Multi-stage filtering device for waste mineral oil

Abstract

The invention relates to the technical field of filtering, and particularly provides a waste mineral oil multi-stage filtering device which comprises a filtering tank, a filtering plate and a plurality of filtering assemblies. To-be-filtered waste mineral oil is contained in the filtering tank, and an oil outlet is formed in the bottom end of the filtering tank. The filter plate is arranged at the bottom of the filter tank and is positioned above the oil outlet. The multiple filtering assemblies are stacked above the filtering plate in the vertical direction. Each filtering assembly is in a round cake shape and comprises a supporting frame and filtering cloth wrapping the supporting frame; wherein the support frame is provided with a sliding assembly, and the sliding assembly is configured to move along the support frame so as to push the filter cloth. According to the scheme, the movable sliding assembly is arranged on the supporting frame in the filter cloth, and the filter cloth is pushed by the sliding assembly, so that the form of the filter cloth is continuously changed, the hardening risk of oil residues accumulated on the filter cloth is reduced, the filtering efficiency of the device is improved, and the filtering effect is ensured.

Description

Technical Field

[0001] The present invention relates to the technical field of filtration, and particularly to a multi-stage filtration device for waste mineral oil. Background Art

[0002] When recycling waste mineral oil, it needs to be processed through multiple processes such as oil-water separation, filtration, sedimentation, and heating. During the filtration process, to ensure the filtration effect, multi-stage filtration is usually carried out. However, during the filtration process, impurities such as oil residues in the waste mineral oil are likely to accumulate and form a hard crust on the filter cloth, resulting in blockage of the filter cloth, which not only seriously affects the filtration effect and efficiency but also is difficult to clean, increasing the cleaning cost. Summary of the Invention

[0003] The object of the present invention is to reduce the risk of filter cloth blockage and improve the filtration efficiency.

[0004] Specifically, the present invention provides a multi-stage filtration device for waste mineral oil, including: a filtration tank, which internally accommodates the waste mineral oil to be filtered, and has an oil outlet at its bottom end; a filter plate, arranged at the bottom of the filtration tank and above the oil outlet; a plurality of filtration components, stacked vertically above the filter plate; each filtration component is in a disc shape, and each filtration component includes a support frame and a filter cloth covering the support frame; wherein, a sliding component is arranged on the support frame, and the sliding component is configured to move along the support frame to push the filter cloth.

[0005] Further, the support frame is bent on the horizontal plane and is connected end to end.

[0006] Further, the support frame is configured to be in a vortex shape.

[0007] Further, the sliding component includes: a sliding ring, sleeved on the support frame and configured to slide along the support frame; an elastic piece, sleeved on the outside of the sliding ring for pushing the filter cloth; a connecting rod, arranged between the sliding ring and the elastic piece for connecting the sliding ring and the elastic piece.

[0008] Further, the sliding component further includes: a first roller, rotatably arranged on the sliding ring and abutted against the support frame; a driving element, arranged on the sliding ring and connected to the first roller for driving the first roller to rotate.

[0009] Further, the sliding component further includes: a second roller, rotatably arranged on the sliding ring and abutted against the support frame; wherein, the axis of the second roller and the axis of the first roller are staggered.

[0010] Further, the elastic piece is configured to be in an olive shape.

[0011] Further, the bottom wall of the filtration tank is in a funnel shape, and the oil outlet is arranged at the bottommost end of the bottom wall.

[0012] Furthermore, the multi-stage filtration device for waste mineral oil further includes a pressurizing assembly for pressurizing the inside of the filtration tank.

[0013] Furthermore, a connecting piece is arranged on the filter cloth, and the connecting piece is communicated with a connecting pipe to discharge part of the filtrate inside the filter cloth out of the filtration tank.

[0014] The beneficial effects of the present invention are as follows: For the multi-stage filtration device for waste mineral oil of the present invention, by arranging a movable sliding assembly on the support frame inside the filter cloth and using the sliding assembly to push the filter cloth, the shape of the filter cloth is continuously changed, thereby reducing the risk of the filter cloth being blocked due to the hardening of oil residues on the filter cloth, further improving the filtration efficiency of the device and ensuring the filtration effect. In addition, since the oil residues are not easily hardened on the filter cloth, the cleaning difficulty of the filter cloth is also reduced.

[0015] Furthermore, for the multi-stage filtration device for waste mineral oil of the present invention, the support frame is arranged to be connected end to end, so that when the sliding assembly moves on the support frame, it can move cyclically along the support frame, thereby ensuring the pushing effect of the sliding assembly on the filter cloth and improving the filtration efficiency.

[0016] Furthermore, for the multi-stage filtration device for waste mineral oil of the present invention, the component in the sliding assembly for pushing the filter cloth is set as an elastic sheet, and by using the characteristics of its elastic material, while ensuring the pushing effect on the filter cloth, the risk of wear and rupture of the filter cloth is reduced. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Some specific embodiments of the present invention will be described in detail hereinafter with reference to the drawings in an exemplary but non-limiting manner. The same reference numerals in the drawings denote the same or similar components or parts. In the drawings: Figure 1 is a schematic structural diagram of a multi-stage filtration device for waste mineral oil according to an embodiment of the present invention; Figure 2 is a schematic structural diagram of the multi-stage filtration device for waste mineral oil according to an embodiment of the present invention from another angle; Figure 3 is a schematic cross-sectional view taken along the cutting line A-A in Figure 2 ; Figure 4 is Figure 3 a schematic enlarged view of the area B in Figure 5 is a schematic structural diagram of a filtration assembly according to an embodiment of the present invention; Figure 6 is a schematic cross-sectional view taken along the cutting line C-C in Figure 5 ; Figure 7 is Figure 6Schematic enlarged view of the middle region D; Figure 8 is Figure 6 Schematic enlarged view of the middle region E; Figure 9 It is a schematic structural diagram of another angle of the filter assembly according to an embodiment of the present invention; Figure 10 is along Figure 9 Schematic cross-sectional view taken along the section line F-F in; Figure 11 It is a schematic structural diagram of the sliding assembly according to an embodiment of the present invention; Figure 12 is along Figure 11 Schematic cross-sectional view taken along the section line G-G in; Figure 13 It is a schematic structural diagram of the slip ring and the connecting rod according to an embodiment of the present invention; Figure 14 It is a schematic structural diagram of the elastic piece according to an embodiment of the present invention.

[0018] Wherein: 100, filter tank; 110, oil outlet; 120, support plate; 130, base; 131, first oil discharge pipe; 132, second oil discharge pipe; 140, bottom wall; 150, end cover; 151, locking block; 152, high-pressure air inlet; 153, pressure relief port; 154, pressure gauge; 160, oil outlet pipe; 170, third oil discharge pipe; 180, switch; 200, filter plate; 300, filter assembly; 310, support frame; 320, filter cloth; 330, connecting piece; 331, first member; 332, first through hole; 333, second member; 334, second through hole; 335, fastener; 340, connecting pipe; 400, sliding assembly; 410, slip ring; 411, first roller; 412, driving element; 413, second roller; 420, elastic piece; 430, connecting rod; 500, pressurizing assembly; 600, oil delivery assembly; 610, inlet pipe; 620, delivery pipe. Detailed implementation manners

[0019] In order to make the objectives, technical solutions and advantages of the present invention clearer and more understandable, the present invention will be further described in detail below through embodiments and in conjunction with the accompanying drawings. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention.

[0020] In this text, the terms "first" and "second" are only used for descriptive purposes and should not be construed as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features. Thus, features defined with "first" and "second" may explicitly or implicitly include at least one of such features, that is, include one or more of such features. In the description of the present invention, the meaning of "a plurality of" is at least two, such as two, three, etc., unless otherwise specifically defined. When a feature "includes or contains" a certain or certain features it covers, unless otherwise specifically described, this indicates that other features are not excluded and other features may be further included.

[0021] It should be understood that the orientation or positional relationship indicated by the terms "upper", "lower", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the indicated device or element must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as a limitation to the present invention.

[0022] The following refers to Figures 1 to 14 to describe a multi-stage filtration device for waste mineral oil provided by the present invention.

[0023] This embodiment provides a multi-stage filtration device for waste mineral oil. Generally, the multi-stage filtration device for waste mineral oil may include: a filtration tank 100, a filter plate 200, and a plurality of filtration components 300.

[0024] The interior of the filtration tank 100 accommodates the waste mineral oil to be filtered, and an oil outlet 110 is provided at the bottom end of the filtration tank 100. The filter plate 200 is disposed at the bottom of the filtration tank 100 and above the oil outlet 110. A plurality of filtration components 300 are stacked above the filter plate 200 in the vertical direction. Each filtration component 300 is in a disc shape, and each filtration component 300 includes a support frame 310 and a filter cloth 320 covering the support frame 310. Among them, a sliding component 400 is provided on the support frame 310, and the sliding component 400 is configured to move along the support frame 310 to push the filter cloth 320.

[0025] As Figures 3 - 4 shown, after the waste mineral oil passes through the multi-stage filtration of the plurality of filtration components 300 and the filter plate 200, the formed filtrate flows out from the oil outlet 110 at the bottom end of the filtration tank 100. During the filtration process when the waste mineral oil enters from the outside of the filter cloth 320 to the inside of the filter cloth 320, the filter cloth 320 is driven by the flowing waste mineral oil to be close to the support frame 310. At the same time, impurities such as oil residues in the waste mineral oil gradually accumulate on the filter cloth 320. As the oil residues continue to accumulate, the oil residues are prone to caking, resulting in blockage of the filter cloth 320, thereby affecting the filtration effect.

[0026] In the solution of this embodiment, by arranging a sliding component 400 on the support frame 310, the area of the filter cloth 320 corresponding to the sliding component 400 is pushed and supported by the sliding component 400. The sliding component 400 is configured to move along the support frame 310, so that the area of the filter cloth 320 that is pushed and supported continuously changes as the sliding component 400 moves. The continuous change in the shape of the filter cloth 320 makes it difficult for impurities such as oil residue accumulated on the filter cloth 320 to form lumps, thereby reducing the risk of blockage of the filter cloth 320, ensuring the filtering effect, and improving the filtering efficiency.

[0027] As Figures 3 - 4 shown, an annular support plate 120 can be arranged at the bottom of the filter tank 100. The support plate 120 extends from the inner wall surface of the side wall of the filter tank 100 into the interior of the filter tank 100 to support the filter plate 200. The filter plate 200 is directly placed on the support plate 120, which not only has a stable structure but also is convenient for installation and disassembly, reducing the subsequent cleaning difficulty. A base 130 can be arranged below the filter tank 100 to support the filter tank 100. A first oil discharge pipe 131 can be arranged on the base 130, and the first oil discharge pipe 131 is connected to the oil outlet 110 to discharge the filtered liquid to the outside. In some embodiments, the base 130 and the filter tank 100 can be integrally formed.

[0028] The support frame 310 is bent and arranged on the horizontal plane and is connected end to end.

[0029] In the solution of this embodiment, the support frame 310 is bent, increasing the moving path of the sliding component 400 and the range of the area of the filter cloth 320 that the sliding component 400 can push, further reducing the risk of blockage of the filter cloth 320 and improving the filtering effect.

[0030] The support frame 310 is arranged to be connected end to end, so that the sliding component 400 can continuously move in a cycle on the support frame 310, thus ensuring the pushing effect. And there is no problem of turning around. Moving in one direction, the operation is more stable, and the pushing efficiency is higher and the effect is better.

[0031] The support frame 310 is configured to be a vortex shape.

[0032] In the solution of this embodiment, the support frame 310 is configured to be a vortex shape that is more adapted to the round cake shape of the filter cloth 320, maximizing the area that the sliding component 400 can push. Moreover, the bending arc of the vortex-shaped support frame 310 is smaller, making the movement of the sliding component 400 smoother and improving the pushing efficiency.

[0033] The sliding assembly 400 generally may include: a slip ring 410, a spring piece 420, and a connecting rod 430. The slip ring 410 is sleeved on the support frame 310 and is configured to slide along the support frame 310. The spring piece 420 is sleeved on the outer side of the slip ring 410 and is used to push the filter cloth 320. The connecting rod 430 is disposed between the slip ring 410 and the spring piece 420 and is used to connect the slip ring 410 and the spring piece 420.

[0034] In the solution of this embodiment, the structure in the sliding assembly 400 that directly contacts the filter cloth 320 is set as the spring piece 420. By using its elastic property, the wear risk of the filter cloth 320 is reduced and the service life of the filter cloth 320 is improved. The spring piece 420 may preferably be made of an elastic metal material, which not only has good elasticity and recovery ability but also has good corrosion resistance.

[0035] The structure of the sliding assembly 400 is set to two layers, an inner layer is the slip ring 410 sleeved on the support frame 310, and an outer layer is the spring piece 420 in contact with the filter cloth 320. And the slip ring 410 and the spring piece 420 are connected by the connecting rod 430. While ensuring that the spring piece 420 can move synchronously with the slip ring 410, a gap exists between the slip ring 410 and the spring piece 420, and the spring piece 420 can deform relative to the slip ring 410. When the pressure from the filter cloth 320 on the spring piece 420 is relatively large, the spring piece 420 becomes flattened, and the contact area between the spring piece 420 and the filter cloth 320 increases, thereby reducing the unit contact stress between the spring piece 420 and the filter cloth 320. Furthermore, while ensuring the pushing effect of the spring piece 420 on the filter cloth 320, the wear and rupture risk of the filter cloth 320 is reduced.

[0036] In some preferred embodiments, the slip ring 410 and the spring piece 420 may be connected only by one connecting rod 430, so as to increase the deformable range of the spring piece 420 while ensuring that the spring piece 420 can move synchronously with the slip ring 410, and make the deformation of the spring piece 420 smoother. The connecting rod 430 and the slip ring 410 may be fixedly connected or integrally formed, and the connecting rod 430 and the spring piece 420 may be snap-connected together, thereby reducing the installation difficulty. An opening may be formed on the slip ring 410, and the slip ring 410 is preferably made of a material that has both rigidity and elasticity, thereby reducing the installation and disassembly difficulty of the slip ring 410 while ensuring its structural stability.

[0037] As Figure 7 shown, in some embodiments, the sliding assembly 400 generally may further include a first roller 411 and a driving element 412. The first roller 411 is rotatably disposed on the slip ring 410 and abuts against the support frame 310. The driving element 412 is disposed on the slip ring 410 and is connected to the first roller 411 for driving the first roller 411 to rotate.

[0038] In the solution of this embodiment, by providing a first roller 411 on the slip ring 410 that abuts against the support frame 310, and driving the first roller 411 to rotate by a driving element 412, the slip ring 410 is driven to move along the support frame 310. The first roller 411 is preferably provided on the upper half of the slip ring 410, and the connecting rod 430 is preferably provided on the lower half of the slip ring 410, so that the self-weight of the slip ring 410 enables the first roller 411 to better abut against the support frame 310, reducing the risk of slipping of the first roller 411. The driving element 412 can preferably be set as a motor, such as a submersible motor.

[0039] In some other embodiments, the sliding assembly 400 can be magnetic. An electromagnetic device can be provided on the support frame 310, and the electromagnetic device can be intermittently energized forward and backward, thereby generating a suction force or a repulsive force to attract or push the sliding assembly 400 to move on the support frame 310.

[0040] As Figure 7 shown, in some embodiments, the sliding assembly 400 generally further includes a second roller 413. The second roller 413 is rotatably provided on the slip ring 410 and abuts against the support frame 310; wherein, the axis of the second roller 413 and the axis of the first roller 411 are staggered.

[0041] In the solution of this embodiment, the first roller 411 and the second roller 413 with staggered axes are simultaneously provided on the slip ring 410, so that there is a certain gap between the slip ring 410 and the support frame 310 under the common support of the first roller 411 and the second roller 413, thereby reducing the frictional resistance between the slip ring 410 and the support frame 310 when the slip ring 410 moves, making the movement of the slip ring 410 smoother and improving the structural stability.

[0042] As Figure 7 shown, in some embodiments, the cross-section of the support frame 310 is rhombic, and one of the diagonals is vertically arranged. The slip ring 410 is set to a matching rhombus shape with an opening formed at its top. The upper half of the slip ring 410 is respectively provided with a rotatable first roller 411 and a second roller 413, and the first roller 411 and the second roller 413 are located at both ends of the opening and respectively abut against two prism faces of the support frame 310.

[0043] In some preferred embodiments, the elastic piece 420 is configured to be olive-shaped.

[0044] As Figures 11 - 12 shown, the elastic piece 420 is composed of two curved surfaces symmetrical with respect to the horizontal plane, and the two curved surfaces can be connected together by welding. The olive-shaped shape formed by the elastic piece 420 can effectively reduce the resistance between the elastic piece 420 and the filtrate during movement, thereby improving the movement efficiency of the elastic piece 420 and further reducing the risk of blockage of the filter cloth 320.

[0045] The bottom wall 140 of the filtration tank 100 is funnel-shaped, and the oil outlet 110 is arranged at the bottommost end of the bottom wall 140.

[0046] In the solution of this embodiment, the bottom wall 140 of the filtration tank 100 is arranged to be funnel-shaped, and the oil outlet 110 is arranged at the bottommost end of the bottom wall 140. The gravity of the mineral oil itself is utilized to assist the flow of the mineral oil, thereby improving the discharge efficiency of the mineral oil. In addition, before cleaning the filtration component 300, it is necessary to first discharge the mineral oil in the filtration tank 100. The funnel-shaped bottom wall 140 can reduce the residual risk of the mineral oil in the filtration tank 100, and improve the evacuation effect and evacuation efficiency.

[0047] The multi-stage filtration device for waste mineral oil generally may further include a pressurizing component 500. The pressurizing component 500 is used to pressurize the inside of the filtration tank 100.

[0048] In the solution of this embodiment, by arranging the pressurizing component 500 to pressurize the inside of the filtration tank 100, the flow efficiency of the mineral oil is improved, and further the filtration efficiency is improved. The pressurizing component 500 can be arranged on the base 130, and preferably the pressurizing component 500 can be arranged as an air pump. The top end of the filtration tank 100 is provided with a detachable end cover 150, and the end cover 150 seals the filtration tank 100 under the action of a plurality of locking blocks 151. The end cover 150 is provided with a high-pressure air inlet 152 connected to the air pump, a pressure relief port 153 for pressure relief, and a pressure gauge 154.

[0049] A connecting piece 330 is arranged on the filter cloth 320, and the connecting piece 330 is communicated with a connecting pipe 340 to discharge part of the filtrate in the filter cloth 320 out of the filtration tank 100.

[0050] In the solution of this embodiment, by arranging the connecting piece 330 on the filter cloth 320 and arranging the connecting pipe 340 communicated with the outside on the connecting piece 330, part of the filtrate in the filter cloth 320 is discharged out of the filtration tank 100 through the connecting pipe 340, increasing the discharge path of the filtrate, and further improving the filtration efficiency.

[0051] Such as Figure 8As shown, the connecting member 330 includes a first member 331 and a second member 333. The first member 331 and the second member 333 are respectively located on the inner and outer sides of the filter cloth 320 and jointly clamp the filter cloth 320. A first through hole 332 is formed on the first member 331 located on the outer side of the filter cloth 320, and a second through hole 334 is formed on the second member 333 located on the inner side. One end of the first through hole 332 is connected to the connecting pipe 340, and the other end is opposite to the second through hole 334. The filtrate in the filter cloth 320 passes through the second through hole 334, then flows through the first through hole 332, and finally flows into the connecting pipe 340. In some embodiments, the first member 331 and the second member 333 can be connected by fasteners 335 (such as screws, studs, etc.). In other embodiments, the first member 331 and the second member 333 can be directly snap-connected together, and a sealing ring can be provided between the first member 331 and the second member 333.

[0052] As Figure 8 shown, a plurality of oil outlet pipes 160 are provided on the outer side of the filtration tank 100 and are respectively connected to the plurality of connecting pipes 340 in one-to-one correspondence. A second oil discharge pipe 132 can be provided on the base 130, and each oil outlet pipe 160 leads to the second oil discharge pipe 132. The filtrates produced by different filtration paths are respectively discharged from the first oil discharge pipe 131 and the second oil discharge pipe 132, which is convenient for subsequent classification treatment. A third oil discharge pipe 170 is further provided at the bottom of the filtration tank 100. The third oil discharge pipe 170 is located above the filter plate 200 and is used to discharge the unfiltered waste mineral oil before cleaning the filter cloth 320.

[0053] A oil delivery assembly 600 is further provided on the base 130. One end of the oil delivery assembly 600 is connected to the filtration tank 100 through an oil delivery pipe 620, and the other end is connected to the outside through an oil inlet pipe 610. The waste mineral oil flows through the oil inlet pipe 610 to the oil delivery assembly 600, and then under the action of the oil delivery assembly 600, flows into the filtration tank 100 through the oil delivery pipe 620. The oil delivery assembly 600 is preferably provided as an oil pump. A switch 180 can be provided on the base 130 to control the start and stop of the air pump and the oil pump.

[0054] In some preferred embodiments, a control valve for controlling the on-off of the pipeline can be provided on each of the first oil discharge pipe 131, the second oil discharge pipe 132, the third oil discharge pipe 170, the oil delivery pipe 620 and each oil outlet pipe 160 to control the filtration process of the waste mineral oil.

[0055] Combined with the above embodiments, the specific working process of the multi-stage filtration device for waste mineral oil provided by the present invention is described as follows: When the oil pump is started, the waste mineral oil, under the action of the oil pump, sequentially flows through the oil inlet pipe 610 and the oil delivery pipe 620 and is injected into the filtration tank 100.

[0056] The air pump starts, injecting high-pressure gas into the filter tank 100 through the high-pressure air inlet 152, forcing the waste mineral oil to pass through the filter cloth 320 and enter inside the filter cloth 320. Part of the filtrate inside the filter cloth 320 flows out successively through the connector 330, the connecting pipe 340, the oil outlet pipe 160, and the second oil discharge pipe 132, and another part of the filtrate passes through the multi-layer filter cloth 320 and the filter plate 200 and then flows to the bottom end of the filter tank 100, and then flows out through the oil outlet 110 and the first oil discharge pipe 131.

[0057] During the filtering process, the driving element 412 drives the first roller 411 to roll, enabling the slip ring 410 to move along the support frame 310, thereby driving the elastic piece 420 to move and continuously push against the filter cloth 320. The filter cloth 320 continuously deforms, thus reducing the risk of caking of the oil residue on the filter cloth 320 and the risk of blockage of the filter cloth 320, and further ensuring the filtering effect and improving the filtering efficiency. As impurities such as oil residue on the filter cloth 320 continuously accumulate and the pressure inside the filter tank 100 rises, the pressing force of the filter cloth 320 against the elastic piece 420 gradually increases. The elastic piece 420 deforms under the pressing of the filter cloth 320 and gradually approaches the support frame 310. After the elastic piece 420 becomes flattened, the contact area between the elastic piece 420 and the filter cloth 320 increases, and the unit contact stress becomes smaller, thereby reducing the risk of wear and rupture of the filter cloth 320 while ensuring the pushing effect of the elastic piece 420 on the filter cloth 320.

[0058] After the filtering is completed, after the liquid in the filter tank 100 is completely discharged through the first oil discharge pipe 131, the second oil discharge pipe 132, and the third oil discharge pipe 170, the end cover 150 of the filter tank 100 is opened, and the filter assembly 300 and the filter plate 200 are taken out to clean the oil residue attached thereto.

[0059] The technical features of the above embodiments can be combined arbitrarily. For the sake of brief description, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, it should be considered as the scope described in this specification.

[0060] The above-described embodiments only represent several implementation manners of the present invention. Their descriptions are relatively specific and detailed, but they should not be construed as limiting the scope of the present invention. It should be noted that for those of ordinary skill in the art, without departing from the concept of the present invention, several deformations and improvements can still be made, and these all belong to the protection scope of the present invention. Therefore, the protection scope of the present invention should be subject to the appended claims.

Claims

1. A multi-stage filtration device for waste mineral oil, characterized in that Comprising: A filtering tank, which contains waste mineral oil to be filtered inside, and an oil outlet is arranged at the bottom end thereof; A filter plate, which is arranged at the bottom of the filtering tank and above the oil outlet; A plurality of filtering components, which are stacked above the filter plate in the vertical direction; each filtering component is in a disc shape, and each filtering component includes a support frame and a filter cloth covering the support frame; wherein, a sliding component is arranged on the support frame, and the sliding component is configured to move along the support frame to push the filter cloth.

2. The multi-stage filtering device for waste mineral oil according to claim 1, wherein The support frame is bent and arranged on the horizontal plane and is connected end to end.

3. The multi-stage filtering device for waste mineral oil according to claim 2, wherein The support frame is configured to be in a vortex shape.

4. The multi-stage filtration device for waste mineral oil according to claim 1, wherein The sliding component includes: A sliding ring, which is sleeved on the support frame and is configured to slide along the support frame; A spring piece, which is sleeved on the outside of the sliding ring and is used to push the filter cloth; A connecting rod, which is arranged between the sliding ring and the spring piece and is used to connect the sliding ring and the spring piece.

5. The multi-stage filtration device for waste mineral oil according to claim 4, characterized in that, The sliding component further includes: A first roller, which is rotatably arranged on the sliding ring and abuts against the support frame; A driving element, which is arranged on the sliding ring and is connected to the first roller and is used to drive the first roller to rotate.

6. The multi-stage filtration device for waste mineral oil according to claim 5, characterized in that, The sliding component further includes: A second roller, which is rotatably arranged on the sliding ring and abuts against the support frame; wherein, the axis of the second roller and the axis of the first roller are staggered.

7. The multi-stage filtering device for waste mineral oil according to claim 4, wherein The spring piece is configured to be in an olive shape.

8. The multi-stage filtering device for waste mineral oil according to claim 1, wherein The bottom wall of the filtering tank is in a funnel shape, and the oil outlet is arranged at the bottommost end of the bottom wall.

9. The multi-stage filtration device for waste mineral oil according to claim 1, wherein Further comprising: A pressurizing component, which is used to pressurize the inside of the filtering tank.

10. The multi-stage filtering device for waste mineral oil according to claim 1, wherein A connecting piece is arranged on the filter cloth, and the connecting piece is communicated with a connecting pipe to partially discharge the filtered liquid inside the filter cloth out of the filtering tank.

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