An automatic magnetic solid-liquid separator with buried scraper conveying and continuous unloading

Abstract

The application relates to an automatic magnetic solid-liquid separator with continuous unloading of an en masse conveyor, which comprises a liquid sealing box, an en masse transmission device and a pulsating excitation electromagnet, the timing and frequency of en masse movement of the en masse transmission device are mutually synchronized and coordinated with the timing and frequency of magnetic field strength change of the pulsating excitation electromagnet, the en masse transmission device is stopped when the pulsating excitation electromagnet is in a high magnetic field strength half cycle, and the en masse transmission device is started when the pulsating excitation electromagnet is in a low magnetic field strength half cycle; the application introduces process fluid or industrial sewage containing magnetic solid particles into the liquid sealing box, absorbs the magnetic solid particles through the pulsating excitation electromagnet, realizes solid-liquid separation, and then discharges the absorbed magnetic solid particles through the en masse transmission device, so that not only the solid-liquid separation is realized, but also the liquid sealing box is cleaned in time.

Description

Technical Field

[0001] The invention relates to the technical field of magnetic solid-liquid separation equipment, in particular to an automatic magnetic solid-liquid separator with buried scraper conveying and continuous unloading. Background Art

[0002] In today's industrial production field, in industries such as ferromagnetic catalyst production and other ferromagnetic material production (physical metallurgy of ferromagnetic metal materials, ferromagnetic metal oxide pigments, stealth aircraft coatings, metal oxides for data memory, etc.), there are various ferromagnetic two-phase process fluids that require high-efficiency solid-liquid separation. In various industrial production lines, a large amount of industrial wastewater containing ferromagnetic tiny suspended solids will also be discharged. The ferromagnetic tiny suspended solids must be filtered out with a high-efficiency liquid filter before qualified solid products can be extracted, or these industrial wastewaters can be recycled repeatedly so that they can be discharged in compliance with national environmental protection technical standards.

[0003] Existing technologies use magnetic solid-liquid separators to achieve solid-liquid separation through magnetic adsorption. However, due to the limitations of the working principles and structural characteristics of various existing magnetic solid-liquid separators, their self-cleaning capabilities for filter elements vary. If the magnetic solid-liquid separator cannot immediately and thoroughly clean the outer surface of the ferromagnetic suspended solids it adsorbs, after long-term use, the adsorbed ferromagnetic suspended solids can easily accumulate on the outer surface, forming a colloidal solid layer that is difficult to rinse off. This layer gradually thickens and hardens, resulting in a significant additional magnetic resistance. This inherently disadvantages magnetic solid-liquid separators, resulting in a continuous decline in their actual filtration efficiency. Consequently, frequent downtime for manual inspection and cleaning is required. Otherwise, the filtration efficiency is greatly reduced, and in severe cases, the magnetic filter can even fail to function normally and stably. This not only results in high maintenance labor costs, but also frequently disrupts the operation rhythm of the automated production line, severely reducing the overall production efficiency of the entire plant.

[0004] In addition, the magnetic solid-liquid classifiers (magnetic filters) used in today's industrial fields all adopt an intermittent sewage discharge (unloading) working mode, which not only has low working efficiency, but also has a very complex and expensive control system, which is a very low cost-effective working mode. Summary of the Invention

[0005] To this end, the technical problem to be solved by the present invention is to overcome the problem in the prior art that the magnetic solid-liquid separator cannot be cleaned in time, resulting in the accumulation of a colloidal solid attachment layer on the adsorption surface after long-term use, causing increased magnetic resistance. An automatic magnetic solid-liquid separator with buried scraper conveyor and continuous unloading is provided. While unloading, the adsorption surface of the magnetic solid-liquid separation is automatically scraped clean to achieve the cleaning of the adsorption surface, thereby completely eliminating the problem of increased magnetic resistance caused by the accumulation of a colloidal solid attachment layer on the adsorption surface after long-term use, improving its actual solid-liquid separation work efficiency, significantly reducing the amount of pollution discharged, and facilitating the realization of a green and environmentally friendly production method. At the same time, we have also achieved continuous pollution discharge (unloading), thereby greatly improving the working efficiency of the magnetic solid-liquid classifier (magnetic filter).

[0006] In order to solve the above technical problems, the present invention provides an automatic magnetic solid-liquid separator with buried scraper conveying and continuous unloading, comprising:

[0007] A liquid sealing box body, wherein a liquid sealing flow channel is provided in the liquid sealing box body, and a liquid inlet, a liquid discharge port and a solid material discharge port are opened on the liquid sealing box body;

[0008] An embedded scraper transmission device is provided in the liquid-sealed box, the embedded scraper transmission device comprising a driving source and a conveying line driven by the driving source, wherein an embedded scraper is provided on the conveying line, the embedded scraper abuts against the inner wall of the liquid-sealed box, and the driving source drives the embedded scraper to move along the extension direction of the liquid-sealed flow channel;

[0009] a pulsating excitation electromagnet, disposed on the outside of the liquid-sealed box, capable of attracting magnetic material in the liquid-sealed flow channel to the inner wall of the liquid-sealed box;

[0010] Among them, the timing and frequency of the buried scraper transmission device driving the buried scraper to move are synchronized and coordinated with the timing and frequency of the change in strength of the magnetic field of the pulsating excitation electromagnet. When the pulsating excitation electromagnet is in a half-cycle of high magnetic field intensity, the buried scraper transmission device stops, and when the pulsating excitation electromagnet is in a half-cycle of low magnetic field intensity, the buried scraper transmission device starts.

[0011] In one embodiment of the present invention, the pulsating excitation electromagnet is excited by a very low frequency pulsating excitation current, and the very low frequency pulsating excitation current continuously excites the pulsating excitation electromagnet in a pulsating manner, so that the pulsating excitation electromagnet always has a magnetic field with a constantly changing magnetic field strength. The magnetic field strength of the pulsating excitation electromagnet is proportional to the magnitude of the very low frequency pulsating excitation current. By adjusting the magnitude of the very low frequency pulsating excitation current, the magnitude of the pulsating magnetic field strength of the excitation electromagnet will be changed.

[0012] In one embodiment of the present invention, the very low frequency pulsating excitation current includes a sinusoidal pulsating current and a square wave pulsating current.

[0013] In one embodiment of the present invention, the frequency of the very low frequency pulsating excitation current is 0.1-0.4 Hz.

[0014] In one embodiment of the present invention, the conveyor line includes a driving sprocket and a tensioning sprocket, two parallel traction chains are provided on the outer shells of the driving sprocket and the tensioning sprocket, and the buried scraper is arranged between the two traction chains.

[0015] In one embodiment of the present invention, the conveyor line further comprises a roller arranged between the two traction chains, both ends of the roller protrude from the traction chains, and an internal guide track for limiting the movement of the roller is provided on the liquid-sealed box.

[0016] In one embodiment of the present invention, it further comprises:

[0017] An equipment bracket, supporting the liquid sealing box;

[0018] The track outer bracket is arranged outside the liquid-tight box body, the track outer bracket is arranged corresponding to the internal guide track, and the track outer bracket is connected to the equipment bracket.

[0019] In one embodiment of the present invention, the driving sprocket and the tensioning sprocket both pass through the liquid-sealed box via a central rotating shaft, and a sealing box is provided at a position where the central rotating shaft passes through the liquid-sealed box.

[0020] In one embodiment of the present invention, an inspection door is further provided on the liquid-tight box body, and the inspection door is correspondingly provided at the position where the driving sprocket and the tensioning sprocket are provided.

[0021] In one embodiment of the present invention, the liquid sealing box includes a straight section and an upward curved section, the liquid inlet and the liquid outlet are arranged in the straight section, and the solid material discharge port is arranged in the upward curved section.

[0022] The above technical solution of the present invention has the following advantages over the prior art:

[0023] The automatic magnetic solid-liquid separator with buried scraper conveying and continuous unloading described in the present invention is provided with a pulsating excitation electromagnet that can adsorb magnetic substances in the liquid sealed flow channel to the inner wall of the liquid sealed box, thereby achieving solid-liquid separation of the liquid. It is suitable for filtering and treating various process media containing ferromagnetic solid suspended particles or industrial wastewater containing tiny ferromagnetic suspended solids discharged from various industrial production lines, so as to achieve efficient solid-liquid separation, or directly recycle the filtrate (filtered wastewater), or achieve environmentally friendly discharge of related industrial wastewater, thereby facilitating the realization of a green and environmentally friendly production method; a buried scraper transmission device is provided, which can automatically scrape the adsorption surface of the magnetic solid-liquid separation while the buried scraper conveys and unloads, thereby achieving permanent self-cleaning of the adsorption surface, thereby completely eliminating the inherent technical disadvantages of the existing magnetic solid-liquid separator that with the increase of cumulative filtration time, a large amount of colloidal attachments will adhere and stick to the adsorption surface, and the adsorption surface will continue to harden and thicken, thereby causing the magnetic resistance to continue to increase and the magnetic adsorption filtration efficiency to continue to decay, so that the machine often needs to be stopped for manual disassembly and cleaning, and it is impossible to work stably for a long time;

[0024] Furthermore, in the automatic magnetic solid-liquid separator with buried scraper conveying and continuous unloading of the present invention, in order to make the adsorption action of the pulsating excitation electromagnet and the scraping action of the buried scraper transmission device work in coordination and not affect each other, the buried scraper transmission device is provided to drive the buried scraper to move in a synchronous and coordinated manner with the timing and frequency of the change in the strength of the pulsating excitation electromagnet magnetic field. When the pulsating excitation electromagnet is in a half-cycle of high magnetic field intensity, the buried scraper transmission device stops. At this time, a large amount of magnetic solid particles carried in the solid-liquid two-phase fluid medium flowing inside the liquid-sealed flow channel are separated from the solid and liquid and magnetically aggregated on the inner wall of the liquid-sealed box. When the pulsating excitation electromagnet is in a half-cycle of low magnetic field intensity, the buried scraper transmission device is opened, and the large amount of magnetic solid particles magnetically aggregated on the inner wall of the liquid-sealed box are conveyed forward in steps by the buried scraper along the extension direction of the liquid-sealed box.

[0025] To sum up, the automatic magnetic solid-liquid separator with buried scraper conveying and continuous unloading of the present invention can improve its actual solid-liquid separation efficiency, realize the advanced working mode of efficient continuous unloading, and can significantly reduce the amount of sewage discharged, greatly reduce the labor maintenance cost and the consumption cost of filter bag replacement consumables, and greatly reduce the daily shutdown, disassembly, maintenance and maintenance workload and the frequency of shutdown inspections, thereby improving the production efficiency of the production line and greatly reducing labor consumption, and improving the overall operation reliability of the solid-liquid separator. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] 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

[0027] Figure 1 This is a schematic diagram of the overall structure of the automatic magnetic solid-liquid separator with buried scraper conveying and continuous unloading according to the present invention;

[0028] Figure 2 It is a schematic diagram of the internal cross-sectional structure of the automatic magnetic solid-liquid separator with buried scraper conveying and continuous unloading of the present invention;

[0029] Figure 3 This is a schematic diagram of the rhythmic relationship between the driving action of the driving source and the pulsating excitation electromagnet excited by the sinusoidal pulsating current of the present invention;

[0030] Figure 4 This is a schematic diagram of the rhythmic relationship between the driving action of the driving source and the square wave pulsating current used to excite the pulsating excitation electromagnet of the present invention;

[0031] Figure 5 It is a structural schematic diagram of the straight section of the liquid sealing box of the present invention;

[0032] Figure 6 It is a structural schematic diagram of the upward curved section of the liquid-tight box body of the present invention.

[0033] Explanation of the reference numerals in the accompanying drawings in the specification: 1. Liquid sealing box; 11. Liquid inlet; 12. Liquid discharge port; 13. Solid material discharge port; 14. Inspection door; 2. Buried scraper transmission device; 21. Driving source; 22. Conveyor line; 221. Driving sprocket; 222. Tensioning sprocket; 223. Traction chain; 23. Buried scraper; 24. Roller; 25. Internal guide rail; 3. Pulsating excitation electromagnet; 4. Equipment bracket; 5. Track outer bracket. DETAILED DESCRIPTION

[0034] 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.

[0035] Reference Figure 1 and Figure 2As shown, the present invention discloses an automatic magnetic solid-liquid separator with buried scraper conveying and continuous unloading, comprising: a liquid sealing box 1, a buried scraper transmission device 2 and a pulsating excitation electromagnet 3; wherein: a liquid sealing flow channel is provided in the liquid sealing box 1, and a liquid inlet 11, a liquid outlet 12 and a solid material discharge port 13 are provided on the liquid sealing box 1. In the liquid sealing flow channel, the liquid introduced flows into the liquid inlet 11 and flows out from the liquid outlet 12 under the action of static pressure. Specifically, industrial sewage (industrial sewage) containing tiny suspended solids is introduced into the liquid inlet 11. Industry medium), the filtered clean water is discharged from the drain port 12, and the adsorbed solid suspended matter is discharged from the solid material discharge port 13; the buried scraper transmission device 2 is arranged in the liquid sealing box 1, and the buried scraper transmission device 2 includes a driving source 21 and a conveying line 22 driven by the driving source 21, the conveying line 22 is arranged along the extension direction of the liquid sealing flow channel through the liquid sealing flow channel, and a buried scraper 23 is arranged on the conveying line 22, the buried scraper 23 abuts against the inner wall of the liquid sealing box 1, and the driving source 21 drives the buried scraper 23 Move along the extension direction of the liquid sealing flow channel; the pulsating excitation electromagnet 3 is arranged on the outside of the liquid sealing box 1, and the magnetic material in the liquid sealing flow channel is first adsorbed to the inner wall of the liquid sealing box 1 by the pulsating excitation electromagnet 3 to realize the solid-liquid separation of the liquid, which is suitable for filtering various process media containing ferromagnetic solid suspended particles or industrial wastewater containing tiny ferromagnetic suspended solids discharged by various industrial production lines, so as to achieve efficient solid-liquid separation, or directly recycle the filtrate (filtered wastewater), or realize the relevant industrial wastewater. Environmentally friendly emissions meet standards, which is conducive to achieving a green and environmentally friendly production method. When the buried scraper transmission device 2 is used, the buried scraper 23 can automatically scrape the adsorption surface of the magnetic solid-liquid separation while transporting and unloading, thereby cleaning the adsorption surface. This completely eliminates the existing technical disadvantages of the existing magnetic solid-liquid separator that with the increase of cumulative filtration time, a large amount of colloidal attachments will be attached and adhered to the adsorption surface, and will continue to harden and thicken, thereby causing the magnetic resistance to continue to increase and the magnetic adsorption filtration efficiency to continue to decline, so that it is often necessary to stop the machine for manual disassembly and cleaning, and it is impossible to work stably for a long time.

[0036] Specifically, in this embodiment, the timing and frequency of the buried scraper transmission device 2 driving the buried scraper 23 to move are synchronized and coordinated with the timing and frequency of the change in the strength of the magnetic field of the pulsating excitation electromagnet 3, so as to realize the coordination of the scraping action of the buried scraper transmission device 2 and the adsorption action of the pulsating excitation electromagnet 3. When the pulsating excitation electromagnet 3 is in a half-cycle of high magnetic field intensity, the buried scraper transmission device 2 stops. At this time, a large amount of magnetic solid particles carried in the solid-liquid two-phase fluid medium flowing inside the liquid sealed flow channel are separated from the solid and liquid and magnetically aggregated on the inner wall of the liquid sealed box 1. When the pulsating excitation electromagnet 3 is in a half-cycle of low magnetic field intensity, the buried scraper transmission device 2 is turned on, and the large amount of magnetic solid particles magnetically aggregated on the inner wall of the liquid sealed box 1 are pushed by the buried scraper 23 to be transported forward in steps along the extension direction of the liquid sealed box 1.

[0037] Reference Figure 3 and Figure 4 As shown, in order to achieve the control of the strength of the magnetic field of the pulsating excitation electromagnet 3, the present invention adopts a very low frequency pulsating excitation current to excite the pulsating excitation electromagnet 3. The magnetic field strength of the pulsating excitation electromagnet 3 is proportional to the magnitude of the very low frequency pulsating excitation current. By adjusting the magnitude of the very low frequency pulsating excitation current, the magnitude of the magnetic field strength of the excitation electromagnet can be changed.

[0038] In this embodiment, two excitation methods are adopted. The very low frequency pulsating excitation current includes sinusoidal pulsating current and square wave pulsating current. The sinusoidal pulsating current can utilize the very low frequency AC output of the "AC-DC-AC" type inverter, and the square wave pulsating current can use the thyristor power thyristor solid-state switching circuit to modulate two DC currents with different current sizes. The frequency of the very low frequency pulsating excitation current output by the sinusoidal pulsating current and the square wave pulsating current is 0.1~0.4Hz.

[0039] In this embodiment, the very low frequency pulsating excitation current continuously excites the pulsating excitation electromagnet 3, so that the pulsating excitation electromagnet 3 always has magnetism with constantly changing magnetic field strength. Even when the buried scraper transmission device 2 drives the buried scraper 23 to step forward along the bottom inner surface of the liquid sealed flow channel to transport the magnetic solid particles that have been separated from the solid and liquid, the pulsating excitation electromagnet 3 is still in the working half cycle of low magnetic field strength, but has not completely lost its magnetism; this ensures that the magnetic solid particles adsorbed during the transportation process must still be in a moderately tight magnetic aggregation state, and under the scraping of the buried scraper 23, they always step forward in a tight mass along the inner wall of the liquid sealed box 1, so that they will never be redispersed into the liquid medium.

[0040] Specifically, refer to Figure 1As shown, in this embodiment, the liquid sealing box body 1 is provided with a straight section and an upward curved section, the buried scraper transmission device 2 also has a straight section and an upward curved section, the liquid inlet 11 and the liquid discharge port 12 are provided in the straight section, and the solid material discharge port 13 is provided in the upward curved section. Specifically, the pulsating excitation electromagnet 3 is provided at the bottom of the liquid sealing box body 1, the liquid inlet 11 and the liquid discharge port 12 are both opened upward, and the solid material discharge port 13 is provided higher than the liquid inlet 11 and the liquid discharge port 12. A large amount of filtered liquid after solid-liquid separation is discharged out of the equipment by gravity through the liquid discharge port 12 by relying on the static pressure of the fluid. Due to the limitation of the height of the actual position of the liquid discharge port 12, the height of the solid material discharge port 13 is automatically limited. The highest working liquid level that the solid-liquid two-phase working medium can reach in the entire liquid sealed flow channel will never submerge the upward curved section; therefore, when the buried scraper transmission device 2 drives the buried scraper 23 to further scrape the inner wall of the liquid sealed box 1 and transport the magnetic solid particles that have been separated from the solid and liquid, when it reaches the upward curved section of the liquid sealed box 1, the buried scraper 23 will exceed the highest working liquid level surface of the liquid, and only transport the magnetic solid particles that are always in a magnetic agglomerate state to the outside of the liquid medium. The magnetic aggregate agglomerates of wet solid ferromagnetic particles containing water are simply transported upward along the inner wall of the upward curved section of the rectangular liquid sealed box 1 until they are transported to the solid material discharge port 13 and discharged outside the equipment.

[0041] In this embodiment, the conveyor line 22 includes a driving sprocket 221 and a tensioning sprocket 222. Figure 5 and Figure 6 As shown, the driving sprocket 221 is arranged on the upward curved section of the liquid-sealed box body 1, and the tensioning sprocket 222 is arranged on the straight section of the liquid-sealed box body 1. Two parallel traction chains 223 are provided on the outer sleeves of the driving sprocket 221 and the tensioning sprocket 222, and the buried scraper 23 is arranged between the two traction chains 223. These buried scrapers 23 are not only used to transport the ferromagnetic solid materials continuously separated from the inner wall of the liquid-sealed box body 1, but also connect the two traction chains 223 into a synchronously moving whole, thereby further increasing the smoothness of operation and strengthening the structural strength.

[0042] Specifically, the driving source 21 drives the active sprocket 221 to rotate. The driving source 21 includes a gear reducer and an electromagnetic clutch motor. In other embodiments, the driving source 21 can also be a stepper motor, a servo motor, or a lifting motor that allows frequent load starting.

[0043] Specifically, the driving sprocket 221 and the tensioning sprocket 222 both pass through the liquid sealing box 1 through a central rotating shaft, and a sealing box is provided at the exit position of the central rotating shaft relative to the liquid sealing box 1. In this embodiment, the tensioning sprocket 222 is arranged in a straight section, and the tensioning sprocket 222 is in a liquid medium, so the central rotating shaft of the tensioning sprocket 222 is arranged to pass through the two side walls of the liquid sealing box 1 through a "differential pressure rotating stuffing sealing box", and the driving sprocket 221 is arranged in an upward curved section, and the material is discharged near the driving sprocket 221, so the central rotating shaft of the driving sprocket 221 is arranged to pass through the two side walls of the liquid sealing box 1 through a "felt dustproof sealing box".

[0044] Specifically, an inspection door 14 is further provided on the liquid-tight box body 1 , and the inspection door 14 is correspondingly provided at the position where the driving sprocket 221 and the tensioning sprocket 222 are provided.

[0045] Specifically, the conveyor line 22 also includes a roller arranged between the two traction chains 223. Along the extension direction of the traction chain 223, a roller 24 is provided at a certain distance at each interval. The two ends of the roller 24 protrude from the traction chain 223. An internal guide track 25 of the roller 24 is provided on the liquid sealing box 1 to limit the movement of the roller 24. According to the setting of the liquid sealing box 1, the internal guide track 25 also includes a straight section and an upward curved section. When the overall conveying length of the conveyor line 22 is long, in order to In order to ensure the smooth and reliable operation of the device, a group of internal guide rails 25 are set every 10 to 15 meters inside the liquid-sealed box 1 of the longer straight section of the conveyor line 22. At the internal guide rails 25, not only the downward freedom of the roller 24 on the transmission chain is limited, but also its upward freedom is limited, leaving only a single degree of freedom along the forward direction of the conveyor chain; a similar curved internal guide rail 25 is also provided inside the upward curved section of the conveyor line 22 to ensure the smooth and reliable operation of the conveyor chain in the curved section.

[0046] The roller 24 of the liquid-sealed box 1 limits the moving direction of the roller 24 through the guide track 25 inside the roller 24, thereby limiting the transmission direction of the traction chain 223, ensuring that the traction chain 223 can run smoothly and turn upward smoothly.

[0047] In this embodiment, the entire separator is supported on a concrete equipment foundation by multiple sets of equipment brackets 4 arranged at intervals and a track outer bracket 5 installed on the outer wall of the liquid-tight box body 1;

[0048] Specifically, the track outer bracket 5 is connected to the equipment bracket 4, and the track outer bracket 5 is aligned with the internal guide track 25 of the roller 24 welded on the two side walls inside the liquid-sealed box 1. The provision of the track outer bracket 5 realizes the transfer between the equipment bracket 4 and the liquid-sealed box 1, and can also play a structural reinforcement role for the internal guide track 25 of the roller 24.

[0049] 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. An automatic magnetic solid-liquid separator with buried scraper conveying and continuous unloading, characterized in that: include: A liquid sealing box body, wherein a liquid sealing flow channel is provided in the liquid sealing box body, and a liquid inlet, a liquid discharge port and a solid material discharge port are opened on the liquid sealing box body; An embedded scraper transmission device is provided in the liquid-sealed box, the embedded scraper transmission device comprising a driving source and a conveying line driven by the driving source, wherein an embedded scraper is provided on the conveying line, the embedded scraper abuts against the inner wall of the liquid-sealed box, and the driving source drives the embedded scraper to move along the extension direction of the liquid-sealed flow channel; a pulsating excitation electromagnet, disposed on the outside of the liquid-sealed box, capable of attracting magnetic material in the liquid-sealed flow channel to the inner wall of the liquid-sealed box; Among them, the timing and frequency of the buried scraper transmission device driving the buried scraper to move are synchronized and coordinated with the timing and frequency of the change in strength of the magnetic field of the pulsating excitation electromagnet. When the pulsating excitation electromagnet is in a half-cycle of high magnetic field intensity, the buried scraper transmission device stops, and when the pulsating excitation electromagnet is in a half-cycle of low magnetic field intensity, the buried scraper transmission device starts.

2. The automatic magnetic solid-liquid separator with buried scraper conveying and continuous unloading according to claim 1 is characterized in that: The pulsating excitation electromagnet is excited by a very low frequency pulsating excitation current. The very low frequency pulsating excitation current continuously excites the pulsating excitation electromagnet in a pulsating manner, so that the pulsating excitation electromagnet always has a magnetic field with a constantly changing magnetic field strength. The magnetic field strength of the pulsating excitation electromagnet is proportional to the magnitude of the very low frequency pulsating excitation current. By adjusting the magnitude of the very low frequency pulsating excitation current, the magnitude of the pulsating magnetic field strength of the excitation electromagnet will be changed.

3. The automatic magnetic solid-liquid separator with buried scraper conveying and continuous unloading according to claim 2 is characterized in that: The very low frequency pulsating excitation current includes a sinusoidal pulsating current and a square wave pulsating current.

4. The automatic magnetic solid-liquid separator with buried scraper conveying and continuous unloading according to claim 2 is characterized in that: The frequency of the very low frequency pulsating excitation current is 0.1-0.4 Hz.

5. The automatic magnetic solid-liquid separator with buried scraper conveying and continuous unloading according to claim 1 is characterized in that: The conveying line includes a driving sprocket and a tensioning sprocket. Two parallel traction chains are arranged on the outer shells of the driving sprocket and the tensioning sprocket. The buried scraper is arranged between the two traction chains.

6. The automatic magnetic solid-liquid separator with buried scraper conveying and continuous unloading according to claim 5 is characterized in that: The conveyor line further comprises a roller arranged between the two traction chains, with both ends of the roller protruding from the traction chains, and an internal guide track for limiting the movement of the roller is provided on the liquid-sealed box.

7. The automatic magnetic solid-liquid separator with buried scraper conveying and continuous unloading according to claim 6 is characterized in that: Also includes: An equipment bracket, supporting the liquid sealing box; The track outer bracket is arranged outside the liquid-tight box body, the track outer bracket is arranged corresponding to the internal guide track, and the track outer bracket is connected to the equipment bracket.

8. The automatic magnetic solid-liquid separator with buried scraper conveying and continuous unloading according to claim 5, characterized in that: The driving sprocket and the tensioning sprocket both pass through the liquid sealing box via a central rotating shaft, and a sealing box is provided at a position where the central rotating shaft passes through the liquid sealing box.

9. The automatic magnetic solid-liquid separator with buried scraper conveying and continuous unloading according to claim 5, characterized in that: An inspection door is also provided on the liquid sealing box body, and the inspection door is correspondingly provided at the position where the driving sprocket and the tensioning sprocket are provided.

10. The automatic magnetic solid-liquid separator with buried scraper conveying and continuous unloading according to claim 1, characterized in that: The liquid sealing box includes a straight section and an upward curved section. The liquid inlet and the liquid outlet are arranged in the straight section, and the solid material discharge port is arranged in the upward curved section.

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