Kitchen waste solid-liquid separation system and separation method

Abstract

The invention discloses a kitchen waste solid-liquid separation system and a separation method, which are designed aiming at the problems of low separation efficiency, easiness in blockage and the like in the prior art. The system is sequentially provided with a double-shaft crushing device, a secondary crushing device, a primary filter pressing device and a centrifugal separation device in the material flow direction. The double-shaft and second-stage crushing device crushes the garbage in a multi-stage manner, the particle size is reduced, and blockage is prevented; the preliminary filter pressing device realizes step-by-step filter pressing through gradually decreasing a gap between an inclined pressing plate and a chain plate, the centrifugal separation device strengthens solid-liquid separation by utilizing rotation of a filter drum, and the efficiency and the purity are improved through multi-stage cooperation. And each device adopts an optimized structure, such as the matching of a baffle shell of the secondary crushing device and the design of a flushing head of the primary filter pressing device, so that the stable operation is ensured. According to the separation method, efficient solid-liquid separation of the kitchen waste is achieved through the steps of crushing, filter pressing, centrifuging and the like, the follow-up treatment difficulty is lowered, effective support is provided for resource utilization and harmless treatment, and remarkable practicability and environmental protection value are achieved.

Description

Technical Field

[0001] The present invention relates to the technical field of solid-liquid separation of kitchen waste, and in particular to a solid-liquid separation system and method for kitchen waste. Background Art

[0002] With the acceleration of urbanization and the improvement of people's living standards, the amount of food waste generated is increasing. Food waste has a complex composition, characterized by high water content and rich organic matter. If not properly treated, direct landfilling will occupy a large amount of land resources and the resulting leachate will pollute the soil and groundwater. Incineration, due to its high water content, has low combustion efficiency and may also produce harmful substances such as dioxins. Therefore, effective solid-liquid separation of food waste is crucial for its resource utilization and harmless treatment.

[0003] There are many problems with existing solid-liquid separation technologies for food waste. For example, the traditional mechanical pressing separation method has low separation efficiency, making it difficult to fully separate solids and liquids, and easily causing excessive liquid to remain in the solid residue, reducing the effect of subsequent resource utilization. At the same time, it causes large wear and tear on the equipment and high maintenance costs. Although centrifugal separation technology has improved separation efficiency to a certain extent, it has high energy consumption and large equipment investment. Moreover, since food waste contains a lot of fiber, grease and other substances, it is easy to clog the pipes and filters of the centrifugal equipment, affecting the normal operation of the equipment. In addition, some solid-liquid separation equipment lacks adaptability to food waste of different properties and is difficult to meet diverse processing needs. Summary of the Invention

[0004] The technical problem to be solved by the present invention is that the separation efficiency is low and the pipes and filters are easily blocked.

[0005] In order to solve the above technical problems, the technical solution adopted by the present invention is: a solid-liquid separation system for food waste, comprising a double-shaft crushing device, a secondary crushing device, a primary filter press device and a centrifugal separation device arranged in sequence along the material flow direction; Double-shaft crushing device, used for preliminary crushing of food waste; The secondary crushing device crushes the initially crushed food waste again by rotary cutting; The preliminary filter press device filters the crushed food waste by gradually compressing it with an inclined plate; The centrifugal separation device separates the solid and liquid of the food waste by rotating the filter cartridge.

[0006] Preferably, the secondary crushing device includes a horizontally rotating cylindrical crushing drum, the bottom end of the double-axis crushing device is connected to one end of the crushing drum through a preliminary discharge pipe, a spiral mounting chain is provided on the inner wall of the crushing drum, and a cutting block is fixedly provided on the inner side of the mounting chain, a slag discharge port is provided at the bottom of the other end of the crushing drum, and a secondary discharge pipe for collecting garbage is provided below the slag discharge port.

[0007] Preferably, the secondary crushing device also includes a base, and support seats are fixedly provided on the top of both ends of the base. The ends of the crushing drum are rotatably connected to the support seats. A driving gear is rotatably arranged on the base, and a gear ring is coaxially fixedly connected to the crushing drum. The driving gear is engaged with the gear ring, and a driving motor connected to the driving gear is provided on the inner side of the base.

[0008] Preferably, a baffle shell is fixedly installed on the top of the base, the baffle shell cover is arranged on the discharge end of the crushing drum, a gap is provided between the end wall of the baffle shell and the outer wall of the crushing drum, and the hopper structure at the top of the secondary discharge pipe is fixed to the inner bottom of the baffle shell.

[0009] Preferably, the preliminary filter pressing device includes a shell, connecting wheels horizontally arranged at both ends of the shell and a chain plate transmission-connected between the two connecting wheels, a driving member for driving the connecting wheels to rotate is installed outside the shell, an inclined pressure plate is provided on the top of the shell, the gap between the inclined pressure plate and the top of the chain plate decreases along the rotation direction of the chain plate, a preliminary liquid discharge pipe is connected to the center of the bottom of the shell, and a preliminary slag discharge pipe is connected to the shell below the discharge end of the chain plate.

[0010] Preferably, limit blocks are equidistantly arranged on the outer peripheral surface of the chain plate, the middle portion of the limit blocks is connected to the chain plate via a hinge, and the limit blocks are in a trapezoidal structure.

[0011] Preferably, a liquid collecting tank is provided at the lower shell of the chain plate, the preliminary drainage pipe is connected to the bottom of the liquid collecting tank, a flushing head is fixedly provided in the shell, the flushing head is located between the two connecting wheels, the flushing head is arranged vertically downward, and the flushing head is located directly below the liquid collecting tank.

[0012] Preferably, the centrifugal separation device includes a filter cartridge arranged horizontally and rotated inside, and openings are provided at both ends of the filter cartridge. A drive assembly of the filter cartridge is provided at the end of the centrifugal separation device, and a liquid collecting plate is arranged obliquely at the bottom of the centrifugal separation device, and the bottom end of the liquid collecting plate is connected to a secondary liquid drainage trough. A connecting sleeve is fixedly provided at one end of the centrifugal separation device away from the driving assembly, and the bottom end of the connecting sleeve is fixedly connected to a secondary slag discharge pipe.

[0013] Preferably, one end of the filter cartridge away from the drive assembly is located in the connecting sleeve, and both ends of the internal mounting shaft of the filter cartridge are rotatably connected to the connecting sleeve and the inner side wall of the centrifugal separation device respectively.

[0014] The separation method of the solid-liquid separation system of food waste comprises the following steps: Step 1: Pour the food waste into the double-shaft crushing device, where the crushing rollers crush the food waste, and then transfer the crushed food waste to the secondary crushing device; Step 2: The crushing drum in the secondary crushing device rotates, and the cutters inside the crushing drum crush the food waste inside during the rotation process, performing secondary crushing on the food waste, cutting the food waste into strips, and then conveying the cut food waste to the primary filter press device; Step 3: The food waste is moved by the filter plates inside the primary filter press. As the food waste and the filter plates move, the food waste contacts the inclined pressure plate. As the gap between the filter plates and the inclined pressure plate decreases, the food waste is continuously filtered. The filtrate produced by the filtration is discharged through the primary drain pipe, and the solid waste is transported to the centrifugal separation device. Step 4: The solid waste enters the filter cartridge in the centrifugal separation device. The filter cartridge in the centrifugal separation device rotates to centrifuge the solid waste. The separated liquid is discharged through the secondary drainage trough, and the remaining solid waste is discharged through the secondary slag discharge pipe, completing the solid-liquid separation processing of the kitchen waste.

[0015] The present invention provides a solid-liquid separation system and a separation method for kitchen waste, which have the following beneficial effects.

[0016] 1. The double-shaft crushing device performs preliminary extrusion and crushing on the food waste. The spiral cutters in the crushing drum of the secondary crushing device perform secondary crushing by rotary cutting, which fully cuts and refines the strip-shaped and block-shaped waste, effectively reducing the particle size of the material, preventing large particles from entering the subsequent pipelines and filters, reducing the probability of blockage, and laying the foundation for subsequent solid-liquid separation.

[0017] 2. The system sequentially incorporates a primary filter press and a centrifugal separator to achieve multi-stage solid-liquid separation. The primary filter press gradually compresses the material for filtration through a design that gradually reduces the gap between the inclined pressure plate and the chain plate. The centrifugal separator further separates the solid and liquid by utilizing the centrifugal force generated by the high-speed rotation of the filter cartridge. The synergistic effect of the two significantly improves the efficiency and purity of solid-liquid separation of food waste compared to a single separation method, shortening processing time and increasing the processing volume per unit time. 3. In the secondary crushing device, the clearance between the retaining shell and the crushing drum, the drive gear and the gear ring transmission and other structural designs ensure that the crushing process is stable and reliable; the chain plate limit block, flushing head and liquid collection tank design of the primary filter press prevent material deviation on the one hand, and on the other hand, clean the residual impurities in the filter screen in time to avoid filter blockage, ensuring the filtration effect and continuous operation of the system; the inclined liquid collection plate, connecting sleeve and other structures of the centrifugal separation device enable the liquid and solid to be discharged smoothly after separation, reducing residue and improving the stability of equipment operation. BRIEF DESCRIPTION OF THE DRAWINGS The present invention will be further described below with reference to the accompanying drawings and embodiments: Figure 1 Schematic diagram of the structure of an embodiment of the present invention.

[0018] Figure 2 Schematic diagram of the internal structure of the secondary crushing device in an embodiment of the present invention.

[0019] Figure 3 Schematic diagram of the internal structure of the preliminary filter press device in an embodiment of the present invention.

[0020] Figure 4 Schematic diagram of the internal structure of the centrifugal separation device in an embodiment of the present invention.

[0021] In the figure: 1. Double-shaft crushing device; 2. Secondary crushing device; 3. Primary filter press device; 4. Centrifugal separation device.

[0022] 11. Preliminary discharge pipe; 21. Base; 22. Crushing drum; 23. Drive gear; 24. Ring gear; 25. Support seat; 26. Baffle shell; 27. Secondary discharge pipe; 28. Mounting chain; 281. Cutting block; 29. ​​Filter plate; 31. Preliminary liquid discharge pipe; 32. Preliminary slag discharge pipe; 33. Liquid collecting tank; 34. Connecting wheel; 35. Chain plate; 36. Limit block; 37. Inclined pressure plate; 38. Flushing head; 41. Secondary liquid discharge tank; 42. Secondary slag discharge pipe; 43. Liquid collecting plate; 44. Drive assembly; 45. Filter cartridge; 46. Connecting sleeve. DETAILED DESCRIPTION

[0023] like Figure 1-4 As shown, the present invention provides a solid-liquid separation system for kitchen waste, comprising a biaxial crushing device 1, a secondary crushing device 2, a primary filter press device 3 and a centrifugal separation device 4 arranged in sequence along the material flow direction; The double-shaft crushing device 1 is used to perform preliminary crushing of the food waste; Secondary crushing device 2, which crushes the initially crushed food waste again by rotary cutting; The preliminary filter press device 3 filters the crushed food waste by gradually compressing it with an inclined plate; The centrifugal separation device 4 separates the solid and liquid of the food waste by rotating the filter cartridge 45 centrifugally.

[0024] The food waste is crushed by the double-shaft crushing device 1, so that the food waste is flattened. The double-shaft crushing device 1 can perform preliminary cutting and squeezing on the food waste to achieve initial solid-liquid separation, so that some liquid is squeezed out. The compressed food waste is then cut and crushed again by the secondary crushing device 2. Continuous cutting can evenly cut the food waste. The cut food waste is then transported to the preliminary filter press 3. The preliminary filter press 3 drives the food waste to move. During the movement of the food waste, the food waste is continuously squeezed. The squeezed liquid falls and enters the preliminary drainage pipe 31 at the bottom of the filter press 3. The preliminary drainage pipe 31 discharges the liquid. The food waste that has been filtered is transported to the centrifugal separation device 4. The food waste enters the interior of the filter cartridge 45. The filter cartridge 45 drives the food waste to rotate synchronously during rotation, thereby performing centrifugal separation of the food waste.

[0025] like Figure 1 and Figure 2 As shown, the secondary crushing device 2 includes a horizontally rotating cylindrical crushing drum 22. The bottom end of the dual-shaft crushing device 1 is connected to one end of the crushing drum 22 via a preliminary discharge pipe 11. A spiral mounting chain 28 is provided on the inner sidewall of the crushing drum 22, and a cutting block 281 is fixedly mounted on the inner side of the mounting chain 28. A slag discharge port is provided at the bottom of the other end of the crushing drum 22, and a secondary discharge pipe 27 for collecting the waste is provided below the slag discharge port. The preliminarily crushed food waste is transported into the secondary crushing device 2 through the preliminary discharge pipe 11 and enters the crushing drum 22. As the crushing drum 22 rotates, the food waste moves along the spiral mounting chain 28. During this movement, the cutting blocks 281 on the mounting chain 28 cut the food waste, ensuring that the food waste is evenly cut. The cut food waste is then discharged from the slag discharge port at the end of the crushing drum 22.

[0026] like Figure 1 and Figure 2 As shown, the secondary crushing device 2 also includes a base 21, with support bases 25 fixedly mounted on both ends of the top portion of the base 21. The ends of the crushing drum 22 are rotatably connected to the support bases 25. A drive gear 23 is rotatably mounted on the base 21. A ring gear 24 is coaxially fixedly mounted on the crushing drum 22, meshing with the drive gear 23. A drive motor is disposed within the base 21, which is transmission-connected to the drive gear 23. The drive motor and the mounting shaft of the drive gear 23 are transmission-connected via a pulley assembly. The drive motor drives the drive gear 23 to rotate, which in turn drives the meshing ring gear 24. The ring gear 24 drives the crushing drum 22 to rotate horizontally, with the support bases 25 providing stable support for the crushing drum 22.

[0027] like Figure 1 and Figure 2 As shown, in order to prevent the material falling from the discharge end of the crushing drum 22 from spilling randomly, a baffle shell 26 is fixedly installed on the top of the base 21. The baffle shell 26 covers the discharge end of the crushing drum 22. A gap is provided between the end wall of the baffle shell 26 and the outer wall of the crushing drum 22. The hopper structure at the top of the secondary discharge pipe 27 is fixed to the inner bottom of the baffle shell 26. The baffle shell 26 covers the discharge end of the crushing drum 22, so that the material falling from the discharge end of the crushing drum 22 is inside the baffle shell 26. The material smoothly falls into the hopper structure and then enters the secondary discharge pipe 27. It is discharged into the preliminary filter press device 3 through the secondary discharge pipe 27. The secondary discharge pipe 27 is tilted to ensure the smooth flow of materials.

[0028] like Figure 1 and Figure 3 The preliminary filter press device 3 comprises a housing, connecting wheels 34 arranged horizontally and rotatably at both ends of the housing, and a chain plate 35 connected between the two connecting wheels 34. A driving member for driving the connecting wheels 34 is mounted outside the housing. A diagonal pressure plate 37 is provided on the top of the housing. The gap between the diagonal pressure plate 37 and the top of the chain plate 35 decreases along the rotation direction of the chain plate 35. A preliminary liquid discharge pipe 31 is connected to the center of the bottom of the housing. A preliminary slag discharge pipe 32 is connected to the housing below the discharge end of the chain plate 35. The food waste flowing out of the secondary discharge pipe 27 enters the preliminary filter press device 3, and is received by the chain plate 35. The connecting wheel 34 is driven to rotate by the driving member, thereby rotating the chain plate 35. The chain plate 35 drives the food waste to move during the rotation, and the food waste moves along the inclined pressure plate 37. As the food waste follows the movement, the distance between the inclined pressure plate 37 and the chain plate 35 is continuously reduced. The food waste is continuously compressed during the movement, and the filtrate generated by the compression flows down from the gap of the chain plate 35. The filtrate enters the preliminary drainage pipe 31 and is discharged outside through the preliminary drainage pipe 31; the remaining solid food waste falls from the discharge end of the chain plate 35 as the chain plate 35 continues to rotate, and the food waste is discharged through the preliminary slag discharge pipe 32 and enters the centrifugal separation device 4.

[0029] like Figure 3 As shown, limit blocks 36 are equidistantly arranged on the outer circumference of the chain plate 35. The middle portion of the limit blocks 36 is hinged to the chain plate 35, forming a trapezoidal structure. By hingedly connecting the limit blocks 36 to the chain plate 35, the limit blocks 36 limit the position of the food waste, preventing it from moving backward during compression and ensuring the quality of the filter press.

[0030] like Figure 1 and Figure 3As shown. A liquid collecting tank 33 is provided at the lower shell of the chain plate 35, and the preliminary liquid drain pipe 31 is connected to the bottom of the liquid collecting tank 33. A flushing head 38 is fixedly provided in the shell. The flushing head 38 is located between the two connecting wheels 34. The flushing head 38 is arranged vertically downward and is located directly below the liquid collecting tank 33. During the process of filter pressing using the chain plate 35, the gaps of the chain plate 35 are easily clogged. Therefore, when the chain plate 35 rotates to the bottom, the chain plate 35 is flushed by the flushing head 38. The flushing head 38 can be connected to a high-pressure air source to ensure the cleanliness of the chain plate 35. After the residual liquid produced by the filter pressing enters the liquid collecting tank 33, it can smoothly enter the preliminary liquid drain pipe 31 for discharge.

[0031] like Figure 1 and Figure 4 The centrifugal separator 4 includes a filter cartridge 45 that is horizontally rotatably arranged inside. Both ends of the filter cartridge 45 are provided with openings. A drive assembly 44 for the filter cartridge 45 is provided at the end of the centrifugal separator 4. A liquid collecting plate 43 is arranged obliquely at the bottom of the centrifugal separator 4. The bottom end of the liquid collecting plate 43 is connected to a secondary liquid drain trough 41. A connecting sleeve 46 is fixedly provided at one end of the centrifugal separator 4 away from the drive assembly 44. The bottom end of the connecting sleeve 46 is fixedly connected to a secondary slag discharge pipe 42. The solid food waste discharged from the preliminary slag discharge pipe 32 enters the interior of the filter cartridge 45, and the food waste enters the filter cartridge 45 through the opening at the end of the filter cartridge 45. The filter cartridge 45 is driven to rotate by the drive assembly 44. During the rotation of the filter cartridge 45, the food waste is centrifuged. The centrifuged liquid flows down along the inner wall of the centrifugal separation device 4, and enters the secondary drainage trough 41 under the guidance of the liquid collecting plate 43. It is discharged to the outside through the secondary drainage trough 41. The remaining food waste flows out from the end of the filter cartridge 45, enters the connecting sleeve 46, and is discharged to the outside from the secondary slag discharge pipe 42 at the bottom of the connecting sleeve 46.

[0032] like Figure 4 As shown. The end of the filter cartridge 45 away from the drive assembly 44 is located within the connecting sleeve 46. The ends of the mounting shaft within the filter cartridge 45 are rotatably connected to the connecting sleeve 46 and the inner wall of the centrifugal separator 4. The food waste discharge end of the filter cartridge 45 is located within the connecting sleeve 46, allowing the food waste to be smoothly discharged into the connecting sleeve 46. The installation of the connecting sleeve 46 and the centrifugal separator 4 on the filter cartridge 45 ensures the stability of the filter cartridge 45's operation.

[0033] A separation method for a solid-liquid separation system of kitchen waste, comprising the following steps: Step 1: Pour the food waste into the double-shaft crushing device 1. The crushing rollers in the double-shaft crushing device 1 squeeze and crush the food waste, and then transport the crushed food waste to the secondary crushing device 2. Step 2: The crushing drum 22 in the secondary crushing device 2 rotates, and the cutter blocks 281 inside the crushing drum 22 crush the food waste inside during the rotation process, performing secondary crushing on the food waste, cutting the food waste into strips, and then conveying the cut food waste to the primary filter press device 3; Step 3: The food waste is moved by the filter plate 29 inside the primary filter press device 3. As the food waste and the filter plate 29 move, the food waste comes into contact with the inclined pressure plate 37. As the gap between the filter plate 29 and the inclined pressure plate 37 decreases, the food waste is continuously filtered. The filtrate produced by the filtration is discharged through the primary drain pipe 31, and the solid waste is transported to the centrifugal separation device 4. Step 4: The solid waste enters the filter cartridge 45 in the centrifugal separation device 4. The filter cartridge 45 in the centrifugal separation device 4 rotates to centrifuge the solid waste. The separated liquid is discharged through the secondary drainage trough 41, and the remaining solid waste is discharged through the secondary slag discharge pipe 42, completing the solid-liquid separation processing of the kitchen waste.

Claims

1. The solid-liquid separation system for kitchen waste is characterized by: It comprises a double-shaft crushing device (1), a secondary crushing device (2), a primary filter press device (3) and a centrifugal separation device (4) which are sequentially arranged along the material flow direction; A double-shaft crushing device (1) is used for preliminary crushing of food waste; The secondary crushing device (2) crushes the initially crushed food waste again by means of rotary cutting; A preliminary filter press device (3) filters the crushed food waste by gradually compressing it with an inclined plate; The centrifugal separation device (4) separates the solid and liquid of the food waste by rotating the filter cartridge (45) in a centrifugal manner.

2. The solid-liquid separation system for kitchen waste according to claim 1, characterized in that: The secondary crushing device (2) includes a cylindrical crushing drum (22) arranged to rotate horizontally. The bottom end of the double-shaft crushing device (1) is connected to one end of the crushing drum (22) through a preliminary discharge pipe (11). A spiral mounting chain (28) is provided on the inner side wall of the crushing drum (22). A cutting block (281) is fixedly provided on the inner side surface of the mounting chain (28). A slag discharge port is provided at the bottom of the other end of the crushing drum (22). A secondary discharge pipe (27) for collecting garbage is provided below the slag discharge port.

3. The solid-liquid separation system for food waste according to claim 2, characterized in that: The secondary crushing device (2) further comprises a base (21), and support seats (25) are fixedly provided at the tops of both ends of the base (21), and the ends of the crushing drum (22) are rotatably connected to the support seats (25). A driving gear (23) is rotatably arranged on the base (21), and a ring gear (24) is coaxially fixedly connected to the crushing drum (22), and the driving gear (23) is meshed with the ring gear (24). A driving motor is provided on the inner side of the base (21) and is transmission-connected to the driving gear (23).

4. The solid-liquid separation system for food waste according to claim 3, characterized in that: A retaining shell (26) is fixedly mounted on the top of the base (21). The retaining shell (26) is covered on the discharge end of the crushing drum (22). A gap is provided between the end wall of the retaining shell (26) and the outer side wall of the crushing drum (22). The hopper structure at the top end of the secondary discharge pipe (27) is fixed to the inner bottom of the retaining shell (26).

5. The solid-liquid separation system for food waste according to claim 1, characterized in that: The preliminary filter press device (3) comprises a shell, connecting wheels (34) arranged horizontally and rotatably at both ends of the shell, and a chain plate (35) connected between the two connecting wheels (34). A driving member for driving the connecting wheels (34) to rotate is installed outside the shell. A slanted pressure plate (37) is provided on the top of the shell. The gap between the slanted pressure plate (37) and the top of the chain plate (35) decreases along the rotation direction of the chain plate (35). A preliminary liquid discharge pipe (31) is connected to the center of the bottom of the shell. A preliminary slag discharge pipe (32) is connected to the shell below the discharge end of the chain plate (35).

6. The solid-liquid separation system for food waste according to claim 5, characterized in that: Limiting blocks (36) are equidistantly arranged on the outer peripheral surface of the chain plate (35), and the middle portion of the limiting blocks (36) is connected to the chain plate (35) via a hinge, and the limiting blocks (36) are in a trapezoidal structure.

7. The solid-liquid separation system for kitchen waste according to claim 6, characterized in that: A liquid collecting trough (33) is provided at the lower shell of the chain plate (35), the preliminary liquid drain pipe (31) is connected to the bottom of the liquid collecting trough (33), a flushing head (38) is fixedly provided in the shell, the flushing head (38) is located between the two connecting wheels (34), the flushing head (38) is arranged vertically downward, and the flushing head (38) is located directly below the liquid collecting trough (33).

8. The solid-liquid separation system for food waste according to claim 1, characterized in that: The centrifugal separation device (4) comprises a filter cartridge (45) arranged horizontally and rotatably inside, with openings provided at both ends of the filter cartridge (45). A drive assembly (44) for the filter cartridge (45) is provided at the end of the centrifugal separation device (4). A liquid collecting plate (43) is arranged obliquely at the bottom of the centrifugal separation device (4), and the bottom end of the liquid collecting plate (43) is connected to a secondary liquid drain trough (41). A connecting sleeve (46) is fixedly provided at one end of the centrifugal separation device (4) away from the drive assembly (44), and the bottom end of the connecting sleeve (46) is fixedly connected to a secondary slag discharge pipe (42).

9. The solid-liquid separation system for kitchen waste according to claim 8, characterized in that: One end of the filter cartridge (45) away from the drive assembly (44) is located in the connecting sleeve (46), and both ends of the internal mounting shaft of the filter cartridge (45) are rotatably connected to the connecting sleeve (46) and the inner side wall of the centrifugal separation device (4).

10. The separation method of the solid-liquid separation system for food waste according to claim 1, characterized in that: The steps include: Step 1: pouring the food waste into the double-shaft crushing device (1), the crushing rollers in the double-shaft crushing device (1) squeeze and crush the food waste, and then conveying the crushed food waste to the secondary crushing device (2); Step 2: The crushing drum (22) in the secondary crushing device (2) rotates, and the cutter (281) inside the crushing drum (22) crushes the food waste inside during the rotation process, performing secondary crushing on the food waste, cutting the food waste into strips, and then transporting the cut food waste to the primary filter press device (3); Step 3: The food waste is moved by the filter plate (29) inside the preliminary filter press device (3). During the movement of the food waste and the filter plate (29), the food waste contacts the inclined pressure plate (37). As the gap between the filter plate (29) and the inclined pressure plate (37) is continuously reduced, the food waste is continuously filtered. The filtrate produced by the filtration is discharged through the preliminary drainage pipe (31), and the solid waste is transported to the centrifugal separation device (4). Step 4: The solid waste enters the filter cartridge (45) in the centrifugal separation device (4). The filter cartridge (45) in the centrifugal separation device (4) rotates to centrifuge the solid waste. The separated liquid is discharged through the secondary liquid discharge trough (41), and the remaining solid waste is discharged through the secondary slag discharge pipe (42), thereby completing the solid-liquid separation process of the kitchen waste.

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