Quenching oil cleaning device and method thereof

Abstract

This invention discloses a quenching oil cleaning device and method, belonging to the field of heat treatment technology. It includes an oil suction assembly, a first oil storage tank, a second oil storage tank, a filter assembly, and a recovery pump. The oil suction assembly is attached to the bottom of an oil tank and communicates with the first oil storage tank. The first oil storage tank is connected to the second oil storage tank, and the second oil storage tank is connected to the recovery pump. The filter assembly includes a filter unit that is slidably connected to the inner wall of the second oil storage tank. When the filter assembly is not in operation, the filter unit slides to the top of the second oil storage tank, and the bottom of the filter unit and the second oil storage tank form a first cavity for storing the quenching oil to be filtered. When the filter assembly is in operation, the filter unit moves towards the first cavity containing the quenching oil to be filtered, and the top of the filter unit and the second oil storage tank form a second cavity for storing the filtered quenching oil. This invention allows for periodic cleaning of the quenching oil, effectively maintaining its cooling effect and ensuring the quality of heat-treated workpieces.

Description

Technical Field

[0001] This invention belongs to the field of heat treatment technology, specifically relating to a quenching oil cleaning device and method. Background Technology

[0002] Oil cooling is a commonly used cooling method in the quenching process of product heat treatment. The cleaning and maintenance of quenching oil is crucial for improving product quality and extending the service life of quenching oil.

[0003] Currently, quenching oil and its storage tanks require maintenance every 1.5 to 2 years. Quenching oil contains suspended or precipitated carbides (especially prevalent during carburizing) and oxide particles of varying sizes attached to fixtures and other materials. These precipitates can solidify in the oil tank over time, affecting the cooling effect of the quenching oil. Excessive carbide particle contamination, in particular, can negatively impact the quality of quenched parts. While air is generally not easily introduced during heat treatment, it can enter the furnace and dissolve into the quenching oil when the front door is opened during furnace shutdown / maintenance, creating suspended oxide particles. Additionally, workpieces easily adsorb impurities, leading to contamination of the quenching oil, which severely affects its cooling effect and lifespan. The common maintenance method is to completely drain the oil from the tank and clean it. The drained quenching oil is not discarded directly; larger suspended particles are typically removed using a centrifuge, and it is often reused. However, with sludge adhering to it, the quenching oil is difficult to clean completely. In addition, extracting all the quenching oil and cleaning it requires a lot of manpower and time, making it impractical. Summary of the Invention

[0004] The purpose of this invention is to overcome the shortcomings of the prior art and provide a quenching oil cleaning device and method. This invention can periodically clean and maintain the quenching oil at the bottom of the oil tank in the heat treatment furnace, saving labor and time costs and minimizing the adverse effects of quenching on the quality of heat-treated workpieces.

[0005] This invention provides the following technical solution: In a first aspect, a quenching oil cleaning device is provided, comprising an oil suction assembly, a first oil storage tank, a second oil storage tank, a filter assembly, and a recovery pump; The oil suction component is attached to the bottom of the oil tank and is connected to the first oil storage tank; the first oil storage tank is connected to the second oil storage tank, and the second oil storage tank is connected to the recovery pump; The filtration assembly includes a filtration unit, which is slidably connected to the inner wall of the second oil storage tank. When the filter assembly is not in operation, the filter unit slides to the top of the second oil storage tank, and the bottom of the filter unit and the second oil storage tank form a first cavity for storing the quenching oil to be filtered. When the filtration assembly is working, the filtration unit moves toward the quenching oil to be filtered in the first chamber. The top of the filtration unit and the second oil storage tank form a second chamber for storing the filtered quenching oil.

[0006] Furthermore, the oil suction assembly includes an oil suction port, an oil suction pipe, and an oil suction pump. One end of the oil suction pipe is connected to the oil suction port and extends into the oil cooling chamber, while the other end is connected to the first oil storage tank through the oil suction pump. A magnet is provided on the side of the oil suction port facing the oil tank, and the magnet is attracted to the bottom of the oil tank.

[0007] Furthermore, the first oil storage tank is provided with an overflow valve at the top of its side wall, and the side wall of the first oil storage tank is connected to the bottom of the second oil storage tank through a primary oil inlet valve and a secondary oil inlet valve. The bottom of the first oil storage tank is provided with a first drain outlet.

[0008] Furthermore, the filtration assembly also includes a cylinder and a piston rod, and the filtration unit includes a first filter element, a second filter element, a third filter element, and a filter element connecting rod; one end of the piston rod is connected to the interior of the cylinder, and the other end extends into the second oil storage tank and is connected to one end of the filter element connecting rod; the first filter element, the second filter element, and the third filter element are sequentially sleeved on the other end of the filter element connecting rod from bottom to top; the outer walls of the first filter element, the second filter element, and the third filter element are slidably connected to the inner wall of the second oil storage tank; and the cylinder is installed on the top of the second oil storage tank.

[0009] Furthermore, the first filter element uses a metal filter screen, and the filtration accuracy of the first filter element is 20~100 µm.

[0010] Furthermore, the second filter element is made of either a multi-layer metal filter or a sintered metal filter, and the filtration accuracy of the second filter element is 5~30 µm.

[0011] Furthermore, the third filter element is a laminated sintered metal filter screen, and the filtration accuracy of the third filter element is 1~10 µm.

[0012] Furthermore, the top of the side wall of the second oil tank is provided with an overflow container, and the bottom of the second oil tank is also provided with an oil sludge storage tank. The bottom of the side wall of the second oil tank is vertically connected to one end of a recovery pipe, a first drain pipe, and a second drain pipe. The other end of the recovery pipe is connected to the recovery pump, which is connected to an oil tank for discharging the filtered quenching oil into the oil tank. The other ends of the first drain pipe and the second drain pipe are respectively directed toward the oil sludge storage tank for discharging the filtered oil sludge into the oil sludge storage tank.

[0013] Furthermore, when the filter unit slides to the bottom of the second oil storage tank, the top of the third filter element and the cavity formed by the second oil storage tank are connected to the recovery pipe. The cavity formed by the second filter element, the third filter element, and the second oil storage tank is connected to the first drain pipe through the first drain valve. The cavity formed by the first filter element, the second filter element, and the second oil storage tank is connected to the second drain pipe through the second drain valve.

[0014] In a second aspect, a method for cleaning quenching oil using the quenching oil cleaning device described in any one of the first aspects is provided, characterized in that it includes: Open and allow the heat treatment furnace to stand still; After the settling period is over, install and start the oil suction assembly, and move the filter unit to the top of the second oil storage tank; The quenching oil is drawn into the first oil storage tank and allowed to settle to obtain the first quenching oil supernatant and impurities. The supernatant of the first quenching oil is transferred to the second oil storage tank and allowed to settle to obtain the supernatant of the second quenching oil and impurities. The filter unit is moved toward the second quenching oil supernatant, so that the second quenching oil supernatant is filtered by the filter unit to obtain filtered quenching oil and impurities. The filtered quenching oil is discharged into the oil tank and the oil sludge is discharged into the oil sludge storage tank. Adjust the position of the oil suction component and repeat the suction, settling, and filtration process.

[0015] Furthermore, the oil suction assembly draws the quenching oil into the first oil storage tank at a rate of 50–200 L / min.

[0016] Furthermore, the moving speed of the filter unit towards the second quenching oil supernatant is 10–50 mm / s.

[0017] Compared with the prior art, the beneficial effects of the present invention are: This invention provides a quenching oil cleaning device that eliminates the need to completely remove and clean the entire tank of quenching oil. Instead, it utilizes an adsorption component to repeatedly adsorb the quenching oil at the bottom of the tank, followed by multiple settling and filtration processes. This removes suspended particles and sludge from the bottom of the oil layer, resulting in clean quenching oil and significantly reducing labor and time costs. Furthermore, this invention only requires periodic cleaning of the accumulated oil and sediment at the bottom of the tank, greatly extending the cycle of large-scale maintenance and repairs. Regular removal of suspended impurities from the oil minimizes their adverse effects on the quality of heat-treated workpieces. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the heat treatment furnace and quenching oil cleaning device in Embodiment 1 of the present invention; Figure 2This is a schematic diagram of the oil suction port in Embodiment 1 of the present invention; Figure 3 This is a schematic diagram of the structure of the filter unit in Embodiment 1 of the present invention; Figure 4 This is a schematic diagram of the structure of the filter component in Embodiment 1 of the present invention when it is not filtered.

[0019] The diagram is labeled as follows: 1. Oil suction assembly; 11. Oil suction port; 12. Oil suction pipe; 13. Oil suction pump; 14. Magnet; 2. First oil storage tank; 21. Overflow valve; 22. First-stage oil inlet valve; 23. Second-stage oil inlet valve; 24. First drain outlet; 3. Second oil storage tank; 31. Overflow container; 32. Recovery pipe; 33. First drain pipe; 34. Second drain pipe; 35. First drain valve; 36. Second drain valve; 37. Liquid level observation window; 4. Filter assembly; 41. Filter unit; 411. First filter element; 412. Second filter element; 413. Third filter element; 414. Filter element connecting rod; 42. Cylinder; 43. Piston rod; 5. Recovery pump; 6. Oil sludge storage tank; 61. Second drain outlet; 7. Oil cooling chamber; 71. Oil tank; 8. Front door. Detailed Implementation

[0020] The present invention will be further described below with reference to the accompanying drawings. The following embodiments are only used to more clearly illustrate the technical solution of the present invention, and should not be used to limit the scope of protection of the present invention.

[0021] It should be noted that in the description of this invention, the terms "front", "rear", "left", "right", "upper", "lower", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this invention and do not require that this invention must be constructed and operated in a specific orientation. Therefore, they should not be construed as limiting this invention.

[0022] In the description of this invention, it should be understood that the terms "first," "second," etc., are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Therefore, a feature defined with "first," "second," etc., may explicitly or implicitly include one or more of that feature. In the description of this invention, unless otherwise stated, "a plurality of" means two or more.

[0023] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art will understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0024] In the description of this invention, unless otherwise stated, "a plurality of" means two or more. The terms "comprising," "including," "having," "containing," etc., as used herein are open-ended, meaning they include but are not limited to.

[0025] It should be understood that the terminology used in this invention is merely for describing particular embodiments and is not intended to limit the invention. Furthermore, with respect to numerical ranges in this invention, it should be understood that each intermediate value between the upper and lower limits of the range is also specifically disclosed. Every smaller range between any stated value or intermediate value within a stated range, and any other stated value or intermediate value within said range, is also included in this invention. The upper and lower limits of these smaller ranges may be independently included or excluded from the range.

[0026] Example 1

[0027] like Figure 1 As shown, this embodiment provides a quenching oil cleaning device, including an oil suction assembly 1, a first oil storage tank 2, a second oil storage tank 3, a filter assembly 4, and a recovery pump 5.

[0028] The oil suction component 1 is attached to the bottom of the oil tank 71 and is connected to the first oil storage tank 2; the first oil storage tank 2 is connected to the second oil storage tank 3, and the second oil storage tank 3 is connected to the recovery pump 5. The filter assembly 4 includes a filter unit 41, which is slidably connected to the inner wall of the second oil storage tank 3. When the filter unit 41 slides to the top of the second oil storage tank 3, the bottom of the filter unit 41 and the second oil storage tank 3 form a first cavity for storing the quenching oil to be filtered. When the filter unit 41 slides to the bottom of the second oil storage tank 3, the top of the filter unit 41 and the second oil storage tank 3 form a second cavity for storing the filtered quenching oil.

[0029] like Figure 1 and Figure 2As shown, the oil suction assembly 1 includes an oil suction port 11, an oil suction pipe 12, and an oil suction pump 13. With the front door 8 of the heat treatment device opened, one end of the oil suction pipe 12 connects to the oil suction port 11 and extends into the oil tank 71 inside the oil cooling chamber 7. The other end connects to the first oil storage tank 2 via the oil suction pump 13. A magnet 14 is provided on the side of the oil suction port 11 facing the oil tank 71. The magnet 14 is attracted to the bottom of the oil tank 71, causing the oil suction port 11 to adhere to the bottom of the oil tank 71, sucking up all the oil sludge residue around the oil suction port 11. By moving the position of the oil suction port 11 within the oil tank 71, the suction position can be changed, ensuring that the oil suction assembly 1 sucks up all areas of the oil tank 71 (left, right, front, and rear) without leaving any blind spots, effectively sucking up the quenching oil within the oil tank 71. The sucked quenching oil contains oil sludge, deposits, and large (heavy) objects from the suspended impurities in the oil tank 71. In one possible embodiment, the bottom of the oil suction port 11 is a hollow frustum structure with an opening facing the oil tank 71. The magnet 14 is installed on the top surface of the hollow frustum structure. The oil suction port 11 is attached to the bottom of the oil tank 71. When the oil suction assembly 1 is working, it guides the flow along the inclined surface of the hollow frustum structure and sucks the oil and impurities into the oil suction assembly 1.

[0030] like Figure 1 As shown, an overflow valve 21 is provided on the top of the side wall of the first oil storage tank 2 to provide feedback on the overflow status of the first oil storage tank 2. In one possible embodiment, one end of the overflow valve 21 can also be connected to a hose, and the other end of the hose can be inserted into the oil tank 71 to prevent oil overflow from the first oil storage tank 2. In one possible embodiment, the first oil storage tank 2 can also be equipped with an oil level switch to automatically shut down the oil suction pump 13 before the liquid level reaches the height of the overflow valve 21. Before reaching the warning level of the overflow valve 21, the oil suction pump 13 can automatically or manually shut down the oil suction pump 13 after drawing oil to the specified level. The side wall of the first oil storage tank 2 is connected to the bottom of the second oil storage tank 3 through a primary oil inlet valve 22 and a secondary oil inlet valve 23. In one possible embodiment, in the vertical direction of the first oil storage tank 2, the primary oil inlet valve 22 is installed at a higher position on the side of the first oil storage tank 2, and the secondary oil inlet valve 23 is installed at a lower position on the side of the first oil storage tank 2. The quenching oil drawn from oil tank 71 into the first oil storage tank 2 undergoes a settling treatment, allowing heavier particles or impurities to settle at the bottom of the first oil storage tank 2. Therefore, compared to the secondary inlet valve 23, the quenching oil flowing from the primary inlet valve 22 to the second oil storage tank 3 contains relatively fewer suspended impurities. The bottom of the first oil storage tank 2 is also equipped with a first drain outlet 24.

[0031] like Figure 1As shown, the second oil storage tank 3 has an overflow container 31 on its top side for monitoring oil spillage. In one possible embodiment, the second oil storage tank 3 may also be equipped with a liquid level observation window 37 for observing the quenching oil inside. The bottom of the second oil storage tank 3 is also equipped with an oil sludge storage tank 6. The bottom of the side wall of the second oil storage tank 3 is vertically connected to one end of a recovery pipe 32, a first drain pipe 33, and a second drain pipe 34. The other end of the recovery pipe 32 is connected to a recovery pump 5, which can be connected to an oil tank 71 via a pipeline, allowing the treated quenching oil to return to the oil tank 71. The other ends of the first drain pipe 33 and the second drain pipe 34 face the oil sludge storage tank 6, respectively, for discharging filtered oil sludge into the oil sludge storage tank 6. An oil flange is fitted to the bottom of the second oil storage tank 3. In one possible embodiment, approximately three extended bolts are used for flange assembly. A flange support can be installed below the flange. After disassembly, the flange can be placed on the flange support, which saves the alignment and adjustment work required when reinstalling a flange contaminated with oil.

[0032] like Figure 1 and Figure 3As shown, the filter assembly 4 includes a filter unit 41, a cylinder 42, and a piston rod 43. The filter unit 41 includes a first filter element 411, a second filter element 412, a third filter element 413, and a filter element connecting rod 414. In this embodiment, providing multiple filter elements can reduce the workload of a single filter element. One end of the piston rod 43 is connected to the inside of the cylinder 42, and the other end extends into the second oil tank 3 and is connected to one end of the filter element connecting rod 414. The first filter element 411, the second filter element 412, and the third filter element 413 are sequentially sleeved on the other end of the filter element connecting rod 414 from bottom to top. The outer walls of the first filter element 411, the second filter element 412, and the third filter element 413 are slidably connected to the inner wall of the second oil tank 3, and the cylinder 42 is installed on the top of the second oil tank 3. The piston rod 43 is driven by the cylinder 42 to perform telescopic movement, which drives the filter unit 41 to perform vertical reciprocating movement in the second oil tank 3, thereby realizing the filtration of quenching oil by the filter assembly 4. The first filter element 411 serves as the coarse filtration layer, employing a metal mesh. Its filtration accuracy is 20-100 µm, effectively removing larger suspended impurities. Cleaning and replacement are very convenient. The second filter element 412 serves as the intermediate layer, using either a multi-layered metal mesh or a sintered metal mesh. Its filtration accuracy is 5-30 µm. Since large suspended impurities have already been removed by the first filter element 411, cleaning the second filter element 412 is significantly simplified. The third filter element 413 serves as the fine filtration layer, employing a stacked sintered metal mesh. Its filtration accuracy is 1-10 µm. From a cost perspective, this choice of filter element is practical. After the first two filtration stages, most suspended particles are pre-filtered, making cleaning and maintenance of the fine filtration layer even easier. In one possible embodiment, the filter assembly 4 can also be equipped with a speed controller to adjust the filtration speed as needed. For ease of cleaning, the components of the filter assembly 4 adopt an assembled structure, facilitating cleaning with high-pressure water. In one possible embodiment, the piston rod 43 and the filter element connecting rod 414 are detachably connected for easy replacement of the filter unit 41. In another possible embodiment, a seal is installed on the outer ring of each filter element in the filter unit 41 to prevent impurities from leaking into the subsequent filtration stage through the gap between the filter element and the second oil reservoir 3. Additionally, the outer wall of each filter element is machined to improve sealing performance. Figure 4 As shown, when the filter assembly 4 is not filtering, the filter unit 41 can be slid to the top of the second oil tank 3, so that the bottom of the filter unit 41 and the second oil tank 3 form a first cavity to accommodate the unfiltered quenching oil transported from the first oil tank 2. The first cavity and the second cavity mentioned in this embodiment are set according to the relative positions of the filter unit 41 and the second oil tank 3, that is, the space enclosed by the bottom of the first filter element 411 and the interior of the second oil tank 3 is the first cavity, and the space enclosed by the top of the third filter element 413 and the interior of the second oil tank 3 is the second cavity.

[0033] like Figure 1 and Figure 3 As shown, in one possible embodiment, the installation positions of the recovery pipe 32, the first drain pipe 33, and the second drain pipe 34 on the side of the second oil storage tank 3 are arranged according to the relative positions of the filter unit 41 and the second oil storage tank 3. When the filter unit 41 slides to the bottom of the second oil storage tank 3, the recovery pipe 32 is installed on the side wall of the second oil storage tank 3 above the third filter element 413, so that the top of the third filter element 413 is connected to the cavity formed by the second oil storage tank 3. The recovery pipe 32 is used to discharge the filtered quenching oil to the oil tank 71. The first drain pipe 33 is installed on the side wall of the second oil storage tank 3 between the third filter element 413 and the second filter element 412, so that the cavity formed by the third filter element 413, the second filter element 412, and the second oil storage tank 3 is connected to the first drain pipe 33 through the first drain valve 35, so as to discharge the impurities filtered between the third filter element 413 and the second filter element 412 to the oil storage tank 6. The second drain pipe 34 is installed on the side wall of the second oil storage tank 3 between the second filter element 412 and the first filter element 411, so that the cavity formed by the second filter element 412, the first filter element 411 and the second oil storage tank 3 is connected to the second drain pipe 34 through the second drain valve 36, and is used to discharge the impurities filtered between the second filter element 412 and the first filter element 411 into the oil storage tank 6.

[0034] Example 2

[0035] This embodiment, based on the apparatus provided in Embodiment 1, provides a method for cleaning quenching oil, including the following steps.

[0036] S0, Assemble the quenching oil cleaning device.

[0037] The quenching oil cleaning device is installed on the frame base and can be moved along with the base using cranes, forklifts or other equipment and placed in front of the corresponding heat treatment furnace.

[0038] S1. Open and let the heat treatment furnace stand still.

[0039] The cleaning of the quenching oil in oil tank 71 should be carried out regularly, or when the furnace is shut down. After the quenching oil cleaning device is in place and the front door 8 is opened, in order to prevent oxygen deficiency caused by residual gas in the furnace, the furnace cavity must be ventilated first, and the furnace door should be kept open and left to stand for a specified time. The stirring device for the quenching oil should also be turned off. Setting a standing time can also allow the sediment in oil tank 71 to settle to the bottom of oil tank 71.

[0040] S2. After the settling period is over, install and start the oil suction assembly 1, and move the filter unit 41 to the top of the second oil storage tank 3.

[0041] Before filtration, the filter unit 41 is moved to the top of the second oil storage tank 3. After the heat treatment furnace has finished its settling time, the oil suction pipe 12 is placed into the oil tank 71, so that the oil suction port 11 is attached to the bottom of the oil tank 71, and the oil suction pump 13 is started. During the suction process, the oil suction port 11 can be placed in different positions in the oil tank 71 to ensure that the oil suction assembly 1 can suck up the quenching oil from all directions at the bottom of the oil tank 71 without leaving any dead corners. In this embodiment, since the heat treatment furnace has undergone settling treatment, the quenching oil sucked up contains sludge, deposits, and large (heavy) objects from the suspended impurities in the oil, which are accumulated at the bottom of the oil tank 71.

[0042] S3. The quenching oil is drawn out into the first oil storage tank 2 and allowed to settle to obtain the first quenching oil supernatant and impurities.

[0043] The quenching oil is drawn into the first storage tank 2. After entering the first storage tank 2, the quenching oil is allowed to settle for approximately 30 minutes. The purpose of this settling is to allow suspended impurities in the quenching oil to settle to the bottom of the first storage tank 2, thus obtaining the supernatant and impurities. The bottom of the first storage tank 2 is equipped with a first drain port 24 for discharging impurities. The oil suction assembly 1 draws the quenching oil into the first storage tank 2 at a rate of 50–200 L / min.

[0044] S4. The first quenching oil supernatant is transferred to the second oil storage tank 3 for static settling to obtain the second quenching oil supernatant and impurities.

[0045] The side wall of the first oil storage tank 2 is equipped with a primary oil inlet valve 22 and a secondary oil inlet valve 23. The primary oil inlet valve 22 is selectively opened to transport the first quenching oil supernatant to the second oil storage tank 3. During this process, the filter unit 41 is still located at the top of the second oil storage tank 3. The bottom of the filter unit 41 and the second oil storage tank 3 form a first cavity. The first quenching oil supernatant is transported into the first cavity and left to stand for about 10 minutes to allow suspended impurities in the first quenching oil supernatant to settle, resulting in a separated second quenching oil supernatant and impurities.

[0046] S5. Move the filter unit 41 toward the second quenching oil supernatant, so that the second quenching oil supernatant is filtered by the filter unit 41 to obtain filtered quenching oil and oil stains. Then, discharge the filtered quenching oil to the oil tank 71 and discharge the oil stains to the oil stain storage tank 6.

[0047] The filter unit 41 is moved towards the bottom of the second oil storage tank 3. The top of the filter unit 41 and the second oil storage tank 3 form a second cavity. The supernatant of the second quenching oil is filtered through the filter unit 41 to obtain filtered quenching oil, which flows into the second cavity and then back to the oil tank 71 via the recovery pipe 32 and the recovery pump 5. After filtration through multiple layers of filter screens, impurities of different particle sizes are intercepted between each layer of filter screens and between the filter screens and the bottom of the second oil storage tank 3. The first drain valve 35 and the second drain valve 36 are opened, and the impurities can be discharged to the oil storage tank 6 through the first drain pipe 33 and the second drain pipe 34, respectively. The descent speed of the filter unit 41 is 10-50 mm / s to ensure that the quenching oil slowly passes through the filter unit 41. In one possible embodiment, the filter assembly is driven by a cylinder, and the descent speed of the filter assembly can be adjusted by a speed control valve.

[0048] During the filtration process, the primary inlet valve 22 and the secondary inlet valve 23 are selectively opened based on the liquid level of the supernatant of the second quenching oil in the second oil storage tank 3. At the beginning of filtration, the primary inlet valve 22 is activated first. Once oil overflow is observed in the overflow container 31 of the second oil storage tank 3, the primary inlet valve 22 is closed. Alternatively, the primary inlet valve 22 can be automatically closed using the oil level switch SW and the flow switch SW. Subsequently, the filter assembly 4 operates to filter the supernatant of the second quenching oil, obtaining filtered quenching oil and impurities. When the filter unit 41 descends to the bottom of the second oil storage tank 3, the recovery pump 5 is activated to pump the filtered quenching oil back to the oil tank 71. The primary inlet valve 22 is then reopened, and the filtration process is repeated until the oil in the primary inlet valve 22 stops flowing. After confirming that the oil supplied to the second oil storage tank 3 through the primary inlet valve 22 has not reached the preset liquid level (the liquid level is visible in the overflow container 31), the secondary inlet valve 23 is opened, and the filtration operation is repeated. The oil supplied via the primary inlet valve 22 contains relatively few suspended impurities, therefore there is no need to open the drain valve of the second storage tank 3. The first drain valve 35 and the second drain valve 36 are opened when the oil supply to the first storage tank 2 ends.

[0049] The relative position of the oil suction port 11 within the oil tank 71 is changed, and the cleaning operation is repeated. The operation status is monitored throughout, and the number of cycles is reassessed and adjusted based on the amount of oil collected. The filtration method provided by this invention does not require removing all the quenching oil from the oil tank 71. Instead, it primarily adjusts the position of the oil suction port 11 within the oil tank 71 to remove as much oil and sludge as possible from the bottom. After multiple rounds of operation are completed, the bottom flange of the second oil storage tank 3 is then disassembled.

[0050] The above description is only a preferred embodiment of the present invention. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the technical principles of the present invention, and these improvements and modifications should also be considered within the scope of protection of the present invention.

Claims

1. A quenching oil cleaning device, characterized in that, It includes an oil suction assembly (1), a first oil storage tank (2), a second oil storage tank (3), a filter assembly (4), and a recovery pump (5); The oil suction component (1) is attached to the bottom of the oil tank (71) and is connected to the first oil storage tank (2); the first oil storage tank (2) is connected to the second oil storage tank (3), and the second oil storage tank (3) is connected to the recovery pump (5); The filter assembly (4) includes a filter unit (41), which is slidably connected to the inner wall of the second oil storage tank (3); When the filter assembly (4) is not working, the filter unit (41) slides to the top of the second oil storage tank (3), and the bottom of the filter unit (41) and the second oil storage tank (3) form a first cavity for storing the quenching oil to be filtered. When the filter assembly (4) is working, the filter unit (41) moves toward the quenching oil to be filtered in the first cavity. The top of the filter unit (41) and the second oil storage tank (3) form a second cavity for storing the filtered quenching oil.

2. The quenching oil cleaning device according to claim 1, characterized in that, The oil suction assembly (1) includes an oil suction port (11), an oil suction pipe (12), and an oil suction pump (13). One end of the oil suction pipe (12) is connected to the oil suction port (11) and extends into the oil cooling chamber (7). The other end is connected to the first oil storage tank (2) through the oil suction pump (13). A magnet (14) is provided on the side of the oil suction port (11) facing the oil tank (71). The magnet (14) is attracted to the bottom of the oil tank (71).

3. The quenching oil cleaning device according to claim 1, characterized in that, An overflow valve (21) is provided on the top of the side wall of the first oil storage tank (2). The side wall of the first oil storage tank (2) is connected to the bottom of the second oil storage tank (3) through a first-level oil inlet valve (22) and a second-level oil inlet valve (23). A first drain outlet (24) is provided at the bottom of the first oil storage tank (2).

4. The quenching oil cleaning device according to claim 1, characterized in that, The filter assembly (4) further includes a cylinder (42) and a piston rod (43). The filter unit (41) includes a first filter element (411), a second filter element (412), a third filter element (413), and a filter element connecting rod (414). One end of the piston rod (43) is connected to the inside of the cylinder (42), and the other end extends into the second oil storage tank (3) and is connected to one end of the filter element connecting rod (414). The first filter element (411), the second filter element (412), and the third filter element (413) are sequentially sleeved on the other end of the filter element connecting rod (414) from bottom to top. The outer walls of the first filter element (411), the second filter element (412), and the third filter element (413) are slidably connected to the inner wall of the second oil storage tank (3). The cylinder (42) is installed on the top of the second oil storage tank (3).

5. The quenching oil cleaning device according to claim 4, characterized in that, The first filter element (411) is made of metal mesh, and the filtration accuracy of the first filter element (411) is 20~100 µm; And / or, the second filter element (412) is made of either a multilayer metal filter or a sintered metal filter, and the filtration accuracy of the second filter element (412) is 5 ~ 30 µm; And / or, the third filter element (413) is a laminated sintered metal filter screen, and the filtration accuracy of the third filter element (413) is 1~10 µm.

6. The quenching oil cleaning device according to claim 4, characterized in that, The second oil storage tank (3) has an overflow container (31) on the top of its side wall and an oil sludge storage tank (6) at the bottom. The bottom of the side wall of the second oil storage tank (3) is connected in the vertical direction to one end of a recovery pipe (32), a first drain pipe (33), and a second drain pipe (34). The other end of the recovery pipe (32) is connected to the recovery pump (5). The recovery pump (5) is connected to an oil tank (71) and is used to discharge the filtered quenching oil to the oil tank (71). The other ends of the first drain pipe (33) and the second drain pipe (34) are respectively directed toward the oil sludge storage tank (6) and are used to discharge the filtered oil sludge into the oil sludge storage tank (6).

7. The quenching oil cleaning device according to claim 6, characterized in that, When the filter unit (41) slides to the bottom of the second oil storage tank (3), the top of the third filter element (413) and the cavity formed by the second oil storage tank (3) are connected to the recovery pipe (32). The cavity formed by the second filter element (412), the third filter element (413) and the second oil storage tank (3) are connected to the first drain pipe (33) through the first drain valve (35). The cavity formed by the first filter element (411), the second filter element (412) and the second oil storage tank (3) are connected to the second drain pipe (34) through the second drain valve (36).

8. A method for cleaning quenching oil using the quenching oil cleaning device according to any one of claims 1 to 7, characterized in that, include: Open and allow the heat treatment furnace to stand still; After the settling period is over, install and start the oil suction assembly (1), and move the filter unit (41) to the top of the second oil storage tank (3); Quenching oil is drawn into the first oil storage tank (2), and allowed to settle to obtain the first quenching oil supernatant and impurities; The first quenching oil supernatant is transported to the second oil storage tank (3) and allowed to settle to obtain the second quenching oil supernatant and impurities; Move the filter unit (41) toward the second quenching oil supernatant, so that the second quenching oil supernatant is filtered by the filter unit (41) to obtain the filtered quenching oil and impurities, discharge the filtered quenching oil to the oil tank (71), and discharge the impurities to the oil storage tank (6). Adjust the position of the oil suction component (1) and repeat the suction, settling and filtration process.

9. The quenching oil cleaning method according to claim 8, characterized in that, The oil suction component (1) draws the quenching oil into the first oil storage tank (2) at a rate of 50 to 200 L / min.

10. The quenching oil cleaning method according to claim 8, characterized in that, The moving speed of the filter unit (41) towards the second quenching oil supernatant is 10-50 mm / s.

Images