Core structure and applicable scenarios of sludge scraper conveyor

The sludge scraper conveyor is a device commonly used in sewage treatment plants, sludge treatment stations, and other scenarios to transport sludge with high moisture content and high viscosity. Its working principle mainly revolves around the continuous movement of the scraper in a closed or semi closed tank to achieve the transportation of sludge, as follows:

1、 Core structure composition

To understand its working principle, it is necessary to first understand the core components, which mainly include:

1. Conveyor tank body: It is usually a U-shaped or rectangular closed/semi closed tank, which is a channel for sludge transportation. The bottom and side walls of the tank body need to have wear-resistant (based on actual reports) and corrosion-resistant (based on actual reports) characteristics (due to the possibility of acid and alkali components in sludge).

2. Scraper and Chain (or Traction Component): Scrapers are generally made of metal plates (such as steel plates), which are fixed on chains (or belts, steel wire ropes, etc.) at determined intervals to form a scraper chain; The shape of the scraper needs to be adapted to the tank body, and it should be confirmed that it can fit the bottom of the tank to push the sludge.

3. Drive device: composed of a motor, reducer, sprocket (or drum), etc., providing power for the movement of the scraper chain, driving the scraper chain to circulate in the groove.

4. Tensioning device: used to adjust the tightness of the chain, to prevent the scraper from running unstable or falling off due to loose chain, usually installed at the tail of the conveyor.

2、 Specific workflow

1. Sludge entering the tank: The sludge to be transported enters the conveying tank through the feeding port (usually located at one end or above the middle of the conveyor), and due to its own gravity and viscosity, it will accumulate at the bottom of the tank.

2. Traction motion of scraper chain: After the driving device is started, the motor drives the active sprocket (or drum) to rotate through the reducer, thereby pulling the chain (or other traction components) to move. The scraper fixed on the chain moves along the length direction of the groove with the chain.

3. Scraper pushes the sludge forward: Due to the close contact between the scraper and the bottom of the tank (or leaving a small gap), when the scraper moves forward, it will generate thrust on the sludge accumulated in the tank; Due to the mechanical force of the scraper, the sludge overcomes its own friction with the tank and the viscous resistance inside the sludge, and moves forward together with the scraper.

4. Discharge of sludge from discharge outlet: When the scraper moves the sludge to the other end of the conveyor (discharge outlet), due to the design of the tank structure (such as inclined tail or setting discharge outlet), the sludge is discharged from the discharge outlet under the continuous thrust of gravity and scraper, completing the conveying process.

5. Circular operation of scraper chain: After discharging sludge, the scraper continues to move with the chain and returns to the feeding end through the bottom (or top, depending on the machine model, there are horizontal, inclined, vertical and other conveying forms) of the tank, entering the next conveying cycle.

3、 Key design features and principle adaptability

1. Closed/semi closed structure: The sludge has a high moisture content and is prone to dripping. The closed tank can prevent sludge leakage and environmental pollution, while also avoiding the mixing of external impurities.

2. The fit between the scraper and the tank: The scraper should be tightly attached to the bottom of the tank to confirm that it can "scrape" the sludge in the tank and reduce residue; For sludge with high viscosity, some models may design inclined scrapers or increase the hardness of the scraper to prevent sludge from adhering to the scraper and returning with it.

3. Power transmission of traction components: Chain transmission is suitable for heavy-duty and high torque scenarios, and can stably drive the scraper to overcome the resistance of sludge; For long-distance transportation, it is necessary to maintain the tension of the chain through a tensioning device to prevent slipping.

4、 Applicable scenarios and limitations

Suitable for horizontal or small angle inclined (usually ≤ 15 °) transportation of sludge. If large angle or vertical transportation is required, special structures (such as scraper design in the lifting section) need to be matched.

Limitations: For sludge containing large particle impurities such as stones and metal blocks, it may cause the scraper to get stuck or damaged, and pre-treatment is required in advance; In addition, the scraper and groove wear out quickly and require regular maintenance and replacement.