Sedimentation basin with rotary sludge scraper

Abstract

The utility model relates to the technical field of sedimentation tank, especially is with the sedimentation tank of rotary mud scraper, including the steel structure support of fixed support in the top of sedimentation tank, the central bottom of sedimentation tank is fixedly installed with the jacking device, is equipped with vertical support in the sedimentation tank above jacking device, the bottom fixed mounting of vertical support has rotary drive part, the left and right sides of vertical support in rotary drive part upper portion are fixedly installed with passive mud scraper respectively, the inside both sides of sedimentation tank are installed with water inlet device, the bottom both sides of sedimentation tank below jacking device are provided with the sludge discharge channel of communication with outside, be provided with overflow channel of communication with outside on the upper portion lateral wall of sedimentation tank. Through the cooperation of jacking device and rotary drive part, realize the lifting and rotation of mud scraper, thereby can layer by layer feeding formula downward rotation mud scraping, effectively solve the problem that the sludge accumulation is too thick and leads to the big problem of mud scraping difficulty.

Description

Technical Field

[0001] This utility model relates to the field of sedimentation tank technology, and in particular to sedimentation tanks equipped with rotary sludge scrapers. Background Technology

[0002] Sedimentation tanks, as core equipment for solid-liquid separation in water treatment processes, are widely used in municipal sewage treatment, industrial wastewater treatment, and water supply treatment. Sedimentation tanks equipped with rotary scrapers use mechanical scraping devices to collect settled sludge to the discharge port, significantly improving sludge discharge efficiency.

[0003] However, the current sedimentation tanks still have the following drawbacks in actual operation:

[0004] First, some current sedimentation tanks use a single-point central column support for their sludge scrapers. As the scraper arm rotates continuously, the end of the arm, under long-term stress, will experience significant sagging deformation due to its excessive length. This causes changes in the distance between the scraper blade and the tank bottom, affecting the scraping effect. Furthermore, the single-point support method results in poor overall stability of the scraper. When encountering sudden increases in sludge concentration or a sharp rise in scraping resistance, it is prone to shaking or even tipping over, seriously threatening the safe operation of the equipment.

[0005] Secondly, the distance between the scraper blade and the bottom of the sedimentation tank in the sludge collection area is difficult to control precisely. For example, in the high-efficiency sedimentation tank scraper device disclosed in patent application CN202221114334.8, the scraper blade at the bottom is mainly suspended by the descaling plates on both sides. When the distance between the scraper blade and the bottom of the tank is too large, the sludge at the bottom of the tank cannot be effectively scraped off, and the residual sludge is prone to accumulate at the bottom of the tank, forming a dead zone and reducing the effective volume of the sedimentation tank. When the distance is too small, the friction between the scraper blade and the bottom of the tank intensifies, which not only accelerates the wear of the scraper blade, but also disturbs the settled sludge, causing the sludge to be resuspended, affecting the quality of the effluent and increasing the load on subsequent treatment units.

[0006] Therefore, it is necessary to design a new type of sedimentation tank with a rotary sludge scraper to effectively solve the problems existing in the current technology and improve the operational stability and treatment effect of the sedimentation tank. Utility Model Content

[0007] To solve one of the aforementioned technical problems, the present invention provides the following technical solution: a sedimentation tank with a rotary scraper, comprising a steel structure support fixedly supported at the top of the sedimentation tank, a lifter fixedly installed at the bottom center of the sedimentation tank, a vertical support provided inside the sedimentation tank above the lifter, a rotary shaft fixedly installed at the top of the vertical support, the rotary shaft being fitted into a through hole in the middle of the steel structure support, a rotary drive component fixedly installed at the bottom of the vertical support, the top of the rotary drive component being fixedly installed at the top telescopic end of the lifter, passive scrapers fixedly installed on the left and right sides of the vertical support above the rotary drive component, the gap between the bottom of the scraper and the bottom of the sedimentation tank being adjustable, water inlets installed on both sides inside the sedimentation tank, sludge discharge channels communicating with the outside being provided on both sides of the bottom of the sedimentation tank below the lifter, and an overflow channel communicating with the outside being provided on the upper side wall of the sedimentation tank.

[0008] Based on any of the above technical solutions, a further optimization is made as follows: the sludge scraper includes a rotary cantilever arranged in the radial direction of the sedimentation tank, the inner end of the rotary cantilever is fixed on the lower outer wall of the vertical support, the outer end of the rotary cantilever is arranged close to the inner wall of the sedimentation tank, and a sludge scraper is fixedly installed at the bottom of the rotary cantilever, the bottom of the sludge scraper being used to scrape off the sludge accumulated at the bottom of the sedimentation tank.

[0009] Based on any of the above technical solutions, a further optimization is made as follows: the outer bottom of the sedimentation tank is higher than the center of the sedimentation tank, and the bottom of the sludge scraper is arranged parallel to the bottom of the sedimentation tank.

[0010] Based on any of the above technical solutions, a further optimization is made as follows: the lifting device includes a heavy-duty corrosion-resistant hydraulic lifting cylinder that is fixedly embedded in the center bottom of the sedimentation tank. The top of the piston rod of the hydraulic lifting cylinder is fixed to the bottom of the vertical support. A protective cylinder is provided on the outside of the hydraulic lifting cylinder. The top sealing cap of the protective cylinder is movable through the central hole and sealed to the outer side wall of the piston rod of the hydraulic lifting cylinder.

[0011] Based on any of the above technical solutions, a further optimization is made: the rotary drive component includes a rotary bearing, and the rotary bearing adopts a corrosion-resistant single-row cross roller rotary bearing.

[0012] Based on any of the above technical solutions, a further optimization is made by providing a number of guide holes at intervals along the length of each scraper blade.

[0013] Based on any of the above technical solutions, a further optimization is made as follows: an annular support is provided in the sedimentation tank above the slewing bearing, and swing beams are symmetrically fixed on both sides of the outer side wall of the vertical support at the top of the annular support, with the bottom of the outer ends of the two swing beams abutting against the top of the annular support.

[0014] Based on any of the above technical solutions, a further optimization is made: when the swing beam rotates slowly following the vertical support, it has relative motion with the top of the annular support.

[0015] Based on any of the above technical solutions, a further optimization is made as follows: the water inlet includes a water inlet connector fixed on the swing beam, the water inlet connector is connected to an external water supply pipeline, and the lower part of the water inlet connector is inclined toward the inner wall of the sedimentation tank. When the water inlet connector supplies the water to be treated into the sedimentation tank, the water can flow downward along the inner wall of the sedimentation tank.

[0016] Based on any of the above technical solutions, a further optimization is made: the overflow channel is connected to an external overflow pipeline.

[0017] Based on any of the above technical solutions, a further optimization is made as follows: an auxiliary lifting device is symmetrically arranged above the outer end of each of the rotary cantilever arms. The auxiliary lifting device includes a winch fixedly installed on the swing beam. The bottom of the wire rope of the winch is fixed to the top of the outer end of the rotary cantilever arm at the corresponding position. The lifting speed of the wire rope is consistent with the lifting speed of the hydraulic lifting cylinder.

[0018] Compared with the prior art, the beneficial effects of this utility model are as follows:

[0019] 1. This utility model, through the cooperation of the lifting device and the rotary drive, can realize the lifting and rotation of the sludge scraper, thereby enabling it to feed and rotate downwards layer by layer to scrape sludge, effectively solving the problem of difficult sludge scraping caused by excessive sludge accumulation, and facilitating sludge discharge.

[0020] 2. The water inlet of this utility model adopts a wall-mounted downward flow method, which can reduce the disturbance of the sedimentation liquid in the sedimentation tank caused by the water flow. At the same time, the height of the water outlet is lower than that of the overflow channel, which ensures the normal overflow of the upper water liquid and creates stable hydraulic conditions for the sedimentation process.

[0021] 3. This utility model provides guide holes on the surface of the scraper blade, which allows some water to flow through and form a water passage, helping to stir the sludge and mix it with water to form a more fluid slurry. At the same time, it reduces the water resistance when the scraper blade rotates, making the scraper run more smoothly. Attached Figure Description

[0022] To more clearly illustrate the specific embodiments of this utility model or the technical solutions in the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. In all the drawings, similar elements or components are generally identified by similar reference numerals. In the drawings, the elements or components are not necessarily drawn to scale.

[0023] Figure 1 This is a schematic diagram of the internal structure of the present invention in its elevation view.

[0024] Figure 2 This is a partially enlarged structural schematic diagram of the present invention.

[0025] Figure 3 This is an enlarged structural diagram showing the relative relationship between the water inlet and the inner wall of the sedimentation tank of this utility model.

[0026] In the diagram, 1. Steel structure support; 2. Vertical support; 3. Rotary shaft; 4. Sludge discharge channel; 5. Overflow channel; 6. Rotary cantilever; 7. Sludge scraper; 8. Hydraulic lifting cylinder; 9. Protective cylinder; 10. Rotary bearing; 11. Guide hole; 12. Circular support; 13. Swing beam; 14. Water inlet connector; 15. Winch; 16. Wire rope; 17. Sedimentation tank. Detailed Implementation

[0027] The embodiments of the present utility model will now be described in detail with reference to the accompanying drawings. These embodiments are only used to more clearly illustrate the technical solution of the present utility model, and are therefore merely examples and should not be construed as limiting the scope of protection of the present utility model. The specific structure of the present utility model is as follows: Figures 1-3 As shown in the image.

[0028] Example 1: A sedimentation tank with a rotary sludge scraper includes a steel structure support 1 fixedly supported on the top of the sedimentation tank 17. A lifter is fixedly installed at the bottom center of the sedimentation tank 17. A vertical support 2 is provided inside the sedimentation tank 17 above the lifter. A rotary shaft 3 is fixedly installed on the top of the vertical support 2. The rotary shaft 3 is inserted into a through hole in the middle of the steel structure support 1. A rotary drive is fixedly installed on the bottom of the vertical support 2. The top of the rotary drive is fixed to the top telescopic end of the lifter. Passive sludge scrapers are fixedly installed on the left and right sides of the vertical support 2 above the rotary drive. The gap between the bottom of the sludge scraper and the bottom of the sedimentation tank 17 is adjustable. Water inlets are installed on both sides inside the sedimentation tank 17. Sludge discharge channels 4 communicating with the outside are provided on both sides of the bottom of the sedimentation tank 17 below the lifter. An overflow channel 5 communicating with the outside is provided on the upper side wall of the sedimentation tank 17.

[0029] Based on any of the above technical solutions, a further optimization is made as follows: the sludge scraper includes a rotary cantilever 6 arranged in the radial direction of the sedimentation tank 17, the inner end of the rotary cantilever 6 is fixed on the lower outer wall of the vertical support 2, the outer end of the rotary cantilever 6 is arranged close to the inner wall of the sedimentation tank 17, and a sludge scraper 7 is fixedly installed at the bottom of the rotary cantilever 6, the bottom of the sludge scraper 7 is used to scrape off the sludge accumulated at the bottom of the sedimentation tank 17.

[0030] The rotary cantilever 6 of the sludge scraper is arranged radially along the sedimentation tank 17, with its inner end firmly fixed to the outside of the vertical support 2. As the vertical support 2 rotates under the drive of the rotary drive component, the rotary cantilever 6 also rotates synchronously around the center of the tank. The outer end of the rotary cantilever 6 is close to the tank wall, and the scraper blade 7 installed at the bottom is parallel to the sloping bottom of the tank. During the rotation of the rotary cantilever 6, the scraper blade 7 can scrape the sludge settled at the bottom of the tank towards the center of the tank along the gradually decreasing slope of the bottom, facilitating subsequent centralized discharge.

[0031] Based on any of the above technical solutions, a further optimization is made as follows: the outer bottom of the sedimentation tank 17 is higher than the center of the sedimentation tank 17, and the bottom of the scraper 7 is arranged parallel to the bottom of the sedimentation tank 17.

[0032] Based on any of the above technical solutions, a further optimization is made as follows: the lifting device includes a heavy-duty corrosion-resistant hydraulic lifting cylinder 8 that is fixedly embedded in the center bottom of the sedimentation tank 17. The top of the piston rod of the hydraulic lifting cylinder 8 is fixed to the bottom of the vertical support 2. A protective cylinder 9 is provided on the outside of the hydraulic lifting cylinder 8. The top sealing cap of the protective cylinder 9 is movable through the central hole and sealed to the outer side wall of the piston rod of the hydraulic lifting cylinder 8.

[0033] The lifting device employs a heavy-duty, corrosion-resistant hydraulic lifting cylinder 8 pre-embedded in the center of the sedimentation tank 17, making it better suited to the environment. The piston rod moves up and down via pressure changes in the hydraulic oil of the externally supplied hydraulic system, thereby raising and lowering the top vertical support 2. Since this heavy-duty, corrosion-resistant hydraulic lifting cylinder 8 is used in a wastewater treatment environment, a protective sleeve 9 is installed on its exterior to reduce damage from corrosive wastewater. A sealing cap, which seals with the piston rod, is installed on the top of the protective sleeve 9, effectively preventing the intrusion of wastewater, sludge, and other impurities, thus protecting the internal components of the lifting cylinder.

[0034] Based on any of the above technical solutions, a further optimization is made: the rotary drive component includes a rotary bearing 10, and the rotary bearing 10 is a corrosion-resistant single-row cross roller type rotary bearing 10.

[0035] The slewing drive unit employs a corrosion-resistant single-row crossed roller slewing bearing 10, mounted at the bottom of the vertical support 2. When the motor of the slewing bearing 10 provides power, the inner or outer ring of the slewing bearing 10 begins to rotate, thereby driving the connected sludge scraper to rotate around the vertical support 2. The single-row crossed roller structure allows the slewing bearing 10 to withstand large axial forces, radial forces, and overturning moments, ensuring the stability of the sludge scraper during rotation. Due to its application in wastewater treatment environments, the corrosion-resistant design ensures that the slewing bearing 10 will not have its performance affected by corrosion even under prolonged contact with wastewater.

[0036] Based on any of the above technical solutions, a further optimization is made by providing a plurality of guide holes 11 at intervals along the length direction on the surface of each of the scraper blades 7.

[0037] When the scraper blade 7 rotates with the rotary cantilever 6, the guide holes 11 on its surface allow some water to pass through the holes and flow through the scraper blade 7, forming a water passage. When the scraper blade 7 scrapes the sludge at the bottom of the pool, the flow thrust generated by the water flowing through the guide holes 11 can help stir the sludge, making it mix with water to form a more fluid slurry. At the same time, the guide holes 11 can reduce the water resistance when the scraper blade 7 rotates, avoiding the formation of a water wedge resistance in front of the scraper blade 7 due to excessive sludge accumulation, making the scraper run more smoothly.

[0038] Based on any of the above technical solutions, a further optimization is made as follows: an annular support 12 is provided in the sedimentation tank 17 above the slewing bearing 10, and swing beams 13 are symmetrically fixed on both sides of the outer side wall of the vertical support 2 at the top of the annular support 12, with the bottom of the outer ends of the two swing beams 13 abutting against the top of the annular support 12.

[0039] The annular support 12 is fixed inside the sedimentation tank 17 and above the slewing bearing 10, forming a horizontal annular track. The swing beams 13, which are symmetrically installed on both sides of the vertical support 2, have their outer bottom ends abutting against the top of the annular support 12. When the slewing bearing 10 drives the vertical support 2 to rotate, the outer ends of the swing beams 13 slide circumferentially along the top of the annular support 12. At the same time, the swing beams 13 can swing slightly around their connection point with the vertical support 2 to accommodate radial displacement during rotation.

[0040] The radial force and overturning moment generated when the sludge scraper rotates are transmitted to the swing beam 13 through the vertical support 2, and then distributed to the annular support 12 from the outer end of the swing beam 13. Finally, they are borne by the wall of the sedimentation tank 17, forming a stable mechanical support system.

[0041] Based on any of the above technical solutions, a further optimization is that when the swing beam 13 follows the vertical support 2 to rotate slowly, there is relative movement between it and the top of the annular support 12.

[0042] Based on any of the above technical solutions, a further optimization is made as follows: the water inlet includes a water inlet connector 14 fixed on the swing beam 13, the water inlet connector 14 is connected to an external water supply pipeline, and the lower part of the water inlet connector 14 is inclined toward the inner wall of the sedimentation tank 17. When the water inlet connector 14 supplies the water to be treated into the sedimentation tank 17, the water can flow downward along the inner wall of the sedimentation tank 17.

[0043] Wastewater flows in from one end of the water supply pipeline and enters the sedimentation tank 17 through the inlet connector 14, allowing the water to flow evenly along the tank wall. This design avoids direct impact of the water flow on the water in the tank, reduces disturbance to the settled suspended solids, and creates stable hydraulic conditions for the sedimentation process.

[0044] Based on any of the above technical solutions, a further optimization is made: the overflow channel 5 is connected to an external overflow pipeline.

[0045] Example 2: Compared with Example 1, this example also includes the following technical features:

[0046] Based on any of the above technical solutions, a further optimization is made as follows: an auxiliary lifting device is symmetrically arranged above the outer end of each of the rotary cantilever 6. The auxiliary lifting device includes a winch 15 fixedly installed on the swing beam 13. The bottom of the wire rope 16 of the winch 15 is fixed to the top of the outer end of the rotary cantilever 6 at the corresponding position. The lifting speed of the wire rope 16 is consistent with the lifting speed of the hydraulic lifting cylinder 8.

[0047] When the hydraulic lifting cylinder 8 drives the vertical support 2 to rise and fall, the winch 15 mounted on the swing beam 13 synchronously pulls the outer end of the slewing cantilever 6 via the wire rope 16. The lifting speed of the wire rope 16 is synchronized with that of the hydraulic lifting cylinder 8 to ensure that the slewing cantilever 6 remains horizontal during the lifting process, and to prevent the scraper 7 from tilting due to uneven force at both ends; the wire rope 16 is kept taut.

[0048] In this invention, the sedimentation tank 17, under the action of the lifting device, can drive the scraper to rise and fall within a small range as needed. At the same time, in conjunction with the rotation of the slewing bearing 10, it can achieve layer-by-layer feeding and downward rotation scraping of sludge, avoiding the problem of difficult sludge scraping caused by excessive sludge accumulation. The deposited sludge is scraped layer by layer at a slow speed to make it move and flow, thereby facilitating effective sludge discharge. Under normal conditions, since the external pipeline connected to the sludge discharge channel 4 is in a valve-blocked state, the sludge cannot flow out. When the scraper is working, it can realize the movement of the sludge at the bottom. At the same time, in conjunction with the activation of the valve of the external pipeline and the pump suction, the thick sludge slurry is quickly discharged outward.

[0049] In addition, during the process of supplying water into the sedimentation tank 17 by the two water inlets at the top, the outlet of the water inlet extends to the bottom of the sedimentation tank 17 and flows down the wall. This can reduce the disturbance of the sedimentation tank 17 caused by the water flow. In addition, in order not to affect the normal overflow, the height of the outlet of the two water inlets is lower than the height of the overflow channel 5 to ensure the normal overflow of the water in the upper part.

[0050] The sedimentation tank 17 is securely supported at the top of the tank body by a steel structure support 1. The piston rod of the jack at the bottom center of the sedimentation tank 17 drives the vertical support 2 at the top to rise and fall. The rotating shaft 3 at the top of the vertical support 2 engages with the through hole of the steel structure support 1, ensuring the stable rotation of the vertical support 2. The slewing bearing 10 at the bottom drives the sludge scrapers on both sides to rotate around the vertical support 2. Water inlets are installed on both sides of the tank body, with the outlet end close to the tank wall. This allows the water to flow slowly down the tank wall, reducing disturbance to the water flow inside the tank and aiding in the sedimentation of suspended solids. Because the outlet end is lower than the overflow channel 5, normal overflow drainage is ensured.

[0051] After settling, the sludge gathers to the bottom of the pool under gravity and is discharged through the sludge discharge channel 4 at the bottom, while the supernatant overflows through the overflow channel 5, achieving sludge-water separation. In addition, the lifting device and the rotary drive work together. The rotary drive drives the sludge scraper to rotate, and the lifting device allows the sludge scraper to rise and fall within a small range, thereby achieving the effect of scraping sludge layer by layer and effectively dealing with situations where the sludge accumulation is too thick.

[0052] The above embodiments are only used to illustrate the technical solutions of this utility model, and are not intended to limit it. Although this utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this utility model. For those skilled in the art, any alternative improvements or transformations made to the implementation of this utility model fall within the protection scope of this utility model.

[0053] Any aspects of this utility model not described in detail are known to those skilled in the art.

Claims

1. A sedimentation tank equipped with a rotary sludge scraper, characterized in that: The system includes a steel structure support fixed to the top of the sedimentation tank. A lifter is fixedly installed at the bottom center of the sedimentation tank. A vertical support is provided inside the sedimentation tank above the lifter. A rotating shaft is fixed to the top of the vertical support and is fitted into a through hole in the middle of the steel structure support. A rotary drive is fixedly installed at the bottom of the vertical support. The top of the rotary drive is fixed to the top telescopic end of the lifter. Passive sludge scrapers are fixedly installed on the left and right sides of the vertical support above the rotary drive. The gap between the bottom of the sludge scraper and the bottom of the sedimentation tank is adjustable. Water inlets are installed on both sides inside the sedimentation tank. Sludge discharge channels communicating with the outside are provided on both sides of the bottom of the sedimentation tank below the lifter. An overflow channel communicating with the outside is provided on the upper side wall of the sedimentation tank.

2. The sedimentation tank with a rotary scraper according to claim 1, characterized in that: The sludge scraper includes a rotary cantilever arranged radially along the sedimentation tank. The inner end of the rotary cantilever is fixed to the lower outer wall of the vertical support, and the outer end of the rotary cantilever is arranged close to the inner wall of the sedimentation tank. A sludge scraper is fixedly installed at the bottom of the rotary cantilever, and the bottom of the sludge scraper is used to scrape off the sludge accumulated at the bottom of the sedimentation tank.

3. The sedimentation tank with a rotary scraper according to claim 2, characterized in that: The bottom outer side of the sedimentation tank is higher than the center of the sedimentation tank, and the bottom of the sludge scraper is set parallel to the bottom of the sedimentation tank.

4. The sedimentation tank with a rotary scraper according to claim 3, characterized in that: The lifting device includes a heavy-duty, corrosion-resistant hydraulic lifting cylinder that is fixedly embedded in the center bottom of the sedimentation tank. The top of the piston rod of the hydraulic lifting cylinder is fixed to the bottom of the vertical support. A protective cylinder is provided on the outside of the hydraulic lifting cylinder. The top sealing cap of the protective cylinder is movable through the central hole and sealed to the outer side wall of the piston rod of the hydraulic lifting cylinder.

5. The sedimentation tank with a rotary scraper according to claim 4, characterized in that: The rotary drive component includes a rotary bearing, which is a corrosion-resistant single-row crossed roller rotary bearing.

6. The sedimentation tank with a rotary scraper according to claim 5, characterized in that: Several guide holes are provided at intervals along the length of each scraper blade.

7. The sedimentation tank with a rotary scraper according to claim 6, characterized in that: An annular support is provided in the sedimentation tank above the slewing bearing. Swing beams are symmetrically fixed on both sides of the outer wall of the vertical support at the top of the annular support, and the bottom of the outer ends of the two swing beams abut against the top of the annular support.

8. The sedimentation tank with a rotary scraper according to claim 7, characterized in that: The water inlet includes a water inlet connector fixed on the swing beam. The water inlet connector is connected to an external water supply pipeline. The lower part of the water inlet connector is inclined toward the inner wall of the sedimentation tank. When the water inlet connector supplies the water to be treated into the sedimentation tank, the water can flow downward along the inner wall of the sedimentation tank.

9. The sedimentation tank with a rotary scraper according to claim 8, characterized in that: The overflow channel is connected to an external overflow pipeline.

10. The sedimentation tank with a rotary scraper according to claim 9, characterized in that: An auxiliary lifting device is symmetrically arranged above the outer end of each of the slewing cantilever arms. The auxiliary lifting device includes a winch fixedly installed on the swing beam. The bottom of the wire rope of the winch is fixed to the top of the outer end of the slewing cantilever arm at the corresponding position. The lifting speed of the wire rope is consistent with the lifting speed of the hydraulic lifting cylinder.

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