set of screen 2, thereby reducing material waste, saving maintenance and material costs.

[0035] The materials of the front screen plate 211 and the rear screen plate 222 are both β-type titanium alloy. The β-type titanium alloy has excellent wear resistance, good corrosion resistance and relatively low cost, and can prolong the service life of the screen basket 1.

[0036] The rear end of the front screen plate 21 and the front end of the rear screen plate 22 abut, and the porosity of the screen holes of the front screen plate 21 is smaller than the porosity of the screen holes of the rear screen plate 22. In this embodiment, the porosity of the screen holes of the front screen plate 21 is 0.1mm to 0.3mm, and the porosity of the screen holes of the rear screen plate 22 is 0.3mm to 0.5mm.

[0037] Due to the impact force of the material on the front end of the screen 2 is greater than the rear end of the screen 2, resulting in the corrosion and wear rate of the front end of the screen 2 is faster and more serious than the rear end wear rate, by setting the screen hole of the front screen plate 21 The porosity of the screen hole of the rear screen plate 22 is smaller, not only can increase the strength of the front screen plate 21, and by setting the screen hole of the screen basket 1 from front to back gradually expanding, can guarantee the moisture content of the filter cake, improve the filtering efficiency and effect of the centrifuge.

[0038] As shown in Figure 2 The screen basket 1 comprises a plurality of fixed rods 11 and a plurality of fixed rings 12 arranged in cross, and the fixed ring 12 is a circular ring.

[0039] The axes of the plurality of fixed rings 12 are collinear and are arranged equidistantly along the axial direction of the screen basket 1.

[0040] The fixed rod 11 extends along the front-rear direction of the screen basket 1 and is fixedly connected with each fixed ring 12.

[0041] The plurality of fixed rods 11 are arranged equidistantly along the outer periphery of the screen basket 1.

[0042] By arranging the screen basket 1 to comprise a plurality of fixed rods 11 and a plurality of fixed rings 12 arranged in cross, the screen 2 can be supported and protected by the screen basket 1, thereby improving the strength of the screen 2 and prolonging the service life of the screen 2.

[0043] As shown in Figure 3 The front screen plate 21 is fixedly connected by a plurality of circular annular filter rings 23 and a plurality of connecting rods 24, the axes of the plurality of filter rings 23 are collinear and are arranged equidistantly along the axial direction of the front screen plate 21, and the strip-shaped screen hole is formed between the adjacent two filter rings 23.

[0044] The connecting rod 24 is fixedly connected with each filter ring 23, and the plurality of connecting rods 24 are arranged equidistantly along the circumference of the front screen plate 21.

[0045] The porosity of the screen hole refers to the distance between the adjacent two fixed rings 12.

[0046] As shown in Figure 4 The rear screen plate 22 has the same structure as the front screen plate 21, which will not be described here.

[0047] By arranging the front screen plate 21 and the rear screen plate 22 to be fixedly connected by a plurality of circular annular filter rings 23 through connecting rods 24, the porosity of the screen 2 can be uniform and the smoothness is good, thereby the material can be precisely filtered, the interception effect of the fine particle material is good, the material is not easy to be stuck in the porosity of the screen 2, the possibility of blockage is reduced, and the filtering efficiency is improved.

[0048] As shown in Figure 5 And Figure 6As shown, the filter ring 23 comprises a filter part 231 and a support part 232, the filter part 231 is in the shape of a circular ring and in the shape of a rectangle in cross section, and is located at the inner side of the filter ring 23.

[0049] The support part 232 is in the shape of a circular ring and in the shape of a tapered shape with a wide inner side and a narrow outer side in cross section, and is located at the outer side of the filter part 231 and is fixedly connected with the filter part 231.

[0050] By setting the filter ring 23 to comprise the filter part 231 and the support part 232, and setting the filter part 231 to be in the shape of a rectangle in cross section, it can ensure that the material smoothly and smoothly enters the screen hole of the screen 2, and avoid the accumulation of irregular crystal structures in the screen hole. By setting the support part 232 on the outer side of the filter part 231, the strength of the screen 2 can be increased, and the service life of the screen 2 can be prolonged.

[0051] The thickness W of the filter part 231 is 1-2mm.

[0052] The thickness W of the filter part 231 refers to the distance from the inner ring surface of the filter part 231 to the outer ring surface of the filter part 231, that is, the length from the inner side of the screen hole of the screen 2 to the outer side of the screen hole.

[0053] By setting the thickness of the filter part 231 to be 1-2mm, that is, setting the length of the screen hole of the screen 2 to be 1-2mm, the path of the material during filtering can be prevented from being too long, which causes the material to not pass through the screen hole in time, causing serious over-wet ore, and the problem that the material path during filtering is too short can be prevented. Accelerate the wear of the filter screen and reduce the service life.

[0054] The utility model discloses a screen 2 is composed of front screen plate 21 and rear screen plate 22, because the wear speed of the front end and the rear end of the screen 2 is different, when the screen 2 is damaged and needs to be replaced, according to the wear degree of the front screen plate 21 and the rear screen plate 22, the front screen plate 21 or the rear screen plate 22 can be selectively replaced, without replacing the whole screen 2, thereby reducing the waste of materials, saving maintenance cost and material cost.

[0055] Because the impact force of the material on the front end of the screen 2 is greater than that on the rear end of the screen 2, the corrosion and wear speed of the front end of the screen 2 is faster and more serious than that of the rear end, by setting the aperture of the screen hole of the front screen plate 21 to be smaller than the aperture of the screen hole of the rear screen plate 22, not only the strength of the front screen plate 21 can be increased, but also the aperture of the screen hole of the screen basket 1 can be gradually expanded from front to back, which can guarantee the moisture content of the filter cake and improve the filtering efficiency and effect of the centrifugal machine.

[0056] The screen 2 is fixedly connected by a plurality of annular filter rings 23 through connecting rods 24, can make the porosity of the screen 2 uniform, and the finish is good, so that the precise filtration of the material can be realized, the interception effect of the small particle material is good, the material is not easy to be stuck in the porosity of the screen 2, the possibility of blockage is reduced, and the filtering efficiency is improved. The filter ring 23 comprises a filtering part 231 and a supporting part 232, the filtering part 231 is rectangular in cross section, can ensure that the material smoothly and smoothly enters the screen hole of the screen 2, and avoids the accumulation of irregular crystal structures in the screen hole. The supporting part 232 is arranged outside the filtering part 231, can increase the strength of the screen 2, and prolong the service life of the screen 2.

[0057] It should be noted that the above examples illustrate the utility model rather than limit the utility model.

Claims

1. A filter device for a doctor centrifuge, characterized in that The screen basket (1) and the screen mesh (2), The screen basket (1) is in the shape of a circular truncated cone and has an internal cavity corresponding to the structure of the screen basket (1); The screen mesh (2) is arranged in the screen basket (1) and comprises a front screen plate (21) and a rear screen plate (22), The front screen plate (21) and the rear screen plate (22) are both in the shape of a circular truncated cone; The front end of the front screen plate (21) has a smaller diameter than the rear end. The front end of the rear screen plate (22) has a smaller diameter than the rear end, and the front end of the rear screen plate (22) has the same diameter as the front end of the front screen plate (21). The rear end of the front screen plate (21) and the front end of the rear screen plate (22) are in abutment. The screen holes of the front screen plate (21) have a smaller aperture than the screen holes of the rear screen plate (22).

2. The filter apparatus for doctor centrifuge according to claim 1, wherein The screen holes of the front screen plate (21) have an aperture of 0.1mm-0.3mm. The screen holes of the rear screen plate (22) have an aperture of 0.3mm-0.5mm.

3. The filter apparatus for doctor centrifuge according to claim 2, wherein The front screen plate (21) is fixedly connected by a plurality of annular filter rings (23) and a plurality of connecting rods (24). The axes of the plurality of filter rings (23) are collinear and are arranged at equal intervals along the axial direction of the front screen plate (21), and a strip-shaped screen hole is formed between adjacent two filter rings (23). The connecting rod (24) is fixedly connected with each filter ring (23), and a plurality of connecting rods (24) are arranged at equal intervals along the circumference of the front screen plate (21). The rear screen plate (22) has the same structure as the front screen plate (21).

4. The filter apparatus for doctor centrifuge according to claim 3, wherein The filter ring (23) comprises a filter part (231) and a support part (232), The filter part (231) is in the shape of a circular ring and has a rectangular cross section and is located on the inner side of the filter ring (23). The support part (232) is in the shape of a circular ring and has a tapered cross section with a wide inner side and a narrow outer side and is located on the outer side of the filter part (231) and is fixedly connected with the filter part (231).

5. The filter apparatus for doctor centrifuge according to claim 4, wherein The thickness of the filter part (231) is 1-2mm.

6. The filter apparatus for doctor centrifuge according to claim 5, wherein The length of the front screen plate (21) accounts for 1 / 4-1 / 2 of the total length of the screen mesh (2).

7. The filter apparatus for doctor centrifuge according to claim 6, wherein The screen basket (1) comprises a plurality of fixed rods (11) and a plurality of fixed rings (12) arranged in cross, The axes of the plurality of fixed rings (12) are collinear and are arranged at equal intervals along the axial direction of the screen basket (1). The fixed rod (11) extends along the front-rear direction of the screen basket (1) and is fixedly connected with each fixed ring (12). The plurality of fixed rods (11) are arranged at equal intervals along the circumference of the screen basket (1).

8. The filter device for a doctor centrifuge according to any one of claims 1 to 7, characterized in that The materials of the front screen plate (21) and the rear screen plate (22) are both β-type titanium alloy.

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