Secondary sedimentation tank for sewage treatment

Abstract

The utility model discloses a secondary sedimentation tank for sewage treatment, which relates to the technical field of sewage treatment and comprises an outer tank body, a support plate connected with a baffle, an inner tank body provided with an overflow port, a filter frame connected with a movable rod, a threaded rod connected with a sliding rod and a threaded sleeve, a worm connected with a worm gear, a connecting rod connected with a spring and the inner tank body connected with a mud pumping component. Most scum is located between the baffles, the rest scum is located on the outer side, liquid flows below the baffles, passes through the overflow ports and then is discharged from the water outlet pipe, and the scum is collected by the filter frame; the double-end motor is started to enable the sliding rod to be separated from the mounting groove, the filter frame to be replaced is placed on the supporting seat and pushed, the filter frame with scum is extruded and replaced, the double-end motor is started to enable the sliding rod to restore to the original position, replacement is completed, and the sludge pumping assembly is started to clean the scum or sludge; the problems that a scum collecting structure rotates to accelerate the water surface to drive scum to flow, water flow is unstable, part of scum is discharged, and the sewage treatment effect is poor are solved.

Description

Technical Field

[0001] The utility model relates to the technical field of sewage treatment, in particular to a secondary sedimentation tank for sewage treatment. Background Technique

[0002] Sewage treatment refers to the process of purifying sewage through various technical means to meet certain water quality requirements so that it can be discharged into water bodies or reused. The sedimentation tank after biological treatment is usually called a secondary sedimentation tank. The secondary sedimentation tank plays an important role in the separation of mud and water in the sewage treatment plant. When the sewage treatment plant operates, it will cause scum to be generated in the secondary sedimentation tank. The scum mainly comes from the scum in the biochemical system and the scum generated by the floating of the activated sludge in the secondary sedimentation tank after nitrification.

[0003] Chinese Patent CN218076536U discloses a scum cleaning device for a sewage treatment secondary sedimentation tank, which includes a tank body, a bridge, a rotating structure and a scum collection structure. The rotating structure is arranged in the tank body, the bridge is arranged on the tank body and is connected to the rotating structure, and the scum collection structure is arranged on the rotating structure. The scum collection structure is symmetrically arranged on the upper connecting arm and includes a collection box, a movable front cover, a driving structure and a connecting structure. The connecting structure is arranged on the top of the collection box and is connected to the upper connecting arm, and the movable front cover is connected to the collection box through the driving structure. The utility model sets a scum collection structure to automatically collect the scum on the water surface, adopts a filtering collection method, overcomes the defects of poor collection effect of the baffle type structure and the need for manual cooperation; sets a movable front cover that automatically opens and closes to ensure the collection effect of the scum and avoid the problem of scum overflow.

[0004] In the above patent, during the process of collecting the scum on the water surface, the rotation of the scum collection structure will accelerate the flow of the water surface driving the scum, resulting in unstable water flow, and some scum will be discharged with the liquid, so that the scum cannot be collected, and further resulting in poor sewage treatment effect. Content of the Utility Model

[0005] The purpose of the utility model is to provide a secondary sedimentation tank for sewage treatment to solve the problems raised in the above background technique.

[0006] To solve the above technical problems, the present utility model provides the following technical solution: A secondary sedimentation tank for sewage treatment, comprising: an outer tank body, a water outlet pipe is installed at the lower end of the outer tank body, an inner tank body is provided inside the outer tank body, a plurality of support plates are provided inside the inner tank body, baffles are installed on the top surfaces of the support plates, a plurality of overflow ports located above the water outlet pipe are opened at the upper end of the inner tank body, the overflow ports are located below the top surface of the baffle, filter frames are provided inside the overflow ports, a fixing plate located above the overflow ports is fixed on the top surface of the inner tank body, movable rods inserted into the upper plates of the filter frames are vertically slidable at both ends of the fixing plate, the outer side wall of the lower end of the movable rod is an inclined surface, a sliding rod inserted into the filter frame is vertically slidable inside the movable rod, a threaded sleeve threadedly connected to a threaded rod is vertically fixed inside the sliding rod, the threaded rod is rotatably connected to the upper end of the movable rod, a worm gear meshed with a worm is fixed at the upper end of the threaded rod, the worm is fixed to the output end of a double-headed motor, the double-headed motor is fixedly connected to a connecting rod horizontally fixed to the two movable rods, a spring vertically fixed to the top surface of the fixing plate is vertically fixed to the bottom surface of the connecting rod, and a sludge pumping assembly is connected to the inner tank body.

[0007] Further, the top surface of the outer tank body is higher than the top surface of the inner tank body, the cross section of the baffle is circular, the top surfaces of the baffle and the inner tank body are on the same plane, and the centers of the outer tank body, the baffle and the inner tank body are on the same vertical line.

[0008] Further, a support seat corresponding to the overflow port is fixed on the outer wall of the inner tank body, the cross section of the support seat is U-shaped, the support seat is located outside the overflow port, and the inner wall of the support seat is flush with the edge of the overflow port.

[0009] Further, installation grooves for movably connecting with the movable rods are opened at both ends of the upper plate of the filter frame, the cross section of the movable rod is a right-angled pentagon, and the end angles of the installation groove are slidably connected to the inclined surface at the lower end of the movable rod.

[0010] Further, a sliding groove for slidably connecting with the sliding rod is vertically opened on one side of the movable rod close to the inclined surface of the movable rod, a limiting groove for slidably connecting with a limiting block is vertically opened inside the movable rod, the limiting groove communicates with the sliding groove, and the limiting block is fixed to the upper side wall of the sliding rod.

[0011] Further, the two ends of the connecting rod are respectively fixed to the upper side walls of the two movable rods, connecting plates are fixed to the top surfaces of the movable rods, and one end of the connecting plate is rotatably connected to the worm.

[0012] Further, the sludge pumping assembly includes a sludge pumping pipe fixed to the lower end of the inner tank body, a branch pipe fixed to the upper end of the baffle is penetrated on the sludge pumping pipe, a valve is provided on the branch pipe, a valve is installed at one end of the sludge pumping pipe close to the suction port, the sludge pumping pipe passes through the outer tank body and is connected to the suction end of a sludge pump, and a sludge discharge pipe is installed at the sludge discharge end of the sludge pump.

[0013] Compared with the prior art, the beneficial effects achieved by the present utility model are:

[0014] 1. In the present utility model, most of the scum generated by the floating of nitrified sludge in the inner tank body is located between the baffles, and a small part is located between the inner tank body and the baffles. The liquid between the baffles flows from below the baffles to between the inner tank body and the baffles. After passing through the overflow port, the liquid enters between the outer tank body and the inner tank body, and then is discharged from the water outlet pipe. The liquid drives the scum between the inner tank body and the baffles, and the scum is filtered and collected by the filter frame. When the filter frame needs to be replaced, the double-headed motor is started to drive the worm, so that the worm gear drives the threaded rod to rotate. The threaded rod makes the sliding rod slide upward to the maximum extent in the chute through the threaded sleeve. Then, the filter frame to be replaced is placed on the support seat, and the filter frame to be replaced is horizontally pushed. At the same time, hold the filter frame with scum. This filter frame pushes the filter frame on the inner tank body to move horizontally, so that the end corner of the installation groove contacts the inclined surface at the lower end of the movable rod, and the movable rod moves upward and slides on the fixed plate. The movable rod stretches the spring through the connecting rod. When the lower end of the movable rod slides out of the installation groove and the top surface of the filter frame, when the lower end of the movable rod encounters the upper installation groove of the filter frame to be replaced, under the action of the spring, the movable rod inserts into the installation groove. Then, the double-headed motor is started again to make the sliding rod move down to the maximum position, realizing the horizontal fixation of the filter frame and achieving the replacement of the filter frame; it solves the problem that during the process of collecting the scum on the water surface, the rotation of the scum collection structure will accelerate the flow of the water surface driving the scum, causing the water flow to be unstable, and part of the scum will be discharged with the liquid, resulting in the scum not being collected, and further leading to poor sewage treatment effect;

[0015] 2. Through the setting of the support seat in the present utility model, the filter frame to be replaced can be aligned with the overflow port, which can save effort. Pushing one filter frame drives the other filter frame to move, preventing scum from passing through the overflow port during the replacement process; by controlling the valves on the sludge suction pipe and the branch pipe, and then starting the sludge suction pump, the sludge suction pump can discharge the sludge at the bottom of the inner tank body or the scum between the baffles from the sludge discharge pipe, discharging the sludge and scum, and realizing the cleaning of the sludge and scum. Description of the Drawings

[0016] The drawings are used to provide further understanding of the present utility model, and constitute a part of the specification. Together with the embodiments of the present utility model, they are used to explain the present utility model, and do not constitute a limitation to the present utility model. In the drawings:

[0017] Figure 1 is a top view schematic diagram of the structure of the present utility model;

[0018] Figure 2 is a connection schematic diagram of the movable rod and the filter frame of the present utility model;

[0019] Figure 3 is a top view schematic diagram of the structure on the fixed plate of the present utility model;

[0020] Figure 4 is a schematic enlarged view of the structure of area A in the present utility model Figure 3 ;

[0021] Figure 5 is a schematic view of the connection structure of the movable rod and the sliding rod of the present utility model

[0022] Figure 6 is the present utility model Figure 5 schematic enlarged view of the structure of area B in

[0023] In the figure: 1, outer pool body; 2, inner pool body; 3, water outlet pipe; 4, overflow port; 5, support seat; 6, filter frame; 7, fixed plate; 8, sludge pumping assembly; 801, sludge pumping pipe; 802, sludge pumping pump; 803, sludge discharge pipe; 804, branch pipe; 9, installation groove; 10, movable rod; 11, connecting rod; 12, double-headed motor; 13, worm; 14, spring; 15, connecting plate; 16, worm gear; 17, threaded rod; 18, chute; 19, sliding rod; 20, limiting groove; 21, limiting block; 22, threaded sleeve; 23, baffle; 24, support plate. Specific embodiments

[0024] Next, the technical solutions in the embodiments of the present utility model will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present utility model. Obviously, the described embodiments are only a part of the embodiments of the present utility model, rather than all the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present utility model without creative efforts shall fall within the protection scope of the present utility model.

[0025] Please refer to Figures 1 - 6, the present utility model provides a technical solution: a secondary sedimentation tank for sewage treatment, comprising: an outer tank body 1, a water outlet pipe 3 is installed at the lower end of the outer tank body 1, an inner tank body 2 is arranged inside the outer tank body 1, a plurality of support plates 24 are arranged inside the inner tank body 2, a baffle 23 is installed on the top surface of the support plate 24, the top surface of the outer tank body 1 is higher than the top surface of the inner tank body 2, the cross section of the baffle 23 is circular, and the top surfaces of the baffle 23 and the inner tank body 2 are on the same plane. The centers of the outer tank body 1, the baffle 23 and the inner tank body 2 are on the same vertical line. A plurality of overflow ports 4 are opened at the upper end of the inner tank body 2 above the water outlet pipe 3. The water outlet pipe 3 is located below the overflow ports 4, which can prevent the liquid between the outer tank body 1 and the inner tank body 2 from flowing back into the inner tank body 2 through the overflow ports 4. The overflow ports 4 are located below the top surface of the baffle 23, and the bottom surface of the baffle 23 is located below the overflow ports 4. The baffle 23 can effectively block part of the floating sludge, so that the floating sludge is located between the baffles 23, preventing the sludge at this place from flowing out through the overflow ports 4. The water flow passes through the lower part of the baffle 23, which can improve the uniformity and stability of the water flow. A support seat 5 corresponding to the overflow port 4 is fixed on the outer wall of the inner tank body 2. The cross section of the support seat 5 is U-shaped. The support seat 5 is located outside the overflow port 4, and the inner wall of the support seat 5 is flush with the edge of the overflow port 4. The support seat 5 is used to support the filter frame 6 to be replaced, and at the same time, the filter frame 6 can be made to correspond to the overflow port 4. A filter frame 6 is arranged in the overflow port 4,The filter box 6 can collect the scum between the baffle 23 and the inner pool body 2. A fixed plate 7 is fixed on the top surface of the inner pool body 2 and is located above the overflow port 4. Two movable rods 10 which are vertically slidable at both ends of the fixed plate 7 are inserted into the upper plate of the filter box 6. The outer side wall of the lower end of the movable rod 10 is an inclined surface. A sliding rod 19 which is vertically slidable in the movable rod 10 and is inserted into the filter box 6 is provided. Installation grooves 9 which are movably connected to the movable rods 10 are respectively arranged at both ends of the upper plate of the filter box 6. The cross section of the movable rod 10 is a right-angled pentagon. The end angles of the installation groove 9 are slidably connected to the inclined surface at the lower end of the movable rod 10. A threaded sleeve 22 which is threadedly connected to the threaded rod 17 is vertically fixed in the sliding rod 19. A sliding groove 18 which is slidably connected to the sliding rod 19 is vertically arranged on one side of the movable rod 10 close to the inclined surface of the movable rod 10. A limiting groove 20 which is slidably connected to the limiting block 21 is vertically arranged in the movable rod 10. The limiting groove 20 communicates with the sliding groove 18. The limiting block 21 is fixed to the upper side wall of the sliding rod 19. The limiting block 21 and the limiting groove 20 can control the position of the sliding rod 19 and the positional relationship between the sliding rod 19 and the inclined surface at the lower end of the movable rod 10. The threaded rod 17 is rotatably connected to the upper end of the movable rod 10. A worm gear 16 which is meshed with the worm 13 is fixed to the upper end of the threaded rod 17 and is located above the movable rod 10. The worm 13 is fixed to the output end of the double-headed motor 12. The double-headed motor 12 is fixedly connected with a connecting rod 11 which is horizontally fixed to the two movable rods 10. The two ends of the connecting rod 11 are respectively fixed to the upper side walls of the two movable rods 10. A connecting plate 15 is fixed to the top surface of each movable rod 10. One end of the connecting plate 15 is rotatably connected to the worm 13. A spring 14 which is fixed to the top surface of the fixed plate 7 is vertically fixed to the bottom surface of the connecting rod 11. The inner pool body 2 is connected with a sludge pumping assembly 8. The sludge pumping assembly 8 includes a sludge pumping pipe 801 which is fixed to the lower end of the inner pool body 2. A branch pipe 804 which is fixed to the upper end of the baffle 23 penetrates through the sludge pumping pipe 801. A valve is arranged on the branch pipe 804. A valve is installed at one end of the sludge pumping pipe 801 close to the suction port. The sludge pumping pipe 801 passes through the outer pool body 1 and is connected to the suction end of the sludge pump 802. A sludge discharging pipe 803 is installed at the sludge discharging end of the sludge pump 802. The sludge pumping assembly 8 can clean the sediment in the inner pool body 2. By opening the valve on the branch pipe 804 and closing the valve on the sludge pumping pipe 801, the floating sludge in the baffle 23 can be cleaned to ensure the water quality of the effluent.,

[0026] The working principle of the present utility model:

[0027] Refer to the attached drawings of the specification Figures 1 - 6, most of the scum generated by the floating of the nitrified sludge in the inner tank body 2 is located between the baffles 23, and a small part is located between the inner tank body 2 and the baffle 23. The liquid between the baffles 23 flows from below the baffle 23 to the space between the inner tank body 2 and the baffle 23, which can improve the stability of the water flow and also block most of the scum between the baffles 23. The liquid enters the space between the outer tank body 1 and the inner tank body 2 after passing through the overflow port 4, and then is discharged from the water outlet pipe 3. The liquid drives the scum between the inner tank body 2 and the baffle 23, so that the scum is filtered and collected by the filter frame 6, thus realizing the treatment of sewage. When the filter frame 6 collects a certain amount of scum, it needs to be replaced. First, start the double-headed motor 12. The output end of the double-headed motor 12 drives the worm 13 to rotate on the connecting plate 15. The worm 13 drives the worm gear 16 to make the threaded rod 17 rotate on the movable rod 10. The threaded rod 17 makes the sliding rod 19 slide upward in the sliding groove 18 through the threaded sleeve 22. The sliding rod 19 drives the limit block 21 to slide to the maximum extent in the limit groove 20. At this time, the lower end of the sliding rod 19 is above the inclined surface at the lower end of the movable rod 10. Then, place the filter frame 6 to be replaced on the support seat 5, and horizontally push the filter frame 6 to be replaced. At the same time, hold the filter frame 6 with scum. The filter frame 6 pushes the filter frame 6 on the inner tank body 2 to move horizontally, so that the end angle of the installation groove 9 contacts the inclined surface at the lower end of the movable rod 10, and the movable rod 10 moves upward and slides on the fixed plate 7. The movable rod 10 stretches the spring 14 through the connecting rod 11. When the lower end of the movable rod 10 slides out of the installation groove 9 and the top surface of the filter frame 6, when the lower end of the movable rod 10 encounters the upper installation groove 9 of the filter frame 6 to be replaced, under the action of the spring 14, the movable rod 10 inserts into the installation groove 9. Then, start the double-headed motor 12 again to make the sliding rod 19 move down to the maximum position, that is, the sliding rod 19 inserts into the installation groove 9, realizing the horizontal fixation of the filter frame 6, and thus realizing the replacement of the filter frame 6; by controlling the valves on the sludge suction pipe 801 and the branch pipe 804, and then starting the sludge suction pump 802, the sludge suction pump 802 can discharge the sludge at the bottom of the inner tank body 2 or the scum between the baffles 23 from the sludge discharge pipe 803, discharging the sludge; it solves the problem that during the process of collecting the scum on the water surface, the rotation of the scum collection structure will accelerate the flow of the water surface driving the scum, resulting in unstable water flow, and part of the scum will be discharged with the liquid, so that the scum cannot be collected, and further resulting in poor sewage treatment effect.

[0028] Finally, it should be noted that the above are only the preferred embodiments of the present invention and are not used to limit the present invention. Although the present invention has been described in detail with reference to the foregoing embodiments, for those skilled in the art, they can still modify the technical solutions recorded in the foregoing embodiments, or perform equivalent replacements on some of the technical features. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A secondary sedimentation tank for sewage treatment, comprising: Outer pool body (1), characterized in that: a water outlet pipe (3) is installed at the lower end of the outer pool body (1), an inner pool body (2) is arranged inside the outer pool body (1), a plurality of support plates (24) are arranged inside the inner pool body (2), a baffle (23) is installed on the top surface of the support plate (24), a plurality of overflow ports (4) located above the water outlet pipe (3) are opened at the upper end of the inner pool body (2), the overflow ports (4) are located below the top surface of the baffle (23), a filter frame (6) is arranged inside the overflow ports (4), a fixing plate (7) located above the overflow ports (4) is fixed on the top surface of the inner pool body (2), movable rods (10) vertically sliding at both ends of the fixing plate (7) are inserted into the upper plate of the filter frame (6), the outer side wall of the lower end of the movable rod (10) is an inclined surface, a sliding rod (19) inserted into the filter frame (6) vertically slides inside the movable rod (10), a threaded sleeve (22) vertically fixed inside the sliding rod (19) and threadedly connected with a threaded rod (17) is arranged, the threaded rod (17) is rotatably connected with the upper end of the movable rod (10), a worm gear (16) located above the movable rod (10) and meshed with a worm (13) is fixed at the upper end of the threaded rod (17), the worm (13) is fixed to the output end of a double-headed motor (12), the double-headed motor (12) is fixedly connected with a connecting rod (11) horizontally fixed to the two movable rods (10), a spring (14) vertically fixed to the bottom surface of the connecting rod (11) and fixed to the top surface of the fixing plate (7) is arranged, and the inner pool body (2) is connected with a sludge pumping assembly (8).

2. The secondary sedimentation tank for sewage treatment according to claim 1, characterized in that: The top surface of the outer pool body (1) is higher than the top surface of the inner pool body (2), the cross section of the baffle (23) is circular ring-shaped, the top surfaces of the baffle (23) and the inner pool body (2) are located on the same plane, and the centers of the outer pool body (1), the baffle (23) and the inner pool body (2) are located on the same vertical line.

3. The secondary sedimentation tank for sewage treatment according to claim 1, wherein: A support seat (5) corresponding to the overflow port (4) is fixed on the outer wall of the inner pool body (2), the cross section of the support seat (5) is U-shaped, the support seat (5) is located outside the overflow port (4), and the inner wall of the support seat (5) is flush with the edge of the overflow port (4).

4. A secondary sedimentation tank for sewage treatment according to claim 1, characterized in that: Installation grooves (9) for movably connecting with the movable rods (10) are opened at both ends of the upper plate of the filter frame (6), the cross section of the movable rod (10) is a right-angled pentagon, and the end angle of the installation groove (9) is slidably connected with the inclined surface at the lower end of the movable rod (10).

5. The secondary sedimentation tank for sewage treatment according to claim 1, wherein: A sliding groove (18) for slidably connecting with the sliding rod (19) is vertically opened on one side of the movable rod (10) close to the inclined surface of the movable rod (10), a limiting groove (20) for slidably connecting with a limiting block (21) is vertically opened inside the movable rod (10), the limiting groove (20) communicates with the sliding groove (18), and the limiting block (21) is fixed to the upper side wall of the sliding rod (19).

6. The secondary sedimentation tank for sewage treatment according to claim 1, wherein: Both ends of the connecting rod (11) are respectively fixed to the upper side walls of the two movable rods (10), connecting plates (15) are fixed to the top surfaces of the movable rods (10), and one end of the connecting plate (15) is rotatably connected with the worm (13).

7. A secondary sedimentation tank for sewage treatment according to claim 1, characterized in that: The sludge pumping assembly (8) includes a sludge pumping pipe (801) fixed to the lower end of the inner tank body (2). A branch pipe (804) fixed to the upper end of the baffle plate (23) penetrates through the sludge pumping pipe (801). A valve is provided on the branch pipe (804). A valve is installed at one end of the sludge pumping pipe (801) close to the suction port. The sludge pumping pipe (801) passes through the outer tank body (1) and is connected to the suction end of the sludge pump (802). A sludge discharge pipe (803) is installed at the sludge discharge end of the sludge pump (802).

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