An on-line heavy impurity removal device

Abstract

The present application relates to a kind of online heavy impurities removal devices, sand collecting pit is opened in tank bottom wall, and first cyclone tank is arranged, first cleaning tank is arranged in the bottom of first cyclone tank, heavy impurities in sand collecting pit is extracted by separation pump, is sprayed into first cyclone tank by first input pipe, is separated at high speed in first cyclone tank, sand and other heavy impurities are sunk into first sand collecting area, organic matter and other are separated to the top of first cyclone tank and enter tank for purification treatment by third separation pipe;Second electromagnetic valve is opened, and the sand and other heavy impurities precipitated in first sand collecting area flow into first cleaning tank, tank purification effluent is pumped into first cleaning tank by cleaning pump, and sand and other heavy impurities are cleaned, after cleaning, sand and other heavy impurities are discharged from first impurity outlet, heavy impurities in tank are extracted in time online, avoid the harm caused by heavy impurities precipitation to tank, prolong the service life of tank, avoid the treatment of deposit for opening tank maintenance cleaning, reduce processing cost.

Description

Technical Field

[0001] This invention relates to the field of waste treatment technology, specifically to an online heavy impurity removal device. Background Technology

[0002] After sorting, the organic matter content of kitchen waste gradually increases. To handle this type of waste, a "pretreatment + anaerobic fermentation" technical approach is typically adopted. This method utilizes microorganisms in nature to metabolize and produce clean energy—biogas—achieving the harmless treatment and resource utilization of urban organic solid waste.

[0003] However, during the pretreatment of organic waste such as kitchen waste, a large amount of inorganic impurities enter the storage tank and anaerobic digester after being crushed. Because these tanks have a large volume (for example, the volume of an anaerobic digester is generally around 5000 m³),... 3 Up to 10000m 3 During the process (between stages), the stirring rate inside the tank is low, making it impossible to suspend heavy inorganic impurities in the liquid. As organic materials are converted into biogas, the relative proportion of inorganic impurities gradually increases. These impurities slowly deposit at the bottom of the tank, reducing its service life and potentially even rendering the storage tank or anaerobic digester unusable. These sediments also affect the stable operation of the entire system, requiring regular tank opening for maintenance and cleaning. However, cleaning sediments is a challenging task, requiring production shutdowns and increasing maintenance costs. Furthermore, the subsequent treatment of the sediments presents significant difficulties. Summary of the Invention

[0004] Therefore, the present invention provides an online heavy impurity removal device, which mainly solves the technical problem that the heavy impurities in the storage tanks and anaerobic fermentation tanks of the prior art cannot be removed in time, resulting in tank scrapping, increased processing costs due to opening the tank for maintenance and cleaning of sediment, and great difficulties in the subsequent treatment of sediment.

[0005] To achieve the above objectives, the present invention provides the following technical solution:

[0006] An online heavy impurity removal device includes a tank; a stirring shaft is rotatably mounted axially inside the tank; a purified liquid outlet communicating with the tank is located at the top of the tank; and an impurity removal unit is also included; a sand collection pit is formed on the bottom wall of the tank; the impurity removal unit includes a first cyclone tank and a first cleaning tank connected to the bottom of the first cyclone tank; a second solenoid valve is provided at the connection between the first cyclone tank and the first cleaning tank; the upper part of the first cyclone tank is cylindrical, and the lower part is conical; the upper side of the lower conical part of the first cyclone tank is provided with a first input pipe communicating with its interior, and the lower side is a first sand collection area; the upper side of the first cleaning tank is provided with a first outlet communicating with its interior, and the lower side is provided with a first inlet communicating with its interior. The first cleaning tank has a first impurity outlet at its bottom; a fourth solenoid valve is provided between the first cleaning tank and the first impurity outlet; the sand collection pit is connected to one end of the first separation pipe, and the other end of the first separation pipe passes through the side wall of the tank and is connected to the first input pipe; the first separation pipe is equipped with a separation pump; the top of the first cyclone tank is equipped with a third separation pipe connected to its interior; the end of the third separation pipe away from the first cyclone tank is connected to the interior of the tank; the purified liquid outlet is equipped with a purified liquid output pipe; the purified liquid output pipe is connected to the first inlet through the first cleaning pipe; the first cleaning pipe is equipped with a cleaning pump; the first outlet is connected to the purified liquid output pipe through the sixth cleaning pipe.

[0007] Preferably, the bottom wall of the tank body slopes downward toward the center of the sand collection pit.

[0008] Preferably, the sand collection pit is located directly below the stirring shaft; the stirring shaft is equipped with a scraper for scraping away heavy impurities such as sand and gravel deposited on the bottom wall of the tank.

[0009] Preferably, it further includes a second cleaning pipe, a third cleaning pipe, a fourth cleaning pipe, a fifth cleaning pipe, a second cyclone tank, and a second cleaning tank connected to the bottom of the second cyclone tank; a third solenoid valve is provided at the connection between the second cyclone tank and the second cleaning tank; the upper part of the second cyclone tank is cylindrical, and the lower part is conical; the upper side of the lower part of the conical tube of the second cyclone tank is provided with a second input pipe communicating with its interior, and the lower side is a second sand collection area; the upper side of the second cleaning tank is provided with a second outlet communicating with its interior, and the lower side is provided with a second inlet communicating with its interior; the bottom of the second cleaning tank is provided with a second impurity outlet; a fifth solenoid valve is provided between the second cleaning tank and the second impurity outlet; the other end of the first separation pipe is connected to... The second input pipe is connected; the top of the second cyclone tank is provided with a second separation pipe that communicates with its interior; the end of the second separation pipe away from the second cyclone tank is connected to the first input pipe; one end of the second cleaning pipe is connected to the first inlet; one end of the third cleaning pipe is connected to the second inlet; the other ends of the second and third cleaning pipes are both connected to the first cleaning pipe; the second cleaning pipe is provided with an eighth solenoid valve; the third cleaning pipe is provided with a ninth solenoid valve; one end of the fourth cleaning pipe is connected to the first outlet; one end of the fifth cleaning pipe is connected to the second outlet; the other ends of the fourth and fifth cleaning pipes are both connected to the sixth cleaning pipe.

[0010] Preferably, it further includes a feeding cylinder; a spiral feeding rod is rotatably provided inside the feeding cylinder along its axial direction; the spiral feeding rod is located directly below the first and second impurity outlets; the feeding cylinder has inlet holes corresponding to the first and second impurity outlets, for heavy impurities such as sand and gravel from the first and second impurity outlets to fall into the spiral feeding rod; the feeding cylinder has a sand outlet; the feeding cylinder also has a motor; the output shaft of the motor is connected to the spiral feeding rod, driving the spiral feeding rod to rotate.

[0011] Preferably, it further includes a sand storage box; the bottom wall of the sand storage box is inclined; the feeding cylinder is disposed outside the sand storage box and parallel to the bottom wall of the sand storage box; the bottom of the spiral feeding rod can move through the side wall of the sand storage box and extend into the sand storage box; the first waste outlet at the end away from the first washing tank and the second waste outlet at the end away from the second washing tank are both connected to the inside of the sand storage box.

[0012] Preferably, the sand storage tank has a drain outlet communicating with its interior.

[0013] Preferably, the first sand collection area is provided with a first observation window at the top; the second sand collection area is provided with a second observation window at the top.

[0014] Preferably, the upper part of the first cleaning tank is inverted conical and the lower part is cylindrical; the first inlet is located at the bottom of the cylindrical part of the first cleaning tank; the first outlet is located at the top of the inverted conical part of the first cleaning tank; the upper part of the second cleaning tank is inverted conical and the lower part is cylindrical; the second inlet is located at the bottom of the cylindrical part of the second cleaning tank; the second outlet is located at the top of the inverted conical part of the second cleaning tank.

[0015] Preferably, the volume of the first cleaning tank is at least twice the volume of the first sand collection area; and the volume of the second cleaning tank is at least twice the volume of the second sand collection area.

[0016] Preferably, the first separation pipe between the tank and the separation pump is equipped with a first solenoid valve; the third separation pipe is equipped with a tenth solenoid valve; the first cleaning pipe is equipped with a sixth solenoid valve; and the sixth cleaning pipe is equipped with a seventh solenoid valve.

[0017] The present invention has at least the following beneficial effects:

[0018] A sand collection pit is opened on the bottom wall of the tank, and a first cyclone tank is set up. A first cleaning tank is set up at the bottom of the first cyclone tank. Heavy impurities in the sand collection pit are drawn out by the separation pump and sprayed into the first cyclone tank through the first input pipe. They are separated by high-speed rotation in the first cyclone tank. Heavy impurities such as sand and gravel are settled into the first sand collection area, while organic matter is separated to the top of the first cyclone tank and enters the tank through the third separation pipe for purification treatment. Then, the second solenoid valve is opened to let the heavy impurities such as sand and gravel settled in the first sand collection area flow into the first cleaning tank. The cleaning pump draws the purified water from the tank into the first cleaning tank to clean the heavy impurities such as sand and gravel. After cleaning, the heavy impurities such as sand and gravel are discharged from the first impurity outlet.

[0019] Therefore, the online heavy impurity removal device of the present invention has at least the following advantages:

[0020] 1) By setting up a sand collection pit to collect heavy impurities, and further designing the bottom wall of the tank to be inclined, and installing a scraper on the stirring shaft, as the stirring shaft rotates, the heavy impurities deposited at the bottom of the tank are pushed by the scraper and fall into the sand collection pit at the bottom. They are then pumped out by the separation pump for separation and cleaning, which completely avoids the damage caused by the accumulation of heavy impurities at the bottom of the tank and extends the service life of the tank. At the same time, the removal of heavy impurities is carried out online during production, without the need to stop production and open the tank for removal, which improves work efficiency and avoids the subsequent treatment problems caused by sediment.

[0021] 2) Heavy impurities are injected into the first cyclone tank by the separation pump, forming a high-speed cyclone in the first cyclone tank. Under the action of the cyclone, the heavy impurities are settled to the first sand collection area, while the lighter organic matter floats to the top of the first cyclone tank, thus achieving the separation of heavy impurities such as sand and gravel. The separated lighter organic matter is sent into the tank for purification, while the heavy impurities such as sand and gravel are transported to the first cleaning tank for cleaning instead of being directly discharged, thus protecting the environment.

[0022] 3) Heavy impurities such as sand and gravel are cleaned in the first cleaning tank. The cleaning solution is the water discharged after the tank is purified, and no external water is used. This will not increase the load on the overall treatment process and will save water resources. Attached Figure Description

[0023] To more clearly illustrate the prior art and the present invention, the accompanying drawings used in the description of the prior art and the embodiments of the present invention will be briefly introduced below. Obviously, the drawings described below are merely exemplary, and those skilled in the art can derive other drawings from the provided drawings without any creative effort.

[0024] The structures, proportions, sizes, etc. illustrated in this specification are only for the purpose of assisting those skilled in the art in understanding and reading the content disclosed herein, and are not intended to limit the conditions under which the present invention can be implemented. Any modifications to the structure, changes in the proportions, or adjustments to the size, without affecting the effects and objectives that the present invention can produce, should still fall within the scope of the technical content disclosed herein.

[0025] Figure 1 This is a schematic diagram of the structural composition of an online heavy impurity removal device according to the present invention;

[0026] Figure 2 This is a schematic diagram of the structure of the impurity removal unit in an online heavy impurity removal device according to the present invention;

[0027] Figure 3 This invention provides an online heavy impurity removal device. Figure 2 A magnified view of part A;

[0028] Explanation of reference numerals in the attached figures:

[0029] 1. Tank body; 101. Agitator shaft; 102. Scraper blade; 103. Sand collection pit; 104. Bottom wall; 105. Purified liquid outlet; 2. First cyclone tank; 201. First sand collection area; 202. First input pipe; 203. First observation window; 3. Second cyclone tank; 301. Second sand collection area; 302. Second input pipe; 303. Second observation window; 4. First cleaning tank; 401. First inlet; 402. First outlet; 5. Second cleaning tank; 501. Second inlet; 502. Second outlet; 6. Sand storage tank; 601. Drain outlet; 7. Screw feeder; 8. Sand outlet 9. Motor; 10. Separator pump; 11. Cleaning pump; 12. First separation pipe; 13. Second separation pipe; 14. Third separation pipe; 15. Purified liquid output pipe; 16. First cleaning pipe; 17. Second cleaning pipe; 18. Third cleaning pipe; 19. Fourth cleaning pipe; 20. Fifth cleaning pipe; 21. Sixth cleaning pipe; 22. First solenoid valve; 23. Second solenoid valve; 24. Third solenoid valve; 25. Fourth solenoid valve; 26. Fifth solenoid valve; 27. Sixth solenoid valve; 28. Seventh solenoid valve; 29. ​​Eighth solenoid valve; 30. Ninth solenoid valve; 31. Tenth solenoid valve. Detailed Implementation

[0030] The present application will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0031] In the description of this application: unless otherwise stated, "a plurality of" means two or more. The terms "first," "second," "third," etc., in this application are intended to distinguish the objects referred to and do not have any special meaning in terms of technical connotation (e.g., they should not be construed as an emphasis on importance or order). Expressions such as "comprising," "including," and "having" also mean "not limited to" (certain units, components, materials, steps, etc.).

[0032] The terms used in this application, such as "upper," "lower," "left," "right," and "middle," are generally used to facilitate intuitive understanding by referring to the accompanying drawings, and are not absolute limitations on the positional relationships in the actual product. Changes in these relative positional relationships, without departing from the technical concept disclosed in this application, should also be considered within the scope of this application.

[0033] An online heavy impurity removal device of the present invention, such as Figures 1 to 3As shown, it includes a tank body 1, a stirring shaft 101 that is rotatably mounted inside the tank body 1 along the axial direction, and a purified liquid outlet 105 that communicates with the tank body 1 at the top. This is prior art and will not be described in detail here. To promptly remove heavy impurities and prevent their sedimentation from causing difficulties in subsequent processing, an impurity removal unit is also included. A sand collection pit 103 is provided on the bottom wall 104 of the tank 1, where heavy impurities will settle. The impurity removal unit includes a first cyclone tank 2 and a first cleaning tank 4 connected to the bottom of the first cyclone tank 2. A second solenoid valve 23 is provided at the connection between the first cyclone tank 2 and the first cleaning tank 4. The upper part of the first cyclone tank 2 is cylindrical, and the lower part is conical, forming a cyclone separation structure. A first input pipe 202 communicating with the interior is located on the upper side of the lower conical part of the first cyclone tank 2, and a first sand collection area 201 is located on the lower side. There is a preset incident angle between the first input pipe 202 and the lower conical part of the first cyclone tank 2. Preferably, the first input pipe 202 is in the radial tangent direction of the lower conical part of the first cyclone tank 2. Thus, when liquid is injected from the first input pipe 202 into the lower conical part of the first cyclone tank 2, a high-speed cyclone is formed. Under the action of the cyclone, heavy impurities are precipitated. The first sand collection zone 201, while lighter organic matter floats to the upper cylindrical part of the first cyclone tank 2; the first cleaning tank 4 has a first outlet 402 communicating with its interior on the upper side and a first inlet 401 communicating with its interior on the lower side, and a first impurity outlet at the bottom of the first cleaning tank 4. A fourth solenoid valve 25 is provided between the first cleaning tank 4 and the first impurity outlet. The sand collection pit 103 is connected to one end of the first separation pipe 12, and the other end of the first separation pipe 12 passes through the side wall of the tank body 1 and is connected to the first input pipe 202. The first separation pipe 12 is equipped with a separation pump 10. The top of the first cyclone tank 2 is equipped with a third separation pipe 14 communicating with its interior. The end of the third separation pipe 14 away from the first cyclone tank 2 is connected to the interior of the tank body 1. The purified liquid outlet 105 is equipped with a purified liquid output pipe 15, which is connected to the first inlet 401 through the first cleaning pipe 16. The first cleaning pipe 16 is equipped with a cleaning pump 11, and the first outlet 402 is connected to the purified liquid output pipe 15 through the sixth cleaning pipe 21.

[0034] Preferably, in order to collect heavy impurities into the sand collection pit 103 and prevent them from depositing on the bottom wall 104 of the tank body 1, the bottom wall 104 of the tank body 1 is designed to slope downward toward the center of the sand collection pit 103.

[0035] Preferably, to further prevent the deposition of heavy impurities, the sand collection pit 103 is located directly below the stirring shaft 101. The stirring shaft 101 is equipped with a scraper 102. The bottom of the scraper 102 is in contact with the bottom wall 104 of the tank body 1. When the stirring shaft 101 rotates, the scraper 102 can scrape off the sand and gravel and other heavy impurities deposited on the bottom wall 104 of the tank body 1 to prevent them from settling.

[0036] Preferably, to further and thoroughly separate heavy impurities, the system also includes a second cleaning pipe 17, a third cleaning pipe 18, a fourth cleaning pipe 19, a fifth cleaning pipe 20, a second cyclone tank 3, and a second cleaning tank 5 connected to the bottom of the second cyclone tank 3. A third solenoid valve 24 is provided at the connection between the second cyclone tank 3 and the second cleaning tank 5. The upper part of the second cyclone tank 3 is cylindrical, and the lower part is conical. The upper side of the lower part of the conical tube of the second cyclone tank 3 is provided with a second input pipe 302 communicating with its interior, and the lower side is a second sand collection area 301. Its overall principle is the same as that of the first cleaning tank 2, and will not be described in detail here. The second cleaning tank 5 has a second outlet 502 communicating with its interior on its upper side and a second inlet 501 communicating with its interior on its lower side. The second cleaning tank 5 has a second sludge outlet at its bottom. A fifth solenoid valve 26 is provided between the second cleaning tank 5 and the second sludge outlet. The other end of the first separation pipe 12 is connected to the second input pipe 302. The second vortex tank 3 has a second separation pipe 13 communicating with its interior on its top. The end of the second separation pipe 13 away from the second vortex tank 3 is connected to the first input pipe 202. One end of the second cleaning pipe 17 is connected to the first inlet 401. One end of the third cleaning pipe 18 is connected to the second inlet 501. The other ends of the second cleaning pipe 17 and the third cleaning pipe 18 are both connected to the first cleaning pipe 16. The second cleaning pipe 17 is provided with an eighth solenoid valve 29. The third cleaning pipe 18 is provided with a ninth solenoid valve 30. One end of the fourth cleaning pipe 19 is connected to the first outlet 402. One end of the fifth cleaning pipe 20 is connected to the second outlet 502. The other ends of the fourth cleaning pipe 19 and the fifth cleaning pipe 20 are both connected to the sixth cleaning pipe 21. To improve the separation of heavy impurities, this embodiment adds a second cyclone tank 3 for further separation. A third or fourth cyclone tank can also be added, depending on actual production needs. This improvement in separation is achieved by connecting the cyclone tanks in series. To improve separation efficiency, the cyclone tanks need to be connected in parallel, which is a connection method readily conceived by those skilled in the art and will not be described in detail here. At the same time, multiple cyclone tanks can be set up in parallel according to actual working needs to improve separation efficiency. Regardless of the method or number of cyclone tanks used, they are all within the scope of protection of the claims of this application.

[0037] Preferably, to facilitate the conveying of heavy impurities after separation, a feeding cylinder is also included. A spiral feeding rod 7 is rotatably mounted within the feeding cylinder along its axial direction. This spiral feeding structure is existing technology well-known to those skilled in the art and will not be described in detail here. The spiral feeding rod 7 is located directly below the first and second impurity outlets. The feeding cylinder has inlet holes corresponding to the first and second impurity outlets. Thus, heavy impurities such as sand and gravel from the first and second impurity outlets fall into the spiral feeding rod 7 and are conveyed to a predetermined position. The feeding cylinder has a sand outlet 8 and a motor 9. The output shaft of the motor 9 is connected to the spiral feeding rod 7, driving the spiral feeding rod 7 to rotate.

[0038] Preferably, since the heavy impurities such as sand and gravel after washing contain a large amount of water, in order to prevent water from overflowing and causing pollution to the work site, a sand storage box 6 is also included. The bottom wall of the sand storage box 6 is inclined, and the feeding cylinder is set outside the sand storage box 6 and parallel to the bottom wall of the sand storage box 6. The bottom of the spiral feeding rod 7 can move through the side wall of the sand storage box 6 and extend into the sand storage box 6. The end of the first impurity outlet away from the first cleaning tank 4 and the end of the second impurity outlet away from the second cleaning tank 5 are both connected to the inside of the sand storage box 6. In this way, the heavy impurities such as sand and gravel fall into the sand storage box 6 from the first impurity outlet and the second impurity outlet and are output by the spiral feeding rod 7. Since the spiral feeding rod 7 is inclined, during the process of the heavy impurities such as sand and gravel being output, the water in the heavy impurities such as sand and gravel flows into the sand storage box 6, thereby avoiding pollution to the work site.

[0039] Preferably, the sand storage tank 6 has a drain outlet 601 communicating with its interior, which is used to drain the water in the sand storage tank 6. The drain outlet 601 can be connected to the purification liquid output pipe 15 and collected into the subsequent processing steps.

[0040] Preferably, in order to facilitate observation of whether the heavy impurities deposited in the first sand collection zone 201 and the second sand collection zone 203 are full, a first observation window 203 is provided at the top of the first sand collection zone 201, and a second observation window 303 is provided at the top of the second sand collection zone 301.

[0041] Preferably, to prevent heavy impurities such as sand and gravel from being washed away during the cleaning process, the upper part of the first cleaning tank 4 is inverted conical and the lower part is cylindrical. The first inlet 401 is located at the bottom of the cylindrical part of the first cleaning tank 4, and there is a preset incident angle between the first inlet 401 and the first cleaning tank 4. Preferably, the first inlet 401 is on the radial tangent of the first cleaning tank 4, and the first outlet 402 is located at the top of the inverted conical part of the first cleaning tank 4. In this way, after the cleaning liquid is injected from the first inlet 401, it will form a vortex. Heavy impurities such as sand and gravel will be at the bottom, while the cleaned organic matter will be suspended at the top and discharged from the first outlet 402 under the convergence of the inverted conical part of the first cleaning tank 4. This preferably prevents heavy impurities such as sand and gravel from being washed away. The upper part of the second cleaning tank 5 is inverted conical tube shape, and the lower part is cylindrical. The second inlet 501 is located at the bottom of the cylindrical part of the second cleaning tank 5, and the second outlet 502 is located at the top of the inverted conical tube shape of the second cleaning tank 5. Its structural principle is the same as that of the first cleaning tank 4, and will not be described in detail here.

[0042] Preferably, to further prevent heavy impurities such as sand and gravel from being washed away, the volume of the first washing tank 4 is at least twice the volume of the first sand collection zone 201, and the volume of the second washing tank 5 is at least twice the volume of the second sand collection zone 301. In this way, the mass of heavy impurities in the first washing tank 4 and the second washing tank 5 is small, thus preventing heavy impurities such as sand and gravel from being washed away.

[0043] Preferably, in actual production, the first separation pipe 12 between the tank 1 and the separation pump 10 is equipped with a first solenoid valve 22, the third separation pipe 14 is equipped with a tenth solenoid valve 31, the first cleaning pipe 16 is equipped with a sixth solenoid valve 27, and the sixth cleaning pipe 21 is equipped with a seventh solenoid valve 28. The setting of these solenoid valves can effectively control the entire device and achieve the purpose of safe production and maintenance.

[0044] The working principle of this application is as follows:

[0045] Heavy impurities are deposited in the sand collection pit inside the tank. The separation pump starts and draws out the heavy impurities, which are then injected into the first cyclone tank through the first input pipe. The heavy impurities are separated by high-speed rotation in the first cyclone tank. Heavy impurities such as sand and gravel are settled into the first sand collection area, while organic matter is separated to the top of the first cyclone tank and then enters the tank body through the third separation pipe for purification. When the amount of heavy impurities such as sand and gravel settled in the first sand collection area reaches a preset amount, the separation pump is turned off, the second solenoid valve is opened, and the settled heavy impurities such as sand and gravel in the first sand collection area flow into the first cleaning tank. Then the second solenoid valve is closed. The cleaning pump is started, and the cleaning pump draws the purified water from the tank body into the first cleaning tank to clean the heavy impurities such as sand and gravel. After cleaning, the heavy impurities such as sand and gravel are discharged from the first outlet, which will not cause environmental pollution.

[0046] The present application has been described in a relatively specific and detailed manner above through general descriptions and specific embodiments. It should be understood that, based on the technical concept of the present application, several conventional adjustments or further innovations can be made to these specific embodiments; however, as long as they do not depart from the technical concept of the present application, the technical solutions obtained by these conventional adjustments or further innovations also fall within the protection scope of the claims of the present application.

Claims

1. An online heavy impurity removal device, comprising a tank (1); a stirring shaft (101) is rotatably provided axially inside the tank (1); a purified liquid outlet (105) communicating with the top of the tank (1) is provided, characterized in that, It also includes an impurity removal unit; a sand collection pit (103) is provided on the bottom wall (104) of the tank body (1); the impurity removal unit includes a first cyclone tank (2) and a first cleaning tank (4) connected to the bottom of the first cyclone tank (2); a second solenoid valve (23) is provided at the connection between the first cyclone tank (2) and the first cleaning tank (4); the upper part of the first cyclone tank (2) is cylindrical and the lower part is conical; the upper side of the lower part of the conical tube of the first cyclone tank (2) is provided with a first input pipe (202) communicating with its interior, and the lower side is a first sand collection area (201); the upper side of the first cleaning tank (4) is provided with a first outlet (402) communicating with its interior, and the lower side is provided with a first inlet (401) communicating with its interior; the bottom of the first cleaning tank (4) is provided with a first impurity outlet; a fourth solenoid valve is provided between the first cleaning tank (4) and the first impurity outlet. A solenoid valve (25); the sand collection pit (103) is connected to one end of the first separation pipe (12), and the other end of the first separation pipe (12) passes through the side wall of the tank body (1) and is connected to the first input pipe (202); the first separation pipe (12) is equipped with a separation pump (10); the top of the first cyclone tank (2) is equipped with a third separation pipe (14) connected to its interior; the end of the third separation pipe (14) away from the first cyclone tank (2) is connected to the interior of the tank body (1); the purified liquid outlet (105) is equipped with a purified liquid output pipe (15); the purified liquid output pipe (15) is connected to the first inlet (401) through the first cleaning pipe (16); the first cleaning pipe (16) is equipped with a cleaning pump (11); the first outlet (402) is connected to the purified liquid output pipe (15) through the sixth cleaning pipe (21); The bottom wall (104) of the tank (1) slopes downward toward the center of the sand collection pit (103); It also includes a second cleaning pipe (17), a third cleaning pipe (18), a fourth cleaning pipe (19), a fifth cleaning pipe (20), a second cyclone tank (3), and a second cleaning tank (5) connected to the bottom of the second cyclone tank (3); a third solenoid valve (24) is provided at the connection between the second cyclone tank (3) and the second cleaning tank (5); the upper part of the second cyclone tank (3) is cylindrical, and the lower part is conical; the upper side of the lower part of the conical tube of the second cyclone tank (3) is provided with a second input pipe (302) communicating with its interior, and the lower side is a second sand collection area (301); the upper side of the second cleaning tank (5) is provided with a second outlet (502) communicating with its interior, and the lower side is provided with a second inlet (501) communicating with its interior; the bottom of the second cleaning tank (5) is provided with a second impurity outlet; a fifth solenoid valve (26) is provided between the second cleaning tank (5) and the second impurity outlet; the other end of the first separation pipe (12) is connected to the second input pipe (302). The second cyclone tank (3) is provided with a second separation pipe (13) at the top and connected to the inside of it; the end of the second separation pipe (13) away from the second cyclone tank (3) is connected to the first input pipe (202); one end of the second cleaning pipe (17) is connected to the first inlet (401); one end of the third cleaning pipe (18) is connected to the second inlet (501); the other end of the second cleaning pipe (17) and the other end of the third cleaning pipe (18) are both connected to the first cleaning pipe (16); the second cleaning pipe (17) is provided with an eighth solenoid valve (29); the third cleaning pipe (18) is provided with a ninth solenoid valve (30); one end of the fourth cleaning pipe (19) is connected to the first outlet (402); one end of the fifth cleaning pipe (20) is connected to the second outlet (502); the other end of the fourth cleaning pipe (19) and the other end of the fifth cleaning pipe (20) are both connected to the sixth cleaning pipe (21).

2. The online heavy impurity removal device according to claim 1, characterized in that, The sand collection pit (103) is located directly below the stirring shaft (101); the stirring shaft (101) is equipped with a scraper (102) for scraping off heavy impurities deposited on the bottom wall (104) of the tank (1).

3. The online heavy impurity removal device according to claim 1, characterized in that, It also includes a feeding cylinder; a spiral feeding rod (7) is rotatably provided in the feeding cylinder along its axial direction; the spiral feeding rod (7) is located directly below the first and second impurity outlets; the feeding cylinder has an inlet hole corresponding to the first and second impurity outlets, for heavy impurities from the first and second impurity outlets to fall into the spiral feeding rod (7); the feeding cylinder has a sand outlet (8); the feeding cylinder also has a motor (9); the output shaft of the motor (9) is connected to the spiral feeding rod (7) to drive the spiral feeding rod (7) to rotate.

4. The online heavy impurity removal device according to claim 3, characterized in that, It also includes a sand storage box (6); the bottom wall of the sand storage box (6) is inclined; the feeding cylinder is located outside the sand storage box (6) and is parallel to the bottom wall of the sand storage box (6); the bottom of the spiral feeding rod (7) can move through the side wall of the sand storage box (6) and extend into the sand storage box (6); the first outlet of impurities is far away from the first cleaning tank (4) and the second outlet of impurities is far away from the second cleaning tank (5) and are both connected to the inside of the sand storage box (6).

5. The online heavy impurity removal device according to claim 4, characterized in that, The sand storage tank (6) has a drain outlet (601) that communicates with its interior.

6. The online heavy impurity removal device according to claim 1, characterized in that, The first sand collection area (201) is provided with a first observation window (203) at the top; the second sand collection area (301) is provided with a second observation window (303) at the top.

7. The online heavy impurity removal device according to claim 1, characterized in that, The first cleaning tank (4) has an inverted conical tube shape at the top and a cylindrical shape at the bottom; the first inlet (401) is located at the bottom of the cylindrical part of the first cleaning tank (4); the first outlet (402) is located at the top of the inverted conical tube shape of the first cleaning tank (4); the second cleaning tank (5) has an inverted conical tube shape at the top and a cylindrical shape at the bottom; the second inlet (501) is located at the bottom of the cylindrical part of the second cleaning tank (5); the second outlet (502) is located at the top of the inverted conical tube shape of the second cleaning tank (5).

8. The online heavy impurity removal device according to claim 7, characterized in that, The volume of the first cleaning tank (4) is at least twice the volume of the first sand collection area (201); the volume of the second cleaning tank (5) is at least twice the volume of the second sand collection area (301).

9. The online heavy impurity removal device according to claim 1, characterized in that, The first separation pipe (12) between the tank (1) and the separation pump (10) is equipped with a first solenoid valve (22); the third separation pipe (14) is equipped with a tenth solenoid valve (31); the first cleaning pipe (16) is equipped with a sixth solenoid valve (27); and the sixth cleaning pipe (21) is equipped with a seventh solenoid valve (28).

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