Centrifugal machine for dewatering chemical sludge

Abstract

The invention discloses a centrifugal machine for chemical sludge dewatering. The centrifugal machine comprises a base, a shell, a rotary drum and a pushing device. The pushing device comprises a central shaft and a scraper device; a feeding hole is formed in the central shaft; a first dispersing hole is formed in one end of the central shaft; the central shaft and the rotary drum perform differential rotation in the same direction; the scraper device comprises a scraper sleeve; a scraper unit is arranged on the peripheral wall of the scraper sleeve; the scraper units are arranged along a spiral line; a spiral blade is movably arranged between every two adjacent scraper units; the scraper unit comprises a first sliding block, a second sliding block and a scraper plate; the first sliding block is slidably arranged on the scraper sleeve in the radial direction, the second sliding block is movably arranged in the first sliding block, and a spring is connected between the second sliding block and the scraper sleeve. A torsional spring is connected between the scraper blade and the first sliding block. The other end of the spiral blade is connected with the second sliding block of the adjacent scraper unit; dynamic adaptation to changes of different sludge viscosities is achieved, the effect of removing sludge on the inner wall of the rotary drum is improved, and it is guaranteed that the rotary drum keeps high permeability and high dehydration efficiency for a long time.

Description

Technical Field

[0001] The present invention relates to the technical field of sludge treatment, and particularly to a centrifuge for dehydrating chemical sludge. Background Art

[0002] In the field of centrifugal dehydration of chemical sludge, the horizontal screw centrifuge is the core treatment equipment, and its core structure includes a rotating drum rotating at high speed and a spiral propeller rotating at a differential speed coaxially. The rotating drum realizes solid-liquid separation through a centrifugal force field, and the spiral propeller undertakes the key function of transporting the sediment to the slag discharge port. The existing technology generally adopts a fixed spiral propeller structure, in which the spiral blades maintain a constant gap (usually 0.2 - 0.5 mm) with the inner wall of the rotating drum, and realize synchronous differential rotation through rigid connection.

[0003] Due to the complex rheological properties of chemical sludge, its viscosity changes dynamically with factors such as the material composition (such as the oil phase content and the proportion of colloidal substances), the solid content (fluctuating between 20 - 50%), the pH value (3 - 11), and the temperature (40 - 80 °C). When undergoing dehydration treatment in the rotating drum, it is easy to adhere and accumulate on the inner wall surface of the rotating drum. However, the fixed spiral propeller is limited by the structural rigidity and cannot flexibly adjust the scraping effect according to the change of sludge viscosity, resulting in a decrease in the permeability of the rotating drum and a reduction in the dehydration efficiency. Summary of the Invention

[0004] The purpose of the present invention is to overcome the above-mentioned drawbacks, and provide a centrifuge for dehydrating chemical sludge, which can dynamically adapt to the changes in different sludge viscosities, improve the removal effect of sludge on the inner wall of the rotating drum, and ensure that the rotating drum maintains high permeability and high dehydration efficiency for a long time.

[0005] To achieve the above purpose, the specific solution of the present invention is as follows: A centrifuge for dehydrating chemical sludge, comprising a base, a housing provided on the base, a rotating drum rotatably provided in the housing, and a pushing device coaxially provided in the rotating drum; The pushing device includes a central shaft rotatably provided in the rotating drum and a plurality of scraper devices sequentially sleeved on the outer peripheral wall of the central shaft along the axial direction of the central shaft; the central shaft is provided with a feed hole along its axial direction; one end of the central shaft is provided with a plurality of first dispersion holes communicated with the feed hole; the central shaft rotates at a differential speed in the same direction as the rotating drum; The scraper device includes a scraper sleeve; a plurality of scraper units are provided on the outer peripheral wall of the scraper sleeve; the plurality of scraper units are arranged along a spiral line; a spiral blade is movably provided between adjacent two scraper units; each scraper unit includes a first slider, a second slider and a scraper; the first slider is slidably provided in the scraper sleeve in the radial direction, the second slider is movably provided in the first slider and is connected with the scraper sleeve by a spring; one end of the scraper is hinged to the first slider and is connected with the first slider by a torsion spring; one end of the spiral blade is slidably hinged to the first slider of the scraper unit, and the other end is connected to the second slider of the adjacent scraper unit.

[0006] Optionally, one end of the spiral blade is provided with a first convex shaft, and the other end extends with a second convex shaft; a first inclined groove is provided on the side wall of the first slider; a convex platform is provided on the side wall of the second slider; the first convex shaft is movably embedded in the first inclined groove; the second convex shaft movably penetrates into the first slider and is fixedly connected with the second slider; Mounting grooves are respectively provided on the outer peripheral wall of the scraper sleeve corresponding to each scraper unit; the first slider is slidably arranged in the mounting groove; a second inclined groove is provided on the groove wall of the mounting groove; the convex platform is movably embedded in the second inclined groove; both ends of the spring are connected between the side wall of the second slider and the groove wall of the mounting groove.

[0007] Optionally, a strip-shaped hole is provided on the side wall of the first slider; a sealing flap is slidably arranged on the inner wall of the first slider corresponding to the position of the strip-shaped hole; the second convex shaft penetrates through the sealing flap.

[0008] Optionally, second inclined grooves are provided on both opposite groove walls of the mounting groove; convex platforms are provided on both opposite side walls of the second slider.

[0009] Optionally, one end of the second slider away from the axis of the scraper sleeve abuts against the inner wall of one end of the first slider away from the axis of the scraper sleeve.

[0010] Optionally, a first step portion is provided on the inner wall of the first slider; the second slider is provided with a second step portion that cooperates with the first step portion.

[0011] Optionally, the scraper sleeve corresponding to the position of the first dispersion hole is provided with second dispersion holes that correspond one-to-one with the first dispersion holes.

[0012] Optionally, one end of the drum is a closed end, and the other end is an open end; the drum is provided with a dehydration portion; dehydration holes are evenly distributed in the dehydration portion; A first discharge port is provided at the bottom of the housing corresponding to the position of the dehydration portion of the drum, and a second discharge port is provided corresponding to the position of the open end of the drum; the first dispersion hole is provided at one end of the central shaft away from the open end of the drum.

[0013] Optionally, a conical portion is provided at the other end of the drum; the inner diameter of the conical portion gradually decreases from the closed end of the drum to the open end direction.

[0014] Optionally, a spiral extrusion piece is provided on the central shaft inside the conical portion of the drum; the pitch of the spiral extrusion piece gradually decreases from the closed end of the drum to the open end direction.

[0015] The beneficial effects of the present invention are as follows: By arranging spiral blades between adjacent two scraper units, the present invention can utilize the reverse displacement of the spiral blades caused by the change of sludge viscosity and, in cooperation with the torsion spring, drive the automatic adjustment of the scraper angle to adaptively adjust the scraping ability of the scraper, so as to dynamically adapt to the change of different sludge viscosities, improve the cleaning effect of the sludge on the inner wall of the drum, and ensure that the drum maintains high permeability and high dehydration efficiency for a long time. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 is a schematic structural diagram of the present invention; Figure 2 is a schematic sectional view of the present invention; Figure 3 is a schematic structural diagram of the pushing device of the present invention; Figure 4 is a schematic structural diagram of the scraper device of the present invention; Figure 5 is a schematic structural diagram of the scraper sleeve of the present invention; Figure 6 is a schematic structural diagram of the scraper unit of the present invention; Figure 7 is a schematic sectional view of the scraper unit of the present invention; Figure 8 is a schematic sectional view of the scraper unit from another perspective of the present invention; Figure 9 is a schematic structural diagram of the spiral blade of the present invention; DESCRIPTION OF REFERENCE NUMERALS: 1, base; 2, outer shell; 21, end cover; 22, conical groove; 23, first discharge port; 24, second discharge port; 3, drum; 31, dehydration part; 311, dehydration holes; 32, conical part; 4, pushing device; 41, central shaft; 411, feeding hole; 412, first dispersion hole; 413, spiral extrusion sheet; 42, scraper device; 421, scraper sleeve; 4211, installation groove; 4212, second inclined groove; 4213, second dispersion hole; 422, first slider; 4221, first inclined groove; 4222, strip-shaped hole; 4223, first step part; 423, second slider; 4231, boss; 4232, second step part; 424, scraper; 4241, hinge shaft; 425, spring; 426, torsion spring; 427, spiral blade; 4271, first convex shaft; 4272, second convex shaft; 428, sealing flap; 5, first motor; 6, second motor. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0017] The present invention will be further described in detail below with reference to the drawings and specific embodiments, and the scope of implementation of the present invention is not limited thereto.

[0018] As Figures 1 to 9As shown in the figure, a centrifuge for chemical sludge dewatering according to this embodiment includes a base 1, a housing 2 provided on the base 1, a drum 3 rotatably provided in the housing 2, and a pushing device 4 coaxially provided in the drum 3; The pushing device 4 includes a central shaft 41 rotatably provided in the drum 3 and a plurality of scraping device 42 sleeved on the outer peripheral wall of the central shaft 41 in sequence along the axial direction of the central shaft 41; one end of the central shaft 41 is rotatably connected to the inner wall of the drum 3, and the other end rotatably penetrates through the housing 2; a feed hole 411 is provided on the central shaft 41 along its axial direction; a plurality of first dispersion holes 412 communicating with the feed hole 411 are provided at one end of the central shaft 41; the central shaft 41 rotates at a differential speed in the same direction as the drum 3; the scraping device 42 can be freely set according to actual design requirements; The scraping device 42 includes a scraping sleeve 421; a plurality of scraping units are provided on the outer peripheral wall of the scraping sleeve 421; the number of scraping units can be freely set according to actual design requirements; the plurality of scraping units are arranged along a spiral line; a spiral blade 427 is movably provided between adjacent two scraping units; each scraping unit includes a first slider 422, a second slider 423 and a scraper 424; the first slider 422 is slidably provided on the scraping sleeve 421 in the radial direction, the second slider 423 is movably provided in the first slider 422 and a spring 425 is connected between the second slider 423 and the scraping sleeve 421; one end of the scraper 424 is hinged to the first slider 422 and a torsion spring 426 is connected between the scraper 424 and the first slider 422; one end of the spiral blade 427 is slidably hinged to the first slider 422 of the scraping unit, and the other end is connected to the second slider 423 of the adjacent scraping unit. The scraper 424 is always in contact with the inner peripheral wall of the drum 3 under the action of the torsion spring 426. By arranging each scraping device 42 in sequence along the axial direction, the spiral blades 427 and the scraping units of each scraping device 42 jointly form an axial conveying mechanism in the drum 3 to axially convey the sludge in the drum 3.

[0019] Specifically, as Figure 2 shown, when the centrifuge for chemical sludge dewatering of this embodiment is actually applied, the central shaft 41 and the drum 3 are driven to rotate at a synchronous differential speed, and the rotational speed of the drum 3 is greater than that of the central shaft 41. The sludge to be dewatered is pumped to the feed port, and the sludge enters the drum 3 through the first dispersion holes 412. The sludge entering the drum 3 is dewatered under the action of centrifugal force. At the same time, each scraping device 42 rotates following the central shaft 41, and each spiral blade 427 pushes the sludge in the drum 3 to move along the axial direction of the drum 3 to continuously carry out sewage treatment; When the sludge viscosity is low, the reaction force of the sludge in the drum 3 on the spiral blade 427 is not enough to overcome the elastic force of the spring 425 and cause the spiral blade 427 to move. At this time, the angle between the scraper 424 and the inner wall of the drum 3 is the largest, which helps the scraper 424 to fit the inner wall of the drum 3 during rotation and push the sludge to move normally. When the sludge viscosity increases, the spiral blade 427 needs to overcome an increased resistance to push the sludge to move axially, that is, the reaction force of the sludge in the drum 3 on the spiral blade 427 increases, causing the spiral blade 427 to move in the reverse direction. The reverse displacement is transmitted to the first slider 422 of the scraper unit connected thereto and the second slider 423 of the adjacent scraper unit to move, so that the first slider 422 of the scraper unit and the second slider 423 of the adjacent scraper unit move. 22 drives the scraper 424 to extend radially outward, so that the second slider 423 of the adjacent scraper unit slides relative to the first slider 422 and compresses the spring 425. Since the first slider 422 drives the scraper 424 to extend radially outward, the scraper 424 is squeezed by the inner wall of the drum 3 and deflects to overcome the torsion of the torsion spring 426, so that the angle between the scraper 424 and the inner wall of the drum 3 is reduced. At the same time, the torsion spring 426 generates a greater torsion, thereby increasing the pressure of the scraper 424 on the inner wall of the drum 3, thereby enhancing the scraper 424's ability to scrape away the sludge attached to the inner wall of the drum 3, making it easier for the sludge to fall off the inner wall of the drum 3, effectively preventing the sludge from accumulating on the inner wall of the drum 3, and helping to maintain the long-term stability of the permeability and dehydration efficiency of the drum 3.

[0020] In this embodiment, a spiral blade 427 is arranged between two adjacent scraper units, so that the reverse displacement of the spiral blade 427 caused by the change in sludge viscosity and the cooperation of the torsion spring 426 can be used to drive the scraper 424 to automatically adjust its angle, so as to adaptively adjust the scraping ability of the scraper 424, thereby dynamically adapting to the change in different sludge viscosities, improving the sludge removal effect on the inner wall of the drum 3, and ensuring that the drum 3 maintains high permeability and high dehydration efficiency for a long time.

[0021] like Figure 1 and Figure 2 As shown, in the centrifuge for dewatering chemical sludge of this embodiment, a first motor 5 is installed at one end of a base 1, and an output end of the first motor 5 is connected to one end of a drum 3 to drive the drum 3 to rotate for dehydration treatment; a second motor 6 is installed at the other end of the base 1, and an output end of the second motor 6 is connected to a central shaft 41 through a synchronous pulley set, thereby being able to drive the central shaft 41 to rotate.

[0022] like Figure 1 and Figure 2 As shown, specifically, both ends of the housing 2 are detachably connected with end covers 21, and the housing 2 and the end covers 21 together enclose a mounting cavity, so as to facilitate the assembly and disassembly of the scraper device 42 and the rotating drum 3.

[0023] likeFigures 4 to 9 As shown, in some embodiments, for the centrifuge used for chemical sludge dewatering in this embodiment, one end of the spiral blade 427 is provided with a first convex shaft 4271, and the other end extends with a second convex shaft 4272; a first inclined groove 4221 is provided on the side wall of the first slider 422; a convex platform 4231 is provided on the side wall of the second slider 423; the first convex shaft 4271 is movably embedded in the first inclined groove 4221; the second convex shaft 4272 is movably inserted into the first slider 422 and fixedly connected to the second slider 423; mounting grooves 4211 are respectively provided on the outer peripheral wall of the scraper sleeve 421 corresponding to each scraper unit; the first slider 422 is slidably arranged in the mounting groove 4211; a second inclined groove 4212 is provided on the groove wall of the mounting groove 4211; the convex platform 4231 is movably embedded in the second inclined groove 4212; both ends of the spring 425 are connected between the side wall of the second slider 423 and the groove wall of the mounting groove 4211.

[0024] Specifically, when the spiral blade 427 is subjected to the reverse force of the sludge and moves against the elastic force of the spring 425, the first convex shaft 4271 cooperates with the first inclined groove 4221 to drive the first slider 422 to extend outwards, so that the scraper 424 deflects against the torsion force of the torsion spring 426. At the same time, the spiral blade 427 drives the second slider 423 of the adjacent scraper unit to slide relative to the first slider 422 through the second convex shaft 4272. The second slider 423 of the adjacent scraper unit extends radially outwards under the cooperation of the convex platform 4231 and the second inclined groove 4212, pushing the first slider 422 to extend out, so that the scrapers 424 of the adjacent scraper units extend synchronously, thereby realizing the linkage between the scraper units and enhancing the cleaning effect on the inner wall of the drum 3.

[0025] As Figure 4 、 Figure 6 and Figure 7 As shown, in some embodiments, for the centrifuge used for chemical sludge dewatering in this embodiment, a strip-shaped hole 4222 is provided on the side wall of the first slider 422; a sealing flap 428 is slidably arranged on the inner wall of the first slider 422 corresponding to the position of the strip-shaped hole 4222; the second convex shaft 4272 penetrates through the sealing flap 428. By providing the sealing flap 428 in this embodiment, the sludge can be effectively blocked from entering the first slider 422, thereby ensuring the movement stability of the first slider 422 and the second slider 423.

[0026] As Figures 3 to 8 As shown, in some embodiments, for the centrifuge used for chemical sludge dewatering in this embodiment, second inclined grooves 4212 are provided on both opposite groove walls of the mounting groove 4211; convex platforms 4231 are provided on both opposite side walls of the second slider 423. Such a setting is made to make the sliding of the second slider 423 more stable.

[0027] As Figure 7 and Figure 8As shown in the figure, in some embodiments, for the centrifuge used for chemical sludge dewatering in this embodiment, one end of the second slider 423 away from the axis of the scraper sleeve 421 abuts against the inner wall of one end of the first slider 422 away from the axis of the scraper sleeve 421; with such a setting, when the spiral blade 427 drives the second slider 423 to slide relative to the first slider 422, the second slider 423 extends radially under the cooperation of the boss 4231 and the second inclined groove 4212, thereby synchronously lifting the first slider 422 to extend radially, so that the scraper 424 deflects against the torsion of the torsion spring 426, thereby enhancing the scraping ability of the scraper 424.

[0028] As Figure 8 As shown in the figure, in some embodiments, for the centrifuge used for chemical sludge dewatering in this embodiment, a first step portion 4223 is provided on the inner wall of the first slider 422; the second slider 423 is provided with a second step portion 4232 that cooperates with the first step portion 4223; with such a setting, when the second slider 423 extends radially outward, the second slider 423 cooperates with the first step portion 4223 through the second step portion 4232 to synchronously push the first slider 422 to extend outward, further ensuring the linkage between the first slider 422 and the second slider 423 in this way.

[0029] As Figure 7 As shown in the figure, in some embodiments, for the centrifuge used for chemical sludge dewatering in this embodiment, the scraper 424 is provided with a hinge shaft 4241, the scraper 424 is hinged to the first slider 422 through the hinge shaft 4241, the torsion spring 426 is sleeved on the outer wall of the hinge shaft 4241, and the second slider 423 is movably sleeved on the outer wall of the hinge shaft 4241; with such a setting, the linkage between the first slider 422 and the second slider 423 is further enhanced.

[0030] As Figure 2 and Figure 3 As shown in the figure, in some embodiments, for the centrifuge used for chemical sludge dewatering in this embodiment, the scraper sleeve 421 corresponding to the position of the first dispersion hole 412 is provided with second dispersion holes 4213 corresponding to the first dispersion holes 412 one by one. In this embodiment, a scraper unit is provided at the position corresponding to the first dispersion hole 412 to fully axially convey the sludge in the drum 3; the sludge in the feed port enters the drum 3 through the first dispersion hole 412 and the second dispersion hole 4213 in sequence.

[0031] For the centrifuge used for chemical sludge dewatering in this embodiment, in some embodiments, one end of the drum 3 is a closed end and the other end is an open end; the drum 3 is provided with a dewatering portion 31; the dewatering holes 311 are evenly distributed on the dewatering portion 31; a first discharge port 23 is provided at the bottom of the housing 2 corresponding to the position of the dewatering portion 31 of the drum 3, and a second discharge port 24 is provided corresponding to the position of the open end of the drum 3; the first dispersion hole 412 is provided at one end of the central shaft 41 away from the open end of the drum 3.

[0032] Specifically, the sludge enters the dehydration section 31 of the drum 3 and is dehydrated through the dehydration holes 311 on the dehydration section 31. At the same time, each scraper device 42 conveys the sludge from the closed end of the drum 3 towards its open end. The dehydrated liquid drops and is discharged through the first discharge outlet 23, while the dehydrated solid sludge is discharged to the second discharge outlet 24 and discharged through the second discharge outlet 24, so that the dehydration treatment of the sludge can be continuously carried out.

[0033] Preferably, as Figure 2 shown, a conical groove 22 is provided at the bottom of the outer shell 2 corresponding to the position of the dehydration section 31 of the drum 3, and the first discharge outlet 23 is located at the conical bottom of the conical groove 22, so that it is easier for the dehydrated liquid to be concentrated and discharged through the first discharge outlet 23.

[0034] As Figure 2 shown, in some embodiments of the centrifuge for chemical sludge dehydration in this embodiment, a conical portion 32 is provided at the other end of the drum 3; the inner diameter of the conical portion 32 gradually decreases from the closed end of the drum 3 towards the open end. Through the above setting, in this embodiment, the sludge entering the conical portion 32 is further compressed by the conical portion 32, improving the solid-liquid separation efficiency.

[0035] As Figure 2 and Figure 3 shown, in some embodiments of the centrifuge for chemical sludge dehydration in this embodiment, a spiral extrusion piece 413 is provided on the central shaft 41 within the conical portion 32 of the drum 3; the pitch of the spiral extrusion piece 413 gradually decreases from the closed end of the drum 3 towards the open end. In this embodiment, by providing the spiral extrusion piece 413, the sludge is further compressed through the combined cooperation of the spiral extrusion piece 413 and the conical portion 32, significantly improving the dehydration efficiency.

[0036] The above description is only a preferred embodiment of the present invention. Therefore, any equivalent changes or modifications made according to the structures, features, and principles described in the scope of this patent application for the present invention are included in the protection scope of this patent application for the present invention.

Claims

1. A centrifuge for dewatering chemical sludge, characterized in that: It comprises a base, a shell arranged on the base, a rotating drum rotatably arranged in the shell, and a pushing device coaxially arranged in the rotating drum; The pushing device includes a central shaft rotatably arranged in the drum and a plurality of scraper devices sequentially sleeved on the outer peripheral wall of the central shaft along the axial direction of the central shaft; the central shaft is provided with a feed hole along its axial direction; one end of the central shaft is provided with a plurality of first dispersion holes connected with the feed hole; the central shaft and the drum rotate in the same direction with a differential speed; The scraper device includes a scraper sleeve; a plurality of scraper units are arranged on the outer peripheral wall of the scraper sleeve; the plurality of scraper units are arranged along a spiral line; a spiral blade is movably arranged between two adjacent scraper units; each scraper unit includes a first slider, a second slider and a scraper plate; the first slider is radially slidably arranged on the scraper sleeve, the second slider is movably arranged in the first slider and a spring is connected between the first slider and the scraper sleeve; one end of the scraper plate is hinged to the first slider and a torsion spring is connected between the first slider; one end of the spiral blade is slidably hinged to the first slider of the scraper unit, and the other end is connected to the second slider of the adjacent scraper unit.

2. A centrifuge for dewatering chemical sludge according to claim 1, characterized in that: The spiral blade has a first convex shaft at one end and a second convex shaft extending from the other end; a first inclined groove is provided on the side wall of the first slider; a boss is provided on the side wall of the second slider; the first convex shaft is movably embedded in the first inclined groove; the second convex shaft is movably inserted into the first slider and fixedly connected to the second slider; The outer wall of the scraper sleeve is provided with a mounting groove corresponding to each scraper unit; the first slider is slidably arranged in the mounting groove; the groove wall of the mounting groove is provided with a second inclined groove; the boss is movably embedded in the second inclined groove; the two ends of the spring are connected between the side wall of the second slider and the groove wall of the mounting groove.

3. A centrifuge for dewatering chemical sludge according to claim 2, characterized in that: A strip hole is arranged on the side wall of the first sliding block; a sealing baffle is slidably arranged on the inner wall of the first sliding block at a position corresponding to the strip hole; and the second convex shaft penetrates the sealing baffle.

4. A centrifuge for dewatering chemical sludge according to claim 2, characterized in that: The two opposite groove walls of the installation groove are both provided with a second inclined groove; the two opposite side walls of the second sliding block are both provided with a boss.

5. A centrifuge for dewatering chemical sludge according to claim 1, characterized in that: One end of the second sliding block away from the axis of the scraper sleeve abuts against the inner wall of one end of the first sliding block away from the axis of the scraper sleeve.

6. A centrifuge for dewatering chemical sludge according to claim 1, characterized in that: The inner wall of the first sliding block is provided with a first step portion; the second sliding block is provided with a second step portion matching with the first step portion.

7. A centrifuge for dewatering chemical sludge according to claim 1, characterized in that: The scraper sleeve corresponding to the position of the first dispersion hole is provided with second dispersion holes corresponding to the first dispersion holes one by one.

8. A centrifuge for dewatering chemical sludge according to claim 1, characterized in that: One end of the rotary drum is a closed end, and the other end is an open end; the rotary drum is provided with a dehydration part; the dehydration part is uniformly distributed with dehydration holes; The bottom of the shell is provided with a first outlet corresponding to the dehydration part of the drum, and a second outlet corresponding to the opening end of the drum; the first dispersion hole is provided at one end of the central axis away from the opening end of the drum.

9. A centrifuge for dewatering chemical sludge according to claim 8, characterized in that: A conical portion is provided at the other end of the rotary drum; the inner diameter of the conical portion gradually decreases from the closed end to the open end of the rotary drum.

10. A centrifuge for dewatering chemical sludge according to claim 9, characterized in that: The central axis is provided with a spiral extrusion sheet in the conical portion of the drum; the pitch of the spiral extrusion sheet gradually decreases from the closed end to the open end of the drum.

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