Closed bag unloading centrifuge

Abstract

The present invention relates to a closed bag-turning unloading centrifuge, comprising a base, a bearing seat and a main shaft, the main shaft is connected with a conical cap top, a drum bottom plate and a rotating basket, the base is connected with a driving motor for driving the main shaft to rotate, the upper end of the rotating basket is connected with a filter bag upper positioning ring, the outer periphery of the rotating basket is provided with an intermediate shell, the upper end of the conical cap top is connected with a positioning shaft, a sliding lifting tube is sleeved on the positioning shaft, a lifting sleeve is sleeved on the outer side of the sliding lifting tube, an outer shell is provided with an outer cover at the top of the outer shell, a sliding positioning sleeve is inserted on the top cover, the lifting sleeve is inserted in the sliding positioning sleeve, a lifting driving rod for driving the lifting sleeve to lift is connected to the outer shell, a filter cake bottom plate is connected at the lower end of the sliding lifting tube, a filter bag lower positioning ring is connected at the outer edge of the filter cake bottom plate, the upper end of the filter bag is clamped in the filter bag upper positioning groove of the filter bag upper positioning ring, and the lower end of the filter bag is clamped in the filter bag lower positioning groove of the filter bag lower positioning ring. The present invention can automatically unload from the top without opening the cover.

Description

Technical field:

[0001] The invention relates to a centrifuge, in particular to a closed bag-turning unloading centrifuge. Background technology:

[0002] Since the hanging bag centrifuge discharges from the top, it has the advantages of thorough discharge, no residual filter cake, simple structure, simple installation, convenient use and maintenance, etc., which is very popular among users and has been widely used and promoted. However, the hanging bag centrifuge must open and close the cover every time it discharges, which is cumbersome to operate, and there are disadvantages of gas leakage and material falling to the ground and polluting the environment during discharge, so its scope of use is still greatly limited.

[0003] In view of the above technical problems, it is necessary to develop a centrifuge that can automatically unload from the top but can clean and unload without opening the cover, so as to keep the workshop environment clean and tidy. Summary of the invention:

[0004] The first technical problem to be solved by the present invention is to provide a closed bag-turning unloading centrifuge which can automatically unload materials from the top without opening the cover.

[0005] In order to solve the above technical problems, the technical solution adopted by the present invention is: a closed bag-turning unloading centrifuge, comprising a base and a bearing seat connected to the base, a main shaft is rotatably connected in the bearing seat, a conical cap top is connected to the upper end of the main shaft, a ring-shaped drum bottom plate is connected to the lower edge of the conical cap top, a rotating basket coaxially arranged with the main shaft is vertically connected to the outer edge of the drum bottom plate, a driving motor for driving the main shaft to rotate is connected to the base, a large number of filter holes are provided on the rotating basket, a filter bag upper positioning ring is connected to the upper end of the rotating basket, a filter bag upper positioning groove is provided on the upper end surface of the filter bag upper positioning ring, an intermediate shell body with a lower end sealedly connected to the upper plane of the base is arranged on the periphery of the rotating basket, the upper plane of the base and the intermediate shell body form a liquid storage cavity for accommodating filtrate, and the inner diameter of the filter bag upper positioning ring is the same as that of the rotating drum bottom plate. The inner diameters of the baskets are equal, the outer diameter of the positioning ring on the filter bag is between the rotating basket and the intermediate shell, an annular cover plate is connected to the upper end of the intermediate shell, the upper end of the annular cover plate is not higher than the upper end of the positioning ring on the filter bag, the inner circumferential surface of the annular cover plate is close to the outer circumferential surface of the positioning ring on the filter bag, the upper end of the conical cap top is fixedly connected to a positioning shaft coaxially arranged with the main shaft, a sliding lifting tube is sleeved on the positioning shaft, a first axially extending guide groove is arranged on the positioning shaft, a guide key slidably inserted in the first guide groove is fixedly connected to the inner wall of the sliding lifting tube, a lifting sleeve is sleeved on the outside of the sliding lifting tube, the top end of the sliding lifting tube is rotatably connected to the top end of the lifting sleeve through a bearing, the sliding lifting tube is axially fixed relative to the lifting sleeve, and the periphery of the intermediate shell is provided with An outer shell body is fixedly connected to the upper plane of the base at the lower end, a top cover is connected to the top of the outer shell body, a sliding positioning sleeve coaxially arranged with the main shaft is inserted on the top cover, the lifting sleeve is slidably inserted in the sliding positioning sleeve, the upper end of the lifting sleeve extends out of the top cover and the sliding positioning sleeve, a lifting drive rod parallel to the main shaft is connected to the base located on one side of the outer shell body, the piston rod head of the lifting drive rod is connected to a cross beam extending toward the lifting sleeve, the upper end of the lifting sleeve is fixedly connected to the cross beam, the lower end of the sliding lifting tube extends downward out of the lifting sleeve, the lower end of the sliding lifting tube is connected to a trumpet-shaped filter cake bottom plate buckled on the conical cap top and the bottom plate of the drum, the outer edge bottom surface of the filter cake bottom plate is close to the upper surface of the bottom plate of the drum, and the outer edge of the filter cake bottom plate is connected to a filter bag The filter bag is arranged in a rotating basket, and the upper end of the filter bag is clamped in the upper positioning groove of the filter bag upper positioning ring, and the lower end of the filter bag is clamped in the lower positioning groove of the filter bag lower positioning ring. A plurality of support columns are evenly distributed on the filter cake bottom plate in a circumferential direction, and an annular liquid blocking plate is connected to the upper ends of the plurality of support columns. The outer diameter of the liquid blocking plate is larger than the inner diameter of the upper positioning ring of the filter bag. The height of the support columns satisfies that when the sliding lifting tube descends to the lowest position, the lower surface of the liquid blocking plate is just in contact with the upper surface of the upper positioning ring of the filter bag. The height of the lifting sleeve below the top cover satisfies that the lifting sleeve is always located in the sliding positioning sleeve during the unloading process. A unloading port is provided on the outer shell.

[0006] As a preferred solution, the outer shell is internally connected to an inclined annular guide plate, the lower edge of the guide plate is connected to the discharge port, the inner edge of the guide plate is sealed to the outer wall of the intermediate shell, and the outer edge of the guide plate is sealed to the inner wall of the outer shell.

[0007] As a preferred solution, the discharge port is connected to a discharge pipe extending obliquely downward, and a closable door is connected to the outer end of the discharge pipe.

[0008] As a preferred solution, a retaining ring is connected to the outer edge of the upper end of the positioning ring on the filter bag. The retaining ring is located above the annular cover plate, and the outer diameter of the retaining ring is between the inner diameter and the outer diameter of the annular cover plate.

[0009] As a preferred solution, a liquid discharge port communicating with the liquid storage chamber is provided on the base, a liquid discharge pipe communicating with the outside is connected to the liquid discharge port, and a liquid discharge valve is provided on the liquid discharge pipe.

[0010] As a preferred solution, the annular cover plate is a conical ring with a small upper opening and a large lower opening.

[0011] As a preferred solution, the upper end of the first guide groove is further connected to a second guide groove extending obliquely upward.

[0012] The beneficial effects of the present invention are as follows: the present invention arranges a filter cake bottom plate in the rotary drum, and the rise of the filter cake bottom plate drives the lower edge of the filter bag to rise and flip the filter bag. The material uses its own weight to slide down along the filter cake bottom plate to between the intermediate shell and the outer shell, and then is discharged through the discharge port. During the entire unloading process, the top cover of the outer shell does not need to be opened, and the unloading process is completed inside the outer shell. The material is still discharged from the upper opening of the rotating basket, and the discharge is complete, thereby achieving the technical goal of automatic unloading from the top without opening the cover.

[0013] The present invention further enables the material scattered between the outer shell and the middle shell to automatically slide to the discharge port for discharge through the inclined material guide plate, so that the material discharge is easier and more convenient.

[0014] The present invention further provides a discharge pipe on the discharge port and a door on the discharge pipe, so that the door can be closed when the centrifuge is in working state to avoid gas leakage and environmental pollution.

[0015] The present invention further blocks the gap between the annular cover plate and the positioning ring on the filter bag by connecting the retaining ring on the positioning ring on the filter bag, thereby preventing materials from falling into the liquid storage cavity from between the annular cover plate and the positioning ring on the filter bag to contaminate the filtrate.

[0016] The present invention further provides a drain port on the base to facilitate draining of the filtrate.

[0017] The present invention further configures the annular cover plate as a conical ring, so that the material spilled onto the annular cover plate can slide off and avoid the material from accumulating on the annular cover plate.

[0018] The present invention further provides a second guide groove extending obliquely upward at the upper end of the first guide groove. When the sliding lift tube rises to the guide key and slides into the second guide groove, the sliding lift tube rotates, driving the filter bag to twist, causing wrinkles on the filter bag, causing the residual filter cake adhering to the filter bag to break and slide between the outer shell and the intermediate shell, so that the unloading is more thorough. At the same time, due to the provision of the second guide groove, the bag turning stroke is shortened, reducing the overall height of the centrifuge. Description of the drawings:

[0019] The specific embodiments of the present invention are further described in detail below with reference to the accompanying drawings, wherein:

[0020] Figure 1 It is a structural schematic diagram of the centrifuge of the present invention;

[0021] Figure 2 yes Figure 1 A magnified view of part A in FIG.

[0022] Figure 3 yes Figure 1 A magnified view of part B in FIG.

[0023] Figure 4 yes Figure 1 The enlarged view of the C part in FIG.

[0024] Figure 5 It is a structural schematic diagram of the centrifuge of the present invention during unloading.

[0025] Figure 1 to Figure 5 Middle: 1. Base, 2. Bearing seat, 3. Main shaft, 4. Conical cap top, 5. Drum bottom plate, 6. Rotating basket, 7. Driving motor, 8. Filter hole, 9. Filter bag upper positioning ring, 10. Filter bag upper positioning groove, 11. Intermediate shell, 12. Liquid storage chamber, 13. Annular cover plate, 14. Positioning shaft, 15. Sliding lifting tube, 16. First guide groove, 17. Guide key, 18. Lifting sleeve, 19. Bearing, 20. Outer shell, 21. Top cover, 22. Sliding positioning sleeve, 2 3. lifting drive rod, 2301. piston rod, 24. crossbeam, 25. filter cake bottom plate, 26. filter bag lower positioning ring, 27. filter bag lower positioning groove, 28. filter bag, 29. support column, 30. liquid blocking plate, 31. discharge port, 32. guide plate, 33. discharge pipe, 34. door, 35. retaining ring, 36. discharge port, 37. discharge pipe, 38. discharge valve, 39. second guide groove, 40. passive wheel, 41. driving wheel, 42. belt, 43. feed pipe. Specific implementation method:

[0026] The specific embodiments of the present invention are described in detail below in conjunction with the accompanying drawings.

[0027] like Figure 1 to Figure 5 As shown, the closed bag-turning unloading centrifuge comprises a base 1 and a bearing seat 2 connected to the base 1, a main shaft 3 is rotatably connected in the bearing seat 2, the upper end of the main shaft 3 is connected to a conical cap top 4, the lower edge of the conical cap top 4 is connected to an annular drum bottom plate 5, the outer edge of the drum bottom plate 5 is vertically connected to a rotating basket 6 coaxially arranged with the main shaft, a driving motor 7 for driving the main shaft 3 to rotate is connected to the base 1, the lower end of the main shaft 3 extends downward out of the bearing seat 2 and is fixedly connected to a passive wheel 40, a driving wheel 41 is fixedly connected to the output shaft of the driving motor 7, and the driving wheel 41 and the passive wheel 40 are connected through a belt 42 for transmission, as shown in FIG. Figure 2 As shown, a large number of filter holes 8 are provided on the rotating basket 6, a filter bag upper positioning ring 9 is connected to the upper end of the rotating basket 6, and a filter bag upper positioning groove 10 is provided on the upper end surface of the filter bag upper positioning ring 9. An intermediate shell 11 is provided on the periphery of the rotating basket 6 with a lower end sealed with an upper plane of the base 1, and the upper plane of the base 1 and the intermediate shell 11 form a liquid storage cavity 12 for accommodating filtrate, the inner diameter of the filter bag upper positioning ring 9 is equal to the inner diameter of the rotating basket 6, and the outer diameter of the filter bag upper positioning ring 9 is between the rotating basket 6 and the intermediate shell 11, and an annular cover plate 13 is connected to the upper end of the intermediate shell 11, and the upper end of the annular cover plate 13 is not higher than the filter bag upper positioning ring 9. At the upper end of the ring 9, the inner circumferential surface of the annular cover plate 13 is close to the outer circumferential surface of the positioning ring 9 on the filter bag. Preferably, the spacing between the inner circumferential surface of the annular cover plate 13 and the outer circumferential surface of the positioning ring 9 on the filter bag is not greater than 8 mm. The upper end of the conical cap top 4 is fixedly connected to a positioning shaft 14 coaxially arranged with the main shaft 3, and a sliding lifting tube 15 is sleeved on the positioning shaft 14. The positioning shaft 14 is provided with an axially extending first guide groove 16, and the inner wall of the sliding lifting tube 15 is fixedly connected to a guide key 17 slidably inserted in the first guide groove 16, and the outer side of the sliding lifting tube 15 is sleeved with a lifting sleeve 18, such as Figure 4 As shown, the top of the sliding lifting tube 15 is rotatably connected with the top of the lifting sleeve 18 through a bearing 19, and the sliding lifting tube 15 is axially fixed relative to the lifting sleeve 18. The periphery of the intermediate shell 11 is provided with an outer shell 20 whose lower end is fixedly connected to the upper plane of the base 1, and the top of the outer shell 20 is connected with a top cover 21, and a sliding positioning sleeve 22 coaxially arranged with the main shaft 3 is inserted on the top cover 21, and the lifting sleeve 18 is slidably inserted in the sliding positioning sleeve 22, and the upper end of the lifting sleeve 18 extends out of the top cover 21 and the sliding positioning sleeve 22. A lifting drive rod 23 parallel to the main shaft 3 is connected to the base 1 located on one side of the outer shell 20, and the head of the piston rod 2301 of the lifting drive rod 23 is connected to a cross beam 24 extending toward the lifting sleeve 18, and the upper end of the lifting sleeve 18 is fixedly connected to the cross beam 24, and the lower end of the sliding lifting tube 15 extends downwardly out of the lifting sleeve 18, and the lower end of the sliding lifting tube 15 is connected with a trumpet-shaped filter cake bottom plate 25 buckled on the conical cap top 4 and the bottom plate 5 of the drum, as shown in FIG. Figure 3As shown, the outer edge bottom surface of the filter cake bottom plate 25 is close to the upper surface of the drum bottom plate 5. Preferably, the distance between the outer edge bottom surface of the filter cake bottom plate 25 and the upper surface of the drum bottom plate 5 is not greater than 1 cm. The outer edge of the filter cake bottom plate 25 is connected to a filter bag lower positioning ring 26. The outer diameter of the filter bag lower positioning ring 26 is smaller than the inner diameter of the rotating basket 6. The filter bag lower positioning ring 26 is provided with a filter bag lower positioning groove 27. The rotating basket 6 is provided with a filter bag 28. The upper end of the filter bag 28 is clamped in the filter bag upper positioning groove 10 of the filter bag upper positioning ring 9. The lower end of the filter bag 28 is clamped in the filter bag lower positioning ring 26. In the groove 27, a plurality of support columns 29 are evenly distributed circumferentially on the filter cake bottom plate 25, and an annular liquid blocking plate 30 is connected to the upper end of the plurality of support columns 29. The outer diameter of the liquid blocking plate 30 is larger than the inner diameter of the positioning ring 9 on the filter bag. The height of the support columns 29 satisfies that when the sliding lifting tube 15 descends to the lowest position, the lower surface of the liquid blocking plate 30 is just in contact with the upper surface of the positioning ring 9 on the filter bag. The height of the lifting sleeve 18 below the top cover 21 satisfies that the lifting sleeve 18 is always located in the sliding positioning sleeve 22 during the unloading process. A discharge port 31 is provided on the outer shell 20.

[0028] like Figure 1 As shown, an inclined annular guide plate 32 is connected to the inside of the outer shell 20, the lower edge of the guide plate 32 is connected to the discharge port 31, the inner edge of the guide plate 32 is sealed to the outer wall of the intermediate shell 11, and the outer edge of the guide plate 32 is sealed to the inner wall of the outer shell 20. The discharge port 31 is connected to a discharge pipe 33 extending obliquely downward, and the outer end of the discharge pipe 33 is connected to a closable door 34.

[0029] like Figure 2 As shown, a retaining ring 35 is connected to the outer edge of the upper end of the positioning ring 9 on the filter bag. The retaining ring 35 is located above the annular cover plate 13, and the outer diameter of the retaining ring 35 is between the inner diameter and the outer diameter of the annular cover plate 13.

[0030] like Figure 1 As shown, a liquid discharge port 36 communicating with the liquid storage chamber 12 is provided on the base 1 , a liquid discharge pipe 37 communicating with the outside is connected to the liquid discharge port 36 , and a liquid discharge valve 38 is provided on the liquid discharge pipe 37 .

[0031] like Figure 2 As shown, the annular cover plate 13 is a conical ring with a small upper opening and a large lower opening.

[0032] like Figure 1 As shown, the upper end of the first guide groove 16 is also connected to a second guide groove 39 extending obliquely upward.

[0033] The working process of the present invention is: Figure 1As shown, when it is necessary to separate the solid and liquid of the material, the top cover 21 is opened, and the material is injected into the rotating basket 6 from the upper opening of the outer shell 20 through the pipeline. After the material injection is completed, the top cover 21 is covered, and the driving motor 7 is started. The driving motor drives the main shaft 3 to rotate, and the main shaft 3 drives the conical cap top 4, the drum bottom plate 5 and the rotating basket 6 to rotate, and at the same time drives the positioning shaft 14 to rotate. The first guide groove 16 on the positioning shaft 14 drives the guide key 17 inserted therein to rotate, and the guide key drives the sliding lifting tube 15 to rotate synchronously with the main shaft 3, thereby driving the filter cake bottom plate 25 at the bottom of the sliding lifting tube 15 to rotate synchronously with the rotating basket 6, so that the upper and lower openings of the filter bag 28 rotate synchronously, and the material in the rotating basket 6 is separated. During the separation process, after the liquid material is filtered by the filter bag 28, it is thrown out from the filter hole 8 on the rotating basket 6 into the liquid storage chamber 12, and the liquid material in the liquid storage chamber 12 is discharged from the centrifuge through the discharge port 36 and the discharge pipe 37. After the separation is completed, the solid material is intercepted by the filter bag 28 and forms a filter cake on the filter bag 28.

[0034] After the solid-liquid separation is completed, the driving motor 7 is stopped, and the rotating basket 6 stops rotating. At this time, the piston rod 2301 controlling the lifting driving rod 23 extends upward, and the upper end of the piston rod 2301 drives the cross beam 24 to rise, and the cross beam 24 drives the lifting sleeve 18 to rise, and the lifting sleeve 18 drives the sliding lifting tube 15 to rise, and the guide key 17 on the inner wall of the sliding lifting tube 15 moves upward along the first guide groove 16 to guide the sliding lifting tube 15 to rise straightly, and the sliding lifting tube 15 drives the filter cake bottom plate 25 and the lower mouth of the filter bag 28 to rise, and the filter bag 28 The filter cake on the filter bag 28 gradually breaks up and falls on the filter cake bottom plate 25. When the guide key 17 moves upward and enters the second guide groove 39, the lower end of the filter bag 28 is located above the upper end of the filter bag 28. Under the weight of the filter bag 28 and the filter cake, the filter bag 28 slides downward along the inclined surface of the filter cake bottom plate 25, so that the filter bag 28 is turned outward. The filter cake on the filter bag 28 falls onto the guide plate 32 between the intermediate shell 11 and the outer shell 20, and slides along the inclined guide plate 32 to the discharge port 31, and is discharged through the discharge pipe 33.

[0035] After the guide key 17 moves upward and enters the second guide groove 39, the lifting drive rod 23 continues to drive the sliding lifting tube 15 to rise, so that the guide key 17 moves obliquely upward along the second guide groove 39, and the guide key 17 drives the sliding lifting tube 15 to rotate, and the sliding lifting tube 15 drives the filter cake bottom plate 25 to rotate, and the filter cake bottom plate 25 drives the lower mouth of the filter bag 28 to rotate, so that the entire filter bag 28 is twisted, and wrinkles are generated on the filter bag, which further promotes the filter cake and filter residue on the filter bag 28 to break and fall, so that the filter cake unloading is more thorough.

[0036] In order to further simplify the feeding process, a feed pipe 43 that can slide up and down can be set on the top cover 21. When it is necessary to transport materials into the rotating basket 6, the feed pipe 43 is moved downward so that the lower end of the feed pipe 43 is inserted into the rotating basket 6, and then the material is fed into the rotating basket 6. When the centrifuge is unloading, the feed pipe 32 is moved upward to avoid interference with the rising filter cake bottom plate 25.

[0037] 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 closed bag-turning unloading centrifuge, comprising a base (1) and a bearing seat (2) connected to the base (1), a main shaft (3) being rotatably connected inside the bearing seat (2), a conical cap top (4) being connected to the upper end of the main shaft (3), a ring-shaped drum bottom plate (5) being connected to the lower edge of the conical cap top (4), a rotating basket (6) being vertically connected to the outer edge of the drum bottom plate (5) and being coaxially arranged with the main shaft, a driving motor (7) for driving the main shaft (3) to rotate being connected to the base (1), a large number of filter holes (8) being provided on the rotating basket (6), a filter bag upper fixed portion being connected to the upper end of the rotating basket (6) A filter bag upper positioning ring (9) is provided on the upper end surface of the filter bag upper positioning ring (9), a filter bag upper positioning groove (10) is provided, an intermediate shell (11) is arranged on the periphery of the rotating basket (6), and the lower end is sealedly connected to the upper plane of the base (1), the upper plane of the base (1) and the intermediate shell (11) form a liquid storage cavity (12) for accommodating filtrate, the inner diameter of the filter bag upper positioning ring (9) is equal to the inner diameter of the rotating basket (6), the outer diameter of the filter bag upper positioning ring (9) is between the rotating basket (6) and the intermediate shell (11), and the upper end of the intermediate shell (11) is connected to an annular cover plate (13), characterized in that: The upper end of the annular cover plate (13) is not higher than the upper end of the positioning ring (9) on the filter bag, and the inner circumferential surface of the annular cover plate (13) is close to the outer circumferential surface of the positioning ring (9) on the filter bag. The upper end of the conical cap top (4) is fixedly connected to a positioning shaft (14) coaxially arranged with the main shaft (3), and a sliding lifting tube (15) is sleeved on the positioning shaft (14). The positioning shaft (14) is provided with an axially extending first guide groove (16). The inner wall of the sliding lifting tube (15) is fixedly connected to a guide key (17) slidably inserted in the first guide groove (16). The outer part of the sliding lifting tube (15) is sleeved with a lifting sleeve (18). The top end of the sliding lifting tube (15) is rotatably connected to the top end of the lifting sleeve (18) through a bearing (19). The sliding lifting tube (15) is provided with a guide key (17) slidably inserted in the first guide groove (16). 15) is axially fixed relative to the lifting sleeve (18), the outer periphery of the intermediate shell (11) is provided with an outer shell (20) whose lower end is fixedly connected to the upper plane of the base (1), the top of the outer shell (20) is connected with a top cover (21), and a sliding positioning sleeve (22) coaxially arranged with the main shaft (3) is inserted on the top cover (21), the lifting sleeve (18) is slidably inserted in the sliding positioning sleeve (22), the upper end of the lifting sleeve (18) extends out of the top cover (21) and the sliding positioning sleeve (22), and a lifting drive rod (23) parallel to the main shaft (3) is connected to the base (1) located on one side of the outer shell (20), and the head of the piston rod (2301) of the lifting drive rod (23) is connected to a cross beam (2201) extending toward the lifting sleeve (18). 4), the upper end of the lifting sleeve (18) is fixedly connected to the crossbeam (24), the lower end of the sliding lifting tube (15) extends downwardly out of the lifting sleeve (18), the lower end of the sliding lifting tube (15) is connected to a trumpet-shaped filter cake bottom plate (25) buckled on the conical cap top (4) and the drum bottom plate (5), the outer edge bottom surface of the filter cake bottom plate (25) is close to the upper surface of the drum bottom plate (5), the outer edge of the filter cake bottom plate (25) is connected to a filter bag lower positioning ring (26), the outer diameter of the filter bag lower positioning ring (26) is smaller than the inner diameter of the rotating basket (6), the filter bag lower positioning ring (26) is provided with a filter bag lower positioning groove (27), a filter bag (28) is provided in the rotating basket (6), the upper end of the filter bag (28) is clamped in the filter bag upper positioning groove (10) of the filter bag upper positioning ring (9) ), the lower end of the filter bag (28) is clamped in the filter bag lower positioning groove (27) of the filter bag lower positioning ring (26), a plurality of support columns (29) are evenly distributed circumferentially on the filter cake bottom plate (25), and the upper ends of the plurality of support columns (29) are connected to an annular liquid blocking plate (30), the outer diameter of the liquid blocking plate (30) is larger than the inner diameter of the filter bag upper positioning ring (9), the height of the support columns (29) is such that when the sliding lifting tube (15) is lowered to the lowest position, the lower surface of the liquid blocking plate (30) is just in contact with the upper surface of the filter bag upper positioning ring (9), the height of the lifting sleeve (18) below the top cover (21) is such that during the unloading process, the lifting sleeve (18) is always located in the sliding positioning sleeve (22), and a discharge port (31) is provided on the outer shell (20).

2. The closed bag unloading centrifuge according to claim 1, characterized in that: The outer shell (20) is internally connected to an annular material guide plate (32) which is arranged obliquely. The lower edge of the material guide plate (32) is connected to the discharge port (31). The inner edge of the material guide plate (32) is sealed to the outer wall of the intermediate shell (11). The outer edge of the material guide plate (32) is sealed to the inner wall of the outer shell (20).

3. The closed bag unloading centrifuge according to claim 1, characterized in that: The discharge port (31) is connected to a discharge pipe (33) extending obliquely downward, and the outer end of the discharge pipe (33) is connected to a closable door (34).

4. The closed bag unloading centrifuge according to claim 1, characterized in that: The outer edge of the upper end of the positioning ring (9) on the filter bag is connected to a retaining ring (35), which is located above the annular cover plate (13). The outer diameter of the retaining ring (35) is between the inner diameter and the outer diameter of the annular cover plate (13).

5. The closed bag unloading centrifuge according to claim 1, characterized in that: The base (1) is provided with a liquid discharge port (36) in communication with the liquid storage chamber (12); the liquid discharge port (36) is connected to a liquid discharge pipe (37) in communication with the outside; and the liquid discharge pipe (37) is provided with a liquid discharge valve (38).

6. The closed bag unloading centrifuge according to claim 1, characterized in that: The annular cover plate (13) is a conical ring with a small upper opening and a large lower opening.

7. The closed bag unloading centrifuge according to claim 1, characterized in that: The upper end of the first guide groove (16) is also connected to a second guide groove (39) extending obliquely upward.

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