Large spiral screen centrifuge used in salt production

Abstract

The utility model discloses a large spiral screen centrifugal machine used in salt production, relates to the technical field of spiral screen centrifugal machines, and has the advantages that a conical screen basket and the outer side wall of a screen are cleaned and scoured, and the possibility that the solid-liquid separation efficiency is influenced due to screen blockage is reduced. A shell and a material bin are fixed to the machine base, a conical screen basket is fixed in the material bin, a spiral scraper which is located in the conical screen basket and matched with the conical screen basket is rotationally connected into the material bin, a screen which covers the conical screen basket and is used for solid-liquid separation is fixed to the conical screen basket, and a feeding pipe located in the middle of the spiral scraper is further fixed to the material bin. One end of the feeding pipe is communicated with the outside, and the other end of the feeding pipe penetrates through the material bin and extends into the spiral scraper.

Description

Technical Field

[0001] The utility model relates to the technical field of filter elements, in particular to a large-scale spiral screen centrifuge used in salt production. Background Art

[0002] The spiral screen centrifuge is a continuously working filtering centrifuge that can continuously complete all processes such as feeding, separation, washing, drying and unloading. It has the advantages of large output, low energy consumption, simple maintenance and long maintenance cycle. During operation, the solid particles in the screen are transferred from small diameter to large diameter through the inclination angle of the screen and the speed difference between the spiral scraper and the screen.

[0003] In the traditional salt production process, a pusher centrifuge is used for solid-liquid separation. However, when the existing spiral screen centrifuge is used for solid-liquid separation, the size of the screen is limited, so the solid phase is easy to clog the screen. When the screen is clogged, the solid-liquid separation efficiency of the pusher centrifuge will be reduced. Utility Model Content

[0004] In view of the above-mentioned technical deficiencies, the purpose of the utility model is to provide a large-scale spiral screen centrifuge for use in salt production, which has the advantages of cleaning and flushing the conical screen basket and the outer side wall of the screen, reducing screen clogging and affecting the solid-liquid separation efficiency.

[0005] In order to solve the above technical problems, the utility model adopts the following technical solutions:

[0006] The utility model provides a large-scale spiral screen centrifuge used in salt production, comprising a machine base, a shell and a material bin are fixed on the machine base, a conical screen basket is fixed in the material bin, a spiral scraper located in the conical screen basket and adapted to the conical screen basket is rotatably connected in the material bin, a screen covering the conical screen basket and used for solid-liquid separation is fixed on the conical screen basket, a feed pipe located in the middle of the spiral scraper is also fixed on the material bin, one end of the feed pipe is communicated with the outside, and the other end passes through the material bin and extends into the spiral scraper, a connecting groove is provided on the spiral scraper, an inner cavity of the feed pipe is communicated with the gap between the spiral scraper and the conical screen basket through the connecting groove, an external cleaning component located outside the conical screen basket and used for cleaning the conical screen basket is fixed on the material bin, and a driving component for driving the spiral scraper to rotate is provided on the shell.

[0007] By adopting the above technical solution, the inner cavity of the feed pipe is connected with the gap between the spiral scraper and the conical screen basket, and the salt suspension enters the gap between the conical screen basket, the filter screen and the spiral scraper through the feed pipe. The drive component provides power to drive the spiral scraper to rotate. The solid phase of the salt crystals moves from the small diameter of the conical screen basket to the large diameter along the blades of the spiral scraper through the speed difference between the spiral scraper and the conical screen basket. Under the action of centrifugation, the liquid phase of the salt suspension is separated through the screen, and the solid phase of the salt crystals is trapped in the conical screen basket, the filter screen and the spiral scraper. In the gap between the knives, the solid-liquid separation of the salt suspension is realized. At the same time, the solid phase of the salt crystals moves from the small diameter of the spiral scraper and the conical screen basket to the large diameter through the spiral scraper. Due to the increase in the rotating diameter, the centrifugal force is rapidly increased, and the solid phase changes from a high moisture content solid phase when it first enters to a low moisture content solid phase when it is discharged, thereby realizing automatic and continuous solid-liquid separation of the salt suspension. At the same time, by setting an external cleaning component, the conical screen basket and the outer wall of the screen are cleaned and flushed to reduce the possibility of screen clogging and affecting the solid-liquid separation efficiency.

[0008] Preferably, an upper cleaning trough is provided on the upper portion of the material bin, an upper bin door for closing the upper cleaning trough is hingedly connected to the material bin, the external cleaning assembly includes a plurality of cleaning pipes fixed on the upper bin door, the water inlet end of the cleaning pipe is located outside the material bin, a plurality of nozzles connected with the inner cavity of the cleaning pipe and used for flushing the conical screen basket are fixed on the side of the cleaning pipe facing the conical screen basket, and the material bin is also provided with an internal cleaning assembly which cooperates with the cleaning pipe and flushes the screen on the conical screen basket.

[0009] Through the above technical solution, water flows into the cleaning pipe and is sprayed out through the nozzle to flush the outer wall of the conical screen basket, thereby reducing the possibility of blockage on the outer wall of the conical screen basket, allowing the solid phase blocked on the conical screen basket to re-enter the gap between the conical screen basket and the spiral scraper, and the inner wall of the screen on the conical screen basket is cleaned through the internal cleaning component, thereby increasing the service life of the conical screen basket.

[0010] Preferably, a lower cleaning trough is provided at the lower portion of the material bin, and a lower bin door for closing the lower cleaning trough is hingedly connected to the material bin, and the internal cleaning assembly includes a plurality of washing pipes fixed on the lower bin door, and the plurality of washing pipes are located between the feed pipe and the spiral scraper, and the water inlet end of the washing pipe extends out of the outer shell, and a plurality of connecting holes are provided on the spiral scraper, and the water outlet end of the washing pipe is located outside the connecting hole.

[0011] Through the above technical solution, water flows into the washing pipe and flows out through the water outlet end of the washing pipe. The water flows through the spiral scraper through the connecting hole and washes the screen on the conical screen basket, further cleaning the solid phase or dirt attached to the screen.

[0012] Preferably, the drive assembly includes a bearing seat fixed on the outer shell, and the bearing seat is fixed with a differential through a front bearing body and a rear bearing body, the front bearing body is fixed by a front bearing cover, and the rear bearing body is fixed by a rear bearing cover, and a main motor is also fixed on the outer shell, and a motor pulley is coaxially fixed to the output shaft end of the main motor, and a main pulley and a clutch are coaxially fixed to the input end of the differential, and the main pulley and the motor pulley outer sleeves are provided with belts adapted to the main pulley and the motor pulley, an output hollow shaft fixed to the material bin is fixed outside the output end of the differential, and an output shaft is rotatably connected inside the output hollow shaft, and the output end of the differential is coaxially fixed with the output shaft, the conical screen basket is fixed outside the output shaft core shaft, and the spiral scraper is fixed on the output shaft, and the center line of the conical screen basket, the center line of the spiral scraper, the output hollow shaft and the center line of the output shaft coincide.

[0013] Through the above technical solution, power is provided by the main motor, power is transmitted through the main pulley, belt and motor pulley, and the speed is adjusted by the differential. The rotation of the output hollow shaft and the output shaft will drive the conical screen basket and spiral scraper coaxially fixed with the output hollow shaft and the output shaft to rotate.

[0014] Preferably, the outer wall of the large diameter end of the conical screen basket is fixed to the material bin through a front closing plate, and the gap between the output hollow shaft and the conical screen basket and the gap between the conical screen basket and the front closing plate are filled with sealing rings that close the gap.

[0015] Through the above technical scheme, the output hollow shaft, the conical screen basket and the material bin are fixedly connected through the front closing plate and the conical screen basket, and the gaps between the output hollow shaft and the rear closing plate, and between the conical screen basket and the front closing plate are closed by the sealing ring, so that the gap between the material bin and the conical screen basket is a closed area, thereby further improving the solid-liquid separation efficiency.

[0016] Preferably, an annular material discharge chute is fixed in the material bin, and the annular material discharge chute is located outside the large diameter of the conical screen basket.

[0017] Through the above technical solution, the solid phase of the salt crystals moves from the small diameter of the conical screen basket to the large diameter along the blades of the spiral scraper through the speed difference between the spiral scraper and the conical screen basket, until it enters the annular discharge chute to form unloading.

[0018] Preferably, a liquid phase outlet and a solid phase outlet are provided at the lower portion of the material bin, the liquid phase outlet is not connected to the solid phase outlet, and the annular feed chute is located inside the solid phase outlet.

[0019] Through the above technical solution, the liquid phase passes through the through holes of the conical screen basket and the screen gaps of the screen, and is discharged from the liquid phase outlet of the material bin. The solid phase of the salt-making crystals moves from the small diameter of the conical screen basket to the large diameter along the blades of the spiral scraper through the speed difference between the spiral scraper and the conical screen basket, until it enters the annular discharge chute, forms unloading, and is discharged from the solid phase outlet of the material bin.

[0020] The beneficial effects of the utility model are as follows: the inner cavity of the feed pipe is connected with the gap between the spiral scraper and the conical screen basket, the salt suspension enters the gap between the conical screen basket, the filter screen and the spiral scraper through the feed pipe, the driving component provides power to drive the spiral scraper to rotate, and the solid phase of the salt crystal moves from the small diameter of the conical screen basket to the large diameter along with the blades of the spiral scraper through the speed difference between the spiral scraper and the conical screen basket. Under the centrifugal effect, the liquid phase of the salt suspension is separated out through the screen, and the solid phase of the salt crystal is trapped in the conical screen basket, the filter screen and the spiral scraper. In the gap between the scrapers, the solid-liquid separation of the salt suspension is achieved. At the same time, the solid phase of the salt crystals moves from the small diameter of the spiral scraper and the conical screen basket to the large diameter through the spiral scraper. Due to the increase in the rotation diameter, the centrifugal force is rapidly increased, and the solid phase changes from a high moisture content solid phase when it first enters to a low moisture content solid phase when it is discharged, thereby achieving automatic and continuous solid-liquid separation of the salt suspension. At the same time, by setting an external cleaning component, the conical screen basket and the outer wall of the screen are cleaned and flushed to reduce the possibility of screen clogging and affecting the solid-liquid separation efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0022] Figure 1 It is a structural schematic diagram of this embodiment;

[0023] Figure 2 For this embodiment Figure 1 The enlarged structural diagram at A in the middle;

[0024] Figure 3 Schematic diagram of the structure of the gland in this embodiment.

[0025] Description of reference numerals:

[0026] In the figure: 1. base; 2. shell; 3. material bin; 4. conical screen basket; 5. spiral scraper; 6. screen; 7. feed pipe; 8. cleaning pipe; 9. nozzle; 10. washing pipe; 11. connecting hole; 12. bearing seat; 13. front bearing body; 14. rear bearing body; 15. differential; 16. front bearing pressure cover; 17. rear bearing pressure cover; 18. main motor; 19. motor pulley; 20. main pulley; 21. clutch; 22. belt; 23. output hollow shaft; 24. output shaft; 25. pressure cover; 26. sealing protection cover; 27. sealing ring; 28. annular discharge chute; 29. ​​shock pad; 30. through hole; 31. connecting groove; 32. oil pump motor; 33. upper door; 34. front closing plate; 35. liquid phase outlet; 36 solid phase outlet. DETAILED DESCRIPTION

[0027] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0028] A large spiral screen centrifuge used in salt production, such as Figure 1-3 , including a machine base 1, a shell 2 and a material bin 3 are fixed on the machine base 1, a conical screen basket 4 is fixed in the material bin 3, a spiral scraper 5 located in the conical screen basket 4 and adapted to the conical screen basket 4 is rotatably connected in the material bin 3, a plurality of through holes 30 for discharging salt suspension are opened on the conical screen basket 4, a screen 6 covering the conical screen basket 4 and used for solid-liquid separation is fixed on the conical screen basket 4, the screen 6 covers the through holes 30 to prevent the solid phase of the salt suspension from being discharged from the through holes 30, and a spiral scraper 5 located in the conical screen basket 4 and adapted to the conical screen basket 4 is rotatably connected in the material bin 3, a plurality of through holes 30 for discharging salt suspension are opened on the conical screen basket 4, a screen 6 covering the conical screen basket 4 and used for solid-liquid separation is fixed on the conical screen basket 4, and the screen 6 covers the through holes 30 to prevent the solid phase of the salt suspension from being discharged from the through holes 30, and a spiral scraper 5 located in the conical screen basket 4 is rotatably connected in the material bin 3, and a plurality of through holes 30 for discharging salt suspension are arranged on the conical screen basket 4 ... A feed pipe 7 is located in the middle of the scraper 5, one end of which is connected to the outside, and the other end of which passes through the material bin 3 and extends into the spiral scraper 5. A gap is left between the spiral scraper 5 and the conical screen basket 4. A connecting groove 31 is provided on the spiral scraper 5. The inner cavity of the feed pipe 7 is connected to the gap between the spiral scraper 5 and the conical screen basket 4 through the connecting groove 31. An external cleaning component is fixed on the material bin 3, which is located outside the conical screen basket 4 and cleans the conical screen basket 4. A driving component for driving the spiral scraper 5 to rotate is provided on the outer casing 2.

[0029] like Figure 1 and Figure 2 and Figure 3The inner cavity of the feed pipe 7 is connected with the gap between the spiral scraper 5 and the conical screen basket 4. The salt suspension enters the conical screen basket 4, the filter screen and the spiral scraper 5 through the feed pipe 7. The drive assembly provides power to drive the spiral scraper 5 to rotate. The solid phase of the salt crystal moves from the small diameter of the conical screen basket 4 to the large diameter along with the blades of the spiral scraper 5 through the speed difference between the spiral scraper 5 and the conical screen basket 4. Under the centrifugal effect, the liquid phase of the salt suspension is separated through the screen 6, and the solid phase of the salt crystal is trapped in the conical screen basket 4, the filter screen and the spiral scraper 5. In the gap between the two, the solid-liquid separation of the salt suspension is realized. At the same time, the solid phase of the salt crystals moves from the small diameter of the spiral scraper 5 and the conical screen basket 4 to the large diameter through the spiral scraper 5. Due to the increase in the rotation diameter, the centrifugal force is rapidly increased, and the solid phase changes from a high moisture content solid phase when it first enters to a low moisture content solid phase when it is discharged, thereby realizing automatic and continuous solid-liquid separation of the salt suspension. At the same time, by setting an external cleaning component, the outer wall of the conical screen basket 4 and the screen 6 are cleaned and flushed to reduce the possibility of clogging of the screen 6 and affecting the solid-liquid separation efficiency.

[0030] like Figure 1 and Figure 2 and Figure 3 An upper cleaning trough is provided on the upper part of the material bin 3, and an upper bin door 33 for closing the upper cleaning trough is hingedly connected to the material bin 3. The external cleaning component includes a plurality of cleaning pipes 8 fixed on the upper bin door 33, and the water inlet end of the cleaning pipe 8 is located outside the material bin 3. A plurality of nozzles 9 connected with the inner cavity of the cleaning pipe 8 and used for flushing the conical screen basket 4 are fixed on the side of the cleaning pipe 8 facing the conical screen basket 4. The material bin 3 is also provided with an internal cleaning component that cooperates with the cleaning pipe 8 and flushes the screen 6 on the conical screen basket 4.

[0031] like Figure 1 and Figure 3 , water flows into the cleaning pipe 8 and is sprayed out through the nozzle 9, flushing the outer wall of the conical screen basket 4, reducing the possibility of blockage on the outer wall of the conical screen basket 4, allowing the solid phase blocked on the conical screen basket 4 to re-enter the gap between the conical screen basket 4 and the spiral scraper 5, and the inner wall of the screen 6 on the conical screen basket 4 is cleaned through the internal cleaning component, thereby increasing the service life of the conical screen basket 4.

[0032] like Figure 1 and Figure 3 A lower cleaning tank is provided at the lower part of the material bin 3, and a lower bin door for closing the lower cleaning tank is hingedly connected to the material bin 3. The internal cleaning assembly includes a plurality of washing pipes 10 fixed on the lower bin door. The plurality of washing pipes 10 are located between the feed pipe 7 and the spiral scraper 5. The water inlet end of the washing pipe 10 extends out of the outer shell 2. The spiral scraper 5 is provided with a plurality of connecting holes 11, and the water outlet end of the washing pipe 10 is located outside the connecting hole 11.

[0033] like Figure 1 and Figure 3The water flows into the washing pipe 10 and flows out through the water outlet end of the washing pipe 10 . The water flows through the spiral scraper 5 through the connecting hole 11 and washes the screen 6 on the conical screen basket 4 , and further cleans the solid phase or dirt attached to the screen 6 .

[0034] like Figure 1 The upper door 33 and the lower door are fixed to the material bin 3 by sealing buckles. The sealing buckles are existing structures, so they will not be described in detail here. The upper door 33 and the lower door are fixed with rubber sealing strips that close the gaps between the upper cleaning tank and the upper door 33, and the lower cleaning tank and the lower door to reduce the possibility of liquid overflow.

[0035] like Figure 1 A cleaning water tank and a water pump are provided outside the device. The water inlet of the water pump is connected to the water outlet of the cleaning water tank through a pipeline, and the water outlet of the water pump is connected to the water inlets of the washing pipe 10 and the washing pipe 8 through a pipeline. The water pump provides power to make the water flow in the cleaning water tank enter the washing pipe 10 and the washing pipe 8 to rinse the conical screen basket 4 and the screen 6 on the conical screen basket 4.

[0036] like Figure 1 The drive assembly includes a bearing seat 12 fixed on the housing 2, and the bearing seat 12 is fixed with a differential 15 through a front bearing body 13 and a rear bearing body 14. The front bearing body 13 is fixed by a front bearing pressure cover 16, and the rear bearing body 14 is fixed by a rear bearing pressure cover 17. A main motor 18 is also fixed on the housing 2, and a motor pulley 19 is coaxially fixed to the output shaft 24 end of the main motor 18. A main pulley 20 and a clutch 21 are coaxially fixed to the input end of the differential 15. The main pulley 20 and the motor pulley 19 are externally fixed. A belt 22 adapted to the main pulley 20 and the motor pulley 19 is provided, an output hollow shaft 23 fixed to the material bin 3 is fixed outside the output end of the differential 15, an output shaft 24 is rotatably connected inside the output hollow shaft 23, the output end of the differential 15 is coaxially fixed with the output shaft 24, the conical screen basket 4 is fixed outside the central shaft of the output shaft 24, the spiral scraper 5 is fixed on the output shaft 24, and the center line of the conical screen basket 4, the center line of the spiral scraper 5, the output hollow shaft 23 and the center line of the output shaft 24 coincide.

[0037] like Figure 1 and Figure 3 The spiral scraper 5 is fixed to the output shaft 24 through a pressure cover 25, a sealing protection cover 26 is fixed outside the pressure cover 25, and accessories such as an oil pump motor 32 are fixed on the machine base 1.

[0038] like Figure 1The power is provided by the main motor 18, and the power is transmitted through the main pulley 20, the belt 22 and the motor pulley 19. The speed is adjusted by the differential 15. The rotation of the output hollow shaft 23 and the output shaft 24 will drive the conical screen basket 4 and the spiral scraper 5 coaxially fixed with the output hollow shaft 23 and the output shaft 24 to rotate.

[0039] like Figure 1 and Figure 2 and Figure 3 The outer wall of the large diameter end of the conical screen basket 4 is fixed to the material bin 3 through the front closing plate 34, and the gap between the output hollow shaft 23 and the conical screen basket 4 and the gap between the conical screen basket 4 and the front closing plate 34 are filled with sealing rings 27 that close the gap.

[0040] like Figure 1 and Figure 2 and Figure 3 The output hollow shaft 23, the conical screen basket 4 and the material bin 3 are fixedly connected through the front closing plate 34 and the conical screen basket 4, and the gaps between the output hollow shaft 23 and the rear closing plate, and between the conical screen basket 4 and the front closing plate 34 are closed by the sealing ring 27, so that the gap between the material bin 3 and the conical screen basket 4 is a closed area, which further improves the solid-liquid separation efficiency.

[0041] like Figure 1 An annular discharge chute 28 is fixed in the material bin 3, and the annular discharge chute 28 is located outside the large diameter of the conical screen basket 4. The solid phase of the salt crystal passes through the speed difference between the spiral scraper 5 and the conical screen basket 4, and moves from the small diameter to the large diameter of the conical screen basket 4 along the blades of the spiral scraper 5 until entering the annular discharge chute 28 to form discharge.

[0042] like Figure 1 A liquid phase outlet 35 and a solid phase outlet 36 are provided at the lower part of the material bin 3. The liquid phase outlet 35 is not connected with the solid phase outlet 36. The annular discharge chute 28 is located in the solid phase outlet 36. The liquid phase passes through the through hole 30 of the conical screen basket 4 and the screen gap of the screen 6, and is discharged from the liquid phase outlet 35 of the material bin 3. The solid phase of the salt-making crystals moves from the small diameter of the conical screen basket 4 to the large diameter along the blades of the spiral scraper 5 through the speed difference between the spiral scraper 5 and the conical screen basket 4, until it enters the annular discharge chute 28, forms unloading, and is discharged from the solid phase outlet 36 of the material bin 3.

[0043] like Figure 1 The main body of the spiral scraper 5 is made of 2205 material, and the upper part of the spiral scraper 5 blade is welded with wear-resistant material to enhance the corrosion resistance and wear resistance of the spiral scraper 5, greatly extending the maintenance cycle of the spiral scraper 5 and the whole machine.

[0044] like Figure 1A plurality of shock-absorbing pads 29 are fixed to the side of the base 1 facing away from the housing 2. The plurality of shock-absorbing pads 29 are evenly arranged on the base 1. The shock-absorbing pads 29 play a shock-absorbing role and improve the stability of the device during operation.

[0045] When in use, the salt suspension enters the spiral scraper 5 through the feed pipe 7, and then passes through the connecting groove 31 on the spiral scraper 5 into the gap between the spiral scraper 5 and the conical screen basket 4. The liquid phase passes through the through hole 30 of the conical screen basket 4 and the screen slit of the screen 6 and is discharged from the liquid phase outlet 35 of the material bin 3. The solid phase of the salt crystal moves from the small diameter of the conical screen basket 4 to the large diameter along with the blades of the spiral scraper 5 through the speed difference between the spiral scraper 5 and the conical screen basket 4, until it enters the annular discharge chute 28, forms unloading, and is discharged from the solid phase outlet 36 of the material bin 3, thereby realizing solid-liquid separation.

[0046] After the work is completed, turn on the water pump, which provides power so that the water in the cleaning water tank flows into the washing pipe 10 and the cleaning pipe 8, and is sprayed out through the nozzle 9 to flush the conical screen basket 4 and the screen 6 on the conical screen basket 4, thereby reducing the possibility of clogging of the conical screen basket 4 and increasing the service life of the conical screen basket 4.

[0047] Obviously, those skilled in the art can make various changes and modifications to the present invention without departing from the spirit and scope of the present invention. Thus, if these modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalents, the present invention is also intended to include these modifications and variations.

Claims

1. A large spiral screen centrifuge used in salt production, characterized in that: The invention comprises a machine base (1), a housing (2) and a material bin (3) being fixed on the machine base (1), a conical screen basket (4) being fixed in the material bin (3), a spiral scraper (5) being rotatably connected to the material bin (3) and being located in and adapted to the conical screen basket (4), a screen (6) covering the conical screen basket (4) and used for solid-liquid separation being fixed on the conical screen basket (4), a feed pipe (7) being located in the middle of the spiral scraper (5) being fixed on the material bin (3), and the feed pipe (7) being connected to the material bin (3) and being adapted to the conical screen basket (4). One end of the feed pipe (7) is in communication with the outside, and the other end passes through the material bin (3) and extends into the spiral scraper (5). The spiral scraper (5) is provided with a connecting groove (31). The inner cavity of the feed pipe (7) is in communication with the gap between the spiral scraper (5) and the conical screen basket (4) through the connecting groove (31). An external cleaning component is fixed to the material bin (3) and is located outside the conical screen basket (4) and is used to clean the conical screen basket (4). A driving component for driving the spiral scraper (5) to rotate is provided on the outer shell (2).

2. A large spiral screen centrifuge for use in salt production as claimed in claim 1, characterized in that: An upper cleaning trough is provided on the upper part of the material bin (3); an upper bin door (33) for closing the upper cleaning trough is hingedly connected to the material bin (3); the external cleaning assembly comprises a plurality of cleaning pipes (8) fixed to the upper bin door (33); the water inlet end of the cleaning pipe (8) is located outside the material bin (3); a plurality of nozzles (9) are fixed on the side of the cleaning pipe (8) facing the conical screen basket (4) and are connected to the inner cavity of the cleaning pipe (8) and are used to flush the conical screen basket (4); and an internal cleaning assembly is also provided on the material bin (3) and is matched with the cleaning pipe (8) and is used to flush the screen (6) on the conical screen basket (4).

3. A large spiral screen centrifuge for use in salt production as claimed in claim 2, characterized in that: A lower cleaning trough is provided at the lower part of the material bin (3); a lower bin door for closing the lower cleaning trough is hingedly connected to the material bin (3); the internal cleaning assembly comprises a plurality of washing pipes (10) fixed to the lower bin door; the plurality of washing pipes (10) are located between the feed pipe (7) and the spiral scraper (5); the water inlet ends of the washing pipes (10) extend out of the housing (2); the spiral scraper (5) is provided with a plurality of connection holes (11); the water outlet ends of the washing pipes (10) are located outside the connection holes (11).

4. A large-scale spiral screen centrifuge for use in salt production as claimed in claim 1, characterized in that: The drive assembly comprises a bearing seat (12) fixed on the housing (2); the bearing seat (12) is fixed with a differential (15) via a front bearing body (13) and a rear bearing body (14); the front bearing body (13) is fixed by a front bearing cover (16); the rear bearing body (14) is fixed by a rear bearing cover (17); a main motor (18) is also fixed on the housing (2); a motor pulley (19) is coaxially fixed to an output shaft (24) end of the main motor (18); a main pulley (20) and a clutch (21) are coaxially fixed to an input end of the differential (15); the main pulley (20) and the motor pulley ( 19) The outer sleeve is provided with a belt (22) adapted to the main pulley (20) and the motor pulley (19); an output hollow shaft (23) fixed to the material bin (3) is fixed outside the output end of the differential (15); an output shaft (24) is rotatably connected inside the output hollow shaft (23); the output end of the differential (15) is coaxially fixed to the output shaft (24); the conical screen basket (4) is fixed outside the central shaft of the output shaft (24); the spiral scraper (5) is fixed on the output shaft (24); the center line of the conical screen basket (4), the center line of the spiral scraper (5), the output hollow shaft (23) and the center line of the output shaft (24) coincide.

5. A large spiral screen centrifuge for use in salt production as claimed in claim 4, characterized in that: The outer wall of the large diameter end of the conical screen basket (4) is fixed to the material bin (3) via a front closing plate (34), and a sealing ring (27) for closing the gap is filled in the gap between the output hollow shaft (23) and the conical screen basket (4), and in the gap between the conical screen basket (4) and the front closing plate (34).

6. A large-scale spiral screen centrifuge for use in salt production as claimed in claim 1, characterized in that: An annular material discharge trough (28) is fixed in the material bin (3), and the annular material discharge trough (28) is located outside the large diameter of the conical screen basket (4).

7. A large-scale spiral screen centrifuge for use in salt production as claimed in claim 6, characterized in that: The lower portion of the material bin (3) is provided with a liquid phase outlet (35) and a solid phase outlet (36); the liquid phase outlet (35) is not connected to the solid phase outlet (36); and the annular material discharge trough (28) is located inside the solid phase outlet (36).

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