A multi-stage oilfield sewage treatment device

Abstract

The application discloses an oilfield multistage sewage treatment device and belongs to the technical field of sewage treatment. Mainly comprising a pool body, a coagulation tank, a flocculation tank, a gas floatation tank and a clean water tank are sequentially arranged in the pool body, a slag scraping part is arranged on the gas floatation tank, an equipment box is further arranged on the pool body, a reciprocating screw rod is mounted on a bearing in the equipment box, a meshing part is arranged on the reciprocating screw rod, two groups of guide rods are mounted in the equipment box, a mounting plate is slidably arranged on the guide rods, and the mounting plate is drivingly arranged on the reciprocating screw rod. A pushing plate is arranged on the mounting plate, and the bottom of the pushing plate is adapted to be in contact with the bottom of the slag storage tank to scrape off the floating slag. The oilfield multistage sewage treatment device can scrape off the accumulated waste slag in the slag storage tank while scraping the floating slag generated in the sewage treatment into the slag storage tank through the cooperation of the meshing part and the gear ring, thereby achieving the effect that the waste slag in the slag storage tank is cleaned while the floating slag is scraped off by the scraper.

Description

Technical Field

[0001] This application relates to the field of wastewater treatment technology, specifically to a multi-stage wastewater treatment device for oil fields. Background Technology

[0002] Wastewater treatment equipment is a device or system used to treat and purify wastewater, with the aim of removing pollutants from the wastewater to meet discharge standards or reuse requirements;

[0003] For example, the patent with publication number CN110902928A specifically discloses a high-efficiency multi-stage wastewater treatment for oil fields. The treatment device uses a pump to introduce oil field wastewater into the anti-coagulation tank of the pretreatment mechanism and heat it. At the same time, the floating matter treatment mechanism collects the floating matter into the floating matter placement tank. The baffle plate and the baffle plate are opened, and the treatment agent in the treatment agent tank falls into the water. After being stirred in the mixing tank, the wastewater enters the filtration treatment mechanism through the outlet tank. The debris in the wastewater that cannot pass through the inclined filter plate is collected into the debris placement tank.

[0004] Since oilfield wastewater treatment is a continuous process, the impurities generated during the treatment will gradually increase and accumulate in the waste storage tank. Although the above-mentioned patent can treat oilfield wastewater, it is difficult to deal with the impurities accumulated in the waste storage tank in a timely manner. It can only be cleaned manually on a regular basis, which may result in the subsequent waste not being discharged in time or flowing back to the previous process.

[0005] Therefore, it is necessary to provide a multi-stage wastewater treatment device for oil fields to solve the above problems.

[0006] It should be noted that the information disclosed in this background section is only for understanding the background technology of this application concept, and therefore may include information that does not constitute prior art. Summary of the Invention

[0007] Based on the aforementioned problems in the existing technology, the problem to be solved by this application is to provide a multi-stage wastewater treatment device for oil fields, which achieves the effect of scraping off floating scum with a scraper while cleaning the waste scum in the scum storage tank.

[0008] The technical solution adopted by this application to solve its technical problem is as follows: a multi-stage wastewater treatment device for oil fields, including a tank body, inside which a coagulation tank, a flocculation tank, an air flotation tank, and a clear water tank are arranged sequentially, and a sludge storage tank is arranged at the end of the air flotation tank; a sludge scraping part is arranged on the air flotation tank, the sludge scraping part includes two sets of rotating shafts with bearings installed on the top of the air flotation tank, two sets of second chain drive parts are jointly driven on the two sets of rotating shafts, and multiple sets of scrapers are jointly installed on the two sets of second chain drive parts; a stepper motor is arranged on the tank body, and the output end of the stepper motor is fixed. A rotating rod is installed, and a first chain drive unit is jointly configured on the rotating rod and one of the sets of rotating shafts. A toothed ring is fixedly installed at one end of the rotating rod. An equipment box is also installed on the pool body. A reciprocating screw is installed on the bearing inside the equipment box. The reciprocating screw is provided with a meshing part, which is adapted to mesh with the toothed ring. Two sets of guide rods are installed inside the equipment box. Mounting plates are slidably mounted on the guide rods. The mounting plates are driven by the reciprocating screws. A pusher plate is provided on the mounting plate. The bottom of the pusher plate is adapted to contact the bottom of the slag storage pool to scrape off the scum.

[0009] Furthermore, a housing is mounted on one end of the mounting plate, and a servo motor is mounted on the top of the mounting plate. The output end of the servo motor extends into the interior of the housing. A round rod is rotatably mounted on the housing. A belt drive assembly is provided for the joint transmission of the round rod and the output end of the servo motor. The belt drive assembly is located inside the housing. A fixing block is mounted on one end of the round rod. A groove is provided on the fixing block, and a pusher plate is slidably disposed inside the groove.

[0010] Furthermore, a first spring is provided between the groove and the pusher plate. A support rod is provided on the groove, with one end of the support rod extending into the interior of the pusher plate. Two sets of connecting rods are slidably provided inside the pusher plate. A mounting bracket is installed at the bottom of each set of connecting rods, and at least two sets of striking heads are provided at the bottom of the mounting bracket.

[0011] Furthermore, the pusher plate has a groove inside, and the mounting bracket is slidably set in the groove. Two sets of second springs are set between the groove and the mounting bracket. The second springs are sleeved on the outside of the connecting rod. A vertical rod is installed on one of the connecting rods. The top of the vertical rod extends out of the top of the pusher plate, and a top block is installed on the top of the vertical rod.

[0012] Furthermore, the meshing part includes a support block installed inside the equipment box, a hydraulic cylinder installed on the top of the support block, a locking block installed at the output end of the hydraulic cylinder, a locking groove opened on the locking block, an extension rod provided at one end of the reciprocating screw, a key block provided on the extension rod, a cylinder slidably provided on the key block, the cylinder having a cap located inside the locking groove, a gear installed on the cylinder, and the gear slidably provided on the extension rod.

[0013] Furthermore, a pad is installed on the pool body, a stepper motor is installed on the pad, a slag discharge port is provided on the slag storage pool, one end of the rotating rod extends into the inside of the equipment box, the gear ring is located inside the equipment box, a water inlet pipe is provided on the pool body, one end of the water inlet pipe extends into the inside of the coagulation pool, an overflow port is provided through the upper part between the coagulation pool and the flocculation pool, and a stirring section is provided above both the coagulation pool and the flocculation pool.

[0014] Furthermore, a dissolved air pump is installed on the tank body, and the output end of the dissolved air pump is connected to a dissolved air tank. The dissolved air tank is installed on the tank body, and an air flotation pipe is installed at the outlet of the dissolved air tank. At least two sets of aeration release sections are installed inside the air flotation tank, and the aeration release sections are connected to the air flotation pipes through pipes.

[0015] Furthermore, the flocculation tank and the flotation tank are connected by a drain outlet at their lower parts. The flotation tank is equipped with a baffle plate located on one side of the aeration release section. The two ends of the baffle plate along its long side are attached to the inner wall of the flotation tank to form an aeration tank.

[0016] Furthermore, at least two sets of water collection pipes are provided between the clear water tank and the flotation tank, and at least two sets of water collection holes are opened on the outer surface of the water collection pipes. An outlet is provided on the clear water tank.

[0017] Furthermore, a return pipe is installed on the outlet, one end of which is connected to the input end of the dissolved air pump. An outlet pipe is installed inside the clear water tank, located at the top of the clear water tank.

[0018] The beneficial effects of this application are: the multi-stage wastewater treatment device for oil fields provided by this application, through the cooperation of the meshing part and the toothed ring, enables the scraper to scrape the floating scum generated by wastewater treatment into the slag storage tank, and at the same time scrape off the excessive waste scum accumulated in the slag storage tank, so as to achieve the effect of cleaning the waste scum in the slag storage tank while scraping off the floating scum.

[0019] In addition to the purposes, features, and advantages described above, this application has other purposes, features, and advantages. A further detailed description of this application will be provided below with reference to the figures. Attached Figure Description

[0020] The accompanying drawings, which form part of this application, are used to provide a further understanding of this application. The illustrative embodiments and descriptions of this application are used to explain this application and do not constitute an undue limitation of this application. In the drawings:

[0021] Figure 1 This is an overall schematic diagram of a multi-stage wastewater treatment device for oil fields according to this application;

[0022] Figure 2 for Figure 1 Enlarged view of point A in the middle;

[0023] Figure 3 for Figure 1 A partial overall diagram from another perspective;

[0024] Figure 4 for Figure 1 A schematic diagram of the overall structure of the middle section;

[0025] Figure 5 for Figure 4 Enlarged view of point B in the middle;

[0026] Figure 6 for Figure 4 A structural diagram from another perspective;

[0027] Figure 7 for Figure 6 Enlarged view of point C in the middle;

[0028] Figure 8 for Figure 6 A partial sectional view of the entire structure;

[0029] Figure 9 for Figure 8 Enlarged view of point D in the middle;

[0030] Figure 10 for Figure 8 Enlarged view of point E in the middle;

[0031] Figure 11 for Figure 8 A side view of the central section as a whole;

[0032] Figure 12 for Figure 11 Another schematic diagram of the overall state;

[0033] The following are the labeling elements in the figure:

[0034] 1. Pool body;

[0035] 2. Treatment components; 21. Inlet pipe; 22. Coagulation tank; 23. Overflow outlet; 24. Flocculation tank; 241. Drain outlet; 25. Mixing section; 26. Baffle; 261. Flotation pipe; 262. Aeration release section; 263. Aeration tank; 27. Flotation tank; 28. Water collection pipe; 29. ​​Sludge scraper;

[0036] 3. Scraper; 31. Pad; 32. Stepper motor; 33. Rotating rod; 34. First chain drive unit; 35. Rotating shaft; 36. Second chain drive unit;

[0037] 4. Clear water tank; 41. Water outlet pipe; 42. Slag discharge port; 43. Return pipe; 44. Dissolved air pump; 45. Dissolved air tank; 46. Slag storage tank;

[0038] 5. Cleaning components; 51. Equipment box; 501. Clearance groove; 52. Guide rod; 53. Reciprocating screw; 54. Mounting plate; 55. Servo motor; 56. Housing; 57. Round rod; 58. Top block; 59. Vertical rod; 6. Fixing block; 601. Push plate; 61. Groove; 62. Support rod; 63. First spring; 64. Connecting rod; 65. Second spring; 66. Slide groove; 67. Mounting bracket; 68. Striking head; 7. Engaging part; 71. Support block; 72. Hydraulic cylinder; 73. Clamping block; 74. Key block; 75. Cylinder; 76. Gear; 77. Gear ring; 78. Extension rod. Detailed Implementation

[0039] It should be noted that, unless otherwise specified, the embodiments and features described in this application can be combined with each other. This application will now be described in detail with reference to the accompanying drawings and embodiments.

[0040] To enable those skilled in the art to better understand the present application, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present application, and not all embodiments. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative effort should fall within the scope of protection of the present application.

[0041] Example 1: As Figures 1-3 As shown, this application provides a multi-stage wastewater treatment device for oil fields, including a tank 1, inside which a treatment component 2 is installed. The treatment component 2 is suitable for treating oilfield wastewater. Specifically:

[0042] The treatment component 2 includes an inlet pipe 21 arranged sequentially on the pool body 1. The pool body 1 contains a coagulation tank 22, a flocculation tank 24, an air flotation tank 27, and a clear water tank 4. One end of the inlet pipe 21 extends into the interior of the coagulation tank 22 so that oilfield wastewater can be introduced into the coagulation tank 22 through the inlet pipe 21.

[0043] An overflow outlet 23 is provided in the upper part between the coagulation tank 22 and the flocculation tank 24, so that after the sewage in the coagulation tank 22 accumulates to a certain height, it can flow into the flocculation tank 24 through the overflow outlet 23.

[0044] A stirring unit 25 is provided above both the coagulation tank 22 and the flocculation tank 24. The stirring unit 25 includes a crossbeam frame installed on the coagulation tank 22. A motor is fixedly installed on the crossbeam frame, and a stirring rod is installed at the output end of the motor to facilitate starting the motor and driving the stirring rod to rotate, thereby stirring the sewage in the coagulation tank 22 and the flocculation tank 24. At this time, chemicals can be added to the coagulation tank 22 and the flocculation tank 24 to stir the chemicals and sewage.

[0045] A dissolved air pump 44 is fixedly installed on the tank body 1. The output end of the dissolved air pump 44 is connected to a dissolved air tank 45. The dissolved air tank 45 is installed on the tank body 1, and an air flotation pipe 261 is provided at the outlet of the dissolved air tank 45. Multiple aeration release sections 262 are provided inside the air flotation tank 27. The aeration release sections 262 are connected to the air flotation pipes 261 through pipes.

[0046] Meanwhile, a drain outlet 241 is provided through the lower part of both the flocculation tank 24 and the flotation tank 27, and a baffle 26 is provided inside the flotation tank 27. The baffle 26 is located on one side of the aeration release section 262, and the two ends of the long side of the baffle 26 are attached to the inner wall of the flotation tank 27 to form an aeration tank 263.

[0047] It should be noted that the highest point of the baffle 26 is lower than the highest point of the flotation tank 27, so that the mixed wastewater can enter the aeration tank 263 in the flotation tank 27 through the drain outlet 241. Multiple sets of air bubbles are released into the aeration tank 263 through the dissolved air pump 44 and the dissolved air tank 45, which then encapsulate the suspended solids after the wastewater is flocculated and flow to the upper end of the aeration tank 263 under the action of the air bubble flotation principle, and flow into the flotation tank 27. At the same time, due to the continuous introduction of wastewater, the wastewater and suspended solids will enter the flotation tank 27 simultaneously. At this time, the suspended solids will float upward in the flotation tank 27, causing them to accumulate on the upper surface of the flotation tank 27 to form scum, while some larger impurities will settle at the bottom of the flotation tank 27.

[0048] Multiple sets of water collection pipes 28 are provided between the clear water tank 4 and the flotation tank 27. Multiple sets of water collection holes (not shown in the figure) are opened on the outer surface of the water collection pipes 28 so that the clear water in the flotation tank 27 can enter the clear water tank 4 through the water collection holes.

[0049] An outlet is provided on the clear water tank 4, and a return pipe 43 is provided on the outlet. One end of the return pipe 43 is connected to the input end of the dissolved air pump 44 so that part of the treated clear water can be introduced into the dissolved air tank 45 for recycling through the dissolved air pump 44.

[0050] A water outlet pipe 41 is installed inside the clear water tank 4. The water outlet pipe 41 is located at the top of the clear water tank 4. When the clear water in the clear water tank 4 submerges the water outlet pipe 41, the clear water tank 4 can be discharged through the water outlet pipe 41.

[0051] Continue to refer to Figures 1-3 A sludge scraping section 29 is provided on the flotation tank 27. The sludge scraping section 29 includes two sets of rotating shafts 35 with bearings installed on the top of the flotation tank 27. Two sets of second chain drive sections 36 are jointly driven on the two sets of rotating shafts 35. Multiple sets of scraper blades 3 are jointly installed on the two sets of second chain drive sections 36. The multiple sets of scraper blades 3 are evenly arranged along the transmission direction.

[0052] A pad 31 is fixedly installed on the tank body 1. A stepper motor 32 is fixedly installed on the pad 31. A rotating rod 33 is fixedly installed on the output end of the stepper motor 32. A first chain drive part 34 is provided on the rotating rod 33 and one of the rotating shafts 35. A slag storage tank 46 is provided at the end of the flotation tank 27 away from the aeration tank 263. A slag discharge port 42 is provided on the slag storage tank 46.

[0053] It should be noted that the scraper 3 is located above the flotation tank 27. Driven by the stepper motor 32, it drives the rotating shaft 35 to rotate through the first chain drive 34, which in turn drives the two sets of second chain drive 36 to move. The scraper 3 moves from the end of the flotation tank 27 near the aeration tank 263 to the sludge storage tank 46 along the movement direction of the second chain drive 36. As the scraper 3 moves, it can scrape the suspended matter on the upper surface of the flotation tank 27 and scrape it into the sludge storage tank 46, and then discharge it through the sludge discharge port 42.

[0054] Example 2: Although the above example can achieve the treatment of oilfield wastewater, during the treatment process, since the treatment of oilfield wastewater is continuous, the impurities generated during the treatment process will gradually increase, and the scraper 3 is running continuously, which causes the scum to be continuously scraped into the scum storage tank 46. This may result in the scum discharge efficiency in the scum storage tank 46 being less than the scum entry efficiency, causing the scum to accumulate in the scum storage tank 46. As the scum accumulates, it may block the scum discharge port 42, requiring manual cleaning periodically. This may result in subsequent scum not being discharged in time or flowing back to the previous process.

[0055] To solve this problem, such as Figure 2 and Figures 4-7 As shown, a cleaning component 5 is provided inside the slag storage tank 46, which is adapted to discharge the slag in the slag storage tank 46.

[0056] The cleaning component 5 includes an equipment box 51 fixedly installed on the pool body 1. A reciprocating screw 53 is installed inside the equipment box 51, and an engagement part 7 is provided inside the equipment box 51. The engagement part 7 includes a support block 71 fixedly installed inside the equipment box 51. A hydraulic cylinder 72 is fixedly installed on the top of the support block 71. A locking block 73 is fixedly installed on the output end of the hydraulic cylinder 72. A locking groove is provided on the locking block 73.

[0057] An extension rod 78 is provided at one end of the reciprocating lead screw 53. A key block 74 is provided on the extension rod 78. A cylinder 75 is slidably provided on the key block 74. The cylinder 75 has a brim, which is located inside the slot. A gear 76 is fixedly installed on the cylinder 75 and is slidably provided on the extension rod 78.

[0058] So that the hydraulic cylinder 72 can drive the locking block 73 to move until the locking slot of the locking block 73 abuts against the cap of the cylinder 75, and drive the cap to move, thereby driving the gear 76 to move.

[0059] Continue to refer to Figure 5 One end of the rotating rod 33 extends into the interior of the equipment box 51, and a toothed ring 77 is fixedly installed at the end of the rotating rod 33 that extends into the equipment box 51. The toothed ring 77 is located at one end of the extension rod 78.

[0060] It should be noted that one end of the extension rod 78 and the key block 74 both extend into the center of the gear ring 77, so that when the gear 76 moves, it can enter the center of the gear ring 77 and mesh with the gear ring 77, thereby driving the gear 76 to rotate, which in turn drives the cylinder 75 to rotate. At this time, due to the action of the key block 74, the cylinder 75 will drive the reciprocating screw 53 to rotate, and the slot will not interfere with the rotation of the cylinder 75.

[0061] In this application, a guide slope can be provided on the side of the gear 76 and the gear ring 77 that are close to each other, so that they can be smoothly engaged even if they are misaligned.

[0062] Two sets of guide rods 52 are fixedly installed inside the equipment box 51. A mounting plate 54 is slidably mounted on the guide rod 52. The mounting plate 54 is driven on the reciprocating screw 53. When the reciprocating screw 53 rotates, it will drive the mounting plate 54 to reciprocate along the axis of the reciprocating screw 53. Under the restriction of the guide rods 52, its movement direction is restricted.

[0063] Continue to refer to Figure 7 A servo motor 55 is fixedly mounted on the mounting plate 54, and a housing 56 is fixedly mounted on one end of the mounting plate 54. The bottom end of the housing 56 extends into the interior of the slag storage tank 46, and a round rod 57 is rotatably mounted on the housing 56. At the same time, the output end of the servo motor 55 extends into the interior of the housing 56, and a belt drive assembly is jointly set on the output end of the servo motor 55 and the round rod 57. Thus, under the drive of the servo motor 55, the round rod 57 is driven to rotate through the belt drive assembly.

[0064] It should be noted that an avoidance groove 501 is provided on the side of the equipment box 51 to facilitate the sliding avoidance of the mounting plate 54, and the equipment box 51 can prevent the large-area contamination of the reciprocating screw 53 and gear 76 by floating scum, so as to protect them.

[0065] A fixing block 6 is fixedly installed on the round rod 57. A groove 61 is provided on the fixing block 6. A pusher plate 601 is installed inside the groove 61. The pusher plate 601 is slidably disposed inside the slag storage tank 46.

[0066] When the mounting plate 54 moves back and forth, it will drive the servo motor 55, the round rod 57 and the fixed block 6 to move, which in turn drives the pusher plate 601 to move, thereby pushing the scum accumulated in the scum storage tank 46 toward the scum discharge port 42. After the pusher plate 601 is pushed, it will be driven by the reciprocating screw 53 to reset.

[0067] It should be noted that the bottom of the slag storage tank 46 is set horizontally, so that a slag outlet with the same structure as the slag discharge port 42 is set on the other side of the slag storage tank 46, so that the material pushed by the pusher plate 601 during the resetting process can be pushed to the slag outlet for discharge.

[0068] In summary, when the scum in the slag storage tank 46 accumulates to a certain extent, the meshing part 7 is activated to engage the gear 76 and the gear ring 77, thereby driving the reciprocating screw 53 to rotate. This, in turn, drives the pusher plate 601 to move via the mounting plate 54, thus pushing the scum in the slag storage tank 46. This allows the scraping part 29 to scrape the scum while simultaneously pushing the scum in the slag storage tank 46 to the slag discharge port 42, accelerating the discharge of the scum and enabling the periodic cleaning of the scum in the slag storage tank 46.

[0069] Example 3: When the accumulated scum is discharged, the scum near the scum discharge port 42 is usually discharged first. At the same time, due to the continuous operation of the processing component 2, the scum it generates will be continuously discharged into the scum storage tank 46. After the scum near the scum discharge port 42 is discharged from top to bottom, the scum newly scraped into the scum storage tank 46 will cover the scum discharge port 42 again, which will result in the scum in the scum storage tank 46 that is far from the scum discharge port 42 being discharged more slowly.

[0070] Furthermore, when facing cold weather, the bottom scum is discharged relatively slowly. Due to the long interval between regular cleaning and the high water content of the scum, it may freeze due to the low temperature. If too much scum freezes, the scum discharge port 42 may be frozen, and the liquid level in the scum storage tank 46 will continue to rise, which may backflow into the treatment component 2, thereby affecting the treatment efficiency.

[0071] To solve this problem, such as Figures 7-10 As shown, the pusher plate 601 is slidably disposed in the groove 61, and a first spring 63 is provided between the groove 61 and the pusher plate 601. At the same time, a support rod 62 is provided on the groove 61. One end of the support rod 62 is slidably inserted into the interior of the pusher plate 601 so that the pusher plate 601 can be driven to move upward under the action of external force, thereby compressing the first spring 63. After the external force disappears, the pusher plate 601 is driven to reset under the action of the restoring force of the first spring 63.

[0072] Two sets of connecting rods 64 are slidably arranged inside the pusher plate 601. A mounting bracket 67 is fixedly installed at the bottom of each set of connecting rods 64. Multiple sets of striking heads 68 are provided at the bottom of the mounting bracket 67. A sliding groove 66 is opened inside the pusher plate 601. The mounting bracket 67 is slidably arranged in the sliding groove 66. Two sets of second springs 65 are provided between the sliding groove 66 and the mounting bracket 67. The second springs 65 are sleeved on the outside of the connecting rods 64.

[0073] Then, under the action of external force, the drive connecting rod 64 moves upward, and drives the mounting bracket 67 and the striking head 68 to move. At this time, the second spring 65 is compressed. When the external force disappears, under the action of the restoring force of the second spring 65, the drive mounting bracket 67 and the striking head 68 are reset.

[0074] A vertical rod 59 is fixedly installed on one of the connecting rods 64. The top of the vertical rod 59 extends out of the top of the pusher plate 601, and a top block 58 is fixedly installed on the top of the vertical rod 59.

[0075] In the initial state, the bottom of the striking head 68 is higher than the bottom of the pusher plate 601, and the end of the top block 58 away from the fixed block 6 is close to the outer circumferential surface of the scraper 3's circumferential rotation trajectory. When the bottom of the slag pool 46 freezes, the height of the bottom surface increases (e.g., it increases to two-thirds of the height between the slag discharge port 42 and the bottom surface of the slag pool).

[0076] like Figures 11-12 At this time, the pusher plate 601 will move upward, and the top block 58 will move synchronously. Since the length of the top block 58 remains unchanged, when the top block 58 rises, the end of the top block 58 away from the fixed block 6 will extend into the circumferential rotation trajectory of the scraper 3. When the scraper 3 rotates, it will abut against one end of the top block 58, thereby driving the top block 58 to move upward. Then, the vertical rod 59 will drive the connecting rod 64 to move, and drive multiple sets of striking heads 68 to move upward. The second spring 65 is compressed. When the scraper 3 separates from the top block 58, the striking head 68 will reset under the action of the restoring force of the second spring 65. During the reset process of the striking head 68, due to the inertia, the striking head 68 will impact the ice to break it. This achieves the simultaneous scraping of scum in the slag storage tank 46 and the breaking of frozen scum.

[0077] It should be noted that the short side of the bottom of the top block 58 near the scraper 3 can be set to a rounded corner, so that it can move more smoothly when the scraper 3 contacts or separates from it. The long side of the bottom of the pusher plate 601 can also be set to a rounded corner, so that when the ice is broken and the pusher plate 601 is hanging on the ice, it can be moved to other unbroken ice blocks through the rounded corner, avoiding interference with the movement of the pusher plate 601.

[0078] Furthermore, the servo motor 55 can be started, driving the round rod 57 to rotate via the belt drive assembly, and causing the pusher plate 601 to move along... Figure 7 In the middle, the axis of the round rod 57 rotates at a certain angle toward the inside of the slag storage tank 46, and the upper end of the pusher plate 601 forms an inclined surface, so as to guide the scum into the interior of the slag storage tank 46, and then collect it when the pusher plate 601 is not in use. At the same time, some of the waste scum that crosses the upper end of the pusher plate 601 can be discharged through the slag outlet.

[0079] The above description is merely a preferred embodiment of this application and is not intended to limit this application. Various modifications and variations can be made to this application by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this application should be included within the protection scope of this application.

Claims

1. A multi-stage wastewater treatment device for oil fields, characterized in that: include: The pool body (1) is provided with a coagulation pool (22), a flocculation pool (24), an air flotation pool (27) and a clear water pool (4) in sequence inside the pool body (1). A slag storage pool (46) is provided at the end of the air flotation pool (27). The flotation tank (27) is provided with a sludge scraping section (29), which includes two sets of rotating shafts (35) with bearings installed on the top of the flotation tank (27). Two sets of second chain drive sections (36) are provided on the two sets of rotating shafts (35) for common transmission. Multiple sets of scraper blades (3) are installed on the two sets of second chain drive sections (36). A stepper motor (32) is provided on the pool body (1). A rotating rod (33) is fixedly installed on the output end of the stepper motor (32). A first chain drive unit (34) is provided on the rotating rod (33) and one of the rotating shafts (35). A toothed ring (77) is fixedly installed on one end of the rotating rod (33). The pool body (1) is also provided with an equipment box (51), and a reciprocating screw (53) is installed in the bearing inside the equipment box (51). The reciprocating screw (53) is provided with a meshing part (7), which is adapted to mesh with the gear ring (77). The equipment box (51) is equipped with two sets of guide rods (52), and a mounting plate (54) is slidably disposed on the guide rods (52). The mounting plate (54) is driven on the reciprocating screw (53). The mounting plate (54) is provided with a pusher plate (601), the bottom of which is adapted to contact the bottom of the slag storage tank (46) to scrape off the slag. A housing (56) is installed at one end of the mounting plate (54), and a servo motor (55) is installed at the top of the mounting plate (54). The output end of the servo motor (55) extends into the interior of the housing (56). A round rod (57) is rotatably installed on the housing (56). A belt drive assembly is provided for the joint transmission of the round rod (57) and the output end of the servo motor (55). The belt drive assembly is located inside the housing (56). A fixing block (6) is installed at one end of the round rod (57). A groove (61) is provided on the fixing block (6). The pusher plate (601) is slidably disposed inside the groove (61). A first spring (63) is provided between the groove (61) and the pusher plate (601). A support rod (62) is provided on the groove (61). One end of the support rod (62) extends into the interior of the pusher plate (601). Two sets of connecting rods (64) are slidably provided inside the pusher plate (601). A mounting bracket (67) is installed at the bottom of each of the two sets of connecting rods (64). At least two sets of striking heads (68) are provided at the bottom of the mounting bracket (67). The pusher plate (601) has a groove (66) inside, and the mounting bracket (67) is slidably disposed in the groove (66). Two sets of second springs (65) are provided between the groove (66) and the mounting bracket (67). The second springs (65) are sleeved on the outside of the connecting rod (64). A vertical rod (59) is installed on one of the connecting rods (64). The top of the vertical rod (59) extends out of the top of the pusher plate (601), and a top block (58) is installed on the top of the vertical rod (59). The pusher plate (601) moves upward and drives the top block (58) to move synchronously. Since the length of the top block (58) remains unchanged, when the top block (58) rises, one end of the top block (58) will extend into the circumferential rotation trajectory of the scraper (3). When the scraper (3) rotates, it will abut against one end of the top block (58), thereby driving the top block (58) to move upward. Then, the vertical rod (59) drives the connecting rod (64) to move, and drives multiple sets of striking heads (68) to move upward. The second spring (65) is compressed. When the scraper (3) separates from the top block (58), the striking head (68) resets under the action of the restoring force of the second spring (65). During the reset process of the striking head (68), due to the inertia, the striking head (68) will impact the ice block to break it.

2. The multi-stage wastewater treatment device for oil fields according to claim 1, characterized in that: The meshing part (7) includes a support block (71) installed inside the equipment box (51). A hydraulic cylinder (72) is installed on the top of the support block (71). A locking block (73) is installed at the output end of the hydraulic cylinder (72). A locking groove is provided on the locking block (73). An extension rod (78) is provided at one end of the reciprocating screw (53). A key block (74) is provided on the extension rod (78). A cylinder (75) is slidably arranged on the key block (74). The cylinder (75) has a cap, which is located inside the locking groove. A gear (76) is installed on the cylinder (75). The gear (76) is slidably arranged on the extension rod (78).

3. The multi-stage wastewater treatment device for oil fields according to claim 2, characterized in that: A pad (31) is installed on the pool body (1), and a stepper motor (32) is installed on the pad (31). A slag discharge port (42) is provided on the slag storage pool (46). One end of the rotating rod (33) extends into the interior of the equipment box (51). The gear ring (77) is located inside the equipment box (51). A water inlet pipe (21) is provided on the pool body (1). One end of the water inlet pipe (21) extends into the interior of the coagulation pool (22). An overflow port (23) is provided through the upper part of the coagulation pool (22) and the flocculation pool (24). A stirring part (25) is provided above both the coagulation pool (22) and the flocculation pool (24).

4. The multi-stage wastewater treatment device for oil fields according to claim 3, characterized in that: A dissolved air pump (44) is installed on the tank body (1). The output end of the dissolved air pump (44) is connected to a dissolved air tank (45). The dissolved air tank (45) is installed on the tank body (1). An air flotation pipe (261) is provided at the outlet of the dissolved air tank (45). At least two sets of aeration release parts (262) are provided inside the air flotation tank (27). The aeration release parts (262) are connected to the air flotation pipe (261) through pipes.

5. The multi-stage wastewater treatment device for oil fields according to claim 4, characterized in that: The flocculation tank (24) and the flotation tank (27) are connected by a drain outlet (241) at their lower parts. The flotation tank (27) is equipped with a partition (26) inside. The partition (26) is located on one side of the aeration release section (262). The two ends of the long side of the partition (26) are attached to the inner wall of the flotation tank (27) to form an aeration tank (263).

6. The multi-stage wastewater treatment device for oil fields according to claim 5, characterized in that: At least two sets of water collection pipes (28) are provided between the clear water tank (4) and the air flotation tank (27). At least two sets of water collection holes are provided on the outer surface of the water collection pipes (28). The clear water tank (4) is provided with a water outlet.

7. The multi-stage wastewater treatment device for oil fields according to claim 6, characterized in that: A return pipe (43) is provided on the outlet, one end of which is connected to the input end of the dissolved air pump (44). An outlet pipe (41) is provided inside the clear water tank (4), and the outlet pipe (41) is located at the top of the clear water tank (4).

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