A solid-liquid separator

Abstract

The present invention relates to a solid-liquid separator, comprising a separator body, which includes a first cavity and a second cavity interconnected internally, a sewage inlet and a filtrate outlet respectively connected to the first cavity and the second cavity, and a discharge port provided at the bottom of the separator body; a conveying assembly, which includes a first auger, a second auger, and a drive source, the first auger and the second auger being respectively disposed in the first cavity and the second cavity, the drive source driving the first auger and the second auger to rotate; a low-frequency pulsating excitation electromagnet mounted at the bottom of the separator body and employing a periodic current, wherein a cycle includes a high-potential current in the first half of the cycle and a low-potential current in the second half of the cycle, and the first auger and the second auger rotate only when in the low-potential cycle. The separator can continuously and automatically discharge separated solid materials, has no filter elements, does not require frequent maintenance and cleaning, and can maintain long-term, high-efficiency filtration.

Description

Technical Field

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

[0002] In the production industries of ferromagnetic catalysts and other ferromagnetic materials (such as physical metallurgy of ferromagnetic metal materials, ferromagnetic metal oxide pigments, stealth aircraft coatings, metal oxides for data memory, etc.), there are many ferromagnetic two-phase process fluids that require high-efficiency solid-liquid separation. At the same time, a large amount of industrial wastewater containing ferromagnetic tiny suspended solids is also discharged from various industrial production lines. It is necessary to use a high-efficiency liquid filter to filter out the ferromagnetic tiny suspended solids in order to extract qualified solid products and reuse these industrial wastewaters, or discharge them in accordance with the wastewater discharge standards.

[0003] The existing solid-liquid separation devices for filtering and treating industrial wastewater containing ferromagnetic micro-suspended solids are mainly of the following types: (1) bag-type liquid filter; (2) filter device with certain self-cleaning and automatic sewage discharge capabilities; (3) filter press; (4) high-speed solid-liquid separator; (5) magnetic liquid filter with intermittent discharge (sewage discharge);

[0004] Among them, 1. Bag-type liquid filters require frequent replacement of filter bags, which has high consumables and maintenance costs, affects production efficiency and causes certain pollution;

[0005] 2. Existing filtering devices with certain self-cleaning and automatic sewage discharge capabilities generally have filter elements. The cleanliness of the filter elements must be ensured to ensure the smooth progress of the liquid filtration process. If the filter elements cannot be cleaned in time, the filtration efficiency of the filter device will be affected.

[0006] 3. Filter press is only suitable for the sludge dehydration and drying process at the end of the production process, and occupies a large area, has low production efficiency, poor stability, and high maintenance cost and difficulty;

[0007] 4. The high-speed centrifugal solid-liquid separator has a complex structure, high cost, poor operating stability and is difficult to maintain;

[0008] 5. Generally, intermittent unloading (sewage discharge) magnetic filters mostly adopt a permanent magnet magnetic tube bundle structure. Since the outer surface of the permanent magnet sleeve cannot be thoroughly backwashed with high pressure and automatically scraped clean by a mechanical machine, after long-term use, a colloidal solid attachment layer that is difficult to be washed away is easily accumulated on the outer surface of each permanent magnet sleeve. The layer continues to thicken and harden, resulting in a large additional magnetic resistance, which will reduce the filtration efficiency, affect the stable operation of the filtration device and increase the cost of equipment maintenance. At the same time, this old-fashioned magnetic filter must adopt an intermittent unloading (sewage discharge) method, which not only makes the control system complex and expensive, but also has very low working efficiency. Summary of the Invention

[0009] To this end, the technical problem to be solved by the present invention is to overcome the problems in the prior art of the solid-liquid separation device for filtering industrial wastewater containing ferromagnetic tiny suspended solids, such as poor filtration effect and filtration stability, which affects production efficiency, and the difficulty and high maintenance cost of the device.

[0010] In order to solve the above technical problems, the present invention provides a solid-liquid separator, comprising:

[0011] A separator body, the separator body including an internal cavity, an inner baffle extending in the longitudinal direction of the cavity being installed in the cavity, the inner baffle dividing the cavity into a first cavity and a second cavity, and the separator body being arranged at an angle, a notch being provided at the lower end of the inner baffle, the notch communicating with the first cavity and the second cavity, a sewage inlet and a filtrate outlet communicating with the first cavity and the second cavity being respectively provided on the side of the separator body, and a discharge port being provided at the bottom of the higher end of the separator body;

[0012] A conveying assembly, the conveying assembly comprising a first auger, a second auger, and a drive source, the first auger and the second auger being respectively arranged to rotate in parallel in the first cavity and the second cavity, the drive source driving the first auger and the second auger to rotate synchronously in opposite directions;

[0013] A low-frequency pulsating excitation electromagnet is installed on the separator body. The excitation current of the low-frequency pulsating excitation electromagnet is a periodic current, which includes a high-potential current in the first half of the cycle and a low-potential current in the second half of the cycle within one cycle. Only when the excitation current is in the low-potential half cycle, the driving source drives the first auger and the second auger to rotate.

[0014] In one embodiment of the present invention, the separator body includes a trough body and a top cover, both ends of the trough body are connected to end plates, and the top cover is arranged at the open end of the trough body to form the separator body.

[0015] In one embodiment of the present invention, the cross-section of the trough body is W-shaped, including two arc-shaped spaces extending along the length direction of the trough body and symmetrical to each other, and the first auger and the second auger are respectively arranged in the two arc-shaped spaces.

[0016] In one embodiment of the present invention, the low-frequency pulsating excitation electromagnet is symmetrically provided with two arcuate grooves extending in its length direction, the shape of the arcuate grooves corresponds to the bottom shape of the groove body, and the groove body is embedded in the arcuate grooves.

[0017] In one embodiment of the present invention, the sewage inlet and the filtrate outlet are both opened on a side of the separator body with a higher height.

[0018] In one embodiment of the present invention, the spiral lines of the first auger and the second auger are in opposite directions.

[0019] In one embodiment of the present invention, a bracket is further included, the separator body is arranged on the bracket, the bracket is connected to a support seat, the driving source is arranged on the support seat, the output end of the driving source is coaxially connected to one end of the first auger, the other end of the first auger is coaxially connected to a driving gear, and one end of the second auger is provided with a driven gear used in conjunction with the driving gear, and the driving gear is meshed with the driven gear.

[0020] In one embodiment of the present invention, the highest liquid level of the solid-liquid separator during operation is lower than the height of the discharge port.

[0021] In one embodiment of the present invention, the low-frequency pulsating excitation electromagnet can be excited by a sinusoidal pulsating current or an asymmetric very low frequency square wave pulsating current.

[0022] In one embodiment of the present invention, the driving source may be a stepping motor, and the driving source adopts a pulse power supply.

[0023] The above technical solution of the present invention has the following advantages over the prior art:

[0024] The solid-liquid separator described in the present invention includes a separator body, a conveying assembly and a low-frequency pulsating excitation electromagnet to form a filtering device without a filter element. The electromagnetic field with a pulsating field strength formed by the very low-frequency pulsating excitation electromagnet is used to cooperate with a driving source to drive the conveying auger structure, so that the driving source does not rotate during the time period when the low-frequency pulsating excitation electromagnet generates a large magnetic field strength. The strong magnetic field generated is used to efficiently separate and gather magnetic solid particles in sewage. During the time period when the low-frequency pulsating excitation electromagnet generates a small magnetic field, the driving source drives the first auger and the second auger to rotate, so as to transport the magnetic solid particles attracted and gathered at the bottom of the cavity. The solid particles are eventually discharged from the discharge port to the outside of the equipment, thereby realizing solid-liquid separation; the solid-liquid separation device of the present invention can perform solid-liquid separation on sewage containing tiny ferromagnetic solid suspended matter, and separate the separated solid matter and transport it to the outside of the equipment for treatment. At the same time, during the transportation process, the solid-liquid separation working surface can be automatically scraped clean to ensure the cleanliness of the equipment, avoid the accumulation of dirt causing the attenuation of the magnetic adsorption filtration efficiency, and ensure the efficiency and stability of the solid-liquid separation process; the structure does not require filter elements, which reduces the cost of replacing or maintaining filter elements, ensures that the filtration work is carried out efficiently for a long time, and significantly improves the operational reliability of the solid-liquid separator. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] In order to make the content of the present invention more clearly understood, the present invention is further described in detail below based on specific embodiments of the present invention in conjunction with the accompanying drawings, wherein

[0026] Figure 1 1 is a schematic diagram of the overall structure of a solid-liquid separator according to a preferred embodiment of the present invention;

[0027] Figure 2 yes Figure 1 A top view of the solid-liquid separator shown;

[0028] Figure 3 yes Figure 1 AA section of the solid-liquid separator shown;

[0029] Figure 4 yes Figure 1 Schematic diagram of the inclined arrangement of the solid-liquid separator shown;

[0030] Figure 5 yes Figure 1 Schematic diagram showing the relationship between the excitation current of the low-frequency pulsating excitation electromagnet of the solid-liquid separator and the operating state of the driving source;

[0031] Figure 6 Schematic diagram of the relationship between the excitation current and the operating state of the driving source of the low-frequency pulsating excitation electromagnet according to the second embodiment of the present invention.

[0032] Explanation of the reference numerals in the accompanying drawings in the specification: 1. Separator body; 11. Inner partition; 111. Notch; 12. First cavity; 13. Second cavity; 14. Sewage inlet; 15. Filtrate outlet; 16. Discharge port; 17. Tank body; 18. Top cover; 19. End plate; 2. Conveying assembly; 21. First auger; 22. Second auger; 23. Driving source; 3. Low-frequency pulsating excitation electromagnet; 4. Bracket; 41. Support seat; 42. Driving gear; 43. Driven gear; 44. Bearing seat; A. Maximum liquid level. DETAILED DESCRIPTION

[0033] The present invention will be further described below with reference to the accompanying drawings and specific embodiments so that those skilled in the art can better understand the present invention and implement it. However, the embodiments are not intended to limit the present invention.

[0034] Example 1

[0035] Reference Figure 1-Figure 5 As shown, a solid-liquid separator of the present invention comprises:

[0036] The separator body 1 includes an internal cavity, in which an inner baffle 11 extending in its longitudinal direction is installed. The inner baffle 11 divides the cavity into a first cavity 12 and a second cavity 13, and the separator body 1 is arranged at an angle. A notch 111 is provided at the lower end of the inner baffle 11, and the notch 111 connects the first cavity 12 and the second cavity 13. A sewage inlet 14 and a filtrate outlet 15 connecting the first cavity 12 and the second cavity 13 are respectively provided on the side of the separator body 1. A discharge port 16 is provided at the bottom of the higher end of the separator body 1;

[0037] The conveying assembly 2 includes a first auger 21, a second auger 22, and a drive source 23. The first auger 21 and the second auger 22 are respectively arranged to rotate parallel to each other in the first cavity 12 and the second cavity 13. The drive source 23 drives the first auger 21 and the second auger 22 to rotate synchronously in opposite directions.

[0038] The low-frequency pulsating excitation electromagnet 3 is installed on the separator body 1. The excitation current of the low-frequency pulsating excitation electromagnet 3 is a periodic current, which includes a high-potential current in the first half of the cycle and a low-potential current in the second half of the cycle in one cycle. Only when the excitation current is in the low-potential half cycle, the driving source 23 will drive the first auger 21 and the second auger 22 to rotate.

[0039] Specifically, both ends of the main shaft of the first auger 21 and the second auger 22 pass through both ends of the separator body 1, and the two ends of the main shaft of the first auger 21 and the second auger 22 are rotatably connected to the bearing seat 44 set on the bracket 4 and the support seat 41 respectively through bearings, forming a dual-axis shaft system. At the same time, the lower end of the first auger 21 is coaxially connected to the driving gear 42, and the other end is connected to the output end of the driving source 23. The lower end of the second auger 22 is coaxially connected to the driven gear 43 meshing with the driving gear 42. The driving source 23 can drive the first auger 21 and the second auger 22 to rotate synchronously in opposite directions; the first auger 21 can be clockwise and the second auger 22 can be counterclockwise. More preferably, the main shaft of the first auger 21 and the main shaft of the second auger 22 are both provided with sealing boxes at the positions where they pass through the separator body. The sealing boxes are used to seal the cavity of the equipment to ensure that the solid and liquid process media inside the equipment will not leak out and cause leakage, thereby reducing the wear of the shaft system components.

[0040] Specifically, the sewage inlet 14 is arranged on a side of the separator body 1 with a higher height, the sewage inlet 14 is connected to the first cavity 12, and the sewage inlet 14 is located on the side of the discharge port 16 away from the driving source 23; the sewage to be treated is input into the separator body 1 from the sewage inlet 14, and the sewage passes through the first cavity 12 and enters the second cavity 13 through the notch 111 of the inner partition 11. The sewage to be treated is separated from ferromagnetic tiny suspended solids in the first cavity 12 and the second cavity 13, and the separated filtrate is discharged from the filtrate outlet 15 connected to the second cavity 13.

[0041] Specifically, during the flow of a two-phase process fluid or industrial wastewater containing tiny ferromagnetic solid suspended matter within the apparatus, the magnetic solid particles in the process fluid or industrial wastewater are intermittently attracted by the electromagnetic field generated by the low-frequency pulsating excitation electromagnet 3, thereby being intermittently adsorbed and eventually gathering at the bottom of the cavity of the separator body 1. During the half-cycle of the electromagnetic field with low intensity, the magnetic solid particles gathered at the bottom of the cavity are transported upward by the first auger 21 and the second auger 22 (from the lower end of the separator body 1 to the higher end thereof), and are ultimately transported to the top of the discharge port 16 and fall into the discharge port 16, thereby completing the solid-liquid separation of the two-phase fluid containing magnetic particles. It should be noted that during the entire process of the continuous pulsating solid-liquid separation described above, the maximum liquid level of the wastewater within the apparatus must always be strictly controlled so that it does not exceed the height of the discharge port 16 to prevent the filtered liquid or wastewater from leaking into the discharge port 16. It can be imagined that the excitation current used by the low-frequency pulsating excitation electromagnet 3 can not only be a periodic current with a high potential current in the first half cycle and a low potential current in the second half cycle, but also a periodic current with a low potential current in the first half cycle and a high potential current in the second half cycle; and it only needs to satisfy the continuous changes in high potential current and low potential current within one cycle.

[0042] Specifically, the excitation current can be a sinusoidal pulsating current. The excitation current of the electromagnet is proportional to the strength of the magnetic field formed by its excitation. Therefore, when the excitation current of the low-frequency pulsating excitation electromagnet 3 is a sinusoidal pulsating current, the magnetic field characteristics it generates correspond to the periodic characteristics of the sinusoidal pulsating current. Specifically, within one cycle of the sinusoidal pulse current, when the sinusoidal pulse current is in a half cycle with a larger current intensity, a larger magnetic field intensity is generated; when the sinusoidal pulse current is in a half cycle with a smaller current intensity, a smaller magnetic field intensity is generated. By utilizing this characteristic law, the driving source 23 does not rotate during the time period when the low-frequency pulsating excitation electromagnet 3 generates a larger magnetic field intensity, and the generated strong magnetic field is used to attract and gather magnetic solid particles in the sewage. During the time period when the low-frequency pulsating excitation electromagnet 3 generates a smaller magnetic field, the driving source 23 drives the first auger 21 and the second auger 22 to rotate. In this way, the driving source 23, the first auger 21 and the second auger 22 have to overcome a smaller magnetic field force, which is conducive to transporting the magnetic solid particles attracted and gathered at the bottom of the cavity. Here, the driving source 23 can be connected to a pulse power supply, and the rhythm and frequency of the pulse power supply can be coordinated with the rhythm and frequency of the excitation current of the low-frequency pulsating excitation electromagnet 3 to achieve the above-mentioned effect. More preferably, within the half-cycle of the above-mentioned sinusoidal pulse current with lower current intensity, an interval with lower current intensity (e.g., the middle section within this half-cycle) can be selected to further reduce the magnetic field force exerted on the magnetic solid particles by the conveying component 2 during transportation, thereby facilitating solid-liquid separation of the wastewater.

[0043] The very low frequency AC output of the "AC-DC-AC" type inverter can be used to load a DC bias current and modulate it to provide a very low frequency pulsating excitation current of about 0.1Hz to 0.4Hz for the electromagnet.

[0044] Reference Figure 1-Figure 4 As shown, further, the separator body 1 includes a trough body 17 and a top cover 18, both ends of the trough body 17 are connected to end plates 19, and the top cover 18 is arranged at the open end of the trough body 17 to form the separator body 1. Specifically, the separator body 1 includes a trough body 17, both ends of the trough body 17 are connected to end plates 19, and positions on the end plates 19 corresponding to the main shafts of the first auger 21 and the second auger 22 are respectively provided with through holes for the main shafts of the first auger 21 and the second auger 22 to pass through, and differential pressure rotating stuffing seals for sealing are provided between the through holes and the main shafts of the first auger 21 and the second auger 22.

[0045] Furthermore, the cross-section of the trough body 17 is W-shaped, including two symmetrically arranged arc-shaped spaces extending along the length of the trough body 17, with the first auger 21 and the second auger 22 respectively disposed in the two arc-shaped spaces. Specifically, the cross-section of the trough body 17 is W-shaped, and the bottom of the inner side of the trough body 17 is two arc-shaped spaces extending parallel to its length. The shape of the arc-shaped spaces corresponds to the shape and size of the first auger 21 and the second auger 22. When the first auger 21 and the second auger 22 rotate, they can scrape off the magnetic solid particles that are attracted and gathered at the bottom of the arc-shaped spaces under the action of the magnetic field and transport them to the discharge port 16. The inner partition 11 is disposed on the center line of the trough body 17 along the length of the trough body 17 and is connected to the top cover 18 and the end plate 19, separating the spaces on both sides thereof to form the mutually symmetrical first cavity 12 and second cavity 13.

[0046] Furthermore, the low-frequency pulsating excitation electromagnet 3 is symmetrically provided with two arcuate grooves extending in its length direction. The shape of the arcuate grooves corresponds to the shape of the bottom surface of the groove body 17, and the groove body 17 is embedded in the arcuate grooves. It can be imagined that the bottom surface of the groove body 17 with a W-shaped cross section has a shape with two arcuate protrusions. Based on this shape feature of the groove body 17, the arcuate grooves corresponding to the arcuate protrusions are provided on the low-frequency pulsating excitation electromagnet 3. In this way, when the low-frequency pulsating excitation electromagnet 3 and the groove body 17 are installed together, the two can be combined more tightly and stably, and the air gap magnetic resistance is minimized to the greatest extent, ensuring that the solid-liquid separation process is stable and smooth.

[0047] Furthermore, both the sewage inlet 14 and the filtrate outlet 15 are located on the taller side of the separator body 1. Specifically, the sewage to be treated, which is input from the sewage inlet 14 at the taller end of the separator body 1, flows from the upper end of the first cavity 12 to the lower end due to hydrostatic pressure, and enters the second cavity 13 through the notch 111 of the inner partition 11 located near the lower end of the cavity. It then flows upward along the second cavity 13, and ultimately, the filtrate after solid-liquid separation is discharged from the device through the discharge port 16. It can be imagined that the location of the sewage inlet 14 on the taller side of the separator body 1 facilitates the entry of sewage into the separator body 1 and its passage from the first cavity 12 into the second cavity 13. Since magnetic solid particles in the sewage are deposited under the action of the magnetic field, the upper layer of liquid in the cavity after solid-liquid separation is purer. Therefore, the location of the filtrate outlet 15 on the taller side of the separator body 1 can better achieve the discharge and collection of the filtrate after solid-liquid separation.

[0048] Furthermore, the helical lines of the first auger 21 and the second auger 22 are in opposite directions. Specifically, the first auger 21 and the second auger 22 rotate synchronously in opposite directions under the drive source, and the first auger 21 and the second auger 22 are augers with opposite helical lines. When they rotate synchronously in opposite directions, the magnetic solid particles (solid waste) continuously separated from the bottom of the first cavity 12 and the second cavity 13 can be synchronously transported upward to the discharge port 16 for continuous discharge, thereby achieving the technical requirement of continuous solid-liquid separation.

[0049] Specifically, the first auger 21 can be right-handed, and the second auger 22 can be left-handed. It is conceivable that after the magnetic solid particles in the sewage are gathered at the bottom of the cavity of the separator body 1, the first auger 21 and the second auger 22 transport the gathered magnetic solid particles from bottom to top to the discharge port 16, and the first auger 21 and the second auger 22 will automatically mechanically scrape the magnetic separation working surface (i.e., the surface where the magnetic solid particles are deposited and gathered under the action of the magnetic field) during the transportation process, so that the magnetic resistance of the device will not increase, the magnetic adsorption filtration efficiency will not be greatly attenuated, and the device can maintain a long-term stable working state, reduce the number of shutdowns for maintenance, and reduce maintenance costs and production costs.

[0050] At the same time, it can be imagined that the solid-liquid separator of the present invention is not equipped with filter elements and fragile precision parts, which greatly reduces the labor maintenance cost and consumables consumption cost, and significantly reduces the daily shutdown maintenance work and shutdown inspection frequency, thereby significantly improving the production efficiency of the production line and the operational reliability of the solid-liquid separation, and is suitable for practical use.

[0051] Furthermore, it also includes a bracket 4, the separator body 1 is arranged on the bracket 4, the bracket 4 is connected to a support seat 41, the driving source 23 is arranged on the support seat 41, the output end of the driving source 23 is coaxially connected to one end of the first auger 21, the other end of the first auger 21 is coaxially connected to a driving gear 42, and one end of the second auger 22 is provided with a driven gear 43 used in conjunction with the driving gear 42, and the driving gear 42 is meshed with the driven gear 43.

[0052] Reference Figure 4 As shown, further, the highest liquid level A of the solid-liquid separator during operation is lower than the height of the discharge port 16 .

[0053] Furthermore, the driving source 23 can be a stepper motor, and the driving source 23 adopts a pulse power supply. Specifically, the output end of the stepper motor is connected to a cycloid pinwheel reducer and is coaxially connected to one end of the first auger 21 through a coupling. More preferably, in addition to being driven by a stepper motor, the solid-liquid separator can also be driven by a servo motor, an electromagnetic clutch motor or other types of motors that allow frequent load starting, such as a lifting motor; a continuous running motor with its own electromagnetic clutch can also be used. In this case, the motor can use an ordinary industrial frequency AC power supply, but an independent small-load pulse power supply must be provided to separately control the synchronous pulse coordinated action of the electromagnetic clutch of the above-mentioned electromagnetic clutch motor, so that it can be synchronized and coordinated with the excitation current of the aforementioned pulsating electromagnet.

[0054] Example 2

[0055] Reference Figure 6 As shown, based on the first embodiment, further, the low-frequency pulsating excitation electromagnet 3 can be excited by an asymmetric very low frequency square wave pulsating current. It can be imagined that the excitation current of the low-frequency pulsating excitation electromagnet 3 can not only adopt a sinusoidal pulsating current, but also can adopt an asymmetric very low frequency square wave pulsating current for excitation; but it is not limited to the above two excitation currents. It is only necessary to ensure that the excitation current of the electromagnet has a certain periodicity, and that there are regular high current intensity processes and low current intensity processes (corresponding to high magnetic field intensity processes and low magnetic field intensity processes) within one cycle of the excitation current; a controllable power thyristor solid-state switching circuit can be used to modulate two DC currents of different current magnitudes, thereby obtaining an asymmetric very low frequency square wave pulse excitation current that meets the requirements.

[0056] Obviously, the above embodiments are merely examples for clarity of explanation and are not intended to limit the implementation methods. Those skilled in the art will appreciate that other variations or modifications can be made based on the above description. It is not necessary and impossible to enumerate all implementation methods here. Obvious variations or modifications arising therefrom remain within the scope of protection of the present invention.

Claims

1. A solid-liquid separator, characterized in that: include, A separator body, the separator body including an internal cavity, an inner baffle extending in the longitudinal direction of the cavity being installed in the cavity, the inner baffle dividing the cavity into a first cavity and a second cavity, and the separator body being arranged at an angle, a notch being provided at the lower end of the inner baffle, the notch communicating with the first cavity and the second cavity, a sewage inlet and a filtrate outlet communicating with the first cavity and the second cavity being respectively provided on the side of the separator body, and a discharge port being provided at the bottom of the higher end of the separator body; A conveying assembly, the conveying assembly comprising a first auger, a second auger, and a drive source, the first auger and the second auger being respectively arranged to rotate in parallel in the first cavity and the second cavity, the drive source driving the first auger and the second auger to rotate synchronously in opposite directions; A low-frequency pulsating excitation electromagnet is installed on the separator body. The excitation current of the low-frequency pulsating excitation electromagnet is a periodic current, which includes a high-potential current in the first half of the cycle and a low-potential current in the second half of the cycle within one cycle. Only when the excitation current is in the low-potential half cycle, the driving source drives the first auger and the second auger to rotate.

2. The solid-liquid separator according to claim 1, characterized in that: The separator body includes a trough body and a top cover. Both ends of the trough body are connected with end plates. The top cover is arranged at the open end of the trough body to form the separator body.

3. The solid-liquid separator according to claim 2, characterized in that: The cross section of the trough body is W-shaped, and includes two arc-shaped spaces extending along the length direction of the trough body and symmetrical to each other. The first auger and the second auger are respectively arranged in the two arc-shaped spaces.

4. The solid-liquid separator according to claim 3, characterized in that: The low-frequency pulsating excitation electromagnet is symmetrically provided with two arc-shaped grooves extending in the length direction thereof. The shape of the arc-shaped grooves corresponds to the shape of the bottom surface of the groove body, and the groove body is embedded in the arc-shaped grooves.

5. The solid-liquid separator according to claim 1, characterized in that: The sewage inlet and the filtrate outlet are both opened on the side of the separator body with a higher height.

6. The solid-liquid separator according to claim 1, characterized in that: The spiral lines of the first auger and the second auger are in opposite directions.

7. The solid-liquid separator according to claim 1, characterized in that: It also includes a bracket, the separator body is arranged on the bracket, the bracket is connected to a support seat, the driving source is arranged on the support seat, the output end of the driving source is coaxially connected to one end of the first auger, the other end of the first auger is coaxially connected to a driving gear, and one end of the second auger is provided with a driven gear used in conjunction with the driving gear, and the driving gear is meshed with the driven gear.

8. The solid-liquid separator according to claim 1, characterized in that: The highest liquid level of the solid-liquid separator during operation is lower than the height of the discharge port.

9. The solid-liquid separator according to claim 1, characterized in that: The low-frequency pulsating excitation electromagnet can be excited by a sinusoidal pulsating current or an asymmetric very low-frequency square wave pulsating current.

10. The solid-liquid separator according to claim 1, characterized in that: The driving source may be a stepping motor, and the driving source adopts a pulse power supply.

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