Bottom discharge scraper centrifuge

Abstract

The present invention relates to a bottom-discharging scraper centrifuge, comprising a base, an axle seat, a rotating shaft, a rotating drum, a driving device, a casing and a feeding pipe. A discharging port is provided at the center of the bottom surface of the rotating drum, a discharge hole corresponding to the discharging port is provided on the base, a lifting limit column is coaxially connected to the upper end of the rotating shaft, a lifting sleeve is slidably sleeved on the lifting limit column, a closing cover is connected to the lower end of the lifting sleeve, a limiting ring is connected to the upper end of the lifting limit column, a positioning ring is connected to the top of the lifting sleeve, a supporting arm is fixedly connected to the casing, a swing rod is rotatably connected to the supporting arm, one end of the swing rod extends to both sides of the lifting sleeve below the positioning ring, the other end of the swing rod is connected to a piston cylinder connected to the base, the piston cylinder drives the swing rod to swing in a vertical plane, a vertically arranged positioning pin is fixedly connected to one end of the swing rod close to the lifting sleeve, a positioning hole corresponding to the positioning pin is provided on the positioning ring, and the positioning pin can be inserted into the positioning hole as the swing rod swings upward.

Description

Technical Field

[0001] The invention belongs to the technical field of solid-liquid separation equipment, and in particular relates to a bottom-discharging scraper centrifuge. Background Art

[0002] In the process of centrifugal separation of monosodium glutamate finished products, the monosodium glutamate industry generally uses centrifuges with automatic scraper bottom discharge. During the slow rotation of the centrifuge, the filter cake (monosodium glutamate) is scraped off by the lifting and rotating movement of the scraper. The lifting and rotating drive of the scraper is completed by the lifting mechanism, rotating mechanism and corresponding lifting cylinder and rotating cylinder drive.

[0003] In the process of scraping the filter cake (MSG), there is also a conical closed cover driven by a cylinder to do lifting and lowering movement to cooperate with the scraping. When the closed cover rises, the discharge port at the bottom of the drum is exposed, and then the scraper is lifted and rotated to scrape the filter cake (MSG), and the filter cake (MSG) is discharged from the discharge port. Its advantages are high degree of automation, and its disadvantages are complex structure, easy vibration, and high cost of use and maintenance. Therefore, it is necessary to provide a bottom discharge scraper centrifuge with high degree of automation, simpler structure and better stability. Summary of the invention

[0004] The technical problem to be solved by the present invention is to provide a bottom-discharging scraper centrifuge with a simple structure.

[0005] In order to solve the above technical problems, the technical solution adopted by the present invention is: a bottom-discharging scraper centrifuge, comprising a base, a shaft seat vertically arranged on the base, a rotating shaft rotatably connected in the shaft seat and with both ends extending out of the shaft seat, a rotating drum connected to the upper end of the rotating shaft, a driving device drivingly connected to the lower end of the rotating shaft for driving the rotating shaft to rotate, a casing connected to the base and covering the rotating drum, and a feed pipe connected to the casing, wherein the lower end of the feed pipe is inserted into the rotating drum, the upper end of the feed pipe is extended out of the casing, and the center of the bottom surface of the rotating drum is A discharge port is provided, and a discharge hole corresponding to the discharge port is provided on the base located directly below the drum. The shaft seat is arranged in the middle of the discharge hole and is fixedly connected to the inner wall of the discharge hole through a connecting beam. All discharge ports are located within the range of the discharge hole. A lifting limit column is coaxially connected to the upper end of the rotating shaft, and a lifting sleeve is slidably sleeved on the lifting limit column. A conical cylindrical closing cover is connected to the lower end of the lifting sleeve. The lower end of the closing cover is opposite to the discharge port and covers the discharge port to open or close the discharge port. The cam is connected with a support arm on the upper end of the casing and a support arm is connected with a swivel rod on the upper end of the casing, and a swivel rod is connected with a swivel rod on the lower end of the casing, and a swivel rod is connected with a swivel rod on the upper end of the casing, and a swivel rod is connected with a swivel rod on the lower end of the casing.

[0006] As a preferred embodiment, at least one material guide port is provided on the outer edge of the lower end of the closed cover, and the lower scraper is arranged in one-to-one correspondence with the material guide port. The lower scraper is a vertically arranged plate, which is inserted on one side of the corresponding material guide port, one end of the lower scraper is close to the inner wall of the drum, and the other end passes through the material guide port and is inserted into the closed cover. The lower scraper is inclined relative to the radial direction of the drum to form an inclined cutting angle, and the lower edge of the lower scraper is connected to a horizontally arranged supporting plate (), which is inserted at the lower edge of the material guide port, one end of the supporting plate is close to the inner wall of the drum, and the other end passes through the material guide port and is inserted into the closed cover.

[0007] As a preferred solution, the upper edge of the lower scraper is connected to a cutting plate which is inclined relative to the supporting plate. The cutting plate is located directly above the supporting plate, and the side of the cutting plate away from the lower scraper is higher than the side connected to the lower scraper. One end of the cutting plate is close to the inner wall of the drum.

[0008] As a preferred solution, a support plate is vertically connected to the lower scraper or cutting plate, and an upper scraper is connected to the upper end of the support plate.

[0009] As a preferred embodiment, the closed cover includes a conical cylindrical cover body and a cylindrical cylindrical support body, the support body is fixedly connected to the lower end of the cover body, the material guide port is opened on the support body, a flange ring is connected to the lower end of the support body, and the edge of the discharge port of the drum is provided with an annular groove matching the flange ring. When the closed cover descends, the flange ring is embedded in the annular groove.

[0010] As a preferred solution, the limit ring is rotatably connected to the lifting limit column via a bearing, and the limit ring is fixedly connected to the casing via a plurality of circumferentially distributed support rods.

[0011] The beneficial effects of the present invention are as follows: the present invention connects the lower scraper to the closed cover, and uses the piston cylinder that drives the closed cover to move up and down to drive the lower scraper to move up and down. At the same time, the relative rotation between the closed cover and the drum is realized by setting a positioning pin on the swing rod that drives the closed cover to move up and down, and setting a positioning hole that cooperates with the positioning pin on the positioning ring, thereby simplifying the scraper mechanism of the centrifuge. The material guide port is provided on the closed cover, and the supporting plate and the cutting plate are provided to prevent the scraped filter cake from falling on the bottom surface of the drum and reduce the filter residue, so that the bottom of the drum can be designed to be horizontal to reduce the height of the drum. The upper scraper is provided above the lower scraper, which can greatly improve the scraping efficiency, reduce the lifting distance of the closed cover, reduce the telescopic stroke of the piston cylinder, and reduce the equipment cost. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] The specific embodiments of the present invention are further described in detail below with reference to the accompanying drawings, wherein:

[0013] Figure 1 It is a schematic diagram of the structure of the present invention;

[0014] Figure 2 is a top view of the lifting sleeve and the closing cover;

[0015] Figure 3 is a top view of the pendulum;

[0016] Figure 4 It is a schematic diagram of the relative position of the lower scraper and the drum and the scraping state;

[0017] Figure 1~Figure 4In: 1. base, 2. shaft seat, 3. rotating shaft, 4. drum, 5. driving device, 6. casing, 7. discharge port, 8. feed pipe, 9. discharge hole, 10. connecting beam, 11. lifting limit column, 12. lifting sleeve, 13. closing cover, 1291, cover body, 1292, support body, 1293, flange ring, 14. material guide port, 15. supporting plate, 16. lower scraper, 17. limit ring, 18. positioning ring, 19. support arm, 20. rocker arm, 21. piston cylinder, 22. piston rod, 22. positioning pin, 23. positioning hole, 24. through hole, 25. support plate, 26. upper scraper, 27. bearing, 28. support rod, 29. annular groove, 30. liquid storage chamber, 31. discharge pipe, 32. cutting plate, 33. filter cake. DETAILED DESCRIPTION

[0018] The specific embodiments of the present invention are described in detail below in conjunction with the accompanying drawings.

[0019] like Figure 1~Figure 4As shown, the bottom-discharging scraper centrifuge comprises a base 1, a shaft seat 2 vertically arranged on the base 1, a rotating shaft 3 rotatably connected in the shaft seat 2 and with both ends extending out of the shaft seat 2, a rotating drum 4 connected to the upper end of the rotating shaft 3, a driving device 5 drivingly connected to the lower end of the rotating shaft 3 for driving the rotating shaft 3 to rotate, a casing 6 connected to the base 1 and covering the rotating drum 3, and a feeding pipe 8 connected to the casing 6, wherein the lower end of the feeding pipe 8 is inserted into the rotating drum 4, and the upper end thereof extends out of the casing 6, and a rotating drum 4 and the casing 6 are formed between the rotating drum 4 and the casing 6. An annular liquid storage chamber 30 is provided on the base 1 with a discharge pipe 31 connected to the liquid storage chamber 30. A discharge port 7 is provided at the center of the bottom surface of the drum 4. A discharge hole 9 corresponding to the discharge port 7 is provided on the base 1 directly below the drum 4. The shaft seat 2 is provided in the middle of the discharge hole 9 and is fixedly connected to the inner wall of the discharge hole 9 through a connecting beam 10. The connecting beam 10 extends across the discharge hole 9 and only occupies a part of the flow area of ​​the discharge hole 9. Therefore, the filter cake can be discharged smoothly through the discharge hole 9. All discharge ports 7 are located within the range of the discharge hole 9 to ensure that the filter cake in the drum 4 completely falls into the discharge hole 9 through the discharge port 7. A lifting limit column 11 is coaxially connected to the upper end of the rotating shaft 3. The lifting limit column 11 rotates synchronously with the rotating shaft 3. A lifting sleeve 12 is slidably sleeved on the lifting limit column 11. The lower end of the lifting sleeve 12 is connected to a conical cylindrical closing cover 13. The lower end of the closing cover 13 is opposite to the discharge port 7 and when the lifting sleeve 12 is at the bottom, the closing cover 13 covers the discharge port 7 to open or close the discharge port 7. The upper end of the closing cover 13 is fixedly connected to the lower end of the lifting sleeve 12. When not affected by external force, the closing cover 13 and the lifting sleeve 12 descend to the bottom under the action of their own weight. The closing cover 13 covers the discharge port 7. Under the action of friction, the closing cover 13 and the lifting sleeve 12 rotate synchronously with the rotating drum 4. A limiting ring 17 is connected to the upper end of the lifting limit column 11, the axial length of the lifting sleeve 12 is smaller than the axial length of the lifting limit column 11 to achieve relative movement of the two in the axial direction, and a positioning ring 18 is connected to the top of the lifting sleeve 12. A through hole 24 is opened at the upper end of the casing 6, and the lifting limit column 11 and the lifting sleeve 12 are both arranged in the through hole 24. In this embodiment, the upper ends of the lifting limit column 11 and the lifting sleeve 12 also extend upward from the through hole 24. A support arm 19 is fixedly connected to the casing 6, and a swing rod 20 is rotatably connected to the support arm 19. The middle part of the swing rod 20 is connected to the support arm 19, such as Figure 3As shown, the swing rod 20 is in a fork shape, with one end being single-headed and the other end being double-headed. The double-headed end of the swing rod 20 extends to both sides of the lifting sleeve 12 below the positioning ring 18. The single-headed end of the swing rod 20 is connected to a piston cylinder 21 connected to the base 1. The piston cylinder 21 drives the swing rod 20 to swing in a vertical plane. One end (double-headed end) of the swing rod 20 close to the lifting sleeve 12 is fixedly connected with two vertically arranged positioning pins 22. The two positioning pins 22 are respectively connected to the two heads of the double-headed end of the swing rod 20. The two positioning pins 22 are arranged on both sides of the lifting sleeve 12, and the positioning ring 18 is provided with positioning holes 23 corresponding to the positioning pins 22. In this embodiment, the positioning ring 18 is provided with four positioning holes 23, which are evenly distributed on the positioning ring 18 in the circumferential direction. Each positioning hole 23 is a waist-shaped hole. The two positioning pins 22 can be inserted into the two positioning holes 23 as the swing rod 20 swings upward. The swing rod 20 is used to drive the lifting sleeve 12 to rise along the lifting limit column 11. The lower end outer edge of the closed cover is connected to the lower scraper 16. When the positioning pin 22 is inserted into the positioning hole 23, the positioning pin 22 limits the rotation of the lifting sleeve 12 and the closed cover 13. At this time, the rotating drum 4 will form a relative movement between the lower scraper 16 and the drum 4, thereby scraping the filter cake on the inner wall of the drum 4.

[0020] In this embodiment, the driving device 5 is a motor.

[0021] like Figure 2 As shown, two material guide ports 14 are provided at the outer edge of the lower end of the closed cover 13, and a lower scraper 16 is inserted in any material guide port 14. The lower scraper 16 is a vertically arranged plate, which is inserted at one side of the material guide port 14, one end of the lower scraper 16 is close to the inner wall of the drum 4, and the other end passes through the material guide port 14 and is inserted into the closed cover 13. A horizontally arranged supporting plate 15 is connected to the lower edge of the lower scraper 16, and the supporting plate 15 is inserted at the lower edge of the material guide port 14, one end of the supporting plate 15 is close to the inner wall of the drum 4, and the other end passes through the material guide port 14 and is inserted into the closed cover 13. Figure 4 As shown, the lower scraper 16 is tilted relative to the radial direction of the drum 4 to form an inclined cutting angle α. In this embodiment, the two ends of the support plate 15 are aligned with the two ends of the lower scraper 16 in the vertical direction.

[0022] In this embodiment, it is further preferred that a cutting plate 32 is connected to the upper edge of the lower scraper 16 and is arranged obliquely relative to the support plate 15. The cutting plate 32 is located directly above the support plate 15, and the side of the cutting plate 32 away from the lower scraper 16 is higher than the side connected to the lower scraper 16, so as to cooperate with the lower scraper 16 that rises spirally relative to the drum 4. One end of the cutting plate 32 is close to the inner wall of the drum 4, and is used to cut the filter cake. In actual use, the cutting edge of the cutting plate 32 can be set in front of the cutting edge of the lower scraper 16, so that the cutting plate 32 cuts the filter cake first, and then the lower scraper 16 scoops up the filter cake below the cut, thereby reducing the formation of filter residue.

[0023] As a further preferred solution, a support plate 25 is vertically connected to the lower scraper 16 or the cutting plate 32, and an upper scraper 26 is connected to the upper end of the support plate 25. In this embodiment, the support plate 25 is connected to the cutting plate 32.

[0024] When the lower scraper 16 scrapes the material, the scraped filter cake falls onto the support plate 15 like a continuous strip of fruit peel and moves along the support plate 15 and the lower scraper 16 to the guide port 14, and finally passes through the guide port 14 and falls into the discharge port 7, thereby keeping the bottom surface of the drum 4 clean, reducing the residual filter residue on the bottom surface of the drum 4, and extending the cleaning cycle of the drum 4. In this way, a flat-bottomed drum 4 can be selected to reduce the height of the drum 4 and the height of the entire centrifuge.

[0025] The upper scraper 26 can effectively improve the cake cleaning efficiency of the centrifuge, while reducing the lifting distance of the closed cover 13, shortening the telescopic stroke of the piston cylinder 21, and reducing the equipment cost. The specific setting position of the upper scraper 26 can be adjusted according to the actual situation, so that the support plate 15 can collect the filter cake scraped by the upper scraper 26 to the greatest extent. The filter cake that partially falls directly on the bottom surface of the drum 4 is gradually cleaned by the support plate 15 when the closed cover 13 descends and resets.

[0026] like Figure 2 As shown, the closed cover 13 in this embodiment includes a conical cylindrical cover body 1301 and a cylindrical cylindrical support body 1302, the support body 1302 is fixedly connected to the lower end of the cover body 1301, the material guide port 14 is opened on the support body 1302, and a flange ring 1303 is connected to the lower end of the support body 1302. The edge of the discharge port 7 of the drum 4 is provided with an annular groove 29 that cooperates with the flange ring 1303. When the closed cover 13 descends, the flange ring 1303 is embedded in the annular groove 29.

[0027] The support body 1302 is connected to the lower end of the cover body 1301, and the material guide port 14 is opened on the support body 1302 to maintain the integrity and mechanical properties of the conical cylindrical cover body 1301, and at the same time, the size and opening direction of the material guide port 14 can be effectively controlled. A flange ring 1303 is set at the lower end of the support body 1302, and an annular groove 29 is set on the edge of the discharge port 7 of the drum 4 to improve the connection sealing between the closed cover 13 and the bottom surface of the drum 4, and improve the sealing effect of the closed cover 13 and the discharge port 7.

[0028] The limit ring 17 is rotatably connected to the lifting limit column 11 via a bearing 27 , and the limit ring 17 is fixedly connected to the housing 6 via a plurality of circumferentially distributed support rods 28 , thereby improving the stability of the limit ring 17 and the rotation stability of the lifting limit column 11 .

[0029] The working principle of the present invention is: Figure 1~Figure 4As shown, before preparing to separate the solid-liquid mixed materials, the piston cylinder 21 pushes the end of the rocker arm 20 away from the lifting sleeve 12 upward to the upper limit position (manually set), at this time, the closing cover 13 and the lifting sleeve 12 descend to the bottom under the action of their own weight, and the flange ring 1303 at the lower end of the closing cover 13 is embedded in the annular groove 29 at the edge of the discharge port 7. The two positioning pins 22 of the rocker arm 20 close to the lifting sleeve 12 are both downwardly disengaged from the positioning holes 23 on the positioning ring 18, and the driving device 5 is started. The driving device 5 drives the rotating shaft 3, the lifting limit column 11, and the rotating drum 4 to rotate, and the closing cover 13 and the lifting sleeve 12 rotate synchronously with the rotating drum 4 under the action of friction.

[0030] At this time, the feeding starts. The solid-liquid mixture is fed into the drum 4 through the feed pipe 8. The solid-liquid mixture adheres to the inner wall of the drum 4 under the action of centrifugal force. The liquid is discharged into the liquid storage chamber 30 through the filter holes on the side wall of the drum 4 and is discharged in time through the discharge pipe 31. The solid is intercepted by the drum 4 on its inner wall and gradually forms a thicker filter cake.

[0031] When the material separation is completed and the cake cleaning begins, the driving device 5 drives the drum 4 as Figure 4 The lifting sleeve 12 and the positioning ring 18 are rotated slowly in the direction shown, and at the same time, the piston cylinder 21 pulls down the end of the swing rod 20 away from the lifting sleeve 12, so that the two positioning pins 22 rise. When the positioning pins 22 are not inserted into the positioning holes 23 on the positioning ring 18, the closing cover 13 still rotates slowly with the drum 4. When the positioning pins 22 move upward and contact the bottom surface of the positioning ring 18, they encounter resistance and stop rising. At this time, the positioning pins 22 rotate relative to the positioning ring 18. When the closing cover 13 drives the lifting sleeve 12 and the positioning ring 18 to rotate until the positioning holes 23 are opposite to the positioning pins 22, the positioning pins 22 resume their rising action and are inserted into the positioning holes 23. At this point, the positioning ring 18 is restricted by the positioning pin 22 and stops rotating, driving the lifting sleeve 12, the closing cover 13, the supporting plate 15, the lower scraper 16, the cutting plate 32, and the upper scraper 26 to stop rotating, while the drum 4 is still slowly rotated under the drive of the driving device 5, so that the drum 4 and the supporting plate 15, the lower scraper 16, the cutting plate 32, and the upper scraper 26 form a relative rotation, and the lower scraper 16 and the upper scraper 26 begin to scrape the filter cake 33 on the inner wall of the drum 4. While scraping the filter cake 33, the resistance to the rise of the closing cover 13 is gradually removed. In the process of the piston cylinder 21 slowly pulling the rocker 20, the lower scraper 16, the supporting plate 15, the cutting plate 32 and the upper scraper 26 rotate in a spiral relative to the drum 4, and gradually scrape off all the filter cake 33 on the inner wall of the drum 4.

[0032] After the filter cake 33 is scraped off by the cutting plate 32 and the lower scraper 16, it moves along the supporting plate 15 and the lower scraper 16 to the guide port 14, and finally falls into the discharge port 7 through the guide port 14, and is discharged out of the centrifuge through the discharge hole 9. Part of the filter cake scraped off by the upper scraper 26 falls downward onto the supporting plate 15, and falls into the discharge port 7 through the guiding port 14 along the supporting plate 15, and is then discharged through the discharge hole 9 of the base 1, and part of it falls directly onto the inner bottom surface of the drum 4. When the closing cover 13 descends and resets, the supporting plate 15 cleans the inner bottom surface of the drum 4, and sweeps the filter cake and filter residue on the inner bottom surface of the drum 4 onto the supporting plate 15 and enters the guide port 14 along the lower scraper 16 and falls into the discharge port 7.

[0033] After the filter cake is removed, prepare for the next solid-liquid separation.

[0034] The above embodiments are only illustrative of the principles and effects of the invention, as well as some embodiments of its application, and are not intended to limit the invention. It should be pointed out that a person skilled in the art can make several modifications and improvements without departing from the inventive concept of the invention, and all of these belong to the protection scope of the invention.

Claims

1. A bottom-discharging scraper centrifuge, comprising a base (1), a shaft seat (2) vertically arranged on the base (1), a rotating shaft (3) rotatably connected in the shaft seat (2) and with both ends extending outside the shaft seat (2), a rotating drum (4) connected to the upper end of the rotating shaft (3), a driving device (5) drivingly connected to the lower end of the rotating shaft (3) for driving the rotating shaft (3) to rotate, a casing (6) connected to the base (1) and covering the rotating drum (4), and a feed pipe (8) connected to the casing (6). ), the lower end of the feed pipe (8) is inserted into the drum (4), and the upper end extends out of the casing (6). A discharge port (7) is provided at the center of the bottom surface of the drum (4). A discharge hole (9) corresponding to the discharge port (7) is provided on the base (1) located directly below the drum (4). The shaft seat (2) is arranged in the middle of the discharge hole (9) and is fixedly connected to the inner wall of the discharge hole (9) through a connecting beam (10). All discharge ports (7) are located within the range of the discharge hole (9). The invention is characterized in that The upper end of the rotating shaft (3) is coaxially connected to a lifting limit column (11), a lifting sleeve (12) is slidably sleeved on the lifting limit column (11), and the lower end of the lifting sleeve (12) is connected to a conical cylindrical closing cover (13), the lower end of the closing cover (13) is directly opposite to the discharge port (7) and covers the discharge port (7) to open or close the discharge port (7), the upper end of the closing cover (13) is fixedly connected to the lower end of the lifting sleeve (12), the upper end of the lifting limit column (11) is connected to a limiting ring (17), the axial length of the lifting sleeve (12) is smaller than the axial length of the lifting limit column (11), and the top end of the lifting sleeve (12) is connected to a positioning ring (18), the upper end of the housing (6) is provided with a through hole (24), the lifting limit column (11) and the lifting sleeve (12) are both arranged in the through hole (24), and the housing (6) is fixedly connected to a support A support arm (19) is rotatably connected to a swing rod (20), the middle part of the swing rod (20) is connected to the support arm (19), one end of the swing rod (20) extends to one or both sides of the lifting sleeve (12) below the positioning ring (18), the other end of the swing rod (20) is connected to a piston cylinder (21) connected to the base (1), the piston cylinder (21) drives the swing rod (20) to swing in a vertical plane, one end of the swing rod (20) close to the lifting sleeve (12) is fixedly connected to at least one vertically arranged positioning pin (22), the positioning ring (18) is provided with a positioning hole (23) corresponding to the positioning pin (22), the positioning pin (22) can be inserted into the positioning hole (23) as the swing rod (20) swings upward, the swing rod (20) is used to drive the lifting sleeve (12) to rise along the lifting limit column (11), and the lower end outer edge of the closing cover is connected to a lower scraper (16).

2. The bottom discharge scraper centrifuge according to claim 1, characterized in that: At least one material guide opening (14) is provided at the outer edge of the lower end of the closed cover (13); a lower scraper (16) is arranged in one-to-one correspondence with the material guide opening (14); the lower scraper (16) is a vertically arranged plate; the lower scraper (16) is plugged into one side of the corresponding material guide opening (14); one end of the lower scraper (16) is close to the inner wall of the drum (4); the other end passes through the material guide opening (14) and is inserted into the closed cover (13); the lower scraper (16) is inclined relative to the radial direction of the drum (4) to form an inclined cutting angle; the lower edge of the lower scraper (16) is connected to a horizontally arranged supporting plate (15); the supporting plate (15) is plugged into the lower edge of the material guide opening (14); one end of the supporting plate (15) is close to the inner wall of the drum (4); the other end passes through the material guide opening (14) and is inserted into the closed cover (13).

3. The bottom discharge scraper centrifuge according to claim 2, characterized in that: The upper edge of the lower scraper (16) is connected to a cutting plate (32) which is arranged obliquely relative to the supporting plate (15). The cutting plate (32) is located directly above the supporting plate (15). The side of the cutting plate (32) away from the lower scraper (16) is higher than the side connected to the lower scraper (16). One end of the cutting plate (32) is close to the inner wall of the drum (4) and is used to cut off the filter cake.

4. The bottom discharge scraper centrifuge according to claim 3, characterized in that: A support plate (25) is vertically connected to the lower scraper (16) or the cutting plate (32), and an upper scraper (26) is connected to the upper end of the support plate (25).

5. The bottom discharge scraper centrifuge according to claim 4, characterized in that: The closed cover (13) comprises a conical cylindrical cover body (1301) and a cylindrical cylindrical support body (1302); the support body (1302) is fixedly connected to the lower end of the cover body (1301); the material guide port (14) is provided on the support body (1302); a flange ring (1303) is connected to the lower end of the support body (1302); an annular groove (29) matching with the flange ring (1303) is provided at the edge of the discharge port (7) of the rotary drum (4); when the closed cover (13) descends, the flange ring (1303) is engaged with the annular groove (29).

6. The bottom discharge scraper centrifuge according to claim 1, characterized in that: The limit ring (17) is rotatably connected to the lifting limit column (11) via a bearing (27), and the limit ring (17) is fixedly connected to the casing (6) via a plurality of circumferentially distributed support rods (28).

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