A sewage treatment composite grid device

Abstract

This utility model relates to the field of wastewater treatment technology, specifically to a composite screen device for wastewater treatment, comprising a housing and multiple screens. Multiple screens are arranged from top to bottom within the housing, with the aperture of each screen gradually decreasing from top to bottom. Each screen is arranged at an angle, and a scraper is positioned above each screen. The scraper engages with the screen surface during upward movement and disengages from the screen surface during downward movement. The higher side of the screen is the impurity outlet side, and a collection trough is positioned below the impurity outlet side, extending to the outside of the housing. A nozzle is positioned above the collection trough, engaging with the scraper. This utility model enables further treatment of wastewater influent to wastewater treatment plants, effectively reducing the impurity content in the influent and playing a positive role in ensuring the stable operation of downstream processes. Furthermore, this utility model has a simple structure, low manufacturing cost, and is easy to promote and use in wastewater treatment.

Description

Technical Field

[0001] This utility model relates to the field of wastewater treatment technology, specifically to a composite bar screen device for wastewater treatment. Background Technology

[0002] Wastewater from people's production and daily life is generally treated in sewage treatment plants to achieve water purification and recycling, which plays a positive role in water conservation, recycling and environmental protection.

[0003] Because wastewater contains a lot of impurities and silt, it is necessary to filter the influent to the plant in order to ensure the stable operation of the wastewater treatment system. Traditional filtration includes coarse screens and fine screens. Filtration can effectively remove most of the impurities in the influent. After further treatment by subsequent primary sedimentation tanks, the stability of the influent to the downstream biological tank can be basically guaranteed.

[0004] While the above process can basically ensure the stability of the downstream biological tank, in actual production, the primary sedimentation tank often becomes overloaded due to excessive impurities, leading to tank shutdowns and affecting the stable operation of the system. Further filtration and impurity removal at the front end is an effective technical means, but if traditional fine screens are used, it will increase the footprint and be inconvenient to install. At the same time, the increased equipment and installation costs brought by multiple fine screens cannot be ignored. How to further treat the influent in a simple, effective, and economical way is an urgent problem to be solved.

[0005] Therefore, this utility model proposes a composite screen device for sewage treatment, which uses multiple screens with different apertures to further treat the incoming water to the plant. At the same time, the structure is simpler, the manufacturing cost is lower, the disassembly and maintenance are more convenient, and it is more convenient to use in actual production. Utility Model Content

[0006] The purpose of this invention is to address the shortcomings of the existing technology by providing a composite bar screen device for wastewater treatment, so as to achieve further treatment of the influent to wastewater treatment plants.

[0007] To achieve the above objectives, the present invention adopts the following technical solution: a composite bar screen device for sewage treatment, comprising a box body, wherein a screen is provided in the box body and the screen is arranged at an inclination; one side of the box body above the screen is matched with an inlet channel, and one side of the box body below the screen is matched with an outlet channel; a scraper is provided above the screen body and the scraper is connected to a drive mechanism. The screens are arranged in multiple stages from top to bottom in the housing, with the aperture of each stage gradually decreasing from top to bottom; each stage of the screen is matched with a corresponding scraper. The driving mechanism includes a drive motor, which is connected to a reciprocating lead screw. A connecting block is provided on the reciprocating lead screw. A guide rod is horizontally arranged in the housing, parallel to the reciprocating lead screw, and a slider is sleeved on the guide rod. A connecting rod is connected to the connecting block and the slider. A collar is connected above the scraper, and the collar is sleeved on the connecting rod. A limit groove is provided on the collar along the rotation direction of the collar, and a limit post is provided in the limit groove. The limit post is fixedly connected to the connecting rod. When the limit post engages with the lower side of the limit groove, the scraper contacts the surface of the screen. When the limit post engages with the upper side of the limit groove, the scraper disengages from the surface of the screen. The side with the higher edge of each screen is the impurity outlet side. A collection trough is set below the impurity outlet side and extends to the outside of the box.

[0008] Furthermore, the screen is arranged in multiple stages from top to bottom in the box, and the aperture of the multiple stages of screen gradually decreases from top to bottom.

[0009] Furthermore, the screen is detachably connected to the box body, and the connection between the screen and the box body is sealed.

[0010] Furthermore, the box body is provided with slots; a frame is provided around the perimeter of the screen outlet side where impurities are removed, the frame is fixedly connected to the screen, the frame on the front side of the screen is connected to a push-pull plate, and a handle is provided on the push-pull plate; a slot is provided on the inner wall of the box body to cooperate with the frame, a rubber layer is provided on both the upper and lower sides of the frame, and a rubber layer is also provided at the joint between the side of the frame on the front side of the screen and the box body.

[0011] Furthermore, the bottom of the box is provided with a connecting port, which is connected to the water outlet tank. An overflow port is provided on one side of the water outlet tank, and the other side of the overflow port is connected to the water outlet channel.

[0012] Furthermore, a delivery pump is installed on the side wall of the housing, and the delivery pump is installed in a one-to-one correspondence with the screen; the water inlet pipe of the delivery pump extends into the water outlet tank, and a filter screen is installed at the inlet of the water inlet pipe; the water outlet pipe of the delivery pump extends into the housing and is connected to the nozzle, and the nozzle cooperates with the scraper.

[0013] Furthermore, a limit switch is installed on the inner wall of the box, the limit switch is corresponding to each level of screen and cooperates with the connecting rod; the limit switch is connected to the local PLC, and the local PLC is connected to the delivery pump.

[0014] Furthermore, the outside of the box is provided with a collecting hopper, the collecting trough extends to the outside of the box and is connected to the drain pipe, and the drain pipe extends to the top of the collecting hopper; the discharge port of the collecting hopper is connected to the screw press.

[0015] The beneficial effects of this utility model are: 1. This utility model can further treat the influent of sewage treatment plants, thereby effectively reducing the content of impurities in the influent and playing a positive role in ensuring the stable operation of downstream processes. 2. This utility model has a simple structure, low manufacturing cost, and good promotional value; 3. The screen plates of this utility model are easy to disassemble, and the disassembly process does not affect the stable water intake, making it more convenient to use; 4. This utility model ingeniously utilizes the water resistance during the reciprocating process of the scraper to change the scraper's operating state, thereby achieving the removal of impurities while avoiding reverse scraping. Furthermore, a water outlet is provided, and the water outlet is used to rinse the scraper, which can effectively ensure the scraping effect. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the main view of this utility model; Figure 2 This is a schematic diagram of the main sectional view of this utility model; Figure 3 This is a top view of the present invention; Figure 4 This is a schematic diagram of the sieve plate structure of this utility model; Figure 5 This is a schematic diagram of the scraper structure of this utility model.

[0017] The names corresponding to each mark in the diagram: 1. Housing; 11. Screen plate; 111. Push-pull plate; 112. Screen mesh; 113. Rubber layer; 114. Handle; 12. Slot; 13. Drive mechanism; 131. Drive motor; 132. Reciprocating screw; 133. Guide rod; 134. Connecting rod; 14. Collection trough; 15. Limit switch; 16. Conveying pump; 17. Nozzle; 18. Collection hopper; 19. Scraper; 191. Collar; 192. Limiting groove; 193. Limiting post; 2. Inlet channel; 3. Outlet channel; 31. Overflow port; 4. Outlet channel. Detailed Implementation

[0018] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present utility model. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of the present utility model are within the protection scope of the present utility model.

[0019] Embodiments of this utility model: like Figure 1-5As shown, in this embodiment, a housing 1 is provided, with three slots arranged from top to bottom on the housing 1. Screen plates 11 are respectively inserted and installed through these slots. The aperture of the screen mesh 112 in the screen plate 11 gradually decreases from top to bottom; for example, the aperture of the screen mesh 112 in the uppermost screen plate 11 is 6mm, the aperture of the screen mesh 112 in the middle screen plate 11 is 4mm, and the aperture of the screen mesh 112 in the lower screen plate 11 is 2mm, etc. A slot 12 is provided around the inside of the housing 1, which cooperates with the periphery of the screen plate 11 (the slot 12 has a retaining plate on both the upper and lower sides of the screen plate 11, clamping the screen plate 11). A push-pull plate 111 is provided at the front end of the sieve plate 11 (set between two plates), and multiple handles 114 are arranged at intervals on the push-pull plate 111. The push-pull plate 111 is connected to the screen 112 at the rear. The remaining perimeter of the screen 112, excluding the outlet of the filtered impurities, is provided with a frame. The slot 12 cooperates with the frame. Rubber layers 113 are provided on the upper and lower sides of the frame. Rubber layers 113 are also provided on the side of the frame near the outlet of the filtered impurities that cooperates with the slot. The rubber layers 113 ensure a sealed connection between the sieve plate 11 and the housing 1.

[0020] A water inlet channel 2 is provided on the upper side of one side of the tank 1. Water enters the tank 1 through the water inlet channel 2 and is filtered by the three sieve plates 11 mentioned above. Then, it flows from the connection port at the bottom of the tank 1 to the water outlet channel 3. In the water outlet channel 3, it overflows through the overflow port 31 into the water outlet channel 4, and then enters the factory area for treatment.

[0021] The three sieve plates 11 in the housing 1 are all arranged at an angle, with the side for filtering impurities positioned higher. Each sieve plate 11 is equipped with a scraper 19, which cooperates with a drive mechanism 13. The drive mechanism 13 includes a drive motor 131 fixedly mounted on one side of the housing 1, which is connected to a reciprocating lead screw 132. The other end of the reciprocating lead screw 132 is supported on the housing 1, and a connecting block is provided on the reciprocating lead screw 132 to cooperate with it. A guide rod 133 is also arranged parallel to the reciprocating lead screw 132 on the housing 1, and a slider is sleeved on the guide rod 133. A connecting rod 134 is connected to the slider via the connecting block, and the scraper 19 is rotatably mounted below the connecting rod 134. Multiple sleeves are connected above the scraper 19. A ring 191 is sleeved on a connecting rod 134. A limiting groove 192 is provided on the ring 191 along the rotation direction of the ring 191. A limiting post 193 is provided in the limiting groove 192. The limiting post 193 is fixedly connected to the connecting rod 134. During the rotation of the scraper 19, when the limiting post 193 contacts the upper and lower sides of the limiting groove 192 respectively, the rotation of the scraper 19 is limited. During the upward movement of the scraper 19, due to the effects of water resistance, its own weight, inertia, etc., the scraper 19 cooperates with the surface of the screen 112 to scrape off impurities from the surface of the screen 112. During the downward movement of the scraper 19, due to the effects of water resistance and inertia, the scraper 19 rotates upward and separates from the surface of the screen 112 to avoid scraping the filtered impurities in the opposite direction.

[0022] On one side of the impurity outlet on the screen 112, a certain gap is provided between the screen 112 and the inner wall of the box 1. When the scraper 19 scrapes to this gap, the impurities on the scraper 19 fall into the collection trough 14 below the gap. Then the scraper 19 runs to the end of the stroke of the reciprocating screw 132 and automatically reverses. During this process, a limit switch 15 is provided on the inner wall of the box 1. The limit switch 15 cooperates with the connecting rod 134. A conveying pump 16 is provided on the outer wall of the box 1. There are three conveying pumps 16, each corresponding to one of the three scrapers 19. The water inlet pipe of the conveying pump 16 extends into the water outlet trough 3. A filter screen is provided at the water inlet of the water inlet pipe. Water pipes extend to the corresponding scrapers 19 and connect to the nozzles 17. The nozzles 17 cooperate with the scrapers 19. When the scraper 19 moves upward, the connecting rod 134 touches the limit switch 15 (the roller on the limit switch 15 touches the connecting rod 134). The limit switch 15 transmits a signal to the local PLC. When the corresponding limit switch 15 transmits a signal to the local PLC, the local PLC controls the corresponding delivery pump 16 to operate. The nozzles 17 spray water to rinse the scrapers 19, so that the impurities on the scrapers 19 are washed into the collection tank 14. When the scraper 19 moves downward, the connecting rod 134 touches the limit switch 15 again, and the local PLC controls the corresponding delivery pump 16 to stop working.

[0023] The mixture of impurities and water in the collection tank 14 flows to the outside of the box 1 and is collected in the collection hopper 18 through the corresponding drain pipe. The collection hopper 18 is used in conjunction with the screw press to press and dehydrate the collected impurities.

[0024] The principle of this utility model is as follows: In use, this utility model is installed behind the fine screen in a sewage treatment plant. The device further treats the sewage after it has been treated by the fine screen, thereby further reducing impurities in the sewage. It should be noted that the aperture of each screen 112 in this utility model is not larger than the aperture of the fine screen. The screens need to be arranged reasonably according to the aperture of the fine screen in the actual sewage treatment plant. For example, if the aperture of the fine screen is 10mm, the aperture of each screen 112 in the above embodiment can be used.

[0025] In the process of further treating sewage in this utility model, it is necessary to control the corresponding influent flow rate so that the water is enriched to a certain height on each screen plate 11 and avoids touching the upper screen plate 11 and short-flowing out from the impurity outlet side. Therefore, during the upward movement of the scraper 19, it can fit with the screen 112 under the action of water resistance, thereby removing the filtered impurities. When the scraper 19 moves downward, it rotates and lifts under the action of water resistance, thereby avoiding the reverse scraping of impurities.

[0026] When the scraped impurities reach the impurity outlet side of the screen 112, they can be washed away by the nozzle 17. The process involves simple on-site PLC control, which will not be described in detail. In addition, the rinsing water of the nozzle 17 uses water from the outlet tank 3, which is more convenient and further filtered. For example, the pore size of the filter screen is set to 0.3mm, which further ensures the stability of the nozzle 17. The water collection tank also plays a role in settling and further removing impurities such as mud and sand. Large particles of mud and sand can be manually cleaned regularly.

[0027] When the screen plate 11 needs maintenance, on-site workers can cooperate to pull out the screen plate 11 using handle 114, and insert the screen plate 11 into the slot after maintenance or replacement. During the process, certain auxiliary tools, such as wooden mallets, can be used as needed. When maintaining or replacing the screen plate 11, disassembling any one of the screen plates 11 will not affect the stable water intake (the water volume can be adjusted appropriately to prevent water from overflowing from the slot), nor will it affect the stable operation of the sewage treatment.

Claims

1. A sewage treatment composite grid device, characterized by: The device includes a housing, in which a screen is installed at an angle; one side of the housing above the screen is connected to an inlet channel, and one side of the housing below the screen is connected to an outlet channel; a scraper is installed above the screen and is connected to a drive mechanism. The screens are arranged in multiple stages from top to bottom in the housing, with the aperture of each stage gradually decreasing from top to bottom; each stage of the screen is matched with a corresponding scraper. The driving mechanism includes a drive motor, which is connected to a reciprocating lead screw. A connecting block is provided on the reciprocating lead screw. A guide rod is horizontally arranged in the housing, parallel to the reciprocating lead screw, and a slider is sleeved on the guide rod. A connecting rod is connected to the connecting block and the slider. A collar is connected above the scraper, and the collar is sleeved on the connecting rod. A limit groove is provided on the collar along the rotation direction of the collar, and a limit post is provided in the limit groove. The limit post is fixedly connected to the connecting rod. When the limit post engages with the lower side of the limit groove, the scraper contacts the surface of the screen. When the limit post engages with the upper side of the limit groove, the scraper disengages from the surface of the screen. The side with the higher edge of each screen is the impurity outlet side. A collection trough is set below the impurity outlet side and extends to the outside of the box.

2. A combined sewage treatment grid device according to claim 1, characterized in that: The screen and the box are detachably connected, and the connection between the screen and the box is sealed.

3. The wastewater treatment composite bar device according to claim 2, characterized in that: The box body is provided with slots; a frame is provided around the perimeter of the screen outlet side where impurities are removed, and the frame is fixedly connected to the screen. The frame on the front side of the screen is connected to a push-pull plate, and a handle is provided on the push-pull plate; a slot is provided on the inner wall of the box body to match the frame, and a rubber layer is provided on the upper and lower sides of the frame. A rubber layer is also provided at the joint between the side of the frame on the front side of the screen and the box body.

4. The combined sewage treatment grid device according to claim 1, characterized in that: The bottom of the box is provided with a connecting port, which is connected to the water outlet tank. An overflow port is provided on one side of the water outlet tank, and the other side of the overflow port is connected to the water outlet channel.

5. A sewage treatment complex grid device according to claim 4, characterised in that: A delivery pump is installed on the side wall of the housing, and the delivery pump is installed in a one-to-one correspondence with the screen. The water inlet pipe of the delivery pump extends into the water outlet tank, and a filter screen is installed at the inlet of the water inlet pipe. The water outlet pipe of the delivery pump extends into the housing and is connected to the nozzle. The nozzle cooperates with the scraper.

6. A sewage treatment complex grid device according to claim 5, wherein: Limit switches are installed on the inner side wall of the box, and the limit switches are corresponding to each level of screen and cooperate with the connecting rod; the limit switches are connected to the local PLC, and the local PLC is connected to the conveying pump.

7. The combined sewage treatment grid device according to claim 1, characterized in that: The outer side of the box is provided with a collection hopper, the collection trough extends to the outside of the box and is connected to the drain pipe, and the drain pipe extends to the top of the collection hopper; the discharge port of the collection hopper is connected to the screw press.

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