Sewage treatment solid-liquid separation device

Abstract

The invention discloses a sewage treatment solid-liquid separation device, and relates to the technical field of sewage treatment.The sewage treatment solid-liquid separation device is characterized in that one end of a large spiral driving assembly is in transmission connection with a differential switching assembly, and the large spiral driving assembly is provided with a small spiral driving assembly; according to the invention, through the arrangement of the small screw and the large screw, the small screw is matched with the large screw for spacing adjustment, and the inner-layer sludge is extruded in the adjustment process, so that the solid-liquid separation effect of the inner layer of the sludge is improved, the difference between the separation efficiency of the inner-layer sludge and the separation efficiency of the outer-layer sludge is reduced, and the separation efficiency of the inner-layer sludge and the outer-layer sludge is improved. The interior of the rotating shaft is hollow and provided with small holes, preliminarily filtered filtrate can enter the rotating shaft through the small holes and flow into the liquid containing cavity of the machine base through the channel, and recovery of the filtrate is achieved.

Description

Technical Field

[0001] The present invention relates to the technical field of sewage treatment, in particular to a sewage treatment solid-liquid separation device. Background Art

[0002] Existing solid-liquid separation devices for sewage treatment usually use a stacked screw sludge dewatering machine. The main body of the stacked screw sludge dewatering machine is a filtering device formed by stacking fixed rings and movable rings with a spiral shaft passing through it. The front section is the concentration section and the rear section is the dewatering section. After the sludge is concentrated by gravity in the concentration section, it is transported to the dewatering section. During the forward process, as the filter gap and screw pitch gradually become smaller, and the back pressure plate has a blocking effect, internal pressure is generated and the volume continues to shrink, thereby achieving the purpose of sufficient dehydration.

[0003] However, the spiral sludge dewatering machine has the following problems during the solid-liquid separation and dehydration process:

[0004] Existing screw stacking sludge dewatering machines usually use a single screw to convey sludge. When using a single screw to convey sludge, there will be a problem of uneven radial velocity distribution, which causes the outer layer of sludge to directly contact the filter cartridge and easily move toward the filter seam under the thrust of the screw, resulting in faster water separation.

[0005] The inner layer of sludge is close to the spiral shaft and is subject to weak shear and extrusion forces. In particular, the sludge adheres to the center around the rotating shaft and is difficult to separate, resulting in a significant difference in dehydration efficiency between the inner and outer layers, which in turn affects the solid-liquid separation effect of the inner layer of the sludge. In response to the above problems, the inventors proposed a sewage treatment solid-liquid separation device to solve the above problems. Summary of the Invention

[0006] In order to solve the problem of difference in separation efficiency between inner and outer layers of sludge, the purpose of the present invention is to provide a solid-liquid separation device for sewage treatment.

[0007] To solve the above technical problems, the present invention adopts the following technical solution: a sewage treatment solid-liquid separation device, comprising a machine base, a machine cover and a filter assembly, wherein the machine cover is mounted on the top of the machine base, a liquid discharge port is provided on the outer wall of the machine base, a liquid holding cavity is provided inside the machine base, a feed pipe is provided on the outer wall of the machine cover, the filter assembly is mounted on the inner side of the machine cover, and the feed pipe leads to the filter assembly, characterized in that a large spiral drive assembly is mounted on the machine cover, and the large spiral drive assembly extends to the interior of the filter assembly;

[0008] A back pressure plate is installed on the large spiral drive assembly, and the large spiral drive assembly and the back pressure plate cooperate with each other to squeeze the sludge;

[0009] One end of the large spiral drive assembly is connected to a differential switching assembly, and a small spiral drive assembly is installed on the large spiral drive assembly. The large spiral drive assembly drives the small spiral drive assembly through the differential switching assembly;

[0010] A U-shaped plate is installed inside the hood, and the differential switching assembly is arranged inside the U-shaped plate, and the U-shaped plate is used to isolate the space between the differential switching assembly and the filter assembly;

[0011] The large spiral drive assembly cooperates with the small spiral drive assembly to squeeze the inner layer of sludge;

[0012] A laser displacement sensor is installed on the inner wall of the hood to monitor the matching distance between the large spiral drive assembly and the small spiral drive assembly.

[0013] Preferably, the filter assembly includes a fixed ring, a fixed rod and a movable ring, the fixed rod is fixedly connected to the inner wall of the hood, and several fixed rings are fixedly connected to the outer wall of the fixed rod. A movable ring is arranged between each of the fixed rings, and a water seepage gap is arranged between the fixed ring and the movable ring.

[0014] Preferably, a through hole is provided on the movable ring, the fixing rod passes through the through hole, and the diameter of the through hole is larger than the diameter of the fixing rod.

[0015] Preferably, the large screw drive assembly includes a first motor and a large screw, the first motor is installed on the outer wall of the hood, the output shaft of the first motor is connected to a rotating shaft, the rotating shaft passes through the hood and is rotatably connected, and the large screw is fixedly connected to the outer wall of the rotating shaft.

[0016] Preferably, a shaking component is provided on the outer side of the top of the movable ring, and the output shaft of the first motor drives the shaking component;

[0017] A discharge port is provided on the outer wall of the machine cover, and a back pressure plate is installed on the output shaft of the first motor.

[0018] Preferably, the back pressure plate is at the outside of the discharge port and leaves a gap, the differential switching assembly includes a cylinder and a drive frame, the cylinder is installed on the inner side of the machine cover, the drive frame is installed on the output end of the cylinder, the inner side of the drive frame is rotatably connected to a rotating ring, a connecting rod is installed on the outer wall of the rotating ring, one end of the connecting rod is fixedly connected to a large gear 1, a round rod is fixedly connected to the outer wall of the large gear 1, the large gear 1 is connected to a small gear 1 through the round rod, the large gear 1 and the small gear 1 are slidably connected on the outer wall of the rotating shaft, the inner wall of the U-shaped plate is rotatably connected to a rotating shaft, and the rotating shaft is fixedly connected with a transmission gear, a large gear 2 and a small gear 2 in sequence.

[0019] Preferably, when the large gear 2 is engaged with the small gear 1, the large gear 1 and the small gear 2 are misaligned and do not engage with each other.

[0020] Preferably, the small spiral drive assembly includes a small spiral and a gear cylinder, the gear cylinder is rotatably connected to the outer wall of the rotating shaft, the gear cylinder is engaged with the transmission gear, the small spiral is spirally sleeved on the outer wall of the rotating shaft, the blades of the small spiral and the blades of the large spiral are spaced apart, and the gear cylinder passes through the U-shaped plate and is fixedly connected to the small spiral.

[0021] Preferably, the interior of the rotating shaft is set as a hollow structure, a plurality of small holes are opened on the outer wall of the rotating shaft, a channel is set inside the machine base, one end of the rotating shaft is rotatably connected to and communicated with the channel, and the channel leads to the interior of the liquid holding chamber.

[0022] Preferably, the shaking component includes a spring and a steel ball, a transmission belt is connected to the outer wall of the output shaft of the first motor, one end of the transmission belt is connected to a reciprocating screw, the reciprocating screw is rotatably connected to the machine cover, the inside of the machine cover is connected to a guide rail, a slider is threadedly connected to the outer wall of the reciprocating screw, a spring is provided at the bottom of the slider, the bottom of the slider is slidably connected to a steel ball, and one end of the spring is fixedly connected to the steel ball.

[0023] Compared with the prior art, the present invention has the following beneficial effects:

[0024] 1. The present invention sets a small spiral and a large spiral, and adjusts the spacing between the small spiral and the large spiral. During the adjustment process, the inner layer of sludge is squeezed, thereby improving the solid-liquid separation effect of the inner layer of sludge and reducing the difference in separation efficiency between the inner and outer layers of sludge. The interior of the rotating shaft is hollow and has small holes. The filtrate of the initial filtration can enter the interior of the rotating shaft through the small holes and flow into the liquid cavity of the machine base through the channel to realize the recovery of the filtrate.

[0025] 2. The present invention sets a differential switching assembly. When the cylinder pushes the drive frame to make the small gear 1 mesh with the large gear 2, the large spiral drives the small gear 1 to rotate through the rotating shaft, driving the large gear 2 and the transmission gear to rotate. The transmission gear drives the gear barrel and the small spiral. The small spiral is equivalent to the large spiral rotating at a specific speed ratio. Switching the cylinder stroke can make the large gear 1 mesh with the small gear 2, realizing the reverse switching of the relative speed of the double spirals. The speed ratio is dynamically switched by the cylinder and the gear set to adapt to different sludge characteristics, thereby improving the solid-liquid separation adaptability of the setting.

[0026] 3. The present invention sets a shaking assembly. The first motor drives the reciprocating screw to rotate through the transmission belt, driving the slider and the steel ball to reciprocate. When the movable ring moves, the movable ring is struck to generate a slight vibration to prevent sludge from clogging the water seepage gap. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0028] Figure 1 It is a schematic diagram of the overall structure of the present invention.

[0029] Figure 2 It is a schematic diagram of the internal structure of the present invention.

[0030] Figure 3 It is a cross-sectional view of the internal structure of the present invention.

[0031] Figure 4 It is a schematic diagram of the structure of the fixing ring and the fixing rod of the present invention.

[0032] Figure 5 It is a schematic diagram of the movable ring structure of the present invention.

[0033] Figure 6 For the present invention Figure 3 Schematic diagram of the structure at point A.

[0034] Figure 7 Schematic diagram of the large helix and small helix structure of the present invention.

[0035] Figure 8 Schematic diagram of the differential switching assembly and spiral structure of the present invention.

[0036] Figure 9 For the present invention Figure 8 Schematic diagram of the structure in B.

[0037] Figure 10 Schematic diagram of the gear structure of the present invention.

[0038] Figure 11 Schematic diagram of the structure of the dither component of the present invention.

[0039] Figure 12 It is a schematic diagram of the steel ball structure of the present invention.

[0040] Figure: 1, machine base; 101, drain port; 102, channel; 2, machine cover; 3, large screw drive assembly; 301, first motor; 302, rotating shaft; 303, large screw; 4, feed pipe; 5, shaking assembly; 501, reciprocating screw; 502, transmission belt; 503, slider; 504, guide rail; 505, spring; 506, steel ball; 6, laser displacement sensor; 7, filter assembly; 701, fixed Ring; 702, fixed rod; 703, movable ring; 704, through hole; 8, U-shaped plate; 9, differential switching assembly; 901, cylinder; 902, drive frame; 903, large gear 1; 904, small gear 1; 905, small gear 2; 906, large gear 2; 908, rotating ring; 907, transmission gear; 10, back pressure plate; 11, small screw drive assembly; 1101, small screw; 1102, gear cylinder. DETAILED DESCRIPTION

[0041] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0042] Example

[0043] like Figures 1-12 As shown, the present invention provides a solid-liquid separation device for sewage treatment, comprising a base 1, a hood 2 and a filter assembly 7. The hood 2 is mounted on the top of the base 1. A drain port 101 is provided on the outer wall of the base 1. A liquid chamber is provided inside the base 1. A feed pipe 4 is provided on the outer wall of the hood 2. The filter assembly 7 is mounted on the inner side of the hood 2. The feed pipe 4 leads to the filter assembly 7. A large spiral drive assembly 3 is mounted on the hood 2. The large spiral drive assembly 3 extends to the interior of the filter assembly 7.

[0044] A back pressure plate 10 is installed on the large spiral drive assembly 3. The large spiral drive assembly 3 and the back pressure plate 10 cooperate with each other to squeeze the sludge;

[0045] One end of the large spiral drive assembly 3 is connected to the differential switching assembly 9, and the small spiral drive assembly 11 is installed on the large spiral drive assembly 3. The large spiral drive assembly 3 drives the small spiral drive assembly 11 through the differential switching assembly 9;

[0046] A U-shaped plate 8 is installed inside the hood 2, and the differential switching assembly 9 is arranged inside the U-shaped plate 8. The U-shaped plate 8 is used to isolate the space between the differential switching assembly 9 and the filter assembly 7;

[0047] The large spiral drive assembly 3 cooperates with the small spiral drive assembly 11 to squeeze the inner layer of sludge;

[0048] A laser displacement sensor 6 is installed on the inner wall of the hood 2 to monitor the matching distance between the large spiral drive assembly 3 and the small spiral drive assembly 11.

[0049] The filter assembly 7 includes a fixed ring 701, a fixed rod 702 and a movable ring 703. The fixed rod 702 is fixedly connected to the inner wall of the hood 2. Several fixed rings 701 are fixedly connected to the outer wall of the fixed rod 702. A movable ring 703 is provided between each fixed ring 701. A water seepage gap is provided between the fixed ring 701 and the movable ring 703.

[0050] The purpose of such a setting is that the seepage gap between the fixed ring 701 and the movable ring 703 allows water to pass through, preliminarily separating the filtrate, which flows into the liquid cavity of the machine base 1 and is discharged through the drain port 101.

[0051] The movable ring 703 is provided with a through hole 704 through which the fixing rod 702 passes. The diameter of the through hole 704 is larger than that of the fixing rod 702.

[0052] The purpose of this arrangement is that during the spiral rotation of the large spiral 303, the outer wall pushes the movable ring 703 a small amount, allowing the movable ring 703 to move relative to the fixed ring 701. The mutual friction is conducive to the discharge of sludge in the gap between the fixed ring 701 and the movable ring 703.

[0053] The large screw drive assembly 3 includes a first motor 301 and a large screw 303. The first motor 301 is mounted on the outer wall of the hood 2. The output shaft of the first motor 301 is connected to a rotating shaft 302. The rotating shaft 302 passes through the hood 2 and is rotatably connected. The large screw 303 is fixedly connected to the outer wall of the rotating shaft 302.

[0054] The purpose of this arrangement is that the first motor 301 drives the rotating shaft 302 to rotate, driving the large spiral 303 to push the sludge toward the outlet.

[0055] A shaking assembly 5 is provided on the outer side of the top of the movable ring 703 , and the output shaft of the first motor 301 drives the shaking assembly 5 ;

[0056] A discharge port is provided on the outer wall of the hood 2, and a back pressure plate 10 is installed on the output shaft of the first motor 301. The purpose of this arrangement is that the output shaft of the first motor 301 drives the shaking component 5, and the shaking component 5 vibrates the fixed ring 701 and the movable ring 703 slightly, which is conducive to the discharge of sludge from the gap.

[0057] The back pressure plate 10 is located on the outside of the discharge port and leaves a gap. The differential switching assembly 9 includes a cylinder 901 and a drive frame 902. The cylinder 901 is installed on the inside of the machine cover 2, and the drive frame 902 is installed on the output end of the cylinder 901. The inner side of the drive frame 902 is rotatably connected to a rotating ring 908. A connecting rod is installed on the outer wall of the rotating ring 908. One end of the connecting rod is fixedly connected to a large gear 903. A round rod is fixedly connected to the outer wall of the large gear 903. The large gear 903 is connected to a small gear 904 through the round rod. Wheel 1 903 and pinion 1 904 are slidably connected on the outer wall of the rotating shaft 302, and a rotating shaft is rotatably connected to the inner wall of the U-shaped plate 8, and a transmission gear 907, a large gear 2 906 and a small gear 2 905 are fixedly connected to the rotating shaft in sequence. The purpose of this arrangement is to drive the driving frame 902 to slide by the cylinder 901, switch the meshing state of the large gear 1 903, small gear 1 904 and the large gear 2 906, small gear 2 905, and realize the switching of the large and small spiral speed ratios, such as switching between 3:2 and 2:3.

[0058] When the large gear 2 906 is meshing with the small gear 1 904 , the large gear 1 903 and the small gear 2 905 are offset and do not mesh. The purpose of this arrangement is to achieve the effect of gear speed change.

[0059] The small screw drive assembly 11 includes a small screw 1101 and a gear cylinder 1102. The gear cylinder 1102 is rotatably connected to the outer wall of the rotating shaft 302. The gear cylinder 1102 is engaged with the transmission gear 907. The small screw 1101 is spirally sleeved on the outer wall of the rotating shaft 302. The blades of the small screw 1101 are spaced apart from the blades of the large screw 303. The gear cylinder 1102 passes through the U-shaped plate 8 and is fixedly connected to the small screw 1101.

[0060] The purpose of this arrangement is that the rotating shaft 302 drives the driving small gear 1 904 to rotate, drives the large gear 2 906 and the transmission gear 907 to rotate, and the transmission gear 907 drives the gear cylinder 1102 and the small spiral 1101, so that the small spiral 1101 and the large spiral 303 rotate in the same direction at a differential speed.

[0061] The interior of the rotating shaft 302 is configured as a hollow structure, and a plurality of small holes are opened on the outer wall of the rotating shaft 302. A channel 102 is provided inside the base 1. One end of the rotating shaft 302 is rotatably connected to and communicates with the channel 102. The channel 102 leads to the interior of the liquid chamber.

[0062] The purpose of this arrangement is that when the small spiral 1101 cooperates with the large spiral 303 to squeeze the inner layer of sludge, the interior of the rotating shaft 302 is hollow and has small holes. The filtrate from the preliminary filtration can enter the interior of the rotating shaft through the small holes and flow into the liquid holding chamber of the machine base 1 through the channel 102, thereby realizing the recovery of the filtrate.

[0063] The shaking assembly 5 includes a spring 505 and a steel ball 506. A transmission belt 502 is connected to the outer wall of the output shaft of the first motor 301. One end of the transmission belt 502 is connected to a reciprocating screw 501. The reciprocating screw 501 is rotatably connected to the hood 2. The interior of the hood 2 is connected to a guide rail 504. A slider 503 is threadedly connected to the outer wall of the reciprocating screw 501. A spring 505 is provided at the bottom of the slider 503. A steel ball 506 is slidably connected to the bottom of the slider 503. One end of the spring 505 is fixedly connected to the steel ball 506.

[0064] The purpose of this arrangement is that the first motor 301 drives the reciprocating screw 501 to rotate through the transmission belt 502, driving the slider 503 and the steel ball 506 to reciprocate. When the movable ring 703 moves, the movable ring 703 is struck to generate a slight vibration, and the spring 505 allows the steel ball 506 to reset and gives the steel ball a certain elasticity.

[0065] Working principle: The first motor 301 drives the rotating shaft 302 to rotate, driving the large spiral 303 to push the sludge to the outlet, and at the same time drives the small spiral 1101 through the differential switching component 9. The small spiral 1101 is sleeved on the rotating shaft 302 and engages with the transmission gear 907 of the differential switching component 9 through the gear cylinder 1102 to achieve differential rotation with the large spiral 303. The small spiral 1101 rotates in the same direction as the large spiral 303. Figure 7 As shown;

[0066] The cylinder 901 drives the drive frame 902 to move, switching the meshing state of the large gear 1 903, small gear 1 904 and the large gear 2 906, small gear 2 905 to achieve the switching of the large and small spiral speed ratios, such as switching between 3:2 and 2:3. The laser displacement sensor 6 monitors the blade spacing between the large spiral 303 and the small spiral 1101 in real time to prevent interference and feedback to the control system to adjust the differential ratio. The filter assembly 7 separates water through the water seepage gap between the fixed ring 701 and the movable ring 703. The back pressure plate 10 cooperates with the spiral at the outlet to form an extrusion pressure field.

[0067] like Figure 8 and Figure 9As shown, when the cylinder 901 pushes the drive frame 902 to make the small gear 1 904 mesh with the large gear 2 906, the large spiral 303 drives the driving small gear 1 904 to rotate through the rotating shaft 302, driving the large gear 2 906 and the transmission gear 907 to rotate, and the transmission gear 907 drives the gear cylinder 1102 and the small spiral 1101. The small spiral 1101 is equivalent to the large spiral 303 rotating at a specific speed, such as 3:2. Switching the cylinder stroke can make the large gear 1 903 mesh with the small gear 2 905, changing the speed, such as 2:3, to achieve reverse switching of the relative speed of the double spiral. The laser displacement sensor 6 measures the spacing between the large and small spiral blades in real time. When the spacing is less than the safety threshold, the control system is triggered to adjust the differential ratio to avoid blade collision. When the sludge is pushed to the outlet through the double spiral, the back pressure plate 10 blocks the sludge from being discharged, and forms an extrusion pressure with the spiral propulsion force to further remove the bound water.

[0068] The model of the laser displacement sensor 6 can be MICRO-EPSILON. Those skilled in the art can adjust and control the distance between the small spiral 1101 and the large spiral 303 by the following means. The connection method between the laser displacement sensor 6 and the PLC is a mature existing technology. For details, please refer to the measurement and control system construction method disclosed in "Sensors and Detection Technology". Its logic is mainly to monitor the distance between the small spiral 1101 and the large spiral 303 to trigger the adjustment of the distance between the small spiral 1101 and the large spiral 303;

[0069] The sludge enters the filter assembly 7 in the machine cover 2 through the feed pipe 4. The large spiral 303 rotates to push the sludge toward the outlet. The water seepage gap between the fixed ring 701 and the movable ring 703 allows water to pass through, and the filtrate is initially separated and flows into the liquid chamber of the machine base 1 and is discharged through the drain port 101.

[0070] The first motor 301 drives the reciprocating screw 501 to rotate through the transmission belt 502, driving the slider 503 and the steel ball 506 to reciprocate. When the movable ring 703 moves, it knocks on the movable ring 703 to generate a slight vibration, thereby preventing sludge from clogging the water seepage gap. The diameter of the through hole 704 is larger than the diameter of the fixed rod 702. In this arrangement, during the spiral rotation of the large screw 303, the outer wall pushes the movable ring 703 a small amount, allowing the movable ring 703 to move relative to the fixed ring 701. The mutual friction is conducive to the discharge of sludge in the gap between the fixed ring 701 and the movable ring 703;

[0071] When the small spiral 1101 cooperates with the large spiral 303 to squeeze the inner layer of sludge, the interior of the rotating shaft 302 is hollow and has small holes. The filtrate after preliminary filtration can enter the interior of the rotating shaft 302 through the small holes and flow into the liquid chamber of the machine base 1 through the channel 102 to realize the recovery of the filtrate. The dehydrated mud cake is discharged from the gap between the back pressure plate 10 and the discharge port, completing the solid-liquid separation.

[0072] The standard parts used in the present invention can all be purchased from the market, and special-shaped parts can be customized according to the description in the specification and drawings. The specific connection methods of each part adopt conventional means such as mature bolts, rivets, welding, etc. in the existing technology. The machinery, parts and equipment all adopt conventional models in the existing technology, and the circuit connection adopts the conventional connection method in the existing technology, which will not be described in detail here.

[0073] Obviously, those skilled in the art may make various changes and modifications to the present invention without departing from the spirit and scope of the present invention. Thus, if such changes and modifications fall within the scope of the claims and their equivalents, the present invention is intended to include such changes and modifications.

Claims

1. A solid-liquid separation device for sewage treatment, comprising a base (1), a cover (2) and a filter assembly (7), wherein the cover (2) is mounted on the top of the base (1), a liquid discharge port (101) is provided on the outer wall of the base (1), a liquid receiving cavity is provided inside the base (1), a feed pipe (4) is provided on the outer wall of the cover (2), the filter assembly (7) is mounted on the inner side of the cover (2), and the feed pipe (4) leads to the filter assembly (7), characterized in that: A large spiral drive assembly (3) is mounted on the hood (2), and the large spiral drive assembly (3) extends to the interior of the filter assembly (7); A back pressure plate (10) is installed on the large spiral drive assembly (3), and the large spiral drive assembly (3) and the back pressure plate (10) cooperate with each other to squeeze the sludge; One end of the large spiral drive assembly (3) is connected to a differential switching assembly (9), a small spiral drive assembly (11) is mounted on the large spiral drive assembly (3), and the large spiral drive assembly (3) drives the small spiral drive assembly (11) via the differential switching assembly (9); A U-shaped plate (8) is installed inside the hood (2), and the differential switching assembly (9) is arranged inside the U-shaped plate (8). The U-shaped plate (8) is used to isolate the space between the differential switching assembly (9) and the filter assembly (7); The large spiral drive assembly (3) cooperates with the small spiral drive assembly (11) to squeeze the inner layer of sludge; A laser displacement sensor (6) is installed on the inner wall of the hood (2) for monitoring the matching distance between the large spiral drive assembly (3) and the small spiral drive assembly (11).

2. A solid-liquid separation device for sewage treatment according to claim 1, characterized in that: The filter assembly (7) comprises a fixed ring (701), a fixed rod (702) and a movable ring (703); the fixed rod (702) is fixedly connected to the inner wall of the hood (2); a plurality of the fixed rings (701) are fixedly connected to the outer wall of the fixed rod (702); a movable ring (703) is provided between each of the fixed rings (701); and a water seepage gap is provided between the fixed ring (701) and the movable ring (703).

3. A solid-liquid separation device for sewage treatment according to claim 2, characterized in that: The movable ring (703) is provided with a through hole (704), the fixing rod (702) passes through the through hole (704), and the diameter of the through hole (704) is larger than the diameter of the fixing rod (702).

4. A solid-liquid separation device for sewage treatment according to claim 3, characterized in that: The large screw drive assembly (3) comprises a first motor (301) and a large screw (303), wherein the first motor (301) is mounted on the outer wall of the hood (2), a rotating shaft (302) is connected to the output shaft of the first motor (301), the rotating shaft (302) passes through the hood (2) and is rotatably connected, and the large screw (303) is fixedly connected to the outer wall of the rotating shaft (302).

5. A solid-liquid separation device for sewage treatment according to claim 4, characterized in that: A shaking component (5) is provided on the outer side of the top of the movable ring (703), and the output shaft of the first motor (301) drives the shaking component (5); A discharge port is provided on the outer wall of the hood (2), and a back pressure plate (10) is installed on the output shaft of the first motor (301).

6. A solid-liquid separation device for sewage treatment according to claim 5, characterized in that: The back pressure plate (10) is located outside the discharge port and has a gap therebetween. The differential switching assembly (9) includes a cylinder (901) and a drive frame (902). The cylinder (901) is mounted on the inner side of the hood (2). The drive frame (902) is mounted on the output end of the cylinder (901). The inner side of the drive frame (902) is rotatably connected to a rotating ring (908). A connecting rod is mounted on the outer wall of the rotating ring (908). One end of the connecting rod is fixedly connected to a large gear. Wheel 1 (903), a round rod is fixedly connected to the outer wall of the large gear 1 (903), the large gear 1 (903) is connected to the small gear 1 (904) through the round rod, the large gear 1 (903) and the small gear 1 (904) are slidably connected on the outer wall of the rotating shaft (302), and a rotating shaft is rotatably connected to the inner wall of the U-shaped plate (8), and the rotating shaft is fixedly connected to the transmission gear (907), large gear 2 (906) and small gear 2 (905) in sequence.

7. A solid-liquid separation device for sewage treatment according to claim 6, characterized in that: When the large gear 2 (906) is engaged with the small gear 1 (904), the large gear 1 (903) and the small gear 2 (905) are misaligned and do not engage.

8. A solid-liquid separation device for sewage treatment according to claim 7, characterized in that: The small spiral drive assembly (11) comprises a small spiral (1101) and a gear cylinder (1102). The gear cylinder (1102) is rotatably connected to the outer wall of the rotating shaft (302). The gear cylinder (1102) is engaged with the transmission gear (907). The small spiral (1101) is spirally sleeved on the outer wall of the rotating shaft (302). The blades of the small spiral (1101) and the blades of the large spiral (303) are spaced apart. The gear cylinder (1102) passes through the U-shaped plate (8) and is fixedly connected to the small spiral (1101).

9. A solid-liquid separation device for sewage treatment according to claim 8, characterized in that: The interior of the rotating shaft (302) is configured as a hollow structure, and a plurality of small holes are provided on the outer wall of the rotating shaft (302). A channel (102) is provided inside the machine base (1), and one end of the rotating shaft (302) is rotatably connected to and communicates with the channel (102), and the channel (102) leads to the interior of the liquid chamber.

10. A solid-liquid separation device for sewage treatment according to claim 9, characterized in that: The shaking component (5) includes a spring (505) and a steel ball (506), a transmission belt (502) is connected to the outer wall of the output shaft of the first motor (301), one end of the transmission belt (502) is connected to a reciprocating screw (501), the reciprocating screw (501) is rotatably connected to the hood (2), the interior of the hood (2) is connected to a guide rail (504), a slider (503) is threadedly connected to the outer wall of the reciprocating screw (501), a spring (505) is provided at the bottom of the slider (503), the bottom of the slider (503) is slidably connected to the steel ball (506), and one end of the spring (505) is fixedly connected to the steel ball (506).

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