Impurity removal, separation and recovery system for waste mineral oil

Abstract

The invention relates to the technical field of separation equipment, and discloses a waste mineral oil impurity removal, separation and recovery system which comprises a rotary drum component, the rotary drum component is composed of a rotary drum large end and a rotary drum small end which are fixedly connected, and an auxiliary deslagging structure is arranged outside a spiral main shaft located at the rotary drum small end. The auxiliary deslagging structure comprises a sleeve arranged on the outer surface of a circular shaft of the spiral main shaft in a sleeving mode, and a sliding groove in sliding connection with the outer wall of the spiral main shaft is formed in the sleeve. An auxiliary deslagging structure is arranged, oil residue particles do spiral motion along the inner wall of the rotary drum component under the combined action of centrifugal force and spiral thrust, meanwhile, radial pulsation is generated due to reciprocating motion of auxiliary blades, a combined track of spiral advancing and radial oscillation is formed, an oil film structure is damaged through dynamic extrusion, leaked oil is recovered through centrifugal suction, and the oil residue removal effect is improved. And through the synergistic effect of variable-volume extrusion and filtering gaps, oil wrapping is reduced, the oil stripping effect is enhanced, oil residue residues are reduced, and channel blockage is avoided.

Description

Technical Field

[0001] The present invention relates to the technical field of separation equipment, and in particular to a waste mineral oil impurity removal, separation and recovery system. Background Art

[0002] The impurity removal, separation, and recycling of waste mineral oils (such as waste engine oil, waste hydraulic oil, and waste lubricating oil) is a critical environmental and resource recycling process. The equipment and technology used are designed to effectively remove impurities such as moisture, solid particles (metal shavings, dust), colloids, asphaltene, and aged additives from the oil, restoring its essential properties (typically for reuse as fuel or base oil). Ideally, the centrifugal force generated by the high-speed rotation of a decanter centrifuge can theoretically effectively separate the oil, water, and solid phases. Density differences cause the oil phase (the lightest) to concentrate in the center of the bowl, while the solid phase (the heaviest) adheres to the walls. The spiral blades push the solid phase toward the discharge port, while the oil phase is discharged through the overflow port.

[0003] In the actual production of waste mineral oil treatment by horizontal screw centrifuge, there is a phenomenon that solid particles wrap the oil, resulting in an increase in the oil content of the slag. This is due to the lipophilic surface, porous structure and small particle size of the solid particles, which cause strong adsorption and retention effects on the oil. In addition, insufficient centrifugal force and short solid residence time all lead to insufficient kinetic conditions for solid-oil separation. In the slag discharge process, the oil in the residue is not further stripped off, which directly causes a decrease in the oil recovery rate. The decrease in the oil recovery rate directly leads to waste of raw materials. The cost of waste slag treatment rises sharply due to excessive oil content. The high viscosity of the oily waste slag accelerates the wear of the spiral blades, causes scaling and clogging of the drum, shortens the equipment cleaning cycle, and reduces operating efficiency. At the same time, there are potential environmental pollution risks. Subsequent distillation, refining and other processes need to be overloaded, and energy consumption increases significantly, seriously affecting the stability and economy of the production system. Summary of the Invention

[0004] Technical problems solved In view of the above-mentioned shortcomings of the prior art, the present invention provides a waste mineral oil impurity removal, separation and recovery system, which can effectively solve the problem in the prior art that solid phase particles encapsulate oil and lead to increased oil content in discharged slag.

[0005] To achieve the above objectives, the present invention is implemented through the following technical solutions: The present invention provides a waste mineral oil impurity removal, separation and recovery system, comprising: The drum component is composed of a large drum end and a small drum end that are fixedly connected. The drum component generates a centrifugal field through high-speed rotation, so that the oil, water and solid phases in the waste mineral oil are separated according to density differences; A spiral component is located in the internal cavity of the drum component and pushes the solid slag particles toward the slag discharge port through differential rotation. The spiral component includes a spiral main shaft; An auxiliary slag discharge structure is provided on the outside of the spiral main shaft located at the small end of the drum. The auxiliary slag discharge structure includes a sleeve sleeved on the outer surface of the spiral main shaft. A sliding groove is provided inside the sleeve and is slidably connected to the outer wall of the spiral main shaft. When the spiral main shaft rotates, the sleeve is driven to perform axial reciprocating motion. Wherein, an auxiliary blade is fixedly connected to the outside of the sleeve, and the outer wall of the auxiliary blade is provided with a constraint component that changes diameter as the sleeve moves back and forth.

[0006] Furthermore, the outer wall of the spiral main shaft is fixedly connected with a spiral blade, and a protruding slider is fixedly connected between adjacent spiral blades, and the protruding slider is embedded in the inner wall of the sliding groove.

[0007] Furthermore, the chute is composed of intersecting curved grooves, and the curved grooves are designed in a trapezoidal shape.

[0008] Furthermore, a rib is provided on the side of the sleeve, the outer surface of the rib adopts a slope design, and the inner wall of the rib adopts an L-shaped design.

[0009] Furthermore, a groove is provided on the inner wall of the large end of the drum, and an inclined plate is fixedly connected to one end of the groove close to the large end of the drum.

[0010] Furthermore, the constraint component includes an elastic layer flexibly connected to the outer wall of the auxiliary blade, and the outer wall of the elastic layer is provided with a protrusion that seals and slides with the inner wall of the groove.

[0011] Furthermore, the depth of the groove increases gradually along the direction of the large end of the drum, and the depth ratio of the groove close to the large end of the drum to the groove close to the small end of the drum is 4:3.

[0012] Compared with the prior art, the technical solution provided by the present invention has the following beneficial effects: The present invention is provided with an auxiliary residue discharge structure. Under the combined action of centrifugal force and spiral thrust, the oil residue particles move in a spiral line along the inner wall of the drum component. At the same time, the reciprocating motion of the auxiliary blades generates radial pulsation, forming a composite trajectory of spiral advancement + radial oscillation. Dynamic extrusion destroys the oil film structure, and centrifugal suction recovers the leaked oil. The synergistic effect of variable volume extrusion + filtering gap reduces oil wrapping, enhances the oil stripping effect, reduces oil residue residue, avoids channel blockage, and allows a higher solid load.

[0013] The present invention features a chute, whose unique curved design converts the circular motion of the spiral main shaft into axial reciprocating motion of the sleeve. The sleeve, through a rigid connection, drives the auxiliary blades in synchronous motion, causing them to periodically shift between the spiral blades. The axial reciprocating motion of the auxiliary blades dynamically adjusts the size of the cavity formed by adjacent spiral blades, thereby applying periodic mechanical compression to the oil residue and achieving efficient oil separation.

[0014] The axial reciprocating motion mechanism of the auxiliary blades in the present invention achieves dynamic extrusion and relaxation of the oil residue by periodically changing the accommodation space between the spiral blades. This periodic treatment mechanism effectively breaks the stable structure inside the oil residue through dynamic stress changes. Compared with single extrusion, multiple cycles improve the oil-solid separation efficiency, especially for emulsified oil and high-viscosity oil. Secondly, the dense residue body formed by repeated compression has increased bulk density, reduced fluidity but enhanced overall structural strength, which is more suitable for the conveying characteristics of the spiral component and reduces the risk of clogging of the slag discharge channel. At the same time, the stress release in the relaxation stage can avoid excessive compaction of the oil residue and prevent the slag discharge port from being blocked due to material drying, thereby extending the continuous operation time of the equipment. Finally, the periodic pressure fluctuations form a "pulse slag discharge" effect, so that the oil residue remaining in the cavity at the small end of the drum is effectively pushed out under the action of the pressure difference, the self-cleaning ability of the equipment is improved, and the maintenance cycle is extended. Through this precise periodic regulation, the auxiliary slag discharge structure achieves the coordinated optimization of oil residue separation efficiency, slag discharge smoothness and equipment reliability.

[0015] The present invention is provided with a rib, and the baffle surface is set as an inclined surface, which is tightly attached to the inner wall of the spiral main shaft under the action of centrifugal force to form a dynamic seal; and the inclined surface design not only cleans the residue on the surface of the spiral main shaft when the sleeve moves axially, but also forms a wedge-shaped extrusion area when the volume is reduced, exerting shear stress on the material, so as to break the agglomerated oil residue particles.

[0016] The cross section of the chute of the present invention is designed to be trapezoidal, which not only makes it difficult for intruding particles to settle, but also when oil residue invades, the spiral main shaft generates axial thrust when rotating, which automatically discharges the particles to both ends of the sleeve.

[0017] The present invention incorporates a restraining assembly. As the auxiliary blades move toward the drum's outer end, the elastic layer, flexibly connected to their outer wall, simultaneously drives the protrusions into the grooves. As the groove depth increases toward the drum's outer end, the protrusions gradually embed themselves deeper, forcing the elastic layer to expand radially. During this process, the elastic force generated by the elastic layer forms a dynamic equilibrium with the oil residue pressure, maintaining the contact pressure between the protrusions and the inner wall of the grooves and ensuring that the sealing gap remains at a minimum. When the auxiliary blade moves in the opposite direction to the reset stage, the bump gradually separates from the deeper area of ​​the groove, the elastic layer contracts radially, and the gap returns to the initial design value. During the entire reciprocating motion, the deformation of the elastic layer is linearly related to the change in the groove depth, ensuring the stability of the sealing performance. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] To more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are only some embodiments of the present invention. Those skilled in the art can also derive other drawings based on these drawings without inventive effort.

[0019] Figure 1 Schematic diagram of the overall structure of an embodiment of the present invention; Figure 2 Schematic cross-sectional view of the connection structure of the drum component according to an embodiment of the present invention; Figure 3 This is a schematic structural diagram of a spiral component according to an embodiment of the present invention; Figure 4 A three-dimensional schematic diagram of an auxiliary slag discharge structure according to an embodiment of the present invention; Figure 5 A schematic cross-sectional view of an auxiliary slag discharge structure according to an embodiment of the present invention; Figure 6 This is a schematic diagram of the three-dimensional structure of a groove according to an embodiment of the present invention; Figure 7 Schematic cross-sectional view of a constraint assembly according to an embodiment of the present invention.

[0020] The numbers in the figure represent: 1. Drum component; 11. Small end of the drum; 12. Large end of the drum; 13. Groove; 2. Spiral component; 21. Spiral main shaft; 211. Raised slider; 22. Spiral blade; 3. Auxiliary slag discharge structure; 31. Auxiliary blade; 32. Sleeve; 33. Slide; 34. Side guard; 35. Constraint component; 351. Elastic layer; 352. Bump. DETAILED DESCRIPTION

[0021] To make the purpose, technical solutions, and advantages of the embodiments of the present invention more clear, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making any creative efforts shall fall within the scope of protection of the present invention.

[0022] The present invention will be further described below with reference to the embodiments. Example

[0023] See also Figure 1-Figure 7 The present invention provides a technical solution for waste mineral oil impurity removal, separation and recovery system: refer to Figure 1 、 Figure 2 and Figure 3The equipment includes a drum component 1, a spiral component 2, a differential, a main motor, an auxiliary electrode and a cover component. The main motor and the auxiliary motor drive the drum component 1 and the spiral component 2 to rotate at high speed respectively under the action of the differential. The waste mineral oil slurry enters the spiral component 2 through the feed pipe, and then enters the inner cavity of the drum component 1 after being pre-accelerated by the spiral distributor of the spiral component 2. A plurality of spiral blades 22 are fixedly connected to the outside of the spiral main shaft 21. The pitch of the spiral blades 22 is designed from large to small, and the depth of the spiral groove is designed from shallow to deep, forming a variable pitch compression channel. The oil residue is thrown into the inner cavity of the drum component 1 under the action of centrifugal force, and at the same time is pushed toward the slag discharge port along the spiral blades 22 and discharged from the slag discharge port; under the action of centrifugal force, the oil and water liquid phases separate and flow toward the large end 12 of the drum. The two separated liquid phases are discharged from their respective channels, realizing the separation of oil, water and slag.

[0024] In the field of industrial production, when using a horizontal screw centrifuge to treat waste mineral oil, there will be a situation where solid particles entrain oil, resulting in an increase in the oil content of the slag. The increase in the oil content of the slag directly causes a decrease in the oil recovery rate, resulting in a waste of resources. At the same time, the cost of treating the oily waste slag is greatly increased due to the need for a special disposal process. The high viscosity of the oily waste slag will aggravate the wear of the spiral blades 22, shorten the service life of the equipment, and easily cause scaling and clogging of the drum, increase the frequency of equipment maintenance and downtime for cleaning, and significantly reduce production efficiency. In view of this, the present invention sets an auxiliary slag discharge structure 3 inside the equipment, which further separates the oil contained therein by extrusion during the slag discharge process, and while the auxiliary slag discharge structure 3 assists in oil separation, it also processes dead corners to reduce the accumulation of internal debris.

[0025] refer to Figure 2 、 Figure 3 and Figure 4 The auxiliary slag discharge structure 3 is located in the cavity of the small end 11 of the drum. It includes auxiliary blades 31 arranged in the cavity between the spiral blades 22. A sleeve 32 is fixedly connected to the center of the auxiliary blade 31. A sliding groove 33 is defined on the inner wall of the sleeve 32. A raised slider 211 fixed to the outer wall of the spiral main shaft 21 is embedded in the inner wall of the sliding groove 33, and the two are slidably connected. The sliding groove 33 on the inner wall of the sleeve 32 and the raised slider 211 on the outer wall of the spiral main shaft 21 form a conjugate pair. When the spiral main shaft 21 rotates, the sleeve 32 is constrained by the sliding groove 33 to produce axial reciprocating motion, which drives the auxiliary blade 31 to reciprocate.

[0026] The unique curved design of the chute 33 converts the circular motion of the spiral main shaft 21 into axial reciprocating motion of the sleeve 32. The sleeve 32, through a rigid connection, drives the auxiliary blades 31 to move synchronously, causing the auxiliary blades 31 to periodically shift between the spiral blades 22. The axial reciprocating motion of the auxiliary blades 31 dynamically adjusts the size of the cavity enclosed by adjacent spiral blades 22, thereby applying periodic mechanical compression to the oil residue and achieving efficient oil separation.

[0027] During the oil residue extrusion process, the dynamic change of the cavity size plays a key role. When the auxiliary blade 31 moves forward and enters the compression stage, the length of the cavity surrounded by the adjacent spiral blades 22 and the auxiliary blade 31 is significantly reduced. Due to the radial constraint by the inner wall of the small end 11 of the drum, the cross-sectional area of ​​the cavity remains basically unchanged, which causes the oil residue to be squeezed in the axial direction, the porosity is reduced, and the oil wrapped between the particles is gradually precipitated under the action of shear force. The local high-pressure area formed by the leading edge of the auxiliary blade 31 effectively destroys the oil-solid adsorption structure. When the auxiliary blade 31 moves backward and enters the release stage, the cavity length is restored, the compressed oil residue is temporarily relaxed, and the previously squeezed oil rapidly flows to the liquid phase area of ​​the large end 12 of the drum under the action of centrifugal force. At the same time, the oil residue particles are rearranged in the repeated compression-relaxation process to form a denser skeleton structure, further reducing the oil content.

[0028] During this process, the oil residue undergoes a cyclical treatment process of "extrusion-relaxation". The oil in the oil residue is peeled off from the surface of the solid particles due to shear force and pressure, especially the high-viscosity oil, and the adsorption force between it and the solid particles is destroyed, thereby achieving efficient separation. At the same time, the oil residue itself is compressed under pressure, the porosity between the particles is reduced, and a dense solid aggregate is formed. When the auxiliary blade 31 moves backward, the cavity size increases, and the oil residue enters the relaxation stage. The compressed oil residue obtains a short-term stress release, the particles are rearranged, and the previously separated oil flows toward the large end 12 of the drum under the action of centrifugal force, while the solid particles form agglomerates with a stable structure due to the compression process. This cyclical compression-relaxation effect not only enhances the separation effect of the oil, but also significantly improves the physical properties of the residue.

[0029] After the compression-relaxation treatment, the oil residue has reduced fluidity but enhanced overall structural properties, forming a block or strip shape that is easier to transport, reducing the risk of blockage during the slag discharge process. At the same time, the reduced oil content in the residue weakens its viscosity, reducing the friction with the wall of the slag discharge channel, allowing the auxiliary blades 31 and the spiral blades 22 to more smoothly push the residue to the slag discharge port. In addition, the dense structure formed during the compression process also reduces the amount of residue remaining in the drum component 1, reducing the possibility of accumulation in dead corners within the equipment, helping to improve the equipment's continuous operation time and overall processing efficiency, and reducing the frequency and cost of equipment maintenance.

[0030] The axial reciprocating motion mechanism of the auxiliary blades 31 achieves dynamic extrusion and relaxation of the oil residue by periodically changing the accommodation space between the spiral blades 22. This motion mode is precisely controlled by a conjugate sub-transmission, ensuring that the extrusion-relaxation cycle is synchronized with the oil residue conveying rhythm. During the oil residue processing process, in a single extrusion phase, the auxiliary blades 31 move forward to shorten the axial length of the accommodation space. Due to the coupling of shear force and pressure, the high-viscosity oil overcomes the solid-liquid interfacial tension and detaches from the particle pores and surface. In the relaxation phase, the auxiliary blades 31 move backward, and the spatial volume is restored, which promotes the stress release of the compressed oil residue and the rearrangement of the particles to form a denser skeleton structure. At this time, centrifugal force drives the free oil to migrate to the liquid phase. After multiple cycles of treatment, the oil residue undergoes an iterative process of "compression and oil separation-relaxation and oil removal-recompression and strengthening". Each cycle reduces the oil content, ultimately achieving deep dehydration and oil removal.

[0031] This cyclical treatment mechanism effectively disrupts the stable structure within the oil residue through dynamic stress changes. Compared to single extrusion, multiple cycles improve the oil-solid separation efficiency, especially for emulsified oils and high-viscosity oils. Secondly, the dense residue formed by repeated compression has a higher bulk density, lower fluidity, but enhanced overall structural strength, making it more compatible with the conveying characteristics of the spiral component 2 and reducing the risk of clogging in the slag discharge channel. Simultaneously, stress release during the relaxation phase prevents excessive compaction of the oil residue and blockage of the slag discharge port due to material drying, extending the equipment's continuous operation time. Finally, periodic pressure fluctuations create a "pulse slag discharge" effect, effectively pushing out the oil residue remaining in the cavity of the small end 11 of the drum under the action of the pressure difference, improving the equipment's self-cleaning ability and extending the maintenance cycle. Through this precise cyclical regulation, the auxiliary slag discharge structure 3 achieves the coordinated optimization of oil residue separation efficiency, slag discharge smoothness, and equipment reliability.

[0032] The design of the auxiliary slag discharge structure 3 causes the oil residue particles to move in a spiral line along the inner wall of the drum component 1 under the combined action of centrifugal force and spiral thrust. At the same time, the reciprocating motion of the auxiliary blades 31 generates radial pulsation, forming a composite trajectory of spiral advancement + radial oscillation. Dynamic extrusion destroys the oil film structure, and centrifugal suction recovers the leaked oil. The synergistic effect of variable volume extrusion + filtering gap reduces oil wrapping, enhances the oil stripping effect, reduces oil residue residue, avoids channel blockage, and allows a higher solid load.

[0033] refer to Figure 2 、 Figure 3 and Figure 5An L-shaped rib 34 is embedded on the side of the sleeve 32, and the surface of the rib 34 is set to be inclined, which is tightly attached to the inner wall of the spiral main shaft 21 under the action of centrifugal force to form a dynamic seal; and the inclined surface design not only cleans the residue on the surface of the spiral main shaft 21 when the sleeve 32 moves axially, but also forms a wedge-shaped extrusion area when the volume is reduced, exerting shear stress on the material, thereby breaking the agglomerated oil residue particles.

[0034] The cross section of the chute 33 is designed to be trapezoidal, which not only makes it difficult for intruding particles to settle, but also when oil residue invades, the spiral main shaft 21 generates axial thrust when rotating, which automatically discharges the particles to both ends of the sleeve 32.

[0035] However, as the auxiliary blades 31 perform axial reciprocating motion to squeeze the oil residue, an inevitable gap forms between them and the inner wall of the small end 11 of the bowl. Although this gap is within the design tolerance, it becomes a potential channel for oil and fine residue particles to leak out due to the dual effects of the centrifugal field and extrusion pressure. High-viscosity oil forms a pressure gradient during the extrusion phase. Due to fluidity and the pressure difference, some incompletely separated oil phase migrates to the low-pressure region through the annular gap between the auxiliary blades 31 and the inner wall of the bowl. Meanwhile, fine residue particles smaller than the gap size, under the influence of the tangential component of the centrifugal force, escape laterally through the gap between the spiral blades 22 and the auxiliary blades 31. This leakage not only increases the oil content of the discharged residue and reduces overall separation efficiency, but also causes viscous blockage when the incompletely separated oil residue enters the discharge channel, forcing frequent equipment shutdowns for cleaning, reducing effective operating time, and seriously affecting production efficiency and processing capacity. To address this, the present invention incorporates a constraint assembly 35 at the edge of the auxiliary blades 31.

[0036] refer to Figure 6 and Figure 7 A groove 13 is provided on the inner wall of the small end 11 of the drum. The depth of the groove 13 increases as it approaches the large end 12 of the drum. An inclined plate is fixedly connected to the side of the groove 13 near the large end 12 of the drum. The constraint component 35 includes an elastic layer 351 flexibly connected to the outer wall of the auxiliary blade 31. The outer wall of the elastic layer 351 is provided with a protrusion 352 that seals and slides with the inner wall of the groove 13. The protrusion 352 fits with the inner wall of the groove 13 under the action of the elastic layer 351.

[0037] As the auxiliary blade 31 moves toward the drum's large end 12, the elastic layer 351, flexibly connected to its outer wall, simultaneously drives the projection 352 into the groove 13. As the depth of the groove 13 increases toward the drum's large end 12, the embedding depth of the projection 352 gradually increases, forcing the elastic layer 351 to expand radially. During this process, the elastic force generated by the elastic layer 351 forms a dynamic equilibrium with the oil residue pressure, maintaining the contact pressure between the projection 352 and the inner wall of the groove 13 and ensuring that the sealing gap is always kept to a minimum.

[0038] When auxiliary blade 31 reverses and returns to the reset phase, bump 352 gradually disengages from the deeper portion of groove 13, elastic layer 351 radially contracts, and the gap returns to its initial design value. Throughout this reciprocating motion, the deformation of elastic layer 351 is linearly proportional to the depth of groove 13, ensuring a stable seal.

[0039] As the auxiliary blades 31 move toward the drum's large end 12, the bumps 352 push the slag embedded in the grooves 13 axially. When the slag contacts the inclined plate near the drum's large end 12, the inclined plate exerts a supporting force perpendicular to the plate surface. The axial component propels the slag forward, while the tangential component provides upward lift. Under the influence of the centrifugal field, the slag acquires sufficient kinetic energy to slide along the inclined plate into the slag discharge channel. This dual slag discharge mechanism effectively reduces the rate of slag particles remaining in the grooves 13.

[0040] The above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit the same. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. However, these modifications or replacements will not cause the essence of the corresponding technical solutions to deviate from the protection scope of the technical solutions of the various embodiments of the present invention.

Claims

1. A waste mineral oil impurity removal, separation and recovery system, characterized in that: include: A drum component (1) is composed of a drum large end (12) and a drum small end (11) that are fixedly connected, and generates a centrifugal force field through high-speed rotation, so that the oil, water, and solid phases in the waste mineral oil are separated into layers according to density differences; A spiral component (2), the spiral component (2) being located in the internal cavity of the drum component (1) and pushing solid slag particles toward a slag discharge port through differential rotation, the spiral component (2) comprising a spiral main shaft (21); An auxiliary slag discharge structure (3) is provided on the outside of the spiral main shaft (21) located at the small end (11) of the drum. The auxiliary slag discharge structure (3) includes a sleeve (32) sleeved on the outer surface of the circular shaft of the spiral main shaft (21). A sliding groove (33) is provided inside the sleeve (32) and is slidably connected to the outer wall of the spiral main shaft (21). When the spiral main shaft (21) rotates, the sleeve (32) is driven to perform axial reciprocating motion. The sleeve (32) is fixedly connected to an auxiliary blade (31) on its exterior, and an outer wall of the auxiliary blade (31) is provided with a constraint component (35) that changes diameter as the sleeve (32) reciprocates.

2. The waste mineral oil impurity removal, separation and recovery system according to claim 1, characterized in that: The outer wall of the spiral main shaft (21) is fixedly connected with a spiral blade (22), and a raised slider (211) is fixedly connected between adjacent spiral blades (22), and the raised slider (211) is embedded in the inner wall of the slide groove (33).

3. The waste mineral oil impurity removal, separation and recovery system according to claim 2, characterized in that: The chute (33) is composed of intersecting curved grooves, and the curved grooves are designed in a trapezoidal shape.

4. The waste mineral oil impurity removal, separation and recovery system according to claim 1, characterized in that: A rib (34) is provided on the side of the sleeve (32); the outer surface of the rib (34) adopts a sloped design, and the inner wall of the rib (34) adopts an L-shaped design.

5. The waste mineral oil impurity removal, separation and recovery system according to claim 1, characterized in that: A groove (13) is provided on the inner wall of the large end (12) of the drum, and an inclined plate is fixedly connected to one end of the groove (13) close to the large end (12) of the drum.

6. The waste mineral oil impurity removal, separation and recovery system according to claim 5, characterized in that: The constraint assembly (35) comprises an elastic layer (351) flexibly connected to the outer wall of the auxiliary blade (31), and the outer wall of the elastic layer (351) is provided with a protrusion (352) that slides in a sealing manner with the inner wall of the groove (13).

7. The waste mineral oil impurity removal, separation and recovery system according to claim 6, characterized in that: The depth of the groove (13) increases gradually along the direction of the large end (12) of the drum, and the ratio of the depth of the groove (13) close to the large end (12) of the drum to the depth of the groove (13) close to the small end (11) of the drum is 4:3.

Images