Multifunctional quenching liquid filtering and circulating device

Abstract

The utility model relates to the technical field of quenching liquid treatment, in particular to a multifunctional quenching liquid filtering and circulating device which comprises a tempered glass liquid storage cylinder, a horizontal liquid guide square bin is connected to the bottom of the tempered glass liquid storage cylinder, and a central filtering unit is installed in a liquid storage circular cavity. A sedimentation iron removal unit is arranged in the liquid storage circular cavity above the central filtering unit; the upper part of the sedimentation iron removal unit is hooked on the outer side wall of the opening part of the tempered glass liquid storage barrel; and liquid discharge circulating pipe orifices which are provided with discharge valves and are communicated with the internal liquid guide cavity are mounted at the bottoms of the left side and the right side of the horizontal liquid guide square bin. According to the device, the quenching liquid which is used for a long time can be subjected to centralized multi-stage filtration treatment, the quenching liquid subjected to multi-stage filtration treatment can be matched with an external circulation pipeline to circularly feed the quenching liquid subjected to filtration and impurity removal into upstream liquid storage equipment again, and finally multi-stage filtration and cyclic recycling of the quenching liquid are completed.

Description

Technical Field

[0001] The utility model relates to the technical field of quenching liquid treatment, in particular to a multifunctional filtering and circulating device for quenching liquid. Background Art

[0002] Quenching fluid is a cooling medium used in the process of metal heat treatment. It is crucial to control the cooling rate of the workpiece and improve the mechanical properties of the material. After long-term use, there may be a variety of impurities in the quenching fluid. These impurities may come from chemical reactions during the quenching process, residues on the surface of the workpiece, and degradation of the quenching medium itself.

[0003] During the quenching process, a chemical reaction may occur when the high-temperature metal workpiece contacts the quenching medium, generating some precipitates or dissolved substances. In addition, tiny metal particles may fall off the workpiece during the quenching process, and these particles will mix into the quenching liquid.

[0004] Therefore, in order to maintain the performance of the quenching fluid and extend its service life, the quenching fluid needs to be inspected and treated regularly to remove impurities and replenished or replaced as needed.

[0005] For example, a quenching liquid magnetic filtering device is disclosed in the patent document with patent publication number CN102698503A, whose main structure includes a number of purification boxes which are interconnected in sequence and whose bottoms are gradually lowered, including a filtering and settling box and an outlet filtering box, the filtering and settling box and the outlet filtering box are respectively provided with an inlet and an outlet, a magnetic adsorption device for adsorbing ferrous impurities in the quenching liquid is provided in the filtering and settling box, the magnetic adsorption device is at least partially immersed in the quenching liquid in the filtering and settling box, and a chip removal and extraction device for scraping off ferrous impurities on the magnetic adsorption device and extracting the ferrous impurities is provided next to the part of the magnetic adsorption device exposed from the quenching liquid.

[0006] It can be seen from the above-mentioned prior art that when it is working, it mainly removes iron impurities by magnetic adsorption. However, the impurity composition inside the quenching liquid after long-term use is complex, and it is not a single iron impurity. This magnetic impurity removal method cannot achieve the purpose of stable impurity removal, and the impurity removal accuracy is poor, and non-iron impurities cannot be effectively removed.

[0007] To this end, the utility model optimizes and improves the problems of poor impurity removal effect and difficulty in recycling the quenching liquid in the existing quenching liquid filtering and impurity removal process, and specially proposes a quenching liquid multifunctional filtering and circulating device to better solve the problems existing in the prior art. Utility Model Content

[0008] The utility model is to solve one of the above technical problems, and the technical solution adopted is: a multifunctional filtering and circulating device for quenching liquid, comprising a tempered glass liquid storage cylinder vertically fixed on the top of a base connected to the ground, a horizontal liquid guide square bin is connected to the bottom of the tempered glass liquid storage cylinder, the internal liquid guide cavity of the horizontal liquid guide square bin is connected to the liquid storage circular cavity inside the tempered glass liquid storage cylinder, a central filtering unit is installed inside the liquid storage circular cavity, and a sedimentation and iron removal unit is arranged in the liquid storage circular cavity above the central filtering unit; the upper part of the sedimentation and iron removal unit The hook is hung on the outer side wall of the opening of the tempered glass liquid storage cylinder, an upper sealing plug is installed on the top of the sedimentation and iron removal unit, and a discharge circulation pipe outlet with a discharge valve and connected to the internal liquid guide cavity is installed on the bottom of the left and right sides of the horizontal liquid guide square warehouse. The discharge circulation pipe outlet is connected with the liquid storage equipment of the quenching process through a circulation pipeline with a pump, and a cleaning unit is installed inside the central filter unit. The top of the cleaning unit movably passes through the top of the central filter unit and is plugged with the bottom of the sedimentation and iron removal unit.

[0009] In any of the above schemes, it is preferred that the central filter unit includes an inner core tube vertically inserted in the lower part of the liquid storage circular cavity, the outer wall of the inner core tube is sealed against the inner wall of the liquid storage circular cavity, the bottom of the inner core tube is against the bottom of the internal liquid guiding cavity, an upper filter screen is installed at the top opening of the inner core tube, and lower lateral filter screens are installed at the openings on the left and right sides of the inner core tube at the internal liquid guiding cavity, and the mesh diameter of the lower lateral filter screen is smaller than the mesh diameter of the upper filter screen.

[0010] In any of the above schemes, it is preferred that the sedimentation and iron removal unit includes a sedimentation cylinder installed in the liquid storage circular cavity just above the central filter unit, an inverted truncated cone cavity is provided at the inner bottom of the sedimentation cylinder, and overflow filter screens are respectively installed at the overflow openings of the side walls of the sedimentation cavity above the inverted truncated cone cavity, the mesh diameter of the overflow filter screen is larger than the mesh diameter of the upper filter screen, a spacing space is provided between the outer wall of the sedimentation cylinder and the liquid storage circular cavity, and a plurality of hook portions are evenly spaced along the circumference of the top of the sedimentation cylinder, and each of the hook portions is clamped on the outer wall of the opening of the sedimentation cylinder.

[0011] In any of the above solutions, preferably, a rotating handle is fixedly welded on the outer side wall of each hook portion.

[0012] In any of the above schemes, it is preferred that the upper sealing plug is installed in the sedimentation chamber above the inverted truncated cone chamber, and the bottom of the upper sealing plug extends into the sedimentation chamber below the overflow opening.

[0013] In any of the above schemes, it is preferred that an inner tube is fixedly installed at the bottom of the lower curved portion of the sedimentation cylinder, an external thread is provided on the outer wall of the inner tube, a strong magnet is installed inside the inner tube, a sealing cap is threadedly screwed on the outer wall of the inner tube, the top of the sealing cap abuts against the bottom of the lower curved portion of the sedimentation cylinder, a connecting pipe is welded at the bottom center of the sealing cap, a polygonal prism cavity is provided inside the connecting pipe, the polygonal prism cavity is used to cooperate and plug with the top of the cleaning unit thereunder, and when the rotating handle is turned to drive the sedimentation and iron removal unit to rotate, the polygonal prism cavity can drive the cleaning unit to rotate on a fixed axis.

[0014] In any of the above schemes, preferably, the cleaning unit includes a central vertical shaft vertically inserted in the central hole of the upper filter screen, a polygonal prism end head is welded on the top of the central vertical shaft, the upper part of the polygonal prism end head is used to cooperate with the insertion inside the polygonal prism cavity and rotate with the polygonal prism cavity, an inverted U-shaped rod is fixedly installed at the bottom of the central vertical shaft, and cleaning brushes opposite to and abutting the corresponding lower lateral filter screen are fixedly installed on the outer side walls of the two vertical sections of the inverted U-shaped rod, and the bottom of the inverted U-shaped rod abuts the bottom of the inner cavity of the inner core tube.

[0015] In any of the above schemes, it is preferred that sealing plugs are provided with lateral sealing end covers at both ends of the internal liquid guiding cavity of the horizontal liquid guiding square bin, and side opening handles are installed on the outer side walls of each of the lateral sealing end covers.

[0016] Compared with the prior art, the beneficial effects of the utility model are as follows:

[0017] 1. The multifunctional filtering and circulating device for quenching liquid in the utility model can realize centralized multi-stage filtering treatment of quenching liquid after long-term use. The quenching liquid after multi-stage filtering treatment can cooperate with the external circulation pipeline to realize the recirculation of the filtered and impurity-removed quenching liquid into the upstream liquid storage device, and finally complete the multi-stage filtration and recycling of the quenching liquid.

[0018] 2. When filtering the quenching liquid, the multifunctional filtering and circulating device for quenching liquid in the utility model can collect the iron and impurities contained in the sedimentation and iron removal unit by pouring a proper amount of quenching liquid into the sedimentation and iron removal unit and letting it settle. The use of strong magnets can improve the efficiency of collecting iron and make it accumulate at the bottom, and preliminarily complete the sedimentation of impurities.

[0019] 3. After continuously pouring the quenching liquid, the quenching liquid will flow out through the overflow filter screens on both sides and fall downward on the corresponding central filter unit, and complete the second filtration through the upper filter screen. When passing through the lower lateral filter screens on both sides below, the third filtration is achieved. Multi-stage filtration can better ensure the rapid blocking and removal of impurity particles in the quenching liquid, and ensure the relative cleanliness of the quenching liquid entering the internal liquid guide cavity.

[0020] 4. By controlling the operation of the cleaning unit, the impurities accumulated on the lower lateral filter screens with smaller apertures on both sides can be brushed and cleaned by fixed-axis rotation, thereby preventing impurities from clogging the fine mesh apertures and ensuring normal filtration of the lower lateral filter screens. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] In order to more clearly illustrate the technical solution of the specific implementation of the utility model, the following will briefly introduce the drawings required for the specific implementation. In all the drawings, similar elements or components are generally identified by similar reference numerals. In the drawings, each element or component is not necessarily drawn according to the actual scale.

[0022] Figure 1 It is a schematic diagram of the external structure of the utility model.

[0023] Figure 2 It is a schematic diagram of the partial internal cross-sectional structure of the utility model.

[0024] Figure 3 It is a schematic diagram of the internal cross-sectional structure of the utility model after removing the upper sealing plug.

[0025] Figure 4 It is a structural schematic diagram of the cleaning unit of the utility model.

[0026] In the figure, 1. ground-connected base; 2. tempered glass liquid storage cylinder; 3. horizontal liquid guide square bin; 4. internal liquid guide cavity; 5. liquid storage circular cavity; 6. upper sealing plug; 7. discharge valve; 8. discharge circulation pipe outlet; 9. circulation pipeline; 10. liquid storage equipment; 11. inner core cylinder; 12. upper filter screen; 13. lower lateral filter screen; 14. sedimentation cylinder; 15. inverted frustum cavity; 16. sedimentation cavity; 17. overflow filter screen; 18. hook part; 19. rotating handle; 20. inner tube; 21. strong magnet; 22. sealing cap; 23. connecting pipe; 2301. polygonal prism cavity; 24. central vertical axis; 25. polygonal prism end; 26. inverted U-shaped rod; 27. cleaning brush; 28. lateral sealing end cover; 29. ​​side opening handle. DETAILED DESCRIPTION

[0027] The following is a detailed description of the embodiments of the technical solution of the utility model in conjunction with the accompanying drawings. The following embodiments are only used to more clearly illustrate the technical solution of the utility model, and are therefore only used as examples, and cannot be used to limit the scope of protection of the utility model. Figure 1-Figure 4 as shown in .

[0028] Embodiment: A multifunctional filtering and circulating device for quenching liquid comprises a tempered glass liquid storage cylinder 2 fixedly arranged vertically on the top of a ground-connected base 1, a horizontal liquid guiding square bin 3 is connected to the bottom of the tempered glass liquid storage cylinder 2, an internal liquid guiding cavity 4 of the horizontal liquid guiding square bin 3 is communicated with a liquid storage circular cavity 5 inside the tempered glass liquid storage cylinder 2, a central filtering unit is installed inside the liquid storage circular cavity 5, and a sedimentation and iron removal unit is arranged in the liquid storage circular cavity 5 above the central filtering unit; the upper part of the sedimentation and iron removal unit is hooked on the outer side wall of the opening part of the tempered glass liquid storage cylinder 2, an upper sealing plug 6 is installed above the sedimentation and iron removal unit, and a sealing plug 6 is installed above the horizontal liquid guiding square bin 3. warehouse The bottom of the left and right sides of 3 are both equipped with discharge valves 7 and are connected to the internal liquid guide cavity 4. The discharge circulation pipe port 8 is connected to the liquid storage device 10 of the quenching process through a circulation pipeline 9 with a pump. The multifunctional quenching liquid filtering circulation device in this design can use the internal tempered glass liquid storage cylinder 2 to observe the filtering condition of the internal quenching liquid when processing the quenching liquid. The use of transparent tempered glass can ensure the strength of the cylinder and ensure that the cleanliness of the internal quenching liquid can be observed.

[0029] When it is necessary to pour the quenching liquid into the interior of the device, the upper sealing plug 6 is controlled to open. At this time, the quenching liquid is poured into the sedimentation and iron removal unit. The quenching liquid can settle an appropriate amount of common granular impurities and iron impurities at the bottom after settling in the sedimentation and iron removal unit. Continuing to slowly pour the quenching liquid can make the quenching liquid continuously overflow through the overflow filter 17 and realize the first filtration in the overflow process. The overflowing quenching liquid enters the central filter unit to complete the second and third filtrations, and is finally discharged through the drainage circulation pipe port 8 and refluxed to the liquid storage device 10 of the quenching process for reuse in conjunction with the circulation pipeline 9.

[0030] In any of the above schemes, it is preferred that the central filter unit includes an inner core tube 11 which is vertically fitted and inserted in the lower part of the liquid storage circular cavity 5, the outer wall of the inner core tube 11 is sealed against the inner wall of the liquid storage circular cavity 5, the bottom of the inner core tube 11 is against the bottom of the internal liquid guiding cavity 4, an upper filter screen 12 is installed at the top opening of the inner core tube 11, and a lower lateral filter screen 13 is installed at the openings on the left and right sides of the inner core tube 11 at the internal liquid guiding cavity 4, and the mesh diameter of the lower lateral filter screen 13 is smaller than the mesh diameter of the upper filter screen 12.

[0031] When the central filter unit receives the quenching liquid falling from the upstream, it can complete the second filtration through the upper filter screen 12 on the top, and can further filter the smaller particles in the quenching liquid. After the second filtration, the quenching liquid directly falls into the inner core tube 11, and then completes the third filtration through the lower lateral filter screens 13 on both sides, finally reaching the standard for reuse.

[0032] In any of the above schemes, it is preferred that the sedimentation and iron removal unit includes a sedimentation cylinder 14 which is installed in the liquid storage circular cavity 5 just above the central filter unit, and an inverted truncated cone cavity 15 is provided at the inner bottom of the sedimentation cylinder 14. Overflow filter screens 17 are respectively installed at the overflow openings of the side walls of the sedimentation cavity 16 above the inverted truncated cone cavity 15. The mesh diameter of the overflow filter screen 17 is larger than the mesh diameter of the upper filter screen 12. A spacing space is provided between the outer wall of the sedimentation cylinder 14 and the liquid storage circular cavity 5, and a plurality of hook portions 18 are evenly spaced along the circumference of the top of the sedimentation cylinder 14, and each of the hook portions 18 is clamped on the outer wall of the opening of the sedimentation cylinder 14.

[0033] The sedimentation and iron removal unit mainly relies on multiple hook parts 18 to hook and set the entire sedimentation cylinder 14, and at the same time, by pouring quenching liquid into the interior of the sedimentation cylinder 14, the impurities in the quenching liquid can be accumulated inside the inverted conical cavity 15, and at the same time, the corresponding strong magnet 21 is used to achieve the purpose of further iron removal and iron absorption, so that the iron impurities are accumulated inside the inverted conical cavity 15.

[0034] The overflow filter 17 serves the purpose of initially filtering out large particles of impurities, thereby completing the first filtering and impurity removal.

[0035] In any of the above solutions, preferably, a rotating handle 19 is fixedly welded on the outer side wall of each hook portion 18 .

[0036] The fixedly installed rotating handles 19 can drive the entire sedimentation cylinder 14 to realize fixed-axis rotation when rotating, so that the rotation control of the sedimentation cylinder 14 can be completed in coordination with the operation of the rotating handles 19, thereby driving the rotation of the cleaning unit at the bottom that is plugged and matched with it, thereby completing the cleaning of impurities at the lower lateral filter screen 13.

[0037] In any of the above schemes, it is preferred that the upper sealing plug 6 is installed in the sedimentation chamber 16 above the inverted truncated cone chamber 15, and the bottom of the upper sealing plug 6 extends into the sedimentation chamber 16 below the overflow opening.

[0038] When the device is idle, the overflow opening can be sealed by installing a corresponding upper sealing plug 6.

[0039] A cleaning unit is installed inside the central filter unit. The top of the cleaning unit movably passes through the top of the central filter unit and is plugged with the bottom of the sedimentation iron removal unit.

[0040] In any of the above schemes, it is preferred that an inner tube 20 is fixedly installed at the bottom of the lower curved portion of the sedimentation cylinder 14, an external thread is provided on the outer wall of the inner tube 20, a strong magnet 21 is installed inside the inner tube 20, a sealing cap 22 is threadedly screwed on the outer wall of the inner tube 20, the top of the sealing cap 22 abuts against the bottom of the lower curved portion of the sedimentation cylinder 14, a connecting pipe 23 is welded at the bottom center of the sealing cap 22, and a polygonal prism cavity 2301 is provided inside the connecting pipe 23, the polygonal prism cavity 2301 is used to cooperate and plug with the top of the cleaning unit thereunder, and when the rotating handle 19 is turned to drive the sedimentation and iron removal unit to rotate, the polygonal prism cavity 2301 can drive the cleaning unit to rotate on a fixed axis.

[0041] By screwing the sealing cap 22, it is possible to control the internal strong magnet 21 to complete the internal locking and positioning; in addition, the polygonal prism cavity 2301 welded on the bottom of the sealing cap 22 acts as a driving sleeve to drive the cleaning unit plugged into the bottom to rotate on a fixed axis, thereby achieving the purpose of quickly cleaning the impurities on the inner surface of the lower lateral filter 13, and the operation is simple and quick.

[0042] In any of the above schemes, it is preferred that the cleaning unit includes a central shaft 24 vertically inserted in the central hole of the upper filter screen 12, and a polygonal column end 25 is welded to the top of the central shaft 24, and the upper part of the polygonal column end 25 is used to cooperate with the insertion inside the polygonal column cavity 2301 and rotate with the polygonal column cavity 2301, and an inverted U-shaped rod 26 is fixedly installed at the bottom of the central shaft 24, and cleaning brushes 27 corresponding to and abutting the corresponding lower lateral filter screen 13 are fixedly installed on the outer walls of the two vertical sections of the inverted U-shaped rod 26, and the bottom of the inverted U-shaped rod 26 abuts against the bottom of the inner cavity of the inner core tube 11.

[0043] When the cleaning unit is working, it mainly relies on the cooperation of the polygonal prism cavity 2301 at the bottom of the sedimentation and iron removal unit above it with the ferrule. After the ferrule is inserted, the corresponding rotating handle 19 can be turned to drive the entire sedimentation and iron removal unit to rotate on a fixed axis inside the liquid storage circular cavity 5, thereby achieving the purpose of driving the polygonal prism end 25 at the bottom to rotate on a fixed axis, and finally driving the cleaning brushes 27 on both sides of the central vertical axis 24 and the inverted U-shaped rod 26 to rotate and complete the cleaning of impurities on the lower lateral filter screen 13 on the corresponding side.

[0044] In any of the above schemes, it is preferred that sealing plugs are installed with lateral sealing end covers 28 at both ends of the internal liquid guiding cavity 4 of the horizontal liquid guiding square bin 3, and side opening handles 29 are installed on the outer side walls of each of the lateral sealing end covers 28.

[0045] The side sealing end cap 28 provided here can be opened quickly as needed, and by controlling the opening of the side sealing end cap 28, the interior of the internal liquid guiding cavity 4 can be effectively cleaned, and the overall cleaning operation is relatively simple and fast, and the disassembly is fast and convenient. When disassembling, the difficulty of disassembly can be reduced by operating the side opening handle 29.

[0046] Specific working principle: When the device processes the quenching liquid, the internal tempered glass liquid storage cylinder 2 can be used to observe the filtering of the internal quenching liquid. The use of transparent tempered glass can ensure the strength of the cylinder and ensure that the cleanliness of the internal quenching liquid can be observed. When it is necessary to pour the quenching liquid into the interior of the device, the upper sealing plug 6 is controlled to open. At this time, the quenching liquid is poured into the sedimentation and iron removal unit. The quenching liquid can settle an appropriate amount of common granular impurities and iron impurities at the bottom after settling in the sedimentation and iron removal unit. Continuing to slowly pour the quenching liquid can make the quenching liquid overflow through the overflow filter 17 and achieve the first filtration during the overflow process. The overflowed quenching liquid enters the central filter unit to complete the second and third filtrations, and is finally discharged through the drainage circulation pipe port 8 and refluxed to the liquid storage device 10 of the quenching process in conjunction with the circulation pipeline 9 for reuse.

[0047] From the above, it can be seen that the multifunctional filtering and circulating device for quenching liquid can realize centralized multi-stage filtering treatment of quenching liquid after long-term use. The quenching liquid after multi-stage filtering treatment can cooperate with the external circulation pipeline 9 to realize the quenching liquid after filtering and impurity removal and recirculate it into the upstream liquid storage device 10, and finally complete the multi-stage filtration and recycling of the quenching liquid; when filtering the quenching liquid, by pouring an appropriate amount of quenching liquid into the sedimentation and iron removal unit and letting it settle, the iron and impurities contained in the interior can be precipitated and collected, and the strong magnet 21 can be used to improve the efficiency of collecting iron and make it accumulate at the bottom, and the impurity sedimentation is preliminarily completed; the quenching liquid is continuously poured into the sedimentation and iron removal unit. After the quenching liquid is filtered, it will flow out through the overflow filter screens 17 on both sides and fall downward on the corresponding central filter unit, and complete the second filtration through the upper filter screen 12. When passing through the lower lateral filter screens 13 on both sides below, the third filtration is achieved. The multi-stage filtration can better ensure the rapid blocking and removal of impurity particles in the quenching liquid, and ensure the relative cleanliness of the quenching liquid entering the internal liquid guide cavity 4; by controlling the operation of the cleaning unit, the impurities accumulated on the lower lateral filter screens 13 with smaller apertures on both sides can be brushed and cleaned by fixed-axis rotation, thereby preventing impurities from clogging the fine mesh aperture and ensuring the normal filtration of the lower lateral filter screens 13.

[0048] The above embodiments are only used to illustrate the technical solution of the utility model, rather than to limit it. Although the utility model is described in detail with reference to the above embodiments, ordinary technicians in this field should understand that they can still modify the technical solutions recorded in the above embodiments, or replace some or all of the technical features therein with equivalents. These modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the utility model. For technicians in this technical field, any replacement improvements or changes made to the implementation methods of the utility model fall within the protection scope of the utility model.

[0049] The matters not described in detail in the present invention are all known technologies to those skilled in the art.

Claims

1. A multifunctional filtering and circulating device for quenching liquid, characterized in that: It comprises a tempered glass liquid storage cylinder which is vertically fixed on the top of a base connected to the ground, a horizontal liquid guiding square bin is connected to the bottom of the tempered glass liquid storage cylinder, an internal liquid guiding cavity of the horizontal liquid guiding square bin is communicated with the internal liquid storage circular cavity of the tempered glass liquid storage cylinder, a central filtering unit is installed inside the liquid storage circular cavity, and a sedimentation and iron removal unit is arranged in the liquid storage circular cavity above the central filtering unit; the upper part of the sedimentation and iron removal unit is hooked on the outer side wall of the opening part of the tempered glass liquid storage cylinder, an upper sealing plug is installed on the upper part of the sedimentation and iron removal unit, and a discharge circulation pipe outlet with a discharge valve and communicated with the internal liquid guiding cavity is installed on the bottom of the left and right sides of the horizontal liquid guiding square bin, and the discharge circulation pipe outlet is communicated with the liquid storage equipment of the quenching process through a circulation pipeline with a pump.

2. A multifunctional filtering and circulating device for quenching liquid according to claim 1, characterized in that: The central filter unit includes an inner core tube which is vertically inserted in the lower part of the liquid storage circular cavity, the outer wall of the inner core tube is sealed against the inner wall of the liquid storage circular cavity, the bottom of the inner core tube is against the bottom of the internal liquid guiding cavity, an upper filter screen is installed at the top opening of the inner core tube, and lower lateral filter screens are installed at the openings on the left and right sides of the inner core tube at the internal liquid guiding cavity, and the mesh diameter of the lower lateral filter screen is smaller than the mesh diameter of the upper filter screen.

3. A multifunctional filtering and circulating device for quenching liquid according to claim 2, characterized in that: The sedimentation and iron removal unit includes a sedimentation cylinder which is installed in the liquid storage circular cavity just above the central filter unit. An inverted truncated cone cavity is provided at the inner bottom of the sedimentation cylinder. Overflow filter screens are respectively installed at the overflow openings of the side walls of the sedimentation cavity above the inverted truncated cone cavity. The mesh diameter of the overflow filter screen is larger than the mesh diameter of the upper filter screen. A spacing space is provided between the outer wall of the sedimentation cylinder and the liquid storage circular cavity. A plurality of hook parts are evenly spaced along the circumference of the top of the sedimentation cylinder, and each of the hook parts is clamped on the outer wall of the opening of the sedimentation cylinder.

4. A multifunctional filtering and circulating device for quenching liquid according to claim 3, characterized in that: A rotating handle is fixedly welded on the outer side wall of each hook portion.

5. A multifunctional filtering and circulating device for quenching liquid according to claim 4, characterized in that: The upper sealing plug is installed in the sedimentation cavity above the inverted truncated cone cavity, and the bottom of the upper sealing plug extends into the sedimentation cavity below the overflow opening.

6. A multifunctional filtering and circulating device for quenching liquid according to claim 5, characterized in that: An inner tube is fixedly installed at the bottom of the lower curved portion of the sedimentation cylinder, an outer thread is arranged on the outer wall of the inner tube, a strong magnet is installed inside the inner tube, a sealing cap is threadedly screwed on the outer wall of the inner tube, the top of the sealing cap abuts against the bottom of the lower curved portion of the sedimentation cylinder, a connecting tube is welded at the bottom center of the sealing cap, a polygonal prism cavity is arranged inside the connecting tube, and the polygonal prism cavity is used to cooperate and plug with the top of the cleaning unit therebelow.

7. A multifunctional filtering and circulating device for quenching liquid according to claim 6, characterized in that: A cleaning unit is installed inside the central filter unit, and the top of the cleaning unit is movable to the top of the central filter unit and plugged with the bottom of the sedimentation and iron removal unit; when the rotating handle is turned to drive the sedimentation and iron removal unit to rotate, the polygonal column cavity can drive the cleaning unit to rotate on a fixed axis.

8. The multifunctional filtering and circulating device for quenching liquid according to claim 7, characterized in that: The cleaning unit includes a central vertical shaft vertically inserted in the central hole of the upper filter screen, a polygonal column end head is welded on the top of the central vertical shaft, the upper part of the polygonal column end head is used to cooperate with the insertion inside the polygonal column cavity and rotate with the polygonal column cavity, an inverted U-shaped rod is fixedly installed at the bottom of the central vertical shaft, and cleaning brushes opposite to and abutting the corresponding lower lateral filter screen are fixedly installed on the outer side walls of the two vertical sections of the inverted U-shaped rod, and the bottom of the inverted U-shaped rod abuts the bottom of the inner cavity of the inner core tube.

9. A multifunctional filtering and circulating device for quenching liquid according to claim 8, characterized in that: The sealing plugs at the two ends of the internal liquid guiding cavity of the horizontal liquid guiding square bin are equipped with lateral sealing end covers, and the outer side walls of each lateral sealing end cover are equipped with side opening handles.

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