CN112845556B

CN112845556B - Harmless recovery system for oil-containing soil

Info

Publication number: CN112845556B
Application number: CN202110089071.3A
Authority: CN
Inventors: 潘国强; 邵丹萍
Original assignee: Yixing Innovation Environmental Protection Co ltd; Jiangsu Chuangxin Environment Engineering Co ltd
Current assignee: Yixing Innovation Environmental Protection Co ltd; Jiangsu Chuangxin Environment Engineering Co ltd
Priority date: 2021-01-22
Filing date: 2021-01-22
Publication date: 2022-07-08
Anticipated expiration: 2041-01-22
Also published as: CN112845556A

Abstract

The invention relates to the field of soil restoration, in particular to an oil-soil harmless restoration system. A harmless oil-bearing soil recovery system comprises a storage mechanism and a horizontal spiral discharge sedimentation centrifuge. And discharging the oil-containing soil mixture from the material storage mechanism into a horizontal spiral discharging sedimentation centrifuge for solid-liquid separation. The horizontal spiral discharging sedimentation centrifuge comprises a shell, a rotary drum, a feeding mechanism, a filtering mechanism, a solid phase discharging mechanism, a liquid phase discharging port, an accelerating cleaning device and a driving device. When the oil-containing soil harmless recovery system is used for separating an oil-containing soil mixture by using a horizontal sedimentation spiral discharging centrifugal machine, the separated particles are attached to the inner wall of an elastic mechanism through a filter cylinder and a spiral blade and are discharged from a solid phase discharge port, meanwhile, a micro injection pump and a hammer switch device are started, a hammer is electrified to hit the filter cylinder inwards in a small range frequently, solid phase particles remained on the filter cylinder are shaken off, and the filter cylinder is cleaned.

Description

Harmless recovery system for oil-containing soil

Technical Field

The invention relates to the field of soil restoration, in particular to a harmless oil-soil restoration system.

Background

At present, the treatment method of oil-containing mud in China can be generally divided into two categories, one is to oxidize and decompose oil in the oil-containing mud, such as by adopting a strong oxidant or direct incineration, and the other is to separate oil from mud, and the technology for treating the oil mud by a direct oxidation or incineration method is mature, but the oil in the oil mud cannot be recovered, so that precious resources are wasted. The mud treated by the separation method still contains a certain amount of oil, the oil and mud are generally separated by adding chemical substances and water into the oil mud, and then stirring, washing and separating the mixture to achieve the purpose of oil and mud separation, the used equipment is various, mainly has the forms of a stirrer, a centrifuge, a roller and the like, and the equipment is very large after being combined, occupies a large space and land, and is high in cost. The existing separation of oily sludge usually adopts a horizontal sedimentation spiral discharge centrifuge to separate, solid phase particles are pushed to a small end slag discharge port of a rotary drum through blades on a spiral pusher during separation and are discharged, a liquid phase overflows through an overflow hole at a large end of the rotary drum, and the process is circulated continuously so as to achieve the purpose of continuous separation.

Disclosure of Invention

The invention provides an oil-bearing soil harmless recovery system, which aims to solve the problem that the existing soil recovery system is poor in separation effect.

The harmless recovery system for the oil-bearing soil adopts the following technical scheme:

a harmless oil-containing soil recovery system comprises a storage mechanism and a horizontal spiral discharge sedimentation centrifuge. And discharging the oil-containing soil mixture from the material storage mechanism into a horizontal spiral discharging sedimentation centrifuge for solid-liquid separation. The horizontal spiral discharging sedimentation centrifuge comprises a shell, a rotary drum, a feeding mechanism, a filtering mechanism, a solid phase discharging mechanism, a liquid phase discharging port, an accelerating cleaning device and a driving device. The housing extends in the left-right direction. The rotary drum is rotatably arranged in the shell and extends along the left-right direction. The feeding mechanism is rotatably arranged in the rotary drum and is coaxial with the rotary drum. The filtering mechanism is arranged at the outer side of the feeding mechanism and is arranged in the rotary drum; the interior and the exterior of the feeding mechanism are communicated at least at one position; the solid phase discharge port and the liquid phase discharge port are respectively arranged on two sides of the rotary drum. The driving device is configured to drive the rotary drum and the feeding mechanism to rotate in the same direction but at different speeds. When the feeding mechanism rotates, the oil-containing soil mixture is diffused to the outer side of the feeding mechanism and is separated and filtered under the action of the filtering mechanism, so that solid-phase particles are separated from a liquid phase, the separated solid-phase particles are conveyed to a solid-phase discharge port to be discharged, and the separated liquid phase is discharged from the liquid-phase discharge port; the accelerated cleaning device includes a hammer mounted to the drum and configured to operate when the driving device starts to operate, to stop operating after a period of time, and to resume operating when the driving device exceeds a preset time.

Further, the accelerated cleaning device comprises a first switch device and a second switch device; the first switching device includes a support housing, a first electrode, a second electrode, and a third electrode. The supporting shell is installed on the inner wall of the rotary drum and is provided with an accommodating cavity with an outward opening, a baffle is installed on the outer side of the accommodating cavity, a conductive liquid inlet is formed in the baffle, the first electrode and the second electrode are installed on the supporting shell, and a conductive liquid outlet is formed in the bottom end of the supporting shell. The first electrode is arranged in the accommodating cavity of the supporting shell, and the middle part of the first electrode is provided with an installation cavity; the second electrode is arranged in the mounting cavity and is arranged at intervals with the first electrode, the third electrode is arranged in the mounting cavity and is used for being electrically connected with the first electrode and the second electrode, the inner end of the third electrode is in sliding fit with the first electrode and the second electrode, and the outer end of the third electrode is positioned on the outer side of the second electrode; the second switch device comprises a micro-injection pump and conductive liquid, the conductive liquid is stored in the micro-injection pump, and when the driving device works, the micro-injection pump simultaneously, micro-uniformly and continuously injects the conductive liquid into the containing cavity.

Further, the second switching device is configured such that after a predetermined time is exceeded, the conductive liquid is simultaneously brought into contact with the first electrode, the second electrode, and the third electrode, the circuit is conducted, and the hammer starts to operate.

Further, the first switch device further comprises a plurality of springs, one end of each spring is connected with the supporting shell, the other end of each spring is connected with the third electrode, and an insulator is arranged at the lower end of each third electrode.

Furthermore, a plurality of liquid inlet holes are formed in the side wall of the third electrode, and the top ends of the liquid inlet holes are located above the second electrode.

Further, the feeding mechanism comprises an inner cylinder, an outer cylinder and a diffusion channel; the inner cylinder extends along the left-right direction, the right end of the inner cylinder is connected with the material storage mechanism, the outer cylinder is arranged on the outer side of the inner cylinder and is coaxial with the inner cylinder, the diffusion channel is communicated with the inside of the inner cylinder and the outer side of the outer cylinder, the left end of the diffusion channel is blocked, and oily sludge entering the inner cylinder enters the solid-phase discharge cavity through the diffusion channel; the left end of the rotary drum is a conical head, the diameter of the left end is smaller than that of the right end, and the solid-phase discharge port is arranged on the side wall of the conical head and communicated with the solid-phase discharge cavity.

Further, the filtering mechanism comprises a helical blade and a filtering cylinder; the helical blade is arranged on the outer side of the outer barrel and rotates along with the outer barrel, and the rotating direction of the helical blade is the same as that of the outer barrel; the cartridge filter is installed in the rotary drum and is set up in helical blade's outside, forms solid phase row material chamber between cartridge filter and the urceolus, and the cartridge filter only allows the liquid phase to pass through.

Furthermore, the hammering has a plurality ofly, and a plurality of hammers are along left and right sides direction intermittent type distribution and along the circumference evenly distributed of cartridge filter, and the hammering end of hammer is the rubber material.

Furthermore, the horizontal spiral discharging sedimentation centrifuge also comprises a converging hopper, the converging hopper is arranged on the outer side of the solid phase discharge port of the conical head and is installed on the shell, and a converging opening is formed in the lower end of the converging hopper.

Furthermore, the driving device comprises a driving motor and a differential mechanism, the driving motor drives the differential mechanism to rotate, and the differential mechanism drives the inner cylinder and the rotary drum to rotate in the same direction and at different speeds; the liquid phase discharge port is arranged below the right end of the shell, and the liquid phase is discharged from the liquid phase discharge port; a liquid phase merging port is arranged below the right end of the shell, and the liquid phase discharged from the liquid phase discharge port is discharged from the liquid phase merging port.

The invention has the beneficial effects that: when the oil-containing soil harmless recovery system is used for separating an oil-containing soil mixture by using a horizontal sedimentation spiral discharging centrifugal machine, the separated particles are attached to the inner wall of an elastic mechanism through a filter cylinder and a spiral blade and are discharged from a solid phase discharge port, meanwhile, a micro injection pump and a hammer switch device are started, a hammer is electrified to hit the filter cylinder inwards in a small range frequently, solid phase particles remained on the filter cylinder are shaken off, and the filter cylinder is cleaned.

When the third electrode moves outwards under the action of centrifugal force, the third electrode is separated from the first electrode and the second electrode, the circuit of the hammer is disconnected, and the hammer stops working. When the filter cartridge filter effect is poor because the density of the oil-containing soil mixture is high, and the spiral blade is reduced because of large resistance, the centrifugal force of the third electrode is weakened and is not enough to offset the elastic force of the spring, the third electrode resets and contacts with the first electrode and the second electrode again, the circuit is switched on, the hammer starts to work to vibrate the filter cartridge, and the filter holes in the filter screen are dredged, so that the filter efficiency is improved.

When the mixture containing oil and soil is not completely separated within the preset time, the conductive liquid starts to be in contact with the first electrode, the second electrode and the third electrode at the same time, the circuit is connected, the hammer starts to work, the filter cylinder is frequently hit inwards in a small range, the separation and the discharge of the mixture containing oil and soil in the filter cylinder are accelerated, the adhesion of the mixture containing oil and soil on the filter cylinder is reduced, and the filtering effect is good.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts.

FIG. 1 is a schematic structural diagram of an embodiment of an oil-bearing soil detoxification recovery system according to the invention;

FIG. 2 is a cross-sectional view of a horizontal screw discharge decanter centrifuge of an embodiment of an oil-contaminated soil remediation system of the present invention;

FIG. 3 is an enlarged view of A in FIG. 2;

FIG. 4 is a cross-sectional view of a first switchgear of an embodiment of an oil-contaminated soil remediation system of the present invention;

FIG. 5 is an enlarged view of B in FIG. 4;

FIG. 6 is a cross-sectional view of a support shell and a third electrode of an embodiment of an oil-contaminated soil remediation system of the present invention;

FIG. 7 is a schematic structural view of a third electrode of an embodiment of the oil-contaminated soil remediation system of the present invention;

FIG. 8 is a cross-sectional view of the feed mechanism of an embodiment of an oil-contaminated soil remediation system of the present invention;

FIG. 9 is a cross-sectional view of a drum of an embodiment of an oil-contaminated soil remediation system of the present invention;

FIG. 10 is an enlarged view of C in FIG. 9;

in the figure: 11. a motor; 12. a differential mechanism; 13. a material storage cavity; 14. a merging port; 21. a housing; 22. a drum; 23. a solid phase discharge port; 24. a filter cartridge; 25. a liquid phase discharge port; 26. a liquid phase merging port; 27. a liquid injection hole; 28. a circuit path; 31. a helical blade; 41. an outer cylinder; 42. an inner barrel; 43. a diffusion channel; 51. a support housing; 52. a first electrode; 53. a third electrode; 531. an insulator; 54. a second electrode; 541. a liquid inlet hole; 55. a spring; 56. a conductive liquid inlet; 57. a conducting liquid outlet; 61. hammering; 71. a micro-injection pump.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

An embodiment of the oil-soil-containing harmless recovery system of the invention is shown in fig. 1 to 10, and the oil-soil-containing harmless recovery system comprises a storage mechanism and a horizontal spiral discharge sedimentation centrifuge. And discharging the oil-containing soil mixture from the material storage mechanism into a horizontal spiral discharging sedimentation centrifuge for solid-liquid separation. The horizontal spiral discharge sedimentary centrifuge comprises a shell 21, a rotary drum 22, a feeding mechanism, a filtering mechanism, a solid phase discharge port 23, a liquid phase discharge port 25, an accelerated cleaning device and a driving device. The housing 21 extends in the left-right direction; the rotary drum 22 is rotatably installed in the housing 21 and extends in the left-right direction. The feeding mechanism is rotatably arranged in the rotary drum 22 and is coaxial with the rotary drum 22; the filtering mechanism is arranged outside the feeding mechanism and is installed in the rotary drum 22. The interior and the exterior of the feeding mechanism are communicated at least at one position; the solid phase discharge port 23 and the liquid phase discharge port 25 are provided on the left and right sides of the rotary drum 22, respectively. The drive means is configured to drive drum 22 and the feed mechanism to rotate in the same direction but at different speeds; when the feeding mechanism rotates, the oil-containing soil mixture is diffused to the outer side of the feeding mechanism and is separated and filtered under the action of the filtering mechanism, so that solid-phase particles are separated from a liquid phase, the separated solid-phase particles are conveyed to the solid-phase discharge port 23 to be discharged, and the separated liquid phase is discharged from the liquid-phase discharge port 25; the accelerated cleaning means comprises a hammer 61, the hammer 61 being mounted to the drum 22 and configured to operate when the drive means starts to operate, to stop operating after a period of time, and to restart when the drive means has operated over time.

In the embodiment, the accelerated cleaning device comprises a first switch device and a second switch device; the first switching device comprises a supporting shell 51, a first electrode 52, a second electrode 54 and a third electrode 53. The supporting shell 51 is mounted on the inner wall of the rotating drum 22 and is provided with a cavity with an outward opening, a baffle is mounted on the outer side of the cavity, a conductive liquid inlet 56 is formed in the baffle, the first electrode 52 and the second electrode 54 are both mounted on the supporting shell 51, and a conductive liquid outlet 57 is formed in the bottom end of the supporting shell 51; the first electrode 52 is mounted in the cavity of the support case 51, and a mounting cavity is provided in the middle of the first electrode 52. The second electrode 54 is installed in the installation cavity and spaced from the first electrode 52, the third electrode 53 is installed in the installation cavity and electrically connected to the first electrode 52 and the second electrode 54, the inner end of the third electrode 53 is in sliding fit with the first electrode 52 and the second electrode 54, and the outer end is located outside the second electrode 54. The second switch device comprises a micro-injection pump 71 and conductive liquid, the conductive liquid is stored in the micro-injection pump 71, and when the driving device works, the micro-injection pump 71 simultaneously, micro-uniformly and continuously injects the conductive liquid into the cavity. The inner side of the rotary drum 22 is provided with a circuit channel 28 for placing a circuit, the outer side is provided with a liquid injection hole 27, and the conductive liquid is injected into a micro-injection pump 71 from the liquid injection hole 27.

In this embodiment, the second switching device is configured such that after the completion of the separation of the oil-containing soil mixture after the lapse of a predetermined time, the conductive liquid is simultaneously brought into contact with the first electrode 52, the second electrode 54, and the third electrode 53, the circuit is turned on, and the hammer 61 is operated.

The first switching means further comprises a plurality of springs 55, one end of the spring 55 is connected to the supporting case 51 and the other end is connected to the third electrode 53, and the lower end of the third electrode 53 is provided with an insulator 531 to electrically disconnect the first electrode 52 and the second electrode 54 when the third electrode 53 slides outward, and the hammer 61 stops operating.

In this embodiment, a plurality of liquid inlet holes 541 are disposed on the sidewall of the third electrode 53, and the top ends of the liquid inlet holes 541 are located above the second electrode 54.

In the present embodiment, the feed mechanism includes an inner cylinder 42, an outer cylinder 41, and a diffusion passage 43; the inner cylinder 42 extends along the left-right direction, the right end of the inner cylinder is connected with the material storage mechanism, the outer cylinder 41 is arranged on the outer side of the inner cylinder 42 and is coaxially arranged with the inner cylinder 42, the diffusion channel 43 is communicated with the inner part of the inner cylinder 42 and the outer side of the outer cylinder 41, the left end of the diffusion channel 43 is blocked, and oil-containing sludge entering the inner cylinder 42 enters the solid phase discharge cavity through the diffusion channel 43. The left end of the rotary drum 22 is a conical head, the diameter of the left end of the conical head is smaller than that of the right end of the conical head, and the solid phase discharge port 23 is arranged on the side wall of the conical head and communicated with the solid phase discharge cavity.

In the present embodiment, the filter mechanism includes the spiral blade 31 and the filter cartridge 24; the helical blade 31 is installed on the outer side of the outer cylinder 41 and rotates along with the outer cylinder 41, and the rotation direction of the helical blade 31 is the same as that of the outer cylinder 41; the filter cartridge 24 is mounted on the rotary drum 22 and disposed outside the spiral blade 31, a solid phase discharge chamber is formed between the filter cartridge 24 and the outer cylinder 41, and the filter cartridge 24 allows only a liquid phase to pass through.

In this embodiment, there are a plurality of hammers 61, and a plurality of hammers 61 are intermittently distributed in the left-right direction and uniformly distributed in the circumferential direction of the filter cartridge 24, and the hammering end of the hammer 61 is made of rubber, so as to prevent the hammering end from being damaged when the hammer 61 works.

In this embodiment, the horizontal screw discharge decanter centrifuge further includes a converging hopper, the converging hopper is disposed outside the conical head solid phase discharge port 23 and is mounted on the housing 21, the converging hopper is provided with a converging port 14 at a lower end thereof, and the solid phase discharged from the solid phase discharge port 23 is converged in the converging hopper and discharged from the converging port 14.

In the embodiment, the driving device comprises a driving motor 11 and a differential 12, the driving motor 11 drives the differential 12 to rotate, and the differential 12 drives the inner cylinder 42 and the rotary drum 22 to rotate in the same direction and at different speeds. The liquid phase discharge ports 25 are provided in plurality, and the liquid phase discharge ports 25 are installed at the right end of the casing 21 and are uniformly distributed along the circumferential direction of the rotary drum 22. A liquid phase merging port 26 is provided below the right end of the housing 21, and the liquid phase discharged from the liquid phase discharge port 25 is discharged from the liquid phase merging port 26.

When the device is used, the motor 11 is started, the motor 11 drives the feeding mechanism and the rotary drum 22 to rotate in the same direction but at different speeds through the differential mechanism 12, the feeding mechanism drives the helical blade 31 to rotate, meanwhile, the micro-injection pump 71 and the hammer 61 switching device are started, the hammer 61 is electrified to hit the filter cylinder 24 frequently in a small-range inward direction, solid-phase particles remained on the filter cylinder 24 are shaken off, the micro-injection pump 71 injects the conductive liquid into the cavity from the conductive liquid inlet 56 in a micro-uniform and continuous manner, a quantitative oil-containing soil mixture is pumped in from the storage cavity 13 to the inner cylinder 42 through the feed pipe, and is diffused and separated from the diffusion channel 43 under the action of centrifugal force when entering the left end of the inner cylinder 42, the separated solid-phase particles are attached to the inner wall of the filter cylinder 24 and are discharged from the solid-phase discharge port under the action of the helical blade 31, and the separated liquid phase enters the outside of the filter cylinder 24 under the action of the centrifugal force, and is discharged from the liquid phase discharge port 25. Meanwhile, when the third electrode 53 moves outwards under the action of centrifugal force, the third electrode is separated from the first electrode 52 and the second electrode 54, the circuit of the hammer 61 is disconnected, the hammer 61 stops working until the oil-containing soil mixture in the preset time is completely separated, and at the moment, the conductive liquid is positioned above the second electrode 54 and is not in contact with the second electrode 54.

When the conductive liquid in the cavity is simultaneously contacted with the first electrode 52, the second electrode 54 and the third electrode 53 and the oil-containing soil mixture is not completely separated, the circuit of the hammer 61 is switched on, the hammer 61 starts to work, the filter cylinder 24 is frequently hit inwards by small amplitude, and the separation and the discharge of the oil-containing soil mixture in the filter cylinder 24 are accelerated

When the filter cartridge 24 is poor in filtering effect due to the high density of the oil-containing soil mixture, the spiral blade 31 is subjected to large resistance to reduce the rotating speed, the centrifugal force of the third electrode 53 is weakened and cannot be enough to offset the elastic force of the spring 55, the third electrode 53 starts to reset and contacts with the first electrode 52 and the second electrode 54 again, the circuit is connected, the hammer 61 starts to work to vibrate the filter cartridge 24, and the filter holes in the filter cartridge 24 are dredged, so that the filtering efficiency is improved.

The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents, improvements and the like that fall within the spirit and principle of the present invention are intended to be included therein.

Claims

1. The harmless recovery system of the oil-bearing soil is characterized in that: comprises a material storage mechanism and a horizontal spiral discharge sedimentation centrifuge; discharging the oil-containing soil mixture from the material storage mechanism into a horizontal spiral discharging sedimentation centrifuge for solid-liquid separation; the horizontal spiral discharge sedimentation centrifuge comprises a shell, a rotary drum, a feeding mechanism, a filtering mechanism, a solid phase discharging mechanism, a liquid phase discharging port, an accelerated cleaning device and a driving device; the shell extends along the left and right direction; the rotary drum is rotatably arranged in the shell and extends along the left and right directions; the feeding mechanism is rotatably arranged in the rotary drum and is coaxial with the rotary drum; the filtering mechanism is arranged at the outer side of the feeding mechanism and is arranged in the rotary drum; the interior and the exterior of the feeding mechanism are communicated at least at one position; the solid phase discharge port and the liquid phase discharge port are respectively arranged at two sides of the rotary drum; the driving device is configured to drive the rotary drum and the feeding mechanism to rotate in the same direction but at different speeds; when the feeding mechanism rotates, the oil-containing soil mixture is diffused to the outer side of the feeding mechanism and is separated and filtered under the action of the filtering mechanism, so that solid-phase particles are separated from a liquid phase, the separated solid-phase particles are conveyed to a solid-phase discharge port to be discharged, and the separated liquid phase is discharged from the liquid-phase discharge port; the accelerated cleaning device comprises a hammer, the hammer is arranged on the rotary drum and is configured to work when the driving device starts, stop working after a period of time and work again when the driving device exceeds preset time, the feeding mechanism comprises an inner cylinder, an outer cylinder and a diffusion channel, the filtering mechanism comprises a spiral blade and a filter cylinder, the inner cylinder extends along the left and right direction, the right end of the inner cylinder is connected with the storage mechanism, the outer cylinder is arranged on the outer side of the inner cylinder and is coaxial with the inner cylinder, the diffusion channel is communicated with the inside of the inner cylinder and the outer side of the outer cylinder, the left end of the diffusion channel is blocked, and oil-containing soil mixture entering the inner cylinder enters the solid-phase discharge cavity through the diffusion channel; the left end of the rotary drum is a conical head, the diameter of the left end is smaller than that of the right end, and the solid-phase discharge port is arranged on the side wall of the conical head and communicated with the solid-phase discharge cavity; the filtering mechanism comprises a helical blade and a filter cylinder; the helical blade is arranged on the outer side of the outer barrel and rotates along with the outer barrel, and the rotating direction of the helical blade is the same as that of the outer barrel; the filter cartridge is arranged on the rotary drum and arranged on the outer side of the spiral blade, a solid-phase discharging cavity is formed between the filter cartridge and the outer cylinder, the filter cartridge only allows a liquid phase to pass through, the driving device comprises a driving motor and a differential mechanism, the driving motor drives the differential mechanism to rotate, and the differential mechanism drives the inner cylinder and the rotary drum to rotate at different speeds in the same direction; the accelerated cleaning device comprises a first switch device and a second switch device; the first switching device includes a support housing, a first electrode, a second electrode, and a third electrode; the support shell is arranged on the inner wall of the rotary drum and is provided with a containing cavity with an outward opening, a baffle is arranged on the outer side of the containing cavity, a conductive liquid inlet is formed in the baffle, the first electrode and the second electrode are both arranged on the support shell, and a conductive liquid outlet is formed in the bottom end of the support shell; the first electrode is arranged in the containing cavity of the supporting shell, and the middle part of the first electrode is provided with an installation cavity; the second electrode is arranged in the mounting cavity and is arranged at intervals with the first electrode, the third electrode is arranged in the mounting cavity and is used for being electrically connected with the first electrode and the second electrode, the inner end of the third electrode is in sliding fit with the first electrode and the second electrode, and the outer end of the third electrode is positioned on the outer side of the second electrode; the second switch device comprises a micro-injection pump and a conductive liquid, the conductive liquid is stored in the micro-injection pump, when the driving device works, the micro-injection pump simultaneously, micro-uniformly and continuously injects the conductive liquid into the containing cavity, the second switch device is configured to be contacted with the first electrode, the second electrode and the third electrode at the same time after the preset time is exceeded, the circuit is conducted, the hammer starts to work, the first switch device further comprises a plurality of springs, one ends of the springs are connected with the supporting shell, the other ends of the springs are connected with the third electrode, and an insulator is arranged at the lower end of the third electrode; when the third electrode is moved outwards under the action of centrifugal force, the third electrode is separated from the first electrode and the second electrode, the circuit of the driving hammer is cut off, the driving hammer stops working, when the density of the oil-containing soil mixture is high, the filtering effect of the filter cylinder is poor, and when the rotating speed of the spiral blade is reduced due to large resistance, the centrifugal force of the third electrode is weakened and is not enough to offset the elastic force of the spring, the third electrode resets and is contacted with the first electrode and the second electrode again, the circuit is switched on, the driving hammer starts to work to vibrate the filter cylinder, and the filter holes in the filter screen are dredged.

2. The oil-bearing soil harmless recovery system according to claim 1, wherein: the side wall of the third electrode is provided with a plurality of liquid inlet holes, and the top ends of the liquid inlet holes are positioned above the second electrode.

3. The oil-bearing soil harmless recovery system according to claim 1, wherein: the drive hammer has a plurality ofly, and a plurality of drive hammers are along left and right sides direction intermittent type distribution and along the circumference evenly distributed of cartridge filter, and the hammering end of drive hammer is the rubber material.

4. The oil-bearing soil harmless recovery system according to claim 1, wherein: the horizontal spiral discharge sedimentary centrifuge also comprises a converging hopper, the converging hopper is arranged on the outer side of the solid-phase discharge port of the conical head and is arranged on the shell, and a converging opening is formed in the lower end of the converging hopper.

5. The oil-bearing soil harmless recovery system according to claim 1, wherein: the liquid phase discharge port is arranged below the right end of the shell, and the liquid phase is discharged from the liquid phase discharge port; a liquid phase merging port is arranged below the right end of the shell, and the liquid phase discharged from the liquid phase discharge port is discharged from the liquid phase merging port.