Coal mine wastewater pretreatment device and method

Abstract

This invention discloses a pretreatment device and method for coal mine wastewater, relating to the field of wastewater treatment technology. It includes a crossbeam, a front oil removal assembly, and a rear oil removal assembly. The front oil removal assembly includes a telescopic rod, an oil scraper, and a pusher plate. The rear oil removal assembly includes multiple oil suction units, each including an oil suction float roller and an oil guide groove. Each oil suction float roller has turntables at both ends for squeezing oil, and the oil guide groove guides the squeezed oil to an oil box. The invention also includes the following steps: S1: Adjusting the position of the oil scraper; S2: Scraping oil; S3: Suctioning oil with the oil suction float roller; S4: Switching the oil suction float roller; S5: Squeezing out and collecting grease; S6: Concentrating the grease; S7: Cleaning the oil scraper; S8: Self-cleaning of the pusher plate. This invention allows for simultaneous oil scraping and suction. The oil scraper adjusts its position and angle according to the oil layer, cooperating with the pusher plate to scrape oil and prevent spillage. The pusher plate cleans the oil scraper and performs self-cleaning. The oil suction unit can switch to suction the oil film with the oil suction float roller, and after saturation, squeezes and collects the oil, effectively improving the efficiency and quality of oil removal from coal mine wastewater.

Description

Technical Field

[0001] This invention relates to the field of wastewater treatment technology, and in particular to a coal mine wastewater pretreatment device and method. Background Technology

[0002] Coal mine wastewater contains complex pollutants and high levels of recalcitrant substances, including oils, phenols, cyanides, and sulfides. Oil pollutants, due to their unique physicochemical properties, pose a significant challenge in coal mine wastewater treatment. Inadequate treatment of oil pollutants can not only affect the operational efficiency of subsequent treatment units but also lead to a series of problems such as equipment blockage and reagent failure, greatly increasing overall treatment costs and environmental risks. Currently, static sedimentation is a common oil removal method in the pretreatment stage of coal mine wastewater, often combined with subsequent treatment processes such as flotation, filtration, and adsorption to achieve better oil removal results. This method is based on the principle of density differences between oil, water, and solid phases. Gravity causes oil in the wastewater to float to the surface, forming an oil layer, while suspended solids and impurities sink to the bottom, thus completing the three-phase separation. An oil skimmer is installed on the water surface to periodically scrape the floating oil into an oil collection point, effectively removing floating oil (particle size >150μm) and dispersed oil (particle size 20-150μm).

[0003] However, traditional oil scraping devices have revealed many shortcomings in practical applications: First, the contact angle between the scraper and the water surface of traditional oil scraping devices is fixed, making it difficult to adapt to fluctuations in liquid level, and it is easy to scrape dry or scrape into the deep layers of water, resulting in low oil scraping efficiency; Second, it is easy to leave oil film and cannot effectively scrape off thin oil layers; Third, it lacks a targeted design for the adhesion characteristics of grease, and when dealing with high-viscosity grease, the scraper is prone to grease accumulation and blockage. Summary of the Invention

[0004] The purpose of this invention is to solve the problems mentioned in the background art by providing a coal mine wastewater pretreatment device and method.

[0005] To achieve the above objectives, the present invention adopts the following technical solution:

[0006] A coal mine wastewater pretreatment device, comprising:

[0007] A crossbeam, which is mounted on the conveyor via a lifting column;

[0008] The front degreasing assembly includes a telescopic rod, a scraper, and a pusher. The top of the telescopic rod is rotatably connected to the crossbeam, and the bottom of the telescopic rod is rotatably connected to the scraper. The pusher is mounted on the telescopic rod, and the bottom of the pusher contacts the surface of the scraper in an alternating manner.

[0009] The post-oil removal assembly includes multiple oil suction units. Multiple support plates are evenly distributed below the cross frame. An oil box is fixedly installed below each support plate. An oil suction unit is rotatably installed between every two oil boxes. Each oil suction unit includes multiple oil suction floats and an oil guide groove. The oil suction unit switches the position of the oil suction floats by rotating. Each oil suction float has a turntable at both ends for squeezing out the grease inside the oil suction float. The oil guide groove is used to guide the squeezed oil to the oil box.

[0010] As a further aspect of the present invention: the oil suction unit includes two oil suction floats, which are arranged in parallel, one above the other, and both ends of each oil suction float are fixedly connected to the turntable.

[0011] All the turntables are driven to rotate by a motor, and the turntables located at both ends of the oil suction roller rotate in opposite directions. All the turntables are rotatably mounted on a switching plate, and the switching plate is rotatably mounted on the oil box.

[0012] As a further aspect of the present invention: the rotation center of the switching plate is the center line of the distance between the two oil-absorbing floats, and the position switching of the two oil-absorbing floats is achieved by rotating the switching plate;

[0013] When the switching plate is in a vertical position, the lower oil suction float is in the oil suction position, and the upper oil suction float is in the oil squeezing position.

[0014] As a further aspect of the present invention: the oil suction unit includes two oil guide grooves, and the two oil guide grooves are located between two oil suction floating rollers;

[0015] The oil guide groove is a V-shaped groove, and the two oil guide grooves are arranged in a mirror symmetrical layout. One oil guide groove opens upward and faces the oil suction float roller located above; the other oil guide groove opens downward and faces the oil suction float roller located below.

[0016] The two ends of the two oil guide grooves are respectively fixed to two switching plates. The switching plates have oil holes at the corresponding positions of the oil guide grooves. The oil holes are connected to the oil box through oil pipes.

[0017] The two ends of the oil guide groove are aligned with the oil hole, and the bottom edge of the inner side of the oil guide groove is inclined towards the oil hole with a high middle and low sides.

[0018] An oil collection tank is fixedly installed on the top of the cross frame. An oil pump is installed inside the oil collection tank, and the oil pump is connected to the oil box through a hose.

[0019] As a further aspect of the present invention: a ring gear is fixedly installed on the side of the switching plate facing the oil box. The ring gear meshes with the drive gear. The drive gear is powered by a motor to drive the ring gear to rotate, thereby driving the switching plate to rotate.

[0020] The oil pipe passes through the center of the ring gear, and its two ends are sealed to the oil hole and the oil box, respectively.

[0021] The inner walls of the oil pipes and oil holes are all inclined, and the inclination direction is towards the oil box.

[0022] As a further aspect of the present invention: the oil-absorbing float roller is made of a flexible oil-absorbing material, and the outer surface of the oil-absorbing float roller is provided with radial telescopic fins.

[0023] As a further aspect of the present invention: the conveyor is installed in the pretreatment tank, and an oil layer detector is provided in the conveyor or the pretreatment tank.

[0024] As a further embodiment of the present invention: the telescopic rod includes a fixed part and a telescopic part, wherein the fixed part is on top, the fixed part is rotatably connected to the cross frame by means of an electric rotating joint, and the telescopic part is also rotatably connected to the oil scraper by means of an electric rotating joint.

[0025] As a further embodiment of the present invention: the fixed part of the telescopic rod has a movable groove on the side facing the push plate, a spring is fixedly installed in the movable groove, a movable block is fixedly connected below the spring, and the movable block is fixedly connected to the push plate;

[0026] The movable block is a magnetic block, and an electromagnet is provided above the movable slot.

[0027] A method for using a coal mine wastewater pretreatment device, employing the fully automatic vessel cleaning device described above, includes the following steps:

[0028] S1: Based on the oil layer thickness data fed back by the oil layer detector, control the extension of the telescopic part of the telescopic rod to extend, and at the same time control the rotation of the electric rotary joint to adjust the height and tilt angle of the oil scraper so that the oil scraper can accurately fit the oil layer surface.

[0029] S2: Start the conveyor to drive the front oil removal component to run. The oil scraper removes the floating oil on the water surface for the first time. The V-shaped structure formed by the pusher and the oil scraper pushes the oil layer to move towards the grease collection point in the pretreatment tank.

[0030] S3: While the scraper scrapes the oil, the oil suction float roller located below the rear oil removal component begins to remove the oil film remaining after scraping. During the oil suction process, the radial telescopic fins on the outer surface of the oil suction float roller extend to increase the contact area with the oil film and improve the suction efficiency.

[0031] S4: When the lower oil suction float reaches saturation, the drive gear drives the ring gear to rotate, which in turn causes the switching plate to rotate, switching the upper oil suction float that is in the oil squeezing position to the oil suction position to continue the oil suction operation, while the saturated oil suction float is switched to the oil squeezing position.

[0032] S5: The saturated oil-absorbing floating roller in the oil-squeezing position has its two end discs rotating in opposite directions under the drive of the motor, squeezing out the grease in the oil-absorbing floating roller. The squeezed-out grease flows through the oil guide groove to the oil hole and then flows into the oil box along the oil pipe.

[0033] S6: The grease in the oil box is transported through the hose to the oil collection tank at the top of the cross frame by the oil pump to complete the collection.

[0034] S7: When the scraper and suction roller reach the grease collection point of the pretreatment tank and complete one "scraping-suction" stroke, control the push plate to remove the grease accumulated on the surface of the scraper.

[0035] S8: Controls the electromagnet to be energized, causing the movable block to vibrate and drive the push plate to shake off the oil layer attached to itself, preparing it for the next use.

[0036] Compared with existing technologies, the advantages of this invention are:

[0037] 1. After the front oil removal component completes the initial scraping of floating oil on the water surface, the oil suction unit of the rear oil removal component can immediately remove the residual oil film, forming a dual treatment mechanism of "scraping oil-suctioning oil". This effectively solves the problem of oil film residue in traditional devices. The oil suction unit adopts a switchable oil suction float roller design. When a certain oil suction float roller reaches saturation, it can be quickly switched to another oil suction float roller for continuous operation by rotating the switching plate. At the same time, under the reverse rotation and squeezing of the turntable, the saturated oil suction float roller causes the grease to flow into the oil box through the oil guide groove and is finally collected in the oil collection tank, realizing the continuity of oil suction operation and avoiding downtime for cleaning due to saturation of the oil suction material.

[0038] 2: The scraper blade of the front degreasing component can adjust its height and tilt angle according to the thickness of the oil layer, so as to accurately fit the surface of oil layers of different thicknesses. At the same time, the V-shaped structure formed by the push plate and the scraper blade creates a closed flow channel when pushing the oil layer, which effectively prevents the oil layer from overflowing and improves the cleanliness of the scraping. In addition, the push plate can remove the grease accumulated on the surface of the scraper blade, and the push plate itself can shake off the oil layer attached to itself by electromagnet vibration, reducing the frequency of manual cleaning. Attached Figure Description

[0039] Figure 1 This is a schematic diagram of the overall structure of the present invention;

[0040] Figure 2 This is a front view structural diagram of the present invention;

[0041] Figure 3 for Figure 2 A magnified schematic diagram of the partial structure at point A in the middle;

[0042] Figure 4 This is a schematic diagram of the structure of the present invention installed in the pretreatment tank;

[0043] Figure 5 This is a schematic diagram of the structure of the cross frame, front degreasing assembly, and rear degreasing assembly of the present invention;

[0044] Figure 6 This is a schematic diagram of the structure of the front degreasing component of the present invention;

[0045] Figure 7 This is a front view of the front degreasing assembly of the present invention.

[0046] Figure 8 for Figure 7 A magnified schematic diagram of the local structure at point B;

[0047] Figure 9 This is a schematic diagram of the structure of the post-oil removal component of the present invention;

[0048] Figure 10 This is a front view of the oil removal assembly of the present invention.

[0049] Figure 11 This is a schematic diagram of the oil absorption unit of the present invention;

[0050] Figure 12 for Figure 11 A magnified schematic diagram of the structure at point C in the middle;

[0051] Figure 13 This is a front view of the oil-absorbing unit of the present invention.

[0052] Figure 14 This is a schematic diagram showing the disassembled structure of the oil-absorbing unit of the present invention;

[0053] Figure 15 This is a schematic diagram of the installation structure of the oil suction float and switching plate of the present invention;

[0054] Figure 16 This is a schematic diagram of the internal structure of the switching board of the present invention;

[0055] Figure 17 for Figure 16 A magnified schematic diagram of the local structure at point D;

[0056] Figure 18 This is a schematic diagram of the oil guide groove of the present invention;

[0057] Figure 19 This is a schematic diagram of the structure of the oil suction floating roller of the present invention;

[0058] Figure 20 This is a schematic diagram of another structure of the oil box of the present invention;

[0059] Figure 21 This is a schematic diagram showing the orientation of the inner bottom surface of the oil guide groove in this invention;

[0060] Figure 22This is a schematic diagram showing the working state of the scraper and pusher of the present invention;

[0061] Figure 23 This is a schematic diagram of the oil-absorbing floating roller and radial telescopic fins of the present invention.

[0062] In the diagram: 1. Horizontal frame; 11. Lifting column; 111. Conveyor; 112. Pretreatment tank; 12. Support plate; 13. Oil box; 131. Hose; 14. Oil collection tank; 2. Front oil removal assembly; 21. Telescopic rod; 211. Fixed part; 212. Telescopic part; 213. Electric rotating joint; 2111. Movable groove; 2112. Spring; 2113. Movable block; 2114. Electromagnet; 22. Scraper; 23. Push plate; 3. Rear oil removal assembly; 31. Oil suction unit; 311. Oil suction floating roller; 3111. Radial telescopic fins; 3112. Inflatable bladder; 312. Oil guide groove; 313. Turntable; 314. Switching plate; 3141. Oil hole; 3142. Oil pipe; 315. Ring gear; 316. Drive gear. Detailed Implementation

[0063] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0064] Reference Figure 1-23 A coal mine wastewater pretreatment device mainly consists of a cross frame 1, a front oil removal component 2, and a rear oil removal component 3. The cross frame 1 is installed on a conveyor 111 via a lifting column 11. The conveyor 111 is installed in a pretreatment tank 112 to remove oil pollutants from the coal mine wastewater. The lifting column 11 uses a hydraulic cylinder or a lifting screw. The overall height of the cross frame 1 can be adjusted according to actual needs to adapt to coal mine wastewater treatment scenarios with different liquid levels.

[0065] An oil layer detector is installed in the conveyor 111 or the pretreatment tank 112 to detect the thickness of the oil layer on the surface of the coal mine wastewater in the pretreatment tank 112. If the oil layer detector is installed on the conveyor 111, an optical reflective oil film sensor can be used. If the oil layer detector is installed in the pretreatment tank 112, a capacitive oil layer thickness sensor can be used.

[0066] Reference Figure 1-8The front oil removal assembly 2 includes a telescopic rod 21, an oil scraper 22, and a pusher 23. The top of the telescopic rod 21 is rotatably connected to the crossbeam 1 via an electric rotary joint 213, and the bottom is also rotatably connected to the oil scraper 22 via an electric rotary joint 213. This allows the oil scraper 22 to flexibly adjust its angle in two dimensions. Based on the oil layer thickness data fed back by the oil layer detector, the telescopic part 212 of the telescopic rod 21 (the telescopic rod 21 is an electric telescopic rod) is controlled to extend or retract, while the electric rotary joint 213 is controlled to rotate, thereby precisely adjusting the height and tilt angle of the oil scraper 22 to ensure it fits tightly against the oil layer surface. For example, when the oil layer is thick, the tilt angle of the oil scraper 22 can be appropriately increased to improve the oil scraping efficiency; when the oil layer is thin, the tilt angle is reduced to avoid scraping into the deep water layer.

[0067] The push plate 23 is installed on the telescopic rod 21, and the bottom of the push plate 23 is in staggered contact with the surface of the oil scraper 22 (specifically, the bottom of the push plate 23 is against the surface of the oil scraper 22). In actual operation, when the conveyor 111 starts and drives the front oil removal component 2 to run, the oil scraper 22 performs the initial scraping of the floating oil on the water surface. During the process of the oil scraper 22 pushing the oil layer to the grease collection point of the pretreatment tank 112, the V-shaped structure formed by the push plate 23 and the oil scraper 22 forms a closed flow channel during the pushing process, which effectively prevents the oil layer from overflowing and improves the cleanliness of the scraped oil.

[0068] The fixed part 211 of the telescopic rod 21 has a movable groove 2111 on the side facing the push plate 23. A spring 2112 is fixedly installed in the movable groove 2111. A movable block 2113 is fixedly connected below the spring 2112. The movable block 2113 is fixedly connected to the push plate 23 and is a magnetic block. An electromagnet 2114 is provided above the movable block 2113 in the movable groove 2111. When the electromagnet 2114 is energized, the magnetic field generated by the electromagnet 2114 interacts with the movable block 2113, which can make the movable block 2113 vibrate up and down.

[0069] During the oil scraping process of the scraper blade 22, grease inevitably accumulates on its surface. The push plate 23 can remove this accumulated grease. Specifically, the telescopic part 212 of the telescopic rod 21 is extended or retracted, and the electric rotary joint 213 of the telescopic part 212 is rotated, allowing the surface of the scraper blade 22 to slide up and down against the bottom of the push plate 23 (a pressure sensor is installed on the surface of the scraper blade 22, and the electric rotary joint 213 adjusts the angle of the scraper blade 22 according to the pressure sensor value, so that the surface of the scraper blade 22 always remains in contact with the push plate 23), thereby scraping off the grease (such as oil scraper blade 22 surface grease) from the surface of the scraper blade 22. Figure 7 , Figure 22 (As shown).

[0070] After completing one "scraping-absorbing" cycle, the push plate 23 is used to clean the surface of the scraper plate 22. Since the grease on the surface of the scraper plate 22 is scraped off by the bottom of the push plate 23, some grease will inevitably stick to the bottom of the push plate 23. By controlling the electromagnet 2114 to be energized, the magnetic field generated by the electromagnet 2114 repulses or attracts the movable block 2113, causing the movable block 2113 to vibrate, which in turn drives the push plate 23 to vibrate. During the vibration of the push plate 23, the bottom of the push plate 23 will also collide with the scraper plate 22 (e.g., ...). Figure 22 As shown), the pusher plate 23 uses vibration and collision effects to shake off the oil layer attached to its bottom, thus completing the self-cleaning of the pusher plate 23.

[0071] Reference Figure 9-19 The oil removal assembly 3 includes multiple oil suction units 31. Multiple support plates 12 are evenly arranged below the cross frame 1. Each support plate 12 is fixed to the cross frame 1 at the top and an oil box 13 is fixedly installed at the bottom. An oil suction unit 31 is rotatably installed between every two oil boxes 13.

[0072] Each oil suction unit 31 includes two oil suction floats 311 and two oil guide grooves 312. The two oil suction floats 311 are arranged in parallel, one above the other. Both ends of each oil suction float 311 are fixedly connected to an independent turntable 313. Each turntable 313 is driven to rotate by a separate motor, and the turntables 313 located at both ends of the oil suction float 311 rotate in opposite directions. The turntables 313 are rotatably mounted on a switching plate 314, which is rotatably mounted on an oil box 13. Its rotation center is the center line of the distance between the two oil suction floats 311.

[0073] When the switching plate 314 is in a vertical position, the lower oil-absorbing float roller 311 is in the oil-absorbing position, and the upper oil-absorbing float roller 311 is in the oil-squeezing position. While the scraper plate 22 scrapes oil, the lower oil-absorbing float roller 311 begins to remove the residual oil film after scraping. The oil-absorbing float roller 311 is made of a flexible oil-absorbing material (such as polyurethane sponge), and its outer surface is provided with radially extending telescopic fins 3111. These radially extending telescopic fins 3111 extend during the oil-absorbing process (e.g., ...). Figure 23 As shown at point a), the increased contact area with the oil film improves the oil suction efficiency. During the oil squeezing process, the radial telescopic fins 3111 retract into the oil suction float roller 311 (as shown in point a). Figure 23 (As shown at point b), this reduces the outer diameter of the oil suction float roller 311, making it easier for the squeezed oil to fall into the oil guide groove 312.

[0074] The radial telescopic fins 3111 complete the telescopic process by setting an inflatable bladder 3112 (e.g. Figure 23As shown, the airbag 3112 is embedded in the oil suction float 311. When inflated, it pushes out the radial telescopic fins 3111. When deflated, it retracts into the oil suction float 3111 along with the radial telescopic fins 3111. In addition, the radial telescopic fins 3111 can also complete the telescopic process by setting springs and electromagnets, just like the push plate 23.

[0075] It should be noted that when there is only a thin oil layer on the surface of the wastewater, the oil scraper 22 can be raised off the water surface by using the telescopic rod 21 and the electric rotating joint 213. After that, the oil scraper 22 is not used, but the thin oil layer is removed by the oil suction float roller 311 (because the scraping method has limited effect on the thin oil layer, while the suction method is more suitable for the thin oil layer).

[0076] A ring gear 315 is fixedly installed on the side of the switching plate 314 facing the oil box 13. The ring gear 315 meshes with the drive gear 316. The drive gear 316 is powered by a motor to drive the ring gear 315 to rotate, thereby driving the switching plate 314 to rotate.

[0077] When the lower oil-absorbing float roller 311 reaches its saturation oil absorption capacity, the drive gear 316 drives the ring gear 315 to rotate, which in turn causes the switching plate 314 to rotate, switching the upper oil-absorbing float roller 311, which is in the oil-squeezing position, to the oil-absorbing position to continue the oil-absorbing operation. The saturated oil-absorbing float roller 311 is switched to the oil-squeezing position. The turntables 313 at both ends of the saturated oil-absorbing float roller 311 in the oil-squeezing position rotate in opposite directions under the drive of the motor. Through this reverse rotation, the grease in the oil-absorbing float roller 311 can be squeezed out.

[0078] Two oil guide grooves 312 are located between two oil suction float rollers 311, and are arranged in a mirror symmetrical layout. One oil guide groove 312 opens upwards, towards the oil suction float roller 311 located above; the other oil guide groove 312 opens downwards, towards the oil suction float roller 311 located below. The two ends of the two oil guide grooves 312 are respectively fixed on two switching plates 314. The switching plates 314 have oil holes 3141 at the corresponding positions of the oil guide grooves 312. The oil holes 3141 are connected to the oil box 13 through oil pipes 3142. The two ends of the oil guide grooves 312 are aligned with the oil holes 3141, and the bottom surface of the inner side of the oil guide grooves 312 is inclined towards the oil holes 3141 with a high middle and low two sides. This design allows the extruded grease to flow smoothly to the oil holes 3141 under the action of gravity and flow into the oil box 13 along the oil pipes 3142. In addition, the inner walls of the oil pipes 3142 and the oil holes 3141 are inclined, and the inclination direction is towards the oil box 13.

[0079] An oil collection tank 14 is fixedly installed on the top of the cross frame 1. An oil pump is installed inside the oil collection tank 14. The oil pump is connected to the oil box 13 through a hose 131 (for aesthetic purposes, the hose 131 can be hidden inside the support plate 12 and the cross frame 1). The grease in the oil box 13 is transported to the oil collection tank 14 through the hose 131 by the oil pump to complete the collection.

[0080] Reference Figure 20 The oil box 13 can be irregularly shaped to fill the gap between adjacent oil suction units 31, thereby improving the efficiency of the oil suction unit 31 in intercepting and removing the oil layer.

[0081] To further clarify, the aforementioned fixed connection should be interpreted broadly unless otherwise explicitly specified and limited. For example, it may be welding, gluing, or integral molding, or other conventional methods well known to those skilled in the art.

[0082] A method for using a coal mine wastewater pretreatment device, comprising the following steps:

[0083] S1: Based on the oil layer thickness data fed back by the oil layer detector, control the extension part 212 of the telescopic rod 21 to extend, and at the same time control the electric rotary joint 213 to rotate, thereby adjusting the height and tilt angle of the scraper 22 so that the scraper 22 can accurately fit the oil layer surface.

[0084] S2: Start the conveyor 111 to drive the front oil removal component 2 to run. The oil scraper 22 performs the initial scraping of floating oil on the water surface. The V-shaped structure formed by the pusher 23 and the oil scraper 22 pushes the oil layer to move towards the grease collection point of the pretreatment tank 112.

[0085] S3: While the scraper 22 scrapes the oil, the oil suction float 311 located below the rear oil removal component 3 begins to remove the oil film remaining after scraping. During the oil suction process, the radial telescopic fins 3111 on the outer surface of the oil suction float 311 extend to increase the contact area with the oil film and improve the suction efficiency.

[0086] S4: When the lower oil suction float 311 reaches saturation, the drive gear 316 drives the ring gear 315 to rotate, which in turn causes the switching plate 314 to rotate, switching the upper oil suction float 311, which is in the oil squeezing position, to the oil suction position to continue the oil suction operation, while the saturated oil suction float 311 is switched to the oil squeezing position.

[0087] S5: The radial telescopic fins 3111 of the saturated oil-absorbing floating roller 311 in the oil-squeezing position retract, and the turntables 313 at both ends rotate in opposite directions under the drive of the motor, squeezing out the grease in the oil-absorbing floating roller 311. The squeezed-out grease flows through the oil guide groove 312 to the oil hole 3141 and flows into the oil box 13 along the oil pipe 3142.

[0088] S6: The grease in the oil box 13 is transported through the hose 131 to the oil collection tank 14 at the top of the cross frame 1 by the oil pump to complete the collection.

[0089] S7: When the scraper 22 and the suction roller 311 reach the grease collection point of the pretreatment tank 112 and complete one "scraping-suction" stroke, control the pusher 23 to remove the grease accumulated on the surface of the scraper 22.

[0090] S8: Control the electromagnet 2114 to be energized, causing the movable block 2113 to vibrate, which in turn drives the push plate 23 to vibrate and impact, shaking off the oil layer attached to itself, in preparation for the next use.

[0091] The above description is only a preferred embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any equivalent substitutions or modifications made by those skilled in the art within the scope of the technology disclosed in the present invention, based on the technical solution and inventive concept of the present invention, should be covered within the scope of protection of the present invention.

Claims

1. A coal mine wastewater pretreatment device, characterized in that, include: A crossbeam (1) is mounted on a conveyor (111) via a lifting column (11); The front degreasing assembly (2) includes a telescopic rod (21), a scraper (22) and a pusher (23). The top of the telescopic rod (21) is rotatably connected to the crossbar (1) and the bottom is rotatably connected to the scraper (22). The pusher (23) is mounted on the telescopic rod (21) and the bottom of the pusher (23) is in staggered contact with the surface of the scraper (22). The post-oil removal assembly (3) includes multiple oil suction units (31). Multiple support plates (12) are evenly arranged below the cross frame (1). An oil box (13) is fixedly installed below each support plate (12). An oil suction unit (31) is rotatably installed between every two oil boxes (13). Each oil suction unit (31) includes multiple oil suction floats (311) and an oil guide groove (312). The oil suction unit (31) switches the position of the oil suction floats (311) by rotating itself. Each oil suction float (311) has a turntable (313) at both ends for squeezing out the oil in the oil suction floats (311). The oil guide groove (312) is used to guide the squeezed oil to the oil box (13). The oil suction unit (31) includes two oil suction floats (311), which are arranged in parallel, one above the other. Both ends of each oil suction float (311) are fixedly connected to an independent turntable (313). The turntables (313) are all driven to rotate by a motor, and the turntables (313) located at both ends of the oil suction float (311) rotate in opposite directions. The turntables (313) are all rotatably mounted on the switching plate (314), and the switching plate (314) is rotatably mounted on the oil box (13). The rotation center of the switching plate (314) is the center line of the distance between the two oil-absorbing floats (311). The switching plate (314) achieves the position switching of the two oil-absorbing floats (311) by rotating itself. When the switching plate (314) is in a vertical position, the lower oil suction float (311) is in the oil suction position, and the upper oil suction float (311) is in the oil squeezing position.

2. The coal mine wastewater pretreatment device according to claim 1, characterized in that, The oil suction unit (31) includes two oil guide grooves (312), and the two oil guide grooves (312) are located between two oil suction floating rollers (311); The two oil guide grooves (312) are arranged in a mirror symmetrical layout. One of the oil guide grooves (312) opens upwards and faces the oil suction float (311) located above; the other oil guide groove (312) opens downwards and faces the oil suction float (311) located below. The two ends of the two oil guide grooves (312) are respectively fixed on two switching plates (314). The switching plates (314) have oil holes (3141) at the corresponding positions of the oil guide grooves (312). The oil holes (3141) are connected to the oil box (13) through the oil pipe (3142). The two ends of the oil guide groove (312) are aligned with the oil hole (3141), and the bottom surface of the inner side of the oil guide groove (312) is inclined towards the oil hole (3141) with a high middle and low sides. An oil collection tank (14) is fixedly installed on the top of the cross frame (1). An oil pump is installed inside the oil collection tank (14), and the oil pump is connected to the oil box (13) through a hose (131).

3. The coal mine wastewater pretreatment device according to claim 2, characterized in that, A ring gear (315) is fixedly installed on the side of the switching plate (314) facing the oil box (13). The ring gear (315) meshes with the drive gear (316). The drive gear (316) is powered by a motor to drive the ring gear (315) to rotate, thereby driving the switching plate (314) to rotate. The oil pipe (3142) passes through the center of the ring gear (315), and the two ends of the oil pipe (3142) are respectively sealed to the oil hole (3141) and the oil box (13); The inner walls of the oil pipe (3142) and oil hole (3141) are inclined, and the inclination direction is towards the oil box (13).

4. The coal mine wastewater pretreatment device according to claim 3, characterized in that, The oil-absorbing float roller (311) is made of flexible oil-absorbing material, and the outer surface of the oil-absorbing float roller (311) is provided with radial telescopic fins (3111).

5. A coal mine wastewater pretreatment device according to claim 4, characterized in that, The conveyor (111) is installed in a pretreatment tank (112) for treating coal mine wastewater, and an oil layer detector is provided in the conveyor (111) or the pretreatment tank (112).

6. A coal mine wastewater pretreatment device according to claim 5, characterized in that, The telescopic rod (21) includes a fixed part (211) and a telescopic part (212). The fixed part (211) is rotatably connected to the cross frame (1) by means of an electric rotating joint (213), and the telescopic part (212) is also rotatably connected to the oil scraper (22) by means of an electric rotating joint (213).

7. A coal mine wastewater pretreatment device according to claim 6, characterized in that, The fixed part (211) of the telescopic rod (21) has a movable groove (2111) on the side facing the push plate (23). A spring (2112) is fixedly installed in the movable groove (2111). A movable block (2113) is fixedly connected below the spring (2112). The movable block (2113) is fixedly connected to the push plate (23). The movable block (2113) is a magnetic block, and the movable slot (2111) has an electromagnet (2114) above the movable block (2113).

8. A method of using a coal mine wastewater pretreatment device, comprising using the coal mine wastewater pretreatment device as described in claim 7, characterized in that, Includes the following steps: S1: Based on the oil layer thickness data fed back by the oil layer detector, control the extension part (212) of the telescopic rod (21) to extend, and at the same time control the electric rotary joint (213) to rotate, thereby adjusting the height and tilt angle of the scraper (22) so that the scraper (22) can accurately fit the oil layer surface. S2: Start the conveyor (111) to drive the front oil removal component (2) to run. The oil scraper (22) scrapes off the floating oil on the water surface for the first time. The V-shaped structure formed by the pusher (23) and the oil scraper (22) pushes the oil layer to move towards the grease collection point of the pretreatment tank (112). S3: While the scraper (22) scrapes the oil, the oil suction float (311) located below the rear oil removal component (3) begins to remove the oil film remaining after scraping. During the oil suction process, the radial telescopic fins (3111) on the outer surface of the oil suction float (311) extend to increase the contact area with the oil film and improve the suction efficiency. S4: When the lower oil suction float (311) reaches saturation, the drive gear (316) drives the ring gear (315) to rotate, which in turn causes the switching plate (314) to rotate, switching the upper oil suction float (311) which is in the oil squeezing position to the oil suction position to continue the oil suction operation, while the saturated oil suction float (311) is switched to the oil squeezing position. S5: The radial telescopic fins (3111) of the saturated oil-absorbing float (311) in the oil-squeezing position retract, and the turntables (313) at both ends rotate in opposite directions under the drive of the motor, squeezing out the grease in the oil-absorbing float (311). The squeezed-out grease flows through the oil guide groove (312) to the oil hole (3141) and flows into the oil box (13) along the oil pipe (3142). S6: The grease in the oil box (13) is transported through the hose (131) to the oil collection tank (14) at the top of the cross frame (1) by the oil pump to complete the collection; S7: When the oil scraper (22) and the oil suction roller (311) reach the grease collection point of the pretreatment tank (112) and complete one "oil scraping-oil suction" stroke, control the push plate (23) to remove the grease accumulated on the surface of the oil scraper (22); S8: Control the electromagnet (2114) to be energized, so that the movable block (2113) vibrates, driving the push plate (23) to vibrate and collide, shaking off the oil layer attached to itself, in preparation for the next use.

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