Oil sludge dehydration treatment system

Abstract

The invention relates to the technical field of sludge treatment, in particular to an oil sludge dehydration treatment system which comprises sludge pretreatment equipment used for pretreating oil sludge to reduce viscosity of the oil sludge and promote oil-water separation, and the sludge pretreatment equipment comprises a mixing and stirring tank used for containing the oil sludge and chemical agents. A stirring shaft is rotatably arranged in the mixing and stirring tank, two L-shaped stirring blades are symmetrically arranged at the bottom end of the stirring shaft, an anchor stirrer formed by the unfolded L-shaped stirring blades is used for carrying out low-speed large-torque stirring at the initial high-viscosity stage of the oil sludge, and it is ensured that a medicament is evenly dispersed; after the raw materials are uniformly mixed and react for a period of time, the viscosity is reduced, at the moment, the folding assembly drives the L-shaped stirring blades to fold and retract, and a turbo-type stirrer is formed, so that high-speed shearing and stirring are performed, oil drop aggregation and floc formation are accelerated, the energy consumption is reduced, and the treatment period is shortened.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of sludge treatment, in particular to a sludge dewatering treatment system. BACKGROUND

[0002] The sludge dewatering treatment system realizes efficient separation of oil-water-mud three phases, significantly reduces water content and recovers crude oil through pretreatment (such as debris fishing, chemical conditioning and heating), mechanical dewatering (such as centrifuge, stacked screw machine, belt filter press) and pyrolysis technology (optional) modules, and has the characteristics of environmental protection, energy saving, high automation and strong adaptability, which can effectively reduce the volume of sludge, avoid environmental pollution, and create economic value through resource utilization (such as brick making and road paving).

[0003] In the sludge pretreatment stage, the stirrer in the mixing tank is used to mix the raw materials, and the heating device is used to accelerate the reaction process. The type of stirrer needs to be selected according to the viscosity of the raw materials. For example, the turbine stirrer is suitable for low viscosity system, and the anchor stirrer is more suitable for high viscosity medium. Since the sludge is high in viscosity at the beginning of the reaction and needs to be heated, the anchor stirrer can effectively remove the adhesion on the wall of the kettle and prevent local overheating and coking. At the same time, although the large contact area design can enhance the mixing effect, it limits the high-speed rotation ability. However, as the reaction of sludge and chemical agents progresses, the viscosity of the system gradually decreases. If a low-speed anchor stirrer is still used in the middle and late stages, the mixing efficiency will be reduced and the treatment period will be prolonged. Therefore, we propose a sludge dewatering treatment system. SUMMARY

[0004] To solve the above technical problems, the present application provides a sludge dewatering treatment system, which includes a sludge pretreatment device for pretreating sludge to reduce its viscosity and promote oil-water separation. The sludge pretreatment device includes:

[0005] A mixing tank is used to contain sludge and chemical agents. A stirring shaft is rotatably arranged in the mixing tank, and two L-shaped stirring blades are symmetrically arranged at the bottom end of the stirring shaft. The two L-shaped stirring blades and the stirring shaft form an anchor stirrer. A folding assembly is arranged on the stirring shaft and connected with the L-shaped stirring blades. The L-shaped stirring blades are designed to be foldable, and the folding assembly drives the L-shaped stirring blades to deflect and fold to form a turbine stirrer. A driving member connected with the stirring shaft is arranged on the mixing tank to drive the stirring shaft to rotate.

[0006] A subsequent dewatering treatment unit is connected with the sludge pretreatment device for further dewatering treatment of the pretreated sludge, to obtain dewatered sludge cake and recovered oil phase.

[0007] In some embodiments, the folding assembly includes a hollow cylinder fixedly connected to the bottom end of the stirring shaft, and the L-shaped stirring blade adopts a split design, which includes a rectangular blade fixedly connected to the hollow cylinder, one end of the rectangular blade is rotatably connected to a deflection plate, and one end of the deflection plate is rotatably connected to the L-shaped blade;

[0008] And a shaft 1 is rotatably connected to both ends of the deflection plate, and the two shafts 1 are fixedly connected to the rectangular blade and the L-shaped blade respectively, and a gear disc 1 is fixedly connected to the two shafts 1, and the two gear discs 1 are engaged, and a pushing member connected to the deflection plate is provided on the hollow cylinder, which is used to push the deflection to drive the L-shaped blade to deflect and retract.

[0009] In some embodiments, the pushing member includes an inclined plate fixedly connected to the deflection plate, a push rod is slidably connected to the rectangular blade, one end of the push rod is fixedly connected to the hollow rectangular plate, and the inclined plate is rotatably connected to a second shaft with one end located in the hollow rectangular plate, and moving the push rod drives the deflection plate to deflect;

[0010] A round rod is slidably connected in the stirring shaft, one end of the round rod is located in the hollow cylinder and fixedly connected to the shaft three, and one end of the push rod is located in the hollow cylinder and fixedly connected to the connecting plate, and a connecting rod one is rotatably connected between the connecting plate and the shaft three, pushing the round rod to drive the push rod to move;

[0011] An electric push rod is provided on the mixing tank, the extended end of the electric push rod is fixedly connected to an L-shaped push plate, and one end of the L-shaped push plate is rotatably connected to the round rod. Starting the electric push rod drives the round rod to move.

[0012] In some embodiments, two rectangular stirring blades are symmetrically arranged on the hollow cylinder, one end of the rectangular stirring blade is fixedly connected to shaft four, the shaft four is rotatably connected to the hollow cylinder, and a linkage is provided between the shaft four and the connecting plate. In the initial stage of operation of the device, the rectangular stirring blade is parallel to its rotation direction. When the L-shaped blade is folded, the linkage is used to drive shaft four to rotate to drive the rectangular stirring blade to deflect and tilt.

[0013] In some embodiments, the linkage member includes a swing plate fixedly connected to one end of shaft four, and a connecting rod two is rotatably connected between the swing plate and the connecting plate, which drives shaft four to rotate when the connecting plate moves.

[0014] In some embodiments, the driving member includes a mounting frame fixedly connected to the mixing tank, a driving motor is fixedly connected to the mounting frame, a gear disc 2 is fixedly connected to the stirring shaft, a hollow shaft 5 is provided on the output shaft of the driving motor, a gear disc 3 engaged with the gear disc 2 is fixedly connected to the hollow shaft 5, and the driving motor is started to drive the stirring shaft to rotate.

[0015] In some embodiments, the stirring shaft is also fixedly connected to a third toothed disc, and the hollow shaft is also fixedly connected to a second toothed disc, and the second toothed disc has a larger diameter than the third toothed disc.

[0016] A slide groove is provided on the output shaft of the driving motor, and a sliding protrusion with one end located in the slide groove is fixedly connected to the inner wall of the hollow shaft five. One end of the L-shaped push plate is rotatably connected to the hollow shaft five. In the initial operation of the device, the gear disc two on the stirring shaft is engaged with the gear disc three on the hollow shaft five. When the L-shaped blade is folded, the L-shaped push plate moves to drive the gear disc two on the hollow shaft five to move and engage with the gear disc three on the stirring shaft. At the same time, the gear disc three on the hollow shaft five is disengaged from the gear disc two on the stirring shaft.

[0017] In some embodiments, the mixing tank is provided with a heating unit for heating the oily sludge to reduce its viscosity and promote chemical reactions;

[0018] The heating unit comprises a hollow layer arranged on the mixing and stirring tank, and two pipes are conductively connected to the hollow layer, and the two pipes are conductively connected to an external circulating hot water supply device.

[0019] In some embodiments, the subsequent dehydration treatment unit includes a centrifugal dehydrator for separating water from the oily sludge by centrifugal force.

[0020] In some embodiments, the mixing tank is provided with an online viscometer, which is electrically connected to the controller of the electric push rod and is used to measure the viscosity of the oily sludge in real time.

[0021] The present invention has at least the following beneficial effects:

[0022] 1. This device uses an anchor agitator formed by unfolded L-shaped stirring blades to perform low-speed, high-torque stirring at the initial high-viscosity stage of the waste oil sludge to ensure uniform dispersion of the reagents. After the raw materials are evenly mixed and reacted for a period of time, the viscosity decreases. At this time, the folding component drives the L-shaped stirring blades to fold and retract, forming a turbine agitator for high-speed shear stirring, accelerating the aggregation of oil droplets and the formation of flocs, thereby reducing energy consumption and shortening the treatment cycle.

[0023] 2. When the agitator of this device is in the folded state, the rectangular stirring blades are in an inclined state, thereby providing a certain axial circulation for the mixing of raw materials, thereby improving the mixing effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 This is a schematic diagram of the overall structure of Example 1 of the present invention;

[0025] Figure 2 For the present invention Figure 1 Schematic diagram of the local cross-section structure;

[0026] Figure 3 For the present invention Figure 2 Schematic diagram of the structure of the middle A area;

[0027] Figure 4 For the present invention Figure 2 Schematic diagram of the local cross-section structure;

[0028] Figure 5 For the present invention Figure 4 Schematic diagram of the structure of the middle B area;

[0029] Figure 6 For the present invention Figure 4 Schematic diagram of the local cross-section structure;

[0030] Figure 7 This is a schematic diagram of the structure of the L-shaped stirring blade of the present invention;

[0031] Figure 8 For the present invention Figure 7 Schematic diagram of the structure of the middle C area;

[0032] Figure 9 For the present invention Figure 7 Schematic diagram of the local cross-section structure;

[0033] Figure 10 For the present invention Figure 6 Schematic diagram of the local cross-section structure;

[0034] Figure 11 For the present invention Figure 10 Schematic diagram of the local cross-section structure;

[0035] Figure 12 This is a structural diagram of embodiment 2 of the present invention.

[0036] In the figure: 1-sludge pretreatment equipment; 2-mixing and stirring tank; 3-stirring shaft; 4-folding assembly; 5-driving member; 6-subsequent dehydration treatment unit; 7-L-shaped stirring blade; 41-hollow cylinder; 42-rectangular blade; 43-deflection plate; 44-L-shaped blade; 45-axis 1; 46-toothed disc 1; 47-pushing member; 48-inclined plate; 49-push rod; 51-hollow rectangular plate; 52-axis 2; 53-round rod; 54-axis 3; 55 -Connecting plate; 56-Connecting rod 1; 57-Electric push rod; 58-L-shaped push plate; 59-Rectangular stirring blade; 61-Shaft 4; 62-Linkage; 63-Pannel; 64-Connecting rod 2; 65-Mounting frame; 66-Drive motor; 67-Gear disc 2; 68-Hollow shaft 5; 69-Gear disc 3; 71-Slide groove; 72-Slide cam; 73-Heating unit; 74-Hollow layer; 75-Centrifugal dehydrator; 76-Online viscometer; 77-Protective shell. DETAILED DESCRIPTION

[0037] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. 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 creative efforts are within the scope of protection of the present invention.

[0038] Example 1: Please refer to Figures 1-11 The present invention provides a technical solution: a waste oil sludge dewatering treatment system, comprising:

[0039] The sludge pretreatment equipment 11 is used to pretreat the oily sludge to reduce its viscosity and promote oil-water separation. The sludge pretreatment equipment 1 includes:

[0040] Mixing and stirring tank 2, used for containing oily sludge and chemicals;

[0041] The stirring shaft 3 is rotatably arranged in the mixing tank 2, and two L-shaped stirring blades 7 are symmetrically arranged at the bottom of the stirring shaft 3. The two L-shaped stirring blades 7 and the stirring shaft 3 form an anchor stirrer. The anchor stirrer is used to perform low-speed and high-torque stirring at the initial high-viscosity stage of the oily sludge to ensure uniform dispersion of the reagent;

[0042] A folding assembly 4 is provided on the stirring shaft 3 and connected to an L-shaped stirring blade 7. The L-shaped stirring blade 7 is foldable. The folding assembly 4 drives the L-shaped stirring blade 7 to deflect and fold to form a turbine-type agitator. The turbine-type agitator is used to perform high-speed shear stirring after the viscosity of the oily sludge is reduced, thereby accelerating the aggregation of oil droplets and the formation of flocs.

[0043] A driving member 5 is provided on the mixing tank 2 and connected to the stirring shaft 3, and is used to drive the stirring shaft 3 to rotate;

[0044] The subsequent dehydration treatment unit 6 is connected to the sludge pretreatment equipment 1 and is used to further dehydrate the pretreated oily sludge to obtain a dehydrated mud cake and a recovered oil phase;

[0045] Specifically, the device utilizes an anchor-type agitator formed by the unfolded L-shaped stirring blades 7 to perform low-speed, high-torque stirring at the initial high-viscosity stage of the waste oil sludge, ensuring uniform dispersion of the reagent. After the raw materials have been uniformly mixed and reacted for a period of time, the viscosity decreases. At this time, the folding component 4 drives the L-shaped stirring blades 7 to fold back and form a turbine-type agitator to perform high-speed shear stirring, accelerate oil droplet aggregation and floc formation, thereby reducing energy consumption and shortening the treatment cycle.

[0046] At the same time, when the stirrer is in the folded state, the rectangular stirring blades 59 are in an inclined state, thereby providing a certain axial circulation for the mixing of the raw materials, thereby improving the mixing effect.

[0047] The folding assembly 4 includes a hollow cylinder 41 fixedly connected to the bottom end of the stirring shaft 3, and the L-shaped stirring blade 7 adopts a split design, which includes a rectangular blade 42 fixedly connected to the hollow cylinder 41, one end of the rectangular blade 42 is rotatably connected to a deflection plate 43, and one end of the deflection plate 43 is rotatably connected to an L-shaped blade 44;

[0048] A shaft 45 is rotatably connected to both ends of the deflection plate 43. The two shafts 45 are fixedly connected to one end of the rectangular blade 42 and the L-shaped blade 44 respectively. A toothed disc 46 is fixedly connected to the two shafts 45. The two toothed discs 46 are meshed with each other. A protective shell 77 is fixedly connected to the deflection plate 43. The two toothed discs 46 are located in the protective shell 77 and are slidably connected to the inner wall thereof for protecting the toothed disc 46. The protective shell 77 is slidably connected to the rectangular blade 42 and the L-shaped blade 44. The hollow cylinder 41 is provided with a A pushing member 47 connected to the deflection plate 43 is provided for pushing the deflection to drive the L-shaped blade 44 to deflect and retract. Specifically, in the process of pushing the deflection plate 43 to rotate relative to the rectangular blade 42, the gear plate 1 46 connected to the L-shaped blade 44 is driven to roll along the gear plate 1 46 connected to the rectangular blade 42, thereby synchronously driving the L-shaped blade 44 to deflect relative to the deflection plate 43. When the deflection plate 43 deflects ninety degrees, the L-shaped blade 44 also deflects ninety degrees relative to the deflection plate 43, and then folds to the side of the rectangular blade 42.

[0049] The pusher 47 includes an inclined plate 48 fixedly connected to the deflection plate 43. A push rod 49 is slidably connected to the rectangular blade 42. One end of the push rod 49 is fixedly connected to a hollow rectangular plate 51. A second shaft 52 with one end located inside the hollow rectangular plate 51 is rotatably connected to the inclined plate 48. The second shaft 52 is slidably connected to the inner wall of the hollow rectangular plate 51. When the push rod 49 is moved, the hollow rectangular plate 51 is used to push the inclined plate 48 and the deflection plate 43 to deflect.

[0050] A round rod 53 is slidably connected to the stirring shaft 3. One end of the round rod 53 is located in the hollow cylinder 41 and is fixedly connected to the shaft 3 54. One end of the push rod 49 is located in the hollow cylinder 41 and is fixedly connected to the connecting plate 55. The push rod 49 is slidably connected to the inner wall of the hollow cylinder 41. A connecting rod 1 64 is rotatably connected between the connecting plate 55 and the shaft 3 54. Pushing the round rod 53 drives the shaft 3 54 to move, and then the connecting rod 1 64 is used to push the connecting plate 55 and the push rod 49 to move.

[0051] An electric push rod 57 is also provided on the mixing tank 2. The electric push rod 57 is fixedly connected to the outer casing of the driving motor 66. The extended end of the electric push rod 57 is fixedly connected to an L-shaped push plate 58, and one end of the L-shaped push plate 58 is rotatably connected to the round rod 53. Starting the electric push rod 57 drives the L-shaped push plate 58 to move, and then drives the round rod 53 to move.

[0052] Two rectangular stirring blades 59 are symmetrically arranged on the hollow cylinder 41, and one end of the rectangular stirring blade 59 is fixedly connected to the fourth shaft 61, and the fourth shaft 61 is rotatably connected to the hollow cylinder 41. A linkage 62 is provided between the fourth shaft 61 and the connecting plate 55, and the linkage 62 includes a swing plate 63 fixedly connected to one end of the fourth shaft 61. The swing plate 63 and the connecting plate 55 are rotatably connected by a connecting rod 2 64 through a rotating shaft. When the connecting plate 55 moves, the fourth shaft 61 is driven to rotate. In the initial stage of the device, the rectangular stirring blade 59 is parallel to its rotation direction, thereby reducing the resistance it generates when the stirring shaft 3 rotates. When the L-shaped blade 44 is folded, the movement of the connecting plate 55 is used to drive the connecting rod 2 64 to move, thereby driving the swing plate 63 and the fourth shaft 61 to deflect, so as to drive the rectangular stirring blade 59 to deflect and tilt. Therefore, during the middle and late stages of stirring and mixing, the tilted rectangular stirring blade 59 provides a certain axial circulation for the mixing of the raw materials when it rotates, thereby improving the mixing effect.

[0053] The driving member 5 includes a mounting frame 65 fixedly connected to the mixing tank 2, a driving motor 66 fixedly connected to the mounting frame 65, a gear disc 2 67 fixedly connected to the stirring shaft 3, a hollow shaft 5 68 sleeved on the output shaft of the driving motor 66, a gear disc 3 69 meshing with the gear disc 2 67 fixedly connected to the hollow shaft 5 68, and the driving motor 66 is started to drive the hollow shaft 5 68 and the gear disc 3 69 to rotate, thereby driving the gear disc 2 67 and the stirring shaft 3 to rotate.

[0054] The stirring shaft 3 is also fixedly connected with a toothed disc 3 69, and the hollow shaft 5 68 is also fixedly connected with a toothed disc 2 67, and the toothed disc 2 67 is designed to have a diameter larger than that of the toothed disc 3 69. A slide groove 71 is provided on the output shaft of the driving motor 66, and a sliding protrusion 72 with one end located in the slide groove 71 is fixedly connected to the inner wall of the hollow shaft 5 68. The sliding protrusion 72 is slidably connected to the inner wall of the slide groove 71, and one end of the L-shaped push plate 58 is rotatably connected to the hollow shaft 5 68. At the initial stage of the device working, the toothed disc 2 67 on the stirring shaft 3 is meshed with the toothed disc 3 69 on the hollow shaft 5 68. At this time, the driving motor 66 will drive the stirring shaft 3 at a speed lower than that of the driving motor. The speed of the machine 66 is to match the low-speed and high-torque working condition required by the high viscosity characteristics of the oily sludge in the initial stage of stirring. In the later stage of the device operation, while the L-shaped blade 44 is folded, the electric push rod 57 drives the L-shaped push plate 58 to move, so as to drive the gear disc 2 67 on the hollow shaft 5 68 to engage with the gear disc 3 69 on the stirring shaft 3. At the same time, the gear disc 3 69 on the hollow shaft 5 68 is disengaged from the gear disc 2 67 on the stirring shaft 3. Then the drive motor 66 will drive the stirring shaft 3 to operate at a speed higher than the speed of the drive motor 66, thereby matching the high-speed and low-torque working condition required for the low viscosity characteristics of the oily sludge in the middle and late stages of stirring.

[0055] The mixing tank 2 is provided with a heating unit 73 for heating the oily sludge to reduce its viscosity and promote chemical reactions;

[0056] The heating unit 73 includes a hollow layer 74 provided on the mixing tank 2 . Two pipes are conductively connected to the hollow layer 74 . The two pipes are conductively connected to an external circulating hot water supply device.

[0057] The subsequent dehydration treatment unit 6 includes a centrifugal dehydrator 75 connected to the mixing tank 2 through a conduit, and is used to separate water from the oily sludge by centrifugal force.

[0058] Example 2: Please refer to Figures 1-12 , the present invention provides a technical solution: Example 2 is optimized based on Example 1;

[0059] An online viscometer 76 is installed on the mixing tank 2. The online viscometer 76 is electrically connected to the controller of the electric push rod 57 and is used to measure the viscosity of the oily sludge in real time. During the conditioning process of the oily sludge, the viscometer monitors the viscosity of the material in the mixing tank 2 in real time. When the viscosity value reaches the preset threshold, the controller automatically triggers the electric push rod 57 to drive the agitator to fold to adjust the stirring mode, ensuring that a high-speed shear process is adopted in the low viscosity stage, thereby realizing dynamic process adaptation and energy consumption optimization.

[0060] It should be noted that, in this document, relational terms such as first and second, etc., are used only to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between these entities or operations. Moreover, the terms "comprises," "comprising," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that includes a list of elements includes not only those elements but also other elements not explicitly listed, or elements inherent to such process, method, article, or apparatus.

[0061] While the embodiments of the present invention have been shown and described, it will be apparent to those skilled in the art that various changes, modifications, substitutions, and alterations can be made to the embodiments without departing from the principles and spirit of the invention.

Claims

1. A system for dehydrating oily sludge, characterized in that: include: The sludge pretreatment device (1) is used for pretreating oily sludge to reduce its viscosity and promote oil-water separation. The sludge pretreatment device (1) comprises: A mixing tank (2) for containing oily sludge and chemicals; A stirring shaft (3) is rotatably arranged in the mixing and stirring tank (2), and two L-shaped stirring blades (7) are symmetrically arranged at the bottom end of the stirring shaft (3), and the two L-shaped stirring blades (7) and the stirring shaft (3) form an anchor stirrer; A folding assembly (4) is arranged on the stirring shaft (3) and connected to the L-shaped stirring blade (7), wherein the L-shaped stirring blade (7) is foldable, and the folding assembly (4) drives the L-shaped stirring blade (7) to deflect and fold, thereby forming a turbine stirrer; A driving member (5) is provided on the mixing and stirring tank (2) and is connected to the stirring shaft (3), and is used to drive the stirring shaft (3) to rotate; The subsequent dehydration treatment unit (6) is connected to the sludge pretreatment equipment (1) and is used to further dehydrate the pretreated oily sludge to obtain a dehydrated mud cake and a recovered oil phase.

2. The oily sludge dewatering treatment system according to claim 1, characterized in that: The folding assembly (4) includes a hollow cylinder (41) fixedly connected to the bottom end of the stirring shaft (3), and the L-shaped stirring blade (7) adopts a split design, which includes a rectangular blade (42) fixedly connected to the hollow cylinder (41), one end of the rectangular blade (42) is rotatably connected to a deflection plate (43), and one end of the deflection plate (43) is rotatably connected to an L-shaped blade (44); A shaft (45) is rotatably connected to both ends of the deflection plate (43), and the two shafts (45) are fixedly connected to the rectangular blade (42) and the L-shaped blade (44) respectively. A toothed disc (46) is fixedly connected to the two shafts (45), and the two toothed discs (46) are meshed. A pushing member (47) connected to the deflection plate (43) is provided on the hollow cylinder (41) for pushing the deflection to drive the L-shaped blade (44) to deflect and retract.

3. The oily sludge dewatering treatment system according to claim 2, characterized in that: The pushing member (47) includes an inclined plate (48) fixedly connected to the deflection plate (43); a push rod (49) is slidably connected to the rectangular blade (42); one end of the push rod (49) is fixedly connected to a hollow rectangular plate (51); the inclined plate (48) is rotatably connected to a second shaft (52) with one end located in the hollow rectangular plate (51); and the push rod (49) is moved to drive the deflection plate (43) to deflect; A round rod (53) is slidably connected in the stirring shaft (3), one end of the round rod (53) is located in the hollow cylinder (41) and is fixedly connected to the shaft three (54), and one end of the push rod (49) is located in the hollow cylinder (41) and is fixedly connected to the connecting plate (55), and a connecting rod (64) is rotatably connected between the connecting plate (55) and the shaft three (54), pushing the round rod (53) to drive the push rod (49) to move; An electric push rod (57) is provided on the mixing tank (2), an extended end of the electric push rod (57) is fixedly connected to an L-shaped push plate (58), and one end of the L-shaped push plate (58) is rotatably connected to the round rod (53), and the electric push rod (57) is started to drive the round rod (53) to move.

4. The oily sludge dewatering treatment system according to claim 3, characterized in that: Two rectangular stirring blades (59) are symmetrically arranged on the hollow cylinder (41), one end of the rectangular stirring blade (59) is fixedly connected to a fourth shaft (61), the fourth shaft (61) is rotatably connected to the hollow cylinder (41), and a linkage member (62) is provided between the fourth shaft (61) and the connecting plate (55). In the initial working stage of the device, the rectangular stirring blade (59) is parallel to its rotation direction. When the L-shaped blade (44) is folded, the linkage member (62) is used to drive the fourth shaft (61) to rotate so as to drive the rectangular stirring blade (59) to deflect and tilt.

5. The oily sludge dewatering treatment system according to claim 4, characterized in that: The linkage member (62) includes a swing plate (63) fixedly connected to one end of the fourth shaft (61), and a second connecting rod (64) is rotatably connected between the swing plate (63) and the connecting plate (55), which drives the fourth shaft (61) to rotate when the connecting plate (55) moves.

6. The oily sludge dewatering treatment system according to claim 5, characterized in that: The driving member (5) comprises a mounting frame (65) fixedly connected to the mixing and stirring tank (2), a driving motor (66) fixedly connected to the mounting frame (65), a second toothed disc (67) fixedly connected to the stirring shaft (3), a fifth hollow shaft (68) provided on the output shaft of the driving motor (66), a third toothed disc (69) meshing with the second toothed disc (67) fixedly connected to the fifth hollow shaft (68), and the driving motor (66) is started to drive the stirring shaft (3) to rotate.

7. The oily sludge dewatering treatment system according to claim 6, characterized in that: The stirring shaft (3) is also fixedly connected with a toothed disc three (69), and the hollow shaft five (68) is also fixedly connected with a toothed disc two (67), and the toothed disc two (67) is designed to have a diameter larger than that of the toothed disc three (69); A slide groove (71) is provided on the output shaft of the driving motor (66), and a sliding protrusion (72) with one end located in the slide groove (71) is fixedly connected to the inner wall of the hollow shaft (68). One end of the L-shaped push plate (58) is rotatably connected to the hollow shaft (68). At the initial stage of operation of the device, the second toothed disc (67) on the stirring shaft (3) is engaged with the third toothed disc (69) on the hollow shaft (68). When the L-shaped blade (44) is folded, the L-shaped push plate (58) moves to drive the second toothed disc (67) on the hollow shaft (68) to move and engage with the third toothed disc (69) on the stirring shaft (3). At the same time, the third toothed disc (69) on the hollow shaft (68) is disengaged from the second toothed disc (67) on the stirring shaft (3).

8. The oily sludge dewatering treatment system according to claim 1, characterized in that: The mixing and stirring tank (2) is provided with a heating unit (73) for heating the oily sludge to reduce its viscosity and promote chemical reactions; The heating unit (73) comprises a hollow layer (74) arranged on the mixing and stirring tank (2), and two pipes are conductively connected to the hollow layer (74), and the two pipes are conductively connected to external circulating hot water supply equipment.

9. The oily sludge dewatering treatment system according to claim 8, characterized in that: The subsequent dehydration treatment unit (6) includes a centrifugal dehydrator (75) for separating water from the oily sludge by centrifugal force.

10. The oily sludge dewatering treatment system according to claim 1, characterized in that: The mixing tank (2) is provided with an online viscometer (76), which is electrically connected to the controller of the electric push rod (57) and is used to measure the viscosity of the oily sludge in real time.

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