Sewage treatment equipment for constructional engineering

Abstract

The invention belongs to the technical field of sewage treatment equipment, and particularly provides sewage treatment equipment for constructional engineering, which comprises a sewage pool, a lifting type impurity collecting mechanism is arranged in the sewage pool, one end of the sewage pool is connected with a suspension type water absorption mechanism, one side, far away from the sewage pool, of the suspension type water absorption mechanism is connected with a sedimentation tank, and the sedimentation tank is connected with a water storage tank. A first screen and a second screen are respectively arranged in the sedimentation tank in a sliding manner, the first screen is obliquely arranged, and the second screen is perpendicular to the bottom wall of the sedimentation tank; according to the sewage treatment equipment for constructional engineering, sewage can be pumped from top to bottom, the broken grain screen is prevented from being damaged, sewage can be filtered for multiple times, oil stains in the sewage can be removed, in addition, the pre-acting principle is combined with a lifting structure, separated large solid particles and silt can be conveniently collected and treated in a unified mode, and the sewage treatment efficiency is improved. The sewage treatment efficiency is improved.

Description

Technical Field

[0001] The present invention belongs to the technical field of sewage treatment equipment, and specifically refers to a sewage treatment equipment for construction projects. Background Art

[0002] The sewage in construction projects is mainly the mixed sewage of construction wastewater and rainwater generated during the construction process of construction sites. The sewage contains a large amount of cement, sand, suspended solids and oil stains generated by mechanical equipment. If directly discharged, it will pollute the environment and needs to be filtered and then reused or discharged.

[0003] At present, the existing sewage treatment equipment for construction projects has the following problems: The existing sewage treatment equipment uses a filter screen to preferentially filter out larger solid particles and sediment in the sewage. Under the impact of the water flow containing solid particles and sediment, the filter screen is easily blocked and damaged, and the filtered larger solid particles and sediment are difficult to collect and process, reducing the sewage treatment effect; at the same time, the filter screen for filtering fine suspended solids is difficult to disassemble, and when the filter screen is disassembled and cleaned, the machine needs to be stopped, reducing the treatment efficiency; in addition, the existing sewage treatment equipment is difficult to remove the oil stains mixed in the sewage, making the sewage treatment incomplete and difficult to reuse. Summary of the Invention

[0004] To solve the above existing problems, the present invention provides a sewage treatment equipment for construction projects that can extract sewage from top to bottom, avoid damage to the crushed particle sieve, and can filter sewage multiple times to remove the oil stains in the sewage. In addition, by using the pre-action principle combined with the lifting structure, the separated larger solid particles and sediment are convenient for unified collection and treatment, improving the sewage treatment efficiency.

[0005] To achieve the above object, the technical solution adopted by the present invention is as follows: A sewage treatment equipment for construction projects provided by the present invention includes a sewage tank, a lifting type impurity collection mechanism is arranged in the sewage tank, one end of the sewage tank is connected with a suspended water absorption mechanism, the side of the suspended water absorption mechanism away from the sewage tank is connected with a sedimentation tank, a first sieve filter and a second sieve filter are slidably arranged in the sedimentation tank, the first sieve filter is inclined, the second sieve filter is perpendicular to the bottom wall of the sedimentation tank, the first sieve filter and the second sieve filter divide the interior of the sedimentation tank into a coarse filtration chamber, a fine filtration chamber and a liquid discharge chamber, the coarse filtration chamber, the fine filtration chamber and the liquid discharge chamber are arranged in sequence from near to far from the suspended water absorption mechanism, a stirring and spraying mechanism is arranged in the coarse filtration chamber, and a flotation oil removal mechanism is arranged in the fine filtration chamber; the sewage in the sewage tank is sucked into the sedimentation tank through the suspended water absorption mechanism and respectively passes through the coarse filtration chamber, the fine filtration chamber and the liquid discharge chamber, and is discharged after being filtered by the first sieve filter and the second sieve filter.

[0006] Furthermore, the suspended water absorption mechanism includes a transition connecting block, a water collection frame, a water absorption hose, and a floating plate. The transition connecting block is connected between the sewage tank and the sedimentation tank. A water pump is provided on the transition connecting block. The water absorption hose is connected to the water inlet of the water pump. The water collection frame is arranged in the sewage tank, and the lower end of the water collection frame is open. The lower edge of the water collection frame is serrated. A particle screening mesh is provided in the water collection frame. The water absorption hose is communicated with the water collection frame. The floating plate is arranged around the outer wall of the water collection frame and is located above the particle screening mesh. During use, the floating plate drives the water collection frame to float on the water surface. The content of solid particles and sediment in the upper-layer sewage is relatively small. The water pump works, and the upper-layer sewage is suctioned through the water absorption hose and the water collection frame. The particle screening mesh preliminarily filters large-particle impurities and sediment in the water. During this process, the floating plate floats on the water surface. Since the floating plate is located above the particle screening mesh and part of the oil in the water floats on the water surface, when the floating plate floats on the water surface, the particle screening mesh and part of the water collection frame are in the water body, reducing the suction of oil stains and at the same time avoiding the abrasion of the water pump by large-particle impurities and sediment.

[0007] Furthermore, the stirring and spraying mechanism includes a stirring shaft, a liquid spraying plate, and stirring rods. The stirring shaft is symmetrically rotatably arranged on the inner side wall of the coarse filtration chamber. The liquid spraying plate is arranged on the stirring shaft. The stirring rods are uniformly distributed in the circumferential direction and are connected between the symmetric liquid spraying plates. The stirring rods move above the first screen mesh. Furthermore, the air flotation oil removal mechanism includes a rotating motor and a rotating disk. The rotating motor is embedded in the bottom wall of the fine filtration chamber. The rotating disk is arranged at the output end of the rotating motor. Rotating rods are evenly distributed on the rotating disk in the circumferential direction, and the rotating rods move below the first screen mesh.

[0008] Furthermore, the lifting type impurity collection mechanism includes a lifting motor, a lifting threaded column, a pulling plate, a bearing plate, and a pulling steel wire rope. The lifting motors are symmetrically arranged on both sides of the sewage tank. The lifting threaded columns are symmetrically rotatably arranged on the lifting motors. The symmetric lifting threaded columns are respectively electrically connected to the output ends of the lifting motors. The pulling plate is meshed and sleeved on the symmetric lifting threaded columns. The pulling plate slides up and down on the outer side wall of the sewage tank as the lifting threaded columns rotate. The bearing plate slides inside the sewage tank. The pulling steel wire ropes are connected to the four corners of the bearing plate. Pressure-bearing rods are symmetrically rotatably arranged on the upper wall of the sewage tank. The pulling steel wire ropes bypass the pressure-bearing rods and are connected to the pulling plate. When the sewage treatment is completed, the lifting motor is started, the lifting threaded columns rotate, and then the pulling plate engaged with them moves downward. During the downward movement of the pulling plate, the bearing plate is pulled to move upward in the sewage tank through the pulling steel wire ropes. The bearing plate carries the large solid particles and sediment precipitated in the sewage and moves up to the upper part of the sewage tank, facilitating the cleaning by the staff. Preferably, positioning columns are vertically and symmetrically arranged at one end of the bearing plate close to the transition connecting block, and both ends of the floating plate are slidably sleeved on the symmetric positioning columns; a scraping strip is covered on the upper edge of the bearing plate, and the scraping strip scrapes the dirt on the inner wall of the sewage tank when the bearing plate is lifted.

[0009] Furthermore, a transition channel is provided inside the transition connecting block. The transition channel is connected between the output end of the sedimentation tank and the water pump. The transition channel is connected to the lower part of the sedimentation tank. A drain port is provided through the lower part of the side of the sedimentation tank away from the transition channel, and a water flow detector is provided at the drain port; first sieve filter grooves, second sieve filter grooves and detection grooves are respectively provided on the inner side wall of the sedimentation tank. The first sieve filter groove is inclined, and the first sieve filter groove is inclined towards the second sieve filter groove. The second sieve filter groove is vertically arranged. Two first sieve filter grooves and two second sieve filter grooves are arranged side by side respectively. The first sieve filter screen is slidably arranged in the first sieve filter groove, and the second sieve filter screen is slidably arranged in the second sieve filter groove; the detection groove is vertically arranged above the first sieve filter groove, and a detection floating plate is slidably arranged in the detection groove. Sensors are provided at both ends of the detection floating plate, and the sensors adopt EP displacement sensors. During use, the water flow detector at the drain port detects the water flow velocity here. If the water flow velocity significantly slows down and the sensors at the ends of the detection floating plate are continuously triggered, it means that the water in the coarse filter chamber or the fine filter chamber is difficult to flow out, and the first sieve filter screen or the second sieve filter screen is blocked, making it difficult for the water flow to pass through. The main controller issues an alarm to prompt the staff to come and check in time. When replacing the first sieve filter screen or the second sieve filter screen, just insert the new first sieve filter screen into another first sieve filter groove, or insert the new second sieve filter screen into another second sieve filter groove, and then pull out the blocked first sieve filter screen or the second sieve filter screen. The operation is convenient and does not require shutdown.

[0010] Furthermore, the stirring and spraying mechanism further includes a spraying box. The spraying box is arranged on the side wall of the sedimentation tank. A stirring motor is embedded in the spraying box. One side of the stirring shaft is connected to the output end of the stirring motor. A liquid pumping pump is embedded in the liquid spraying plate. Spraying ports are evenly distributed on the stirring rod. The water inlet of the liquid pumping pump is communicated with the spraying box, and the water outlet of the liquid pumping pump is communicated with the spraying ports. The stirring rod moves between the detection floating plate and the inner wall of the sedimentation tank.

[0011] Furthermore, the air flotation oil removal mechanism further includes an air pump. The air pump is embedded on the rotating disk. Ventilation holes are evenly distributed on the rotating rod. The output end of the air pump is communicated with the ventilation holes; During use, the liquid extraction pump extracts the flocculant in the spraying tank and sprays it out through the liquid spraying port. After the flocculant is mixed with the sewage, it promotes the precipitation of fine suspended solids. The agitation motor drives the agitation shaft to rotate, and then drives the agitation rods evenly distributed in a circle to rotate, so that the flocculant sprayed out from the liquid spraying port is evenly sprinkled in the sewage. At the same time, the sewage is agitated to quickly react with the flocculant. The sediment in the sewage is filtered by the first sieve filter, and the oil stains floating on the water surface are filtered out by the first sieve filter. The filtered water flows into the fine sieve cavity; at the same time, the rotation motor is started, the air pump works, and the rotating rod rotates to agitate the water body below, making the water body in a moving state, accelerating the reaction between the flocculant and the water body. The air pump continuously passes air bubbles into the water body through the ventilation holes. During the rising process of the micro air bubbles in the water body, they continuously adhere to the oil stains in the water body and make them float upward. During the floating process, they gradually adhere to the lower part of the first sieve filter, and the air bubbles continue to rise through the first sieve filter, assisting in removing oil from the sewage in the coarse sieve cavity.

[0012] Furthermore, a miscellaneous collection basket is slidably and internally embedded on the bottom wall of the sedimentation tank. The miscellaneous collection basket is slidably arranged between the lower end of the first sieve filter and the inner wall of the sedimentation tank, and the miscellaneous collection basket is arranged in a drawable manner through the side wall of the sedimentation tank.

[0013] Preferably, a main controller is provided on the side wall of the sedimentation tank. The main controller is a PLC controller, and the lifting motor, the water extraction pump, the agitation motor, the liquid extraction pump, the inductor, the water flow detector, the rotation motor and the air pump are respectively electrically connected to the main controller.

[0014] The beneficial effects achieved by the present invention with the above structure are as follows: 1. A sewage treatment device for construction engineering provided by the present invention utilizes the buoyancy of the floating plate to enable the water extraction pump to extract sewage from top to bottom. The solid particle and sediment content in the upper-layer sewage is relatively small, avoiding the abrasion of the water extraction pump by large-particle impurities and sediment; at the same time, since the floating plate is arranged above the particle crushing sieve, and part of the oil stains in the water float on the water surface. When the floating plate floats on the water surface, the particle crushing sieve and part of the water collection frame are in the water body, effectively reducing the inhalation of oil stains. 2. The first sieve filter and the second sieve filter are provided to filter the sewage multiple times, and the water flow detector and the inductor are used to detect the filtration efficiency of the first sieve filter and the second sieve filter; at the same time, the pre-action principle is adopted. When the first sieve filter or the second sieve filter is blocked, only need to insert a new first sieve filter into another first sieve filter slot, or insert a new second sieve filter into another second sieve filter slot, and then pull out the blocked first sieve filter or second sieve filter. The operation is convenient and there is no need to stop the machine. 3. By using the air flotation method, an air flotation oil removal mechanism is set up. The rotating rod rotates to stir the water body below, making the water body in a moving state, accelerating the reaction between the flocculant and the water body. The air pump continuously introduces air bubbles into the water body through the air vent holes. During the rising process of the micro-bubbles in the water body, they continuously adhere to the oil stains in the water body and make them float upward. During the floating process, they gradually adhere to the lower part of the first screen filter, while the bubbles continue to rise through the first screen filter to assist in oil removal from the sewage in the coarse screening chamber; 4. By adopting the pre-action principle and combining with the lifting structure, the downward movement of the pulling plate drives the bearing plate to move upward in the sewage tank. During this process, the scraping strip closely adheres to the inner wall of the sewage tank and scrapes off the dirt on it. The bearing plate carries the large solid particles and sediment precipitated in the sewage and moves them upward to the upper part of the sewage tank, making it convenient to uniformly collect and process the separated larger solid particles and sediment, and improving the sewage treatment efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a schematic structural diagram of a sewage treatment device for construction engineering provided by the present invention; Figure 2 It is a combined structural schematic diagram of the sewage tank and the lifting type impurity collection mechanism; Figure 3 It is a schematic structural diagram of the suspended water absorption mechanism; Figure 4 It is a combined structural schematic diagram of the water collection frame and the floating plate; Figure 5 It is a combined structural schematic diagram of the sedimentation tank, the first screen filter, the second screen filter, the stirring and spraying mechanism and the air flotation oil removal mechanism; Figure 6 It is a top view of the combined structure of the sedimentation tank, the first screen filter, the second screen filter, the stirring and spraying mechanism and the air flotation oil removal mechanism; Figure 7 For Figure 6 The sectional structural schematic diagram at A - A in Figure 8 It is a schematic structural diagram inside the fine filtering chamber; Figure 9 For Figure 8 The partial enlarged structural schematic diagram at B in Figure 10 For Figure 5 The partial enlarged structural schematic diagram at C in

[0016] Among them, 1. sewage tank, 2. lifting type impurity collection mechanism, 3. suspended water absorption mechanism, 4. sedimentation tank, 5. stirring and spraying mechanism, 6. first sieve filter, 7. second sieve filter, 8. air flotation oil removal mechanism, 9. coarse filtration chamber, 10. fine filtration chamber, 11. liquid discharge chamber, 12. lifting motor, 13. lifting threaded column, 14. pulling plate, 15. bearing plate, 16. pulling steel wire, 17. positioning column, 18. scraping strip, 19. pressure bearing rod, 20. transition connecting block, 21. water pump, 22. water absorption hose, 23. water collection frame, 24. floating plate, 25. transition channel, 26. particle crushing sieve, 27. spraying tank, 28. stirring shaft, 29. liquid spraying plate, 30. stirring rod, 31. liquid spraying port, 32. detection tank, 33. detection floating plate, 34. impurity collection basket, 35. first sieve filtration tank, 36. second sieve filtration tank, 37. rotation motor, 38. rotating disc, 39. air pump, 40. rotating rod, 41. ventilation hole, 42. drain outlet. Detailed implementation mode

[0017] The technical solutions of the present invention will be further described in detail below in conjunction with specific embodiments. Parts of the technical features or connection relationships of the present invention that are not described in detail are all prior arts adopted.

[0018] The present invention will be further described in detail below in conjunction with the accompanying drawings.

[0019] As Figures 1 - 10 shown, a sewage treatment device for construction engineering provided by the present invention includes a sewage tank 1. A lifting type impurity collection mechanism 2 is arranged in the sewage tank 1. One end of the sewage tank 1 is connected with a suspended water absorption mechanism 3. The side of the suspended water absorption mechanism 3 far away from the sewage tank 1 is connected with a sedimentation tank 4. A first sieve filter 6 and a second sieve filter 7 are slidably arranged in the sedimentation tank 4. The first sieve filter 6 is inclined, and the second sieve filter 7 is perpendicular to the bottom wall of the sedimentation tank 4. The first sieve filter 6 and the second sieve filter 7 divide the interior of the sedimentation tank 4 into a coarse filtration chamber 9, a fine filtration chamber 10 and a liquid discharge chamber 11. The coarse filtration chamber 9, the fine filtration chamber 10 and the liquid discharge chamber 11 are arranged in sequence from near to far from the suspended water absorption mechanism 3. A stirring and spraying mechanism 5 is arranged in the coarse filtration chamber 9, and an air flotation oil removal mechanism 8 is arranged in the fine filtration chamber 10.

[0020] The lifting type impurity collecting mechanism 2 includes a lifting motor 12, which is symmetrically arranged on both sides of the sewage tank 1. Lifting threaded columns 13 are symmetrically and rotatably arranged on the lifting motor 12. The symmetric lifting threaded columns 13 are respectively electrically connected to the output ends of the lifting motor 12. A pulling plate 14 is meshed and sleeved on the symmetric lifting threaded columns 13. A bearing plate 15 is slidably arranged inside the sewage tank 1. Pulling steel ropes 16 are connected to the four corners of the bearing plate 15. Pressure-bearing rods 19 are symmetrically and rotatably arranged on the upper wall of the sewage tank 1. The pulling steel ropes 16 bypass the pressure-bearing rods 19 and are connected to the pulling plate 14. The pulling plate 14 slides up and down on the outer side wall of the sewage tank 1 as the lifting threaded columns 13 rotate, and pulls the bearing plate 15 to slide up and down inside the sewage tank 1 through the pulling steel ropes 16. Positioning columns 17 are vertically and symmetrically arranged at one end of the bearing plate 15 close to the suspended water absorption mechanism 3. A scraping strip 18 is wrapped around the upper edge of the bearing plate 15. The scraping strip 18 scrapes the dirt on the inner wall of the sewage tank 1 when the bearing plate 15 is lifted.

[0021] The suspended water absorption mechanism 3 includes a transition connecting block 20, which is connected between the sewage tank 1 and the sedimentation tank 4. A water pump 21 is arranged on the transition connecting block 20. The water inlet of the water pump 21 is connected with a water absorption hose 22. A water collecting frame 23 is arranged inside the sewage tank 1. The lower end of the water collecting frame 23 is open, and the lower edge of the water collecting frame 23 is serrated. A particle screening mesh 26 is arranged inside the water collecting frame 23. The water absorption hose 22 is communicated with the water collecting frame 23. Floating plates 24 are arranged around the outer side wall of the water collecting frame 23. The two ends of the floating plates 24 are respectively slidably sleeved on the symmetric positioning columns 17. The floating plates 24 are arranged above the particle screening mesh 26. A transition channel 25 is arranged inside the transition connecting block 20, and the transition channel 25 is communicated between the sedimentation tank 4 and the output end of the water pump 21. The transition channel 25 is communicated with the lower part of the sedimentation tank 4. A drain port 42 is arranged through the lower part of one side of the sedimentation tank 4 far from the transition channel 25, and a water flow detector is arranged at the drain port 42.

[0022] First sieve filter grooves 35, second sieve filter grooves 36 and detection grooves 32 are respectively arranged on the inner side wall of the sedimentation tank 4. The first sieve filter grooves 35 are inclined, and the first sieve filter grooves 35 are inclined towards the second sieve filter grooves 36. The second sieve filter grooves 36 are vertically arranged. Two first sieve filter grooves 35 and two second sieve filter grooves 36 are respectively arranged side by side. A first sieve filter screen 6 is slidably arranged inside the first sieve filter grooves 35, and a second sieve filter screen 7 is slidably arranged inside the second sieve filter grooves 36. The detection grooves 32 are vertically arranged above the first sieve filter grooves 35. A detection floating plate 33 is slidably arranged inside the detection grooves 32, and sensors are arranged at both ends of the detection floating plate 33. A impurity collecting basket 34 is slidably and embeddedly arranged on the bottom wall of the sedimentation tank 4. The impurity collecting basket 34 is slidably arranged between the lower end of the first sieve filter screen 6 and the inner wall of the sedimentation tank 4, and the impurity collecting basket 34 is arranged in a pull-out manner through the side wall of the sedimentation tank 4.

[0023] The stirring and spraying mechanism 5 includes a stirring shaft 28 and a spraying tank 27. The stirring shaft 28 is symmetrically and rotatably arranged on the inner side wall of the coarse filtration chamber 9. The spraying tank 27 is arranged on the side wall of the sedimentation tank 4. A stirring motor is embedded in the spraying tank 27. One side of the stirring shaft 28 is connected to the output end of the stirring motor. A liquid spraying plate 29 is arranged on the stirring shaft 28. Stirring rods 30 are evenly connected in the circumferential direction between the symmetric liquid spraying plates 29. The stirring rods 30 move above the first screen 6. Liquid spraying ports 31 are evenly arranged on the stirring rods 30. A liquid extraction pump is embedded in the liquid spraying plate 29. The water inlet of the liquid extraction pump is communicated with the spraying tank 27, and the water outlet of the liquid extraction pump is communicated with the liquid spraying ports 31. The stirring rods 30 move between the detection floating plate 33 and the inner wall of the sedimentation tank 4.

[0024] The air flotation oil removal mechanism 8 includes a rotating motor 37. The rotating motor 37 is embedded in the bottom wall of the fine filtration chamber 10. A rotating disk 38 is arranged at the output end of the rotating motor 37. Rotating rods 40 are evenly arranged on the rotating disk 38 in the circumferential direction. Ventilation holes 41 are evenly arranged on the rotating rods 40. The rotating rods 40 move below the first screen 6. An air pump 39 is embedded in the rotating disk 38. The output end of the air pump 39 is communicated with the ventilation holes 41.

[0025] A main controller is arranged on the side wall of the sedimentation tank 4. The main controller is a PLC controller. The lifting motor 12, the water extraction pump 21, the stirring motor, the liquid extraction pump, the inductor, the flow rate detector, the rotating motor 37 and the air pump 39 are respectively electrically connected to the main controller.

[0026] Working principle and working process: In specific use, the staff respectively check the usage status of the crushed particle screen 26, the first screen 6 and the second screen 7. If there is damage or blockage, it needs to be replaced in time; connect the water inlet of the sewage tank 1 to the sewage pipe drain pipe, and connect the drain port 42 of the sedimentation tank 4 to the circulating water tank.

[0027] During the process of sewage flowing into the sewage tank 1, larger solid particles and sediment sink due to their gravity and gradually accumulate on the bearing plate 15; when a large amount of sewage has accumulated in the sewage tank 1, start the main controller. At this time, the floating plate 24 drives the water collection frame 23 to float on the water surface. The content of solid particles and sediment in the upper layer of sewage is relatively small. The water extraction pump 21 works to suck the upper layer of sewage through the water absorption hose 22 and the water collection frame 23 into the transition channel 25. The crushed particle screen 26 preliminarily filters large particle impurities and sediment in the water. During this process, the floating plate 24 floats on the water surface and slides on the positioning column 17 as the water volume increases or decreases; since the floating plate 24 is arranged above the crushed particle screen 26 and part of the oil in the water floats on the water surface, when the floating plate 24 floats on the water surface, the crushed particle screen 26 and part of the water collection frame 23 are in the water body, reducing the suction of oil stains and at the same time avoiding the abrasion of the water extraction pump 21 by large particle impurities and sediment.

[0028] The sewage after primary screening flows into the sedimentation tank 4 through the transition channel 25. The sewage first flows into the coarse screening chamber. At this time, the agitation motor and the liquid extraction pump are started. The liquid extraction pump extracts the flocculant in the spraying tank 27 and sprays it out through the liquid spraying port 31. After the flocculant is mixed with the sewage, it promotes the precipitation of fine suspended matters. The agitation motor drives the agitation shaft 28 to rotate, and then drives the circumferentially evenly distributed agitation rods 30 to rotate, so that the flocculant sprayed out from the liquid spraying port 31 is evenly sprinkled in the sewage. At the same time, the sewage is agitated to quickly react with the flocculant. The sediment in the sewage is filtered by the first sieve filter mesh 6, and the accumulated sediment slides down along the inclined first sieve filter mesh 6 into the impurity collection basket 34, while the oil stains floating on the water surface are filtered out by the first sieve filter mesh 6. The filtered water flows into the fine screening chamber. At the same time, the rotation motor 37 is started, the air pump 39 works, the rotating rod 40 rotates to agitate the water body below, so that the water body is in a moving state, accelerating the reaction between the flocculant and the water body. The air pump 39 continuously introduces air bubbles into the water body through the air vent holes 41. During the rising process of the micro air bubbles in the water body, they continuously adhere to the oil stains in the water body and make them float upward. During the upward floating process, they gradually adhere to the lower part of the first sieve filter mesh 6, while the air bubbles pass through the first sieve filter mesh 6 and continue to rise, assisting in removing oil from the sewage in the coarse screening chamber. The remaining tiny impurities in the filtered water are filtered out by the second sieve filter mesh 7. The filter holes of the second sieve filter mesh 7 are smaller than those of the first sieve filter mesh 6. The filtered water is discharged through the drain port 42.

[0029] When the water in the sedimentation tank 4 has not reached the position of the detection floating plate 33, the pumping speed of the water extraction pump 21 reaches the maximum. As the water volume in the sedimentation tank 4 increases, the detection floating plate 33 floats on the water surface and slides upward in the detection groove 32 accordingly. When the water volume causes the detection floating plate 33 to float to the uppermost end of the detection groove 32, the sensor at the end of the detection floating plate 33 is triggered, causing the pumping speed of the water extraction pump 21 to decrease and gradually reach a uniform speed, so that the water output and the water input in the sedimentation tank 4 gradually reach balance.

[0030] The water flow detector at the drain port 42 detects the water flow velocity here. If the water flow velocity significantly slows down and the sensor at the end of the detection floating plate 33 is continuously triggered, it means that the first sieve filter mesh 6 or the second sieve filter mesh 7 is blocked, making it difficult for the water flow to pass through. The main controller issues an alarm to promptly prompt the staff to come and check. When replacing the first sieve filter mesh 6 or the second sieve filter mesh 7, only need to insert the new first sieve filter mesh 6 into another first sieve filter slot 35, or insert the new second sieve filter mesh 7 into another second sieve filter slot 36, and then pull out the blocked first sieve filter mesh 6 or the second sieve filter mesh 7. The operation is convenient and does not require shutdown.

[0031] After the sewage treatment is completed, the impurity collection basket 34 is pulled out from the side wall of the sedimentation tank 4, and the first sieve filter 6 and the second sieve filter 7 are taken out for cleaning. Subsequently, the lifting motor 12 is started, the lifting threaded column 13 rotates, and then the pulling plate 14 engaged therewith moves downward. During the downward movement of the pulling plate 14, the bearing plate 15 is pulled upward in the sewage tank 1 through the pulling steel rope 16. During this process, the scraping strip 18 clings to the inner wall of the sewage tank 1 and scrapes off the dirt thereon. The bearing plate 15 carries the large solid particles and sediment precipitated in the sewage and moves upward to the upper part of the sewage tank 1, facilitating the cleaning by the staff.

[0032] It should be noted that the program programming applications of the logic control module and the timing control module of the main controller, as well as the applications of the sensors and the water flow detectors, are prior arts and will not be elaborated herein.

[0033] The above is the overall working process of the present invention. Just repeat these steps during the next use.

[0034] It should be noted that in this article, relational terms such as first and second are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between these entities or operations. Moreover, the term "comprising", "including" or any other variant thereof is intended to cover non-exclusive inclusion, so that a process, method, article or device comprising a series of elements not only includes those elements, but also includes other elements not expressly listed, or further includes elements inherent to such process, method, article or device.

[0035] The present invention and its embodiments have been described above. Such description is not restrictive. What is shown in the drawings is only one of the embodiments of the present invention, and the actual structure is not limited thereto. Generally speaking, if those of ordinary skill in the art are inspired by it and design similar structural modes and embodiments without creative efforts without departing from the purpose of the present invention, they shall fall within the protection scope of the present invention.

Claims

1. A sewage treatment device for construction projects, including a sewage tank, characterized in that: A lifting type impurity collection mechanism is arranged in the sewage tank. One end of the sewage tank is connected with a floating water absorption mechanism. One side of the floating water absorption mechanism far away from the sewage tank is connected with a sedimentation tank. A first sieve filter and a second sieve filter are slidably arranged in the sedimentation tank. The first sieve filter is arranged obliquely, and the second sieve filter is perpendicular to the bottom wall of the sedimentation tank. The first sieve filter and the second sieve filter divide the interior of the sedimentation tank into a coarse filtration chamber, a fine filtration chamber and a liquid drainage chamber. The coarse filtration chamber, the fine filtration chamber and the liquid drainage chamber are arranged in sequence from near to far from the floating water absorption mechanism. A stirring and spraying mechanism is arranged in the coarse filtration chamber, and a flotation oil removal mechanism is arranged in the fine filtration chamber; The floating water absorption mechanism includes a transition connecting block, a water collection frame, a water absorption hose and a floating plate. The transition connecting block is connected between the sewage tank and the sedimentation tank. A water pump is arranged on the transition connecting block. The water absorption hose is connected with the water inlet of the water pump. The water collection frame is arranged in the sewage tank, and the lower end of the water collection frame is open. The lower end edge of the water collection frame is serrated. A particle crushing sieve is arranged in the water collection frame. The water absorption hose is communicated with the water collection frame. The floating plate is arranged around the outer side wall of the water collection frame, and the floating plate is arranged above the particle crushing sieve; The stirring and spraying mechanism includes a stirring shaft, a liquid spraying plate and a stirring rod. The stirring shaft is symmetrically and rotatably arranged on the inner side wall of the coarse filtration chamber. The liquid spraying plate is arranged on the stirring shaft. The stirring rods are uniformly arranged in the circumferential direction between the symmetric liquid spraying plates, and the stirring rods move above the first sieve filter; The flotation oil removal mechanism includes a rotating motor and a rotating disc. The rotating motor is embedded in the bottom wall of the fine filtration chamber. The rotating disc is arranged at the output end of the rotating motor. Rotating rods are uniformly arranged in the circumferential direction on the rotating disc, and the rotating rods move below the first sieve filter.

2. The sewage treatment equipment for construction engineering according to claim 1, characterized in that: The lifting type impurity collection mechanism includes a lifting motor, a lifting threaded column, a pulling plate, a bearing plate and a pulling steel wire rope. The lifting motors are symmetrically arranged on both sides of the sewage tank. The lifting threaded columns are symmetrically and rotatably arranged on the lifting motors. The symmetric lifting threaded columns are respectively electrically connected with the output ends of the lifting motors. The pulling plate is meshed and sleeved on the symmetric lifting threaded columns. The bearing plate is slidably arranged inside the sewage tank. The pulling steel wire ropes are connected to the four corners of the bearing plate. Pressure bearing rods are symmetrically and rotatably arranged on the upper wall of the sewage tank. The pulling steel wire ropes bypass the pressure bearing rods and are connected with the pulling plate.

3. The sewage treatment equipment for construction engineering according to claim 2, characterized in that: Positioning columns are vertically and symmetrically arranged at one end of the bearing plate close to the transition connecting block. The two ends of the floating plate are respectively slidably sleeved on the symmetric positioning columns; A scraping strip is coated on the upper edge of the bearing plate.

4. A sewage treatment device for construction engineering according to claim 3, characterized in that: A transition channel is arranged inside the transition connecting block. The transition channel is communicated between the sedimentation tank and the output end of the water pump. A drain port is arranged through the lower part of one side of the sedimentation tank far away from the transition channel; On the inner side walls of the sedimentation tank, a first sieve filter tank, a second sieve filter tank and a detection tank are respectively provided. The first sieve filter tank is inclined, and the second sieve filter tank is vertical. There are two first sieve filter tanks and two second sieve filter tanks arranged side by side respectively. The first sieve filter screen is slidably arranged in the first sieve filter tank, and the second sieve filter screen is slidably arranged in the second sieve filter tank; The detection tank is vertically arranged above the first sieve filter tank, and a detection floating plate is slidably arranged in the detection tank, and sensors are arranged at both ends of the detection floating plate.

5. The sewage treatment equipment for construction engineering according to claim 4, wherein: The stirring and spraying mechanism further includes a spraying tank, which is arranged on the side wall of the sedimentation tank. A stirring motor is embedded in the spraying tank. One side of the stirring shaft is connected to the output end of the stirring motor. A liquid extraction pump is embedded in the liquid spraying plate. Liquid spraying ports are evenly distributed on the stirring rod. The water inlet of the liquid extraction pump is communicated with the spraying tank, and the water outlet of the liquid extraction pump is communicated with the liquid spraying ports. The stirring rod moves between the detection floating plate and the inner wall of the sedimentation tank.

6. The sewage treatment equipment for construction engineering according to claim 5, characterized in that: The air flotation oil removal mechanism further includes an air pump, which is embedded on the rotating disk. Ventilation holes are evenly distributed on the rotating rod, and the output end of the air pump is communicated with the ventilation holes.

7. The sewage treatment equipment for construction engineering according to claim 6, characterized in that: A miscellaneous collection basket is slidably embedded on the bottom wall of the sedimentation tank, and the miscellaneous collection basket slides between the lower end of the first sieve filter screen and the inner wall of the sedimentation tank.

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