Air flotation machine for treating drilling wastewater

Abstract

The invention belongs to the technical field of wastewater treatment, and particularly relates to a drilling wastewater treatment air flotation machine which comprises an air flotation machine body, a mud scraping plate is slidably arranged in a separation chamber of the air flotation machine body, the upper portion of the mud scraping plate is movably connected with a linkage plate, a mud discharge notch is formed in the bottom of the separation chamber of the air flotation machine body, and a mud discharge assembly is arranged at the mud discharge notch. One side of the air flotation machine body is provided with a driving assembly for driving the sludge scraping plate to reciprocate, when the sludge scraping plate moves to the corresponding position of the sludge discharging notch, the sludge scraping plate, the linkage plate and the side wall of the separation chamber jointly form a closed sludge gathering cavity, and at the moment, the sludge discharging assembly is synchronously started to execute quantitative sludge discharging; through cooperation of the structures, sludge at the bottom of the separation chamber is regularly removed, and meanwhile, interference to a water body of the separation chamber can be avoided during removal.

Description

Technical Field

[0001] The present invention belongs to the technical field of wastewater treatment, specifically an air flotation machine for treating drilling wastewater. Background Art

[0002] An air flotation machine is a water treatment device that generates a large number of fine bubbles in water through a dissolved air system, causing air to adhere to suspended solid particles in the form of highly dispersed tiny bubbles, creating a state with a density less than that of water, and using the buoyancy principle to make it float on the water surface, thereby achieving solid-liquid separation.

[0003] However, there are still the following deficiencies: for example, due to the characteristics of drilling wastewater, the sludge that sinks after air flotation separation contains highly viscous substances (such as bentonite, oil) and residual flocculants. If not removed in time, it is extremely easy to adhere to the bottom of the equipment, ultimately leading to siltation and even hardening, increasing the difficulty of removal. At the same time, heavy metals (such as chromium, arsenic), oil, and chemical additives are enriched in the sludge. Long-term retention may cause pollutants to be re-dissolved or disturbed and released again, affecting the stability of the effluent water quality. Therefore, it is necessary to quickly discharge the precipitated sludge from the air flotation machine. However, when the existing dissolved air type air flotation machine discharges the settled sludge, it is easy to break the stability of the fluid in the separation chamber of the air flotation machine, thereby affecting the separation of impurities in the wastewater. In order to avoid this situation, it is only possible to suspend the separation and treatment work of the wastewater, thereby reducing the treatment efficiency of the air flotation machine for drilling wastewater.

[0004] Therefore, the present invention provides an air flotation machine for treating drilling wastewater. Summary of the Invention

[0005] In order to make up for the deficiencies of the prior art and solve at least one of the technical problems proposed in the background art.

[0006] The technical solution adopted by the present invention to solve its technical problems is as follows: The air flotation machine for treating drilling wastewater described in the present invention includes an air flotation machine body. A sludge scraping plate is slidably arranged in the separation chamber of the air flotation machine body, and a linkage plate is rotatably connected to the upper part of the sludge scraping plate. A sludge discharge groove is opened at the bottom of the separation chamber of the air flotation machine body, and a sludge discharge assembly is arranged at the sludge discharge groove. A driving assembly for driving the sludge scraping plate to reciprocate is arranged on one side of the air flotation machine body. When the sludge scraping plate moves to the position corresponding to the sludge discharge groove, the sludge scraping plate, the linkage plate, and the side wall of the separation chamber jointly form a closed sludge aggregation cavity, and at this time, the sludge discharge assembly is synchronously opened to perform quantitative sludge discharge.

[0007] Further, the sludge discharging assembly includes a conveying roller rotatably installed at the sludge discharging slot opening, and a slag discharging cover fixedly connected to the air flotation machine body is arranged at its lower part. Symmetric spiral sludge suction grooves are arranged on the surface of the conveying roller, and piston holes are included at the bottom of each groove. A slidable piston rod is arranged inside, and a return spring and a threaded limit sleeve are sequentially assembled at the outer end of the piston rod and connected to a piston plate matching the sludge suction groove. A double air guiding channel is arranged at the shaft end of the roller body to connect the piston hole, and an air inlet / air outlet hole group with a phase difference of ° is arranged on the peripheral air guiding disc. The air path is switched by the rotation of the roller body, and the air inlet hole of the air guiding disc is connected to the air supply pipeline of the air flotation machine body through a rigid air pipe. The driving motor is fixed on the side of the air flotation machine body to drive the conveying roller to operate.

[0008] Further, the side of the piston plate away from the piston rod is arranged in an arc shape identical to the outer contour of the conveying roller.

[0009] Further, mud dividing blades are arranged along the axial direction in the mud discharging port of the slag discharging cover.

[0010] Further, the side wall of the sludge suction groove is coated with a polytetrafluoroethylene layer facilitating the detachment of sludge.

[0011] Further, a limit boss is arranged at the left side of the top end of the mud scraping plate, and an inclined angle constraint surface is arranged at the right side of the lower end of the linkage plate. The limit boss and the rotation axis of the linkage plate form an angle constraint structure, and the constraint angle range is 0° - 70°.

[0012] Further, a storage groove for storing the mud scraping plate and the linkage plate is arranged on the side wall of the separation chamber of the air flotation machine body.

[0013] Further, a maintenance slot opening is arranged at the bottom of the separation chamber on the side opposite to the sludge discharging slot opening, and the width of the maintenance slot opening is smaller than the width of the mud scraping plate. A sealing cover plate is arranged at the maintenance slot opening, and a flexible scraping blade for cleaning the lower end of the mud scraping plate is arranged at the upper end of the sealing cover plate.

[0014] Further, a through slot is arranged on the linkage plate, and a turning plate for guiding the flow is rotatably arranged at one end of the through slot close to the telescopic rod.

[0015] The beneficial effects of the present invention are as follows:

[0016] 1. The air flotation machine for treating drilling wastewater of the present invention constitutes a component for scraping the sludge at the bottom of the separation chamber of the air flotation machine through the mud scraping plate, the linkage plate and the telescopic cylinder. At the same time, an activity connection mode is adopted between the mud scraping plate and the linkage plate, so that the linkage plate is in an inclined state when the mud scraping plate scrapes the sludge, thus being able to intercept smaller impurity particles lifted by the disturbance and causing less interference to the stability of the fluid.

[0017] 2. The air flotation machine for treating drilling wastewater according to the present invention forms a closed sludge accumulation cavity jointly by a sludge scraping plate, a linkage plate and the side wall of the separation chamber, isolating the interference generated when discharging the accumulated sludge, so that the flow of the fluid in the separation chamber will not change, thereby achieving that the normal wastewater treatment work of the air flotation machine does not need to be stopped when cleaning the sludge. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] The present invention will be further described below with reference to the accompanying drawings.

[0019] Figure 1 is a perspective view of the present invention;

[0020] Figure 2 is a perspective view of the present invention;

[0021] Figure 3 is a front sectional view of the present invention;

[0022] Figure 4 is a front sectional view in the main view direction when the sludge scraping plate moves to the sludge discharge slot opening in the present invention;

[0023] Figure 5 is an axial sectional view of the sludge discharge assembly in the present invention;

[0024] Figure 6 is Figure 5 a partial enlarged view of part A in

[0025] Figure 7 is a perspective view of the sludge scraping plate in the present invention;

[0026] Figure 8 is a perspective view of the linkage plate part in the present invention;

[0027] Figure 9 is Figure 3 a partial enlarged view of part B in

[0028] In the figure: 1. Air flotation machine body; 2. Sludge scraping plate; 3. Linkage plate; 4. Sludge discharge assembly; 5. Telescopic rod; 6. Polytetrafluoroethylene layer; 7. Sealing cover plate; 8. Flap; 9. Mud separating blade; 10. Flexible scraping blade; 40. Sludge discharge cover; 41. Conveyor roller; 42. Piston plate; 43. Piston rod; 44. Driving motor; 45. Return spring; 46. Air guide disc; 47. Limit sleeve; 100. Sludge discharge slot opening; 101. Sludge accumulation cavity; 102. Maintenance slot opening; 410. Mud suction groove; 411. Piston hole; 412. Air guide channel. DETAILED DESCRIPTION OF THE INVENTION

[0029] In order to make the technical means, creative features, achieved purposes and effects of the present invention easy to understand, the present invention will be further described below in conjunction with specific embodiments.

[0030] Embodiment 1: Figure 1-8 As shown, a scraper plate 2 for scraping off the sludge layer is slidably arranged at the bottom of the separation chamber of the air flotation machine body 1 described in the embodiment of the present invention, and a telescopic rod 5 is arranged on one side of the air flotation machine body 1, and the output end of the telescopic rod 5 is movably connected to the linkage plate 3, and a rotating connection method is adopted between the linkage plate 3 and the scraper plate 2, so that the linkage plate 3 first rotates with the upper end of the scraper plate 2 as the axis under the push of the telescopic rod 5, and when the linkage plate 3 and the scraper plate 2 are 110° apart, the linkage plate 3 cannot continue to rotate, and finally the linkage plate 3 pulls the scraper plate 2 to shovel the sludge at the bottom of the separation chamber, so that the sludge is gathered toward the mud discharge slot 100 under the push of the scraper plate 2, and finally the upper end of the linkage plate 3 contacts the side wall of the separation chamber, so that the scraper plate 2, the linkage plate 3 and the side wall of the separation chamber together constitute a closed sludge gathering chamber 101.

[0031] like Figure 4 , Figure 5 and Figure 6 As shown, a conveying roller 41 is rotatably arranged in the mud discharge groove 100, and a symmetrical spiral mud suction groove 410 is arranged on its surface. A piston hole 411 is evenly opened at the bottom of the mud suction groove 410, and a slidable piston rod 43 is built in it. The outer end of the piston rod 43 is equipped with a return spring 45 and a threaded limit sleeve 47 in sequence, and is connected to the piston plate 42, and the outer side of the piston plate 42 is set to have the same curved surface as the conveying roller 41, and a double air guide channel 412 is provided at the axial end of the roller body to connect the piston hole, and the outer air guide plate 46 is configured with an inlet / exhaust hole group with a phase difference of 180°, and the air inlet hole of the air guide plate 46 is connected to the air supply pipeline of the air flotation machine body 1 through a rigid air pipe, and the rigid air pipe connection is used to constrain and fix the air guide plate 45.

[0032] When the scraper blade 2, the linkage plate 3 and the side wall of the separation chamber together form a closed sludge collection chamber 101, the driving motor 44 is controlled by the electrical control box to drive the conveying roller 41 to rotate, so that the roller body rotates to realize the cyclic switching between the two air guide channels 412 and the inlet / exhaust holes of the air guide plate 46, and then the sludge suction groove 410 is cyclically switched between positive and negative pressure states, that is, the sludge suction groove 410 quickly performs negative pressure absorption on the sludge collection chamber 101 at the negative pressure position, and when the sludge suction groove 410 rotates to a position opposite to the sludge discharge port of the slag discharge hood 40, the air pushes the piston rod 43 and the piston plate 42 to discharge the absorbed sludge.

[0033] like Figure 4 As shown, in order to allow the sludge to be discharged smoothly, a mud dividing blade 9 is axially arranged in the mud discharge port of the slag discharge cover 40, so that the sludge pushed out by the piston plate 42 is cut by the mud dividing blade 9, which facilitates the sludge to be discharged from the mud discharge port of the slag discharge cover 40, and the side wall of the mud suction groove 410 is coated with a polytetrafluoroethylene layer 6 to facilitate the sludge to be separated, thereby reducing the adhesion of the sludge to the side wall of the mud suction groove 410.

[0034] like Figure 9 As shown, in the specific implementation process, with the repetitive reciprocating sliding of the scraper plate 2, some fine impurity particles are likely to enter the gap between the scraper plate 2 and the bottom of the separation chamber. In order to reduce the further adverse effects caused by it, an inspection slot 102 is opened at the bottom of the separation chamber on the side opposite to the mud discharge slot 100. The width of the inspection slot 102 is designed to be smaller than the width of the scraper plate 2 to prevent the scraper plate 2 from being stuck in the inspection slot. A sealing cover plate 7 is provided at the inspection slot 102, and a flexible scraper blade 10 for cleaning the lower end of the scraper plate 2 is fixed to the upper end of the sealing cover plate 7. At the same time, the reset sliding of the scraper plate 2 can remove the newly generated sediment and collect the small amount of accumulated sediment through the inspection slot 102.

[0035] Embodiment 2: When the scraping action is too fast during the implementation of the present invention, it is easy to cause the fluid to collide with the scraper plate 2 and the linkage plate 3 to cause a large disturbance, so that the scraped sludge rolls over the linkage plate 3 under the action of the disturbance, causing an adverse effect on the water quality of the outlet water.

[0036] like Figure 8 and Figure 9 As shown, compared with Example 1, a through groove 30 is opened on the linkage plate 3, and a flap 8 for diverting is rotatably arranged near one end of the telescopic rod 5, so that when the relative flow velocity of the fluid is too fast, the flap 8 automatically flips open to reduce the resistance to the fluid, thereby reducing the disturbance caused by mud scraping and causing greater interference to the flow of the fluid in the separation chamber.

[0037] Working principle: When removing sludge, the electrical control box controls the output end of the telescopic rod 5 to push the linkage plate 3, so that the linkage plate 3 first rotates with the upper end of the scraper plate 2 as the axis. When the angle between the linkage plate 3 and the scraper plate 2 reaches 110°, the linkage plate 3 cannot continue to rotate, so that the linkage plate 3 pulls the scraper plate 2 to shovel the sludge at the bottom of the separation chamber, so that the sludge is pushed by the scraper plate 2 to gather toward the direction of the mud discharge groove 100, and at the same time, the linkage plate 3 in an inclined state intercepts smaller impurity particles disturbed by the fluid hitting the scraper plate 2.

[0038] When the telescopic rod 5 reaches the maximum extended stroke, the upper end of the linkage plate 3 fits against the side wall of the separation chamber. The mud scraping plate 2, the linkage plate 3, and the side wall of the separation chamber together form a closed sludge accumulation cavity 101 state. The electric control box controls the driving motor 44 to drive the conveying roller 41 to rotate. When the piston plate 42 in the lower mud suction groove 410 fits against the inner wall of the slag discharge cover 40 under the push of air, when the mud suction groove 410 moves to its corresponding upper position, the air is discharged through the exhaust holes of the air guide disc 46 under the push of the elastic force of the return spring 45, so that the mud suction groove 410 is in a negative pressure state, and the sludge accumulated in the sludge accumulation cavity 101 is sucked into the mud suction groove 410. When the sucked sludge rotates synchronously with the conveying roller 41 to the mud discharge port of the slag discharge cover 40, the air will enter the piston hole 411 through the air guide channel 412 again, causing the piston rod 43 to squeeze the return spring 45 and push the piston plate 42 at the same time, and then the sludge is pushed out from the mud discharge port of the slag discharge cover 40.

[0039] The above front, back, left, right, up, and down are all based on the Figure 1 description in the accompanying drawings of the specification. Taking the observer's perspective as the standard, the side of the device facing the observer is defined as the front, the left side of the observer is defined as the left, and so on.

[0040] In the description of the present invention, it should be understood that the orientation or positional relationships indicated by the terms "center", "longitudinal", "transverse", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. are based on the orientation or positional relationships shown in the drawings. It is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as limiting the protection scope of the present invention.

[0041] The above shows and describes the basic principles, main features, and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited by the above embodiments. The above embodiments and the descriptions in the specification only illustrate the principles of the present invention. Without departing from the spirit and scope of the present invention, the present invention will have various changes and improvements, and these changes and improvements all fall within the scope of the present invention claimed. The scope of protection claimed by the present invention is defined by the appended claims and their equivalents.

Claims

1. Air flotation machine for treating drilling wastewater, comprising an air flotation machine body (1), characterized in that: A sludge scraping plate (2) is slidably arranged in the separation chamber of the air flotation machine body (1), and a linkage plate (3) is rotatably connected to the upper part of the sludge scraping plate (2). A sludge discharge groove opening (100) is formed at the bottom of the separation chamber of the air flotation machine body (1), and a sludge discharge assembly (4) is arranged at the sludge discharge groove opening (100). One side of the air flotation machine body (1) is provided with a telescopic rod (5) for driving the sludge scraping plate (2) to reciprocate. When the sludge scraping plate (2) moves to the position corresponding to the sludge discharge groove opening (100), the sludge scraping plate (2), the linkage plate (3) and the side wall of the separation chamber jointly form a closed sludge accumulation cavity (101). At this time, the sludge discharge assembly (4) is synchronously opened to perform quantitative sludge discharge.

2. The air flotation machine for treating drilling wastewater according to claim 1, wherein: The sludge discharge assembly (4) includes a conveying roller (41) rotatably installed at the sludge discharge groove opening (100), and a slag discharge cover (40) fixedly connected to the air flotation machine body (1) is arranged at its lower part. Symmetric spiral sludge suction grooves (410) are arranged on the surface of the conveying roller (41), and piston holes (411) are included at the bottom of each groove. A slidable piston rod (43) is arranged inside. A return spring (45) and a threaded limit sleeve (47) are sequentially assembled at the outer end of the piston rod (43), and a piston plate (42) matching the sludge suction groove is connected. A double air guide channel (412) is arranged at the shaft end of the roller body to connect the piston hole. The outer peripheral air guide disc (46) is configured with an air inlet / air outlet hole group with a phase difference of 180°. The air path is switched by the rotation of the roller body. The air inlet hole of the air guide disc (46) is connected to the air supply pipeline of the air flotation machine body (1) through a rigid air pipe. A driving motor (44) is fixed to the side of the air flotation machine body (1) to drive the conveying roller (41) to rotate.

3. The air flotation machine for treating drilling wastewater according to claim 2, wherein: One side of the piston plate (42) away from the piston rod (43) is arranged in an arc shape identical to the outer contour of the conveying roller (41).

4. The air flotation machine for treating drilling wastewater according to claim 3, wherein: A sludge dividing blade (9) is arranged along the axial direction in the sludge discharge port of the slag discharge cover (40).

5. The air flotation machine for treating drilling wastewater according to claim 4, characterized in that: The side wall of the sludge suction groove (410) is coated with a polytetrafluoroethylene layer (6) facilitating the separation of sludge.

6. The air flotation machine for treating drilling wastewater according to claim 5, wherein: A limit boss is arranged on the left side of the top end of the sludge scraping plate (2), and an inclined angle constraint surface is arranged on the right side of the lower end of the linkage plate (3). The limit boss and the rotation axis of the linkage plate (3) form an angle constraint structure, and the range of its constraint angle is 0° - 70°.

7. The air flotation machine for treating drilling wastewater according to claim 6, characterized in that: A storage groove for storing the sludge scraping plate (2) and the linkage plate (3) is arranged on the side wall of the separation chamber of the air flotation machine body (1).

8. The air flotation machine for treating drilling wastewater according to claim 7, wherein: An inspection groove opening (102) is formed at the bottom of the separation chamber on the side opposite to the sludge discharge groove opening (100), and the width of the inspection groove opening (102) is smaller than the width of the sludge scraping plate (2). A sealing cover plate (7) is arranged at the inspection groove opening (102), and a flexible scraping blade (10) for cleaning the lower end of the sludge scraping plate (2) is arranged at the upper end of the sealing cover plate (7).

9. The air flotation machine for treating drilling wastewater according to claim 8, characterized in that: A through groove (30) is formed on the linkage plate (3), and a flap (8) for guiding the flow is rotatably arranged at one end of the through groove (30) close to the telescopic rod (5).

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