Vertical center drive mud scraper and suction machine: the "dredging expert" of sewage treatment sedimentation tanks
In municipal sewage treatment plants, water plants and industrial wastewater treatment systems, sedimentation tanks are the core unit for solid-liquid separation. As a key supporting equipment of the sedimentation tank, the vertical frame center drive mud scraper and suction machine has become a solution for small and medium-sized circular sedimentation tanks with its compact structure and efficient dredging capacity. Through the combination of mechanical transmission and fluid mechanics, it efficiently scrapes, suctions and discharges the sludge deposited at the bottom of the tank to ensure the stable operation of the sedimentation tank. It is an indispensable "desilting expert" in the sewage treatment process.
1. Equipment definition and core functions
The vertical frame center drive scraper and suction machine is a sludge treatment equipment with the central axis as the center of rotation and the central drive device and the scraper and suction assembly connected through a vertical bracket. Its core function is: in a circular sedimentation tank, scrape the settled sludge at the bottom of the tank to the central sludge pit, and then transport the sludge to the outside of the tank through a negative pressure suction system, while skimming off scum on the water surface to maintain the cleanliness and treatment efficiency of the sedimentation tank.
2. Structural composition: compact design, collaborative and efficient
The structure of the vertical frame type scraper and suction machine mainly consists of the following parts:
1. Central drive device: Located in the center of the pool top, it consists of a motor, reducer, transmission shaft, etc. It is the power core of the equipment and drives the entire scraping and suction system to rotate (the speed is usually 0.5-1.5 rpm).
2. Vertical structure: The vertical bracket connecting the central drive device and the scraper arm is made of high-strength steel to ensure structural stability and reduce the occupation of space in the pool.
3. Scraper system: including scraper arm and scraper plate. The scraper arm extends along the diameter of the pool, and the scraper plate fits the bottom of the pool (the gap is adjustable). When rotating, the sludge is pushed to the central mud pit.
4. Sludge suction system: It consists of a sludge suction pipe, a sludge suction port, and a sludge pump (or siphon device). The sludge suction port is located under the scraper arm. It sucks the sludge from the sludge pit and the bottom of the pool through negative pressure and discharges it out of the pool through the pipeline.
5. Scum skimming device: Located at the edge of the pool surface, the scum on the water surface is scraped into the scum tank when the scraper arm rotates, achieving double separation of solid-liquid and scum.
6. Control system: Using PLC or manual control, it can realize automatic operation, fault alarm (such as overload, abnormal liquid level) and other functions to improve operation convenience.
3. Working principle: combination of movement and static, efficient dredging
The working process of the vertical frame scraper and suction machine can be summarized as follows:
1. Rotating scraper: The central drive device drives the vertical frame and scraper arm to rotate slowly, and the scraper scrapes the sludge at the bottom of the pool radially to the central mud pit.
2. Negative pressure suction and discharge: The sludge suction system generates negative pressure through the sludge pump, which sucks the sludge in the sludge pit and the suspended sludge on the scraper arm path into the sludge suction pipe, and transports it to the sludge treatment unit through the sludge discharge pipe.
3. Scum treatment: The scum skimmer rotates with the scraper arm to scrape the scum on the water surface into the scum tank and discharge it from the slag discharge pipe.
4. Circular operation: The equipment continues to rotate to achieve continuous dredging of the sedimentation tank and ensure stable effluent quality.
4. Application scenario: suitable for small and medium-sized circular sedimentation tanks
The vertical frame center drive mud scraper and suction machine is suitable for circular sedimentation tanks, especially small and medium-sized tanks with a diameter of 10-40 meters and a depth of 3-5 meters. Typical application areas include:
- Municipal sewage treatment: primary sedimentation tank and secondary sedimentation tank of urban domestic sewage treatment plant;
- Water plant: raw water sedimentation and sludge treatment in clarifiers;
- Industrial wastewater treatment: wastewater sedimentation tanks in papermaking, printing and dyeing, chemical industry, food processing and other industries;
- Other fields: such as sludge cleaning in aquaculture ponds and landscape ponds.
5. Advantages and Features: Compact and efficient, easy to maintain
Compared with the truss type center drive scraper and suction machine, the vertical frame type has the following significant advantages:
1. Compact structure: The vertical frame design replaces the traditional truss structure, reducing the equipment's footprint and weight, and making the installation more flexible;
2. Stable operation: The rigid structure of the vertical bracket reduces vibration during rotation and extends the life of the equipment;
3. Low energy consumption: Slow rotation speed (0.5-1.5 rpm) and efficient mud suction system reduce power consumption;
4. Easy maintenance: key components (such as driving device, scraper) are easy to inspect and maintain, and daily maintenance costs are low;
5. Strong adaptability: It has low requirements for the flatness of the pool bottom and can adapt to slightly uneven pool bottoms;
6. Thorough desilting: The gap between the scraper and the bottom of the pool is adjustable to ensure that there are no dead ends in the scraping of sludge.
6. Maintenance: the key to extending equipment life
To ensure long-term stable operation of the equipment, regular maintenance is required:
1. Daily inspection: Check the temperature and noise of the driving device daily, whether the mud suction pipe is blocked, and whether the mud scraper is worn;
2. Regular lubrication: Lubricate the bearings and reducer of the driving device every month;
3. Part replacement: Check the wear of the scraper and mud suction port every six months, and replace damaged parts in a timely manner;
4. System cleaning: Thoroughly clean the mud suction pipe and mud discharge pipe every year to prevent blockage;
5. Control system maintenance: Regularly check the operating status of the PLC system and sensors to ensure normal automation functions.
Conclusion: Intelligent upgrade, promising future
With the continuous improvement of environmental protection requirements, vertical frame center drive scraper and suction machines are developing in the direction of intelligence. For example, by installing liquid level sensors and sludge concentration sensors, operating parameters can be automatically adjusted based on the amount of sludge; combined with Internet of Things technology, equipment status can be remotely monitored and faults can be warned in advance. In the future, this kind of equipment will play a more important role in the field of sewage treatment and contribute to the cause of green environmental protection.
With its compact structure and efficient dredging capacity, the vertical frame center-driven mud scraper and suction machine has become an ideal choice for small and medium-sized sedimentation tanks. It not only improves the efficiency of sewage treatment, but also reduces operating costs. It is an indispensable and important component in the field of environmental protection equipment.
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