Urban drainage pipe network sludge treatment equipment

Abstract

The invention belongs to the technical field of sludge treatment, and particularly discloses urban drainage pipe network sludge treatment equipment which comprises an air floatation tank body. The chain scraper conveyor is arranged above the air floatation tank body; the scrapers are uniformly distributed along the annular path of the chain scraper conveyor; the upper-layer collecting tank is arranged on the outer side of the slag outlet of the air floatation tank body; the translation tank is arranged below the upper-layer collecting tank in a translation manner; the limiting and resetting mechanisms are symmetrically arranged on the outer side of the air floatation tank body and are used for driving the translation groove to reset; and the metering and monitoring mechanism is arranged below the translation groove. A double-layer flow dividing and collecting system is innovatively arranged at the slag discharging opening, the upper layer part is responsible for collecting the scum on the water surface, the lower layer part capable of horizontally moving is used for receiving the underwater scum and discharging the scum to the metering unit below, and the lower layer part is reset for repeated collection after the scraping plate leaves, so that complete capturing of the scum is achieved, and the collection efficiency is improved. And meanwhile, quantitative monitoring on the scum generation rate is realized by metering the discharged scum in real time.

Description

Technical Field

[0001] This invention belongs to the field of sludge treatment technology, specifically referring to a sludge treatment device for urban drainage pipe networks. Background Technology

[0002] Sludge extracted from urban drainage networks is typically complex in composition and has an extremely high water content, requiring effective dewatering treatment. In existing technologies, dissolved air flotation (DAF) is a commonly used method for treating this type of high-water-content sludge. The process typically involves injecting microbubbles into the sludge suspension, causing the bubbles to adhere to the sludge particles and form a composite with a density less than water. This composite then floats to the surface due to buoyancy, forming a scum layer. Subsequently, a mechanical scraper located above the flotation tank separates the scum layer from the water surface. However, the aforementioned existing technologies have inherent drawbacks that are difficult to overcome: Firstly, in the structural design of the flotation tank, to ensure that scum can be smoothly discharged from the tank while preventing uncontrolled water loss, the upper edge of the tank wall at the scum discharge port must be at the same elevation as the set working water level inside the tank. Since the scum layer is suspended by buoyancy, it inevitably has a certain thickness in the vertical direction; that is, part of the scum is exposed above the water surface, while another part is submerged below. To remove this part of the scum below the water surface, the effective working area of ​​the scraper must extend downwards below the water surface. When a scraper circulating on the chain conveyor pushes the scum towards the scum discharge port, the above two conditions conflict: for the scum above the water surface, the scraper can easily push it directly past the upper edge of the scum discharge port, which is at the same level as the water level. However, for the part below the water surface, under the continuous advancement of the scraper and the combined compression of the scum discharge port wall, a significant mechanical compaction effect occurs, causing it to bulge downwards and settle, making the bottom edge of the scum lower than the scraping bottom edge of the scraper. When the scraper follows the preset trajectory of the chain conveyor and tilts upward and flips to pick up and discharge the scum at the end of the scum discharge port, it can only carry out the scum within the scraping height range. The scum below the lower edge of the scraper remains in the pool. Since there are multiple scrapers distributed on the conveyor and they work in a cyclical manner, each scraper will repeat this process when it passes through this point, causing the scum remaining in the pool to accumulate more and more, which seriously affects the recovery rate of the equipment and the stability of long-term operation.

[0003] Secondly, existing equipment lacks effective monitoring of key parameters in the flotation process. In actual operation, the rate of scum formation is dynamic, which directly reflects the effect of flotation separation and the stage it is in (e.g., the initial stage, peak stage, or the final stage of treatment). However, existing sludge thickening flotation devices do not have this monitoring capability. Summary of the Invention

[0004] To address the above issues, this invention provides a sludge treatment device for urban drainage networks. It innovatively incorporates a dual-layer diversion collection system at the sludge discharge outlet. The upper layer collects surface scum, while the movable lower layer receives underwater scum. Under the thrust of a scraper, the lower layer moves horizontally and opens the discharge gate, unloading the scum into the metering unit below. After the scraper leaves, the lower layer resets for repeated collection, avoiding the scum residue and accumulation problems caused by squeezing and settling in traditional scraping methods. This achieves complete scum capture, and the real-time metering of the discharged scum enables quantitative monitoring of the scum generation rate.

[0005] The technical solution adopted by the present invention is as follows: The present invention proposes a sludge treatment device for urban drainage pipe network, including a flotation tank body, a chain conveyor located above the flotation tank body, multiple scrapers evenly distributed along the annular path of the chain conveyor, an upper collection tank located outside the sludge outlet of the flotation tank body, a translation trough located below the upper collection trough, a limit reset mechanism symmetrically located outside the flotation tank body for driving the translation trough to reset, and a metering and monitoring mechanism located below the translation trough.

[0006] Furthermore, the flotation tank body has a translation channel at the upper end of the tank wall at the slag outlet position for the translation trough to slide horizontally.

[0007] Furthermore, the upper end face of the translation trough is in close sliding contact with the bottom surface of the upper collection trough, and the bottom surface of the translation trough is flush with the lower edge of the horizontally moving scraper located in the body of the flotation tank, so that the scraper can contact and push the translation trough.

[0008] Furthermore, the translation trough extends into the flotation tank body with one end open and the other end closed; the bottom of the translation trough is arrayed with multiple door openings, and each door opening is connected to a torque door by a torque hinge; a limit block is fixed on the outside of the translation trough to abut against the tank wall of the flotation tank body to limit the travel of the translation trough into the flotation tank body.

[0009] Furthermore, the limiting and resetting mechanism includes a first support fixed to the outside of the flotation tank body, a limiting rod passing through the first support and connected at one end to the limiting block, and a compression spring sleeved on the limiting rod and with its two ends respectively abutting against the end of the limiting rod and the first support.

[0010] Furthermore, the metering and monitoring mechanism includes a second support symmetrically arranged on the outside of the flotation tank body, a lower flap trough rotatably connected to the second support at one end via a rotating shaft, a swing arm laterally connected to the rotating shaft of the lower flap trough, and a spring force gauge for measuring the pressure borne by the lower flap trough. The spring force gauge is fixed on the outside of the flotation tank body.

[0011] Furthermore, the metering and monitoring mechanism also includes a vertically arranged lifting rod, a slide rail at one end of the swing arm, a sliding shaft at the upper end of the lifting rod, the sliding shaft being slidably inserted into the slide rail, and the lower end of the lifting rod being connected to the internal measuring part of the spring force gauge.

[0012] Furthermore, the preset torque provided by the torque hinge of the torque gate is just enough to maintain the torque gate in its closed state without external load, so that it will open once an external force is applied.

[0013] Furthermore, the width of the scraper is equal to the bottom width of the translation trough, the outer side of the translation trough in the width direction is in close contact with the inner wall of the flotation tank body in the width direction, and the bottom surface of the upper collection trough is flush with the top surface of the flotation tank body.

[0014] Furthermore, when the scraper pushes the translation trough to move until the torque gate is just completely detached from the support at the bottom of the translation channel, the torque gate opens to unload and then closes quickly. Subsequently, the scraper flips upward to detach from the bottom of the translation trough. At this time, the translation trough quickly retracts under the action of the compression spring, allowing the torque gate to regain the support at the bottom of the translation channel.

[0015] Furthermore, the spring balance has an initial pre-tension length, which, through the lifting rod, ensures that the lower flap groove remains horizontal in its initial state.

[0016] The beneficial effects achieved by the present invention using the above structure are as follows: (1) In view of the problem that the underwater scum is squeezed by the scraper at the scum discharge port and causes it to settle and remain, the present invention sets up a translation trough that can be pushed by the scraper to completely receive the scum below the water surface and carry it out of the pool. When the translation trough is moved out, the torque gate at the bottom of it will automatically open to unload the material due to the loss of support. This process fundamentally avoids the settling and residue of scum at the scum discharge port, realizes the complete capture of underwater scum, eliminates the phenomenon of accumulation and leakage, and significantly improves the recovery rate of the equipment and the stability of long-term operation.

[0017] (2) In view of the shortcomings of existing equipment in that it is impossible to effectively monitor the air flotation process, the present invention sets up a metering and monitoring mechanism below the translation tank. Each time the scum unloaded from the translation tank falls into the lower flip-plate tank, its weight is transmitted to the spring force gauge in real time through the linkage structure. By continuously recording the weight data, the generation rate of scum can be quantified, providing reliable data support for operators to judge the stage of air flotation treatment and optimize process parameters, and realizing dynamic monitoring of the entire treatment process.

[0018] (3) The significant advantage of this invention also lies in its ingenious non-powered linkage design. The pushing out and resetting of the translation trough and the triggering of the metering and monitoring mechanism are all driven and linked by the reciprocating motion of the scraper on the chain conveyor. There is no need to add any independent motor or pneumatic power mechanism. This design not only greatly simplifies the equipment structure and reduces manufacturing costs and energy consumption, but also fundamentally improves the reliability and stability of the system and reduces the number of failure points and maintenance workload. Attached Figure Description

[0019] Figure 1 This is a first three-dimensional structural schematic diagram of a sludge treatment device for urban drainage pipe networks proposed in this invention.

[0020] Figure 2 This is a front view of a sludge treatment device for urban drainage pipe networks proposed in this invention.

[0021] Figure 3 This is a schematic diagram showing the positional relationship between the upper collection tank and the lower flap tank of a sludge treatment device for urban drainage pipe networks proposed in this invention.

[0022] Figure 4 This is an exploded structural diagram showing the positional relationship between the translation trough and the translation channel of a sludge treatment device for urban drainage pipe networks proposed in this invention.

[0023] Figure 5 This is a side view of a sludge treatment device for urban drainage pipe networks proposed in this invention.

[0024] Figure 6 for Figure 5 Sectional view of AA.

[0025] Figure 7 This is a schematic diagram of the limit reset mechanism of a sludge treatment device for urban drainage pipe network proposed in this invention.

[0026] Figure 8 for Figure 3 Enlarged view of section B.

[0027] Figure 9 This is a schematic diagram of the metering and monitoring mechanism of a sludge treatment device for urban drainage pipe networks proposed in this invention.

[0028] The components include: 1. Flotation tank body; 11. Translation channel; 2. Chain conveyor; 3. Scraper; 4. Upper collection trough; 5. Translation trough; 51. Doorway; 52. Limiting block; 53. Torque gate; 6. Limiting and resetting mechanism; 61. First support; 62. Limiting rod; 63. Compression spring; 7. Metering and monitoring mechanism; 71. Second support; 72. Lower flap trough; 73. Swing arm; 74. Slide rail; 75. Lifting rod; 76. Sliding shaft; 77. Spring force gauge.

[0029] The accompanying drawings are provided to further illustrate the invention and form part of the specification. They are used together with the embodiments of the invention to explain the invention and do not constitute a limitation thereof. Detailed Implementation

[0030] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without creative effort are within the scope of protection of the present invention.

[0031] In the description of this invention, it should be understood that the terms "upper", "lower", "front", "rear", "left", "right", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention.

[0032] like Figure 1 , Figure 2 , Figure 3 , Figure 4 , Figure 5 , Figure 6 , Figure 7 , Figure 8 , Figure 9 As shown, the present invention proposes a sludge treatment device for urban drainage pipe network, including an air flotation tank body 1, which has a built-in dissolved air release module, water distribution module and other conventional structures necessary to realize the air flotation separation function. This is the prior art and will not be described in detail. A chain plate conveyor 2 is erected above the air flotation tank body 1, and multiple scrapers 3 are perpendicular to the surface of the chain plate and are evenly distributed along the annular path of the chain plate conveyor 2.

[0033] The improvement of the present invention is that two layers of collection components for diversion are provided at the slag outlet position of the flotation tank body 1, including an upper collection trough 4 located outside the slag outlet position of the flotation tank body 1, and a translation trough 5 located below the upper collection trough 4. In order to realize the sliding of the translation trough 5, a translation channel 11 is specially opened at the upper end of the tank wall at the slag outlet position of the flotation tank body 1 for the translation trough 5 to slide horizontally.

[0034] In terms of structural fit, the bottom surface of the upper collection tank 4 is flush with the top surface of the flotation tank body 1. This ensures that the scum above the water surface pushed by the scraper 3 can be smoothly scraped into the upper collection tank 4, and then pushed by manpower or subsequent mechanical equipment to the next processing step. The upper surface of the translation tank 5 is in close sliding fit with the bottom surface of the upper collection tank 4. Crucially, the bottom surface of the translation tank 5 is flush with the lower edge of the scraper 3 that moves horizontally within the flotation tank body 1. At the same time, in order to effectively collect underwater scum and prevent it from leaking to both sides, the outer side of the translation tank 5 in the width direction is in close contact with the inner wall of the flotation tank body 1 in the width direction, and the width of the scraper 3 is exactly equal to the bottom width of the translation tank 5. This design ensures that when the scraper 3 pushes the translation tank 5, the two side walls of the scraper 3 and the closed end of the translation tank 5 together form a moving and relatively closed collection space, ensuring that the underwater scum is completely captured and transported.

[0035] One end of the translation trough 5 extending into the flotation tank body 1 is open to receive underwater scum pushed by the scraper 3, while the other end is closed. The bottom of the translation trough 5 has multiple door openings 51, and each door opening 51 is connected to a torque door 53 by a torque hinge. The preset torque provided by the torque hinge here is precisely calibrated, and its size is just enough to maintain the torque door 53 in a closed state without external load (i.e., only subject to its own weight). Once the gravity of scum is applied, the torque door 53 will open without restraint. In addition, a limit block 52 is fixed on the outside of the translation trough 5.

[0036] In order to enable the translation trough 5 to automatically reset, the equipment also includes a limiting and resetting mechanism 6 symmetrically arranged on the outside of the flotation tank body 1. The mechanism includes a first support 61 fixed on the outside of the flotation tank body 1, a limiting rod 62 connected to the limiting block 52 at one end and passing through the first support 61, and a compression spring 63 sleeved on the limiting rod 62 and with its two ends abutting against the end of the limiting rod 62 and the first support 61 respectively. When the translation trough 5 is pushed out, the compression spring 63 is compressed; when the pushing force disappears, the elastic force of the compression spring 63 will drive the translation trough 5 to reset quickly.

[0037] To achieve quantitative monitoring of the flotation process, this invention provides a metering and monitoring mechanism 7 below the translation trough 5. This mechanism includes a second support 71 symmetrically arranged on the outside of the flotation tank body 1, and a lower flap trough 72 rotatably connected to the second support 71 at one end via a rotating shaft. A swing arm 73 is also laterally connected to the rotating shaft of the lower flap trough 72. One end of the swing arm 73 has a slide rail 74 and a vertically arranged lifting rod 75. The upper end of the rod has a sliding shaft 76 that can be slidably inserted into the slide rail 74, and the lower end is connected to the internal measuring part of a spring force gauge 77. The spring force gauge 77 is fixed to the outside of the flotation tank body 1. To ensure that the lower flap trough 72 remains horizontal in the initial state, the spring force gauge 77 has an initial pre-tension length. This pre-tension length, through the lever action of the lifting rod 75 and the swing arm 73, accurately balances the self-weight of the lower flap trough 72, keeping it in a horizontal state.

[0038] The specific work process is as follows: In the initial state, under the thrust of the compression spring 63 in the limit reset mechanism 6, the translation trough 5 is located inside the flotation tank body 1, with its open end facing the inside of the tank and the bottom of the trough located below the underwater scum layer. At this time, the torque gate 53 is subjected to its own torque and the buoyancy of the water, and remains tightly closed. When the operation begins, the chain conveyor 2 drives the scraper 3 to move horizontally along the preset trajectory. The scraper 3 pushes the scum in front forward. When the scraper 3 at the front of the horizontal movement approaches the scum outlet, the scum above the water surface is pushed forward, while the scum below the water surface is pushed into the open end of the translation trough 5.

[0039] When the scraper 3 contacts the bottom of the translation trough 5, the scraper 3 begins to act as a pusher, pushing the entire translation trough 5 to move outward of the flotation tank body 1 against the elastic force of the compression spring 63. During this process, the compression spring 63 is gradually compressed. As the translation trough 5 is continuously pushed out, the scum on the water surface falls into the upper collection trough 4. At the same time, the underwater scum contained in the translation trough 5 is carried out of the tank by the translation trough 5. When the translation trough 5 moves to the point where the torque gate 53 is just completely detached from the support at the bottom of the translation channel 11, the gravity of the scum instantly overcomes the preset torque of the torque hinge, causing the torque gate 53 to open downward and unload the scum in the trough onto the lower flap trough 72 of the metering and monitoring mechanism 7 below.

[0040] After unloading, as the pressure of the scum disappears, the torque gate 53 closes quickly and automatically under the action of the torque hinge. Almost at the same moment, the scraper 3 begins to flip upwards along the circulation path of the chain conveyor 2, disengaging from the bottom of the translation trough 5. The thrust disappears instantly, and the compressed spring 63 immediately releases its energy, pushing the translation trough 5 to quickly retract and reset, re-entering the flotation tank body 1. The closed torque gate 53 also regains support at the bottom of the translation channel 11, ready to be linked with the next arriving scraper 3 to start a new cycle. During this rapid reset process, even if a small amount of pool water flows into the translation trough 5 due to the scraper 3 leaving, it will be carried back into the flotation tank body 1 and will not be discharged.

[0041] After the scum falls into the lower flap trough 72, its weight is transmitted to the spring force gauge 77 via a lever action (through the linkage of the swing arm 73, slide rail 74, slide shaft 76, and lifting rod 75). This causes the spring force gauge 77 to generate a tension proportional to the weight of the scum and displays a corresponding reading. This tension also causes the lower flap trough 72 to tilt downwards, discharging the scum into the final collection device below. Subsequently, under the preset tension of the spring force gauge 77, it automatically returns to a horizontal state. Through this metering and monitoring mechanism 7, dynamic monitoring of the air flotation process can be achieved. In the initial and final stages of air flotation treatment, the shifting trough... The amount of scum collected in the first 5 stages is less than in the second stage, resulting in the introduction of water. Since water is denser than scum particles, the weight of the mixture per unit volume is greater, causing the instantaneous peak reading displayed by the spring balance 77 to be higher. In the second stage, when the flotation effect is optimal, the scum concentration is high, the water content is low, and the weight per unit volume is relatively light, resulting in a lower peak reading of the spring balance 77. Therefore, by continuously monitoring the changing trend of the spring balance 77 reading, operators can accurately determine the stage of the flotation process, thus providing reliable data support for optimizing and adjusting process parameters.

[0042] It should be noted that, in this document, the terms “comprising,” “including,” or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article, or apparatus.

[0043] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention.

[0044] The present invention and its embodiments have been described above. This description is not restrictive, and the accompanying drawings are only one embodiment of the present invention; the actual structure is not limited thereto. In conclusion, if those skilled in the art are inspired by this description and design similar structures and embodiments without departing from the spirit of the invention, such designs should fall within the protection scope of the present invention.

Claims

1. A municipal sewer network sludge treatment plant comprising a floatation tank body (1), characterized in that: Further comprising a chain conveyor (2) arranged above the air flotation tank body (1), a plurality of scrapers (3) arranged along the annular path of the chain conveyor (2), an upper collecting groove (4) arranged outside the slag outlet position of the air flotation tank body (1), a translation groove (5) arranged below the upper collecting groove (4) and capable of being translated, a limiting reset mechanism (6) symmetrically arranged outside the air flotation tank body (1) and used for driving the translation groove (5) to reset, and a metering monitoring mechanism (7) arranged below the translation groove (5). The air flotation tank body (1) is provided with a translation channel (11) for horizontal sliding of the translation groove (5) at the upper end of the tank wall at the slag outlet position. The upper end surface of the translation groove (5) is in close sliding fit with the bottom surface of the upper collecting groove (4), and the bottom surface of the translation groove (5) is flush with the lower edge of the horizontally moving scraper (3) located in the air flotation tank body (1).

2. A device for treating sludge in a municipal sewer network according to claim 1, characterized in that: The one end of the translation groove (5) extending into the air flotation tank body (1) is open, and the other end is closed; the groove bottom of the translation groove (5) is provided with a plurality of door holes (51), and each door hole (51) is connected with a torque door (53) through a torque hinge; and the outer side of the translation groove (5) is fixed with a limiting block (52).

3. A device for treating sewage sludge in a municipal sewer network according to claim 2, characterized in that: The limiting reset mechanism (6) comprises a first support (61) fixed outside the air flotation tank body (1), a limiting rod (62) penetrating through the first support (61) and connected with the limiting block (52) at one end, and a compression spring (63) sleeved on the limiting rod (62) and abutting against the end of the limiting rod (62) and the first support (61) at both ends.

4. A device for treating sewage sludge in a municipal sewer network according to claim 3, characterized in that: The metering monitoring mechanism (7) comprises a second support (71) symmetrically arranged outside the air flotation tank body (1), a lower flap groove (72) rotatably connected with the second support (71) at one end through a rotating shaft, a swing arm (73) connected with the rotating shaft side of the lower flap groove (72), and a spring dynamometer (77) for measuring the pressure borne by the lower flap groove (72), wherein the spring dynamometer (77) is fixed outside the air flotation tank body (1).

5. A device for treating sewage sludge in a municipal sewer network according to claim 4, characterized in that: The metering monitoring mechanism (7) further comprises a lifting rod (75) arranged vertically, the swing arm (73) is provided with a slide (74) at one end, the lifting rod (75) is provided with a slide shaft (76) at the upper end, the slide shaft (76) is slidably inserted into the slide (74), and the lower end of the lifting rod (75) is connected with the internal measuring part of the spring dynamometer (77).

6. A device for treating sewage sludge in a municipal sewer network according to claim 5, characterized in that: The preset torque provided by the torque hinge of the torque door (53) is just enough to maintain the self-closed state of the torque door (53) under no external load.

7. A device for treating sewage sludge in a municipal sewer network according to claim 6, characterized in that: The width of the scraper (3) is equal to the groove bottom width of the translation groove (5), the outer side of the translation groove (5) in the width direction is in close contact with the inner wall of the air flotation tank body (1) in the width direction, and the groove bottom surface of the upper collecting groove (4) is flush with the top end surface of the air flotation tank body (1).

8. A device for treating sewage sludge in a municipal sewer network according to claim 7, characterized in that: When the scraper (3) pushes the translation groove (5) to move to the torque door (53) just completely off the support of the bottom of the translation passage (11), the torque door (53) opens the discharge and quickly closes, and then the scraper (3) is turned up to separate from the groove bottom of the translation groove (5), at this time the translation groove (5) is quickly returned under the action of the compression spring (63), so that the torque door (53) reacquires the support of the bottom of the translation passage (11).

9. A device for treating sewage sludge in a municipal sewer network according to claim 8, characterized in that: The spring dynamometer (77) has an initial pre-tension length, which makes the lower turning plate groove (72) just keep horizontal in the initial state through the lifting rod (75).

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