Installation and Calibration of the Large Rotary Scraper Frame

Installation and Calibration of the Large Rotary Scraper Frame

The rotating scraper frame is used to support the rotating scraper. Once installed, the large rotating scraper stand provides stable performance and is ideal for scraping large-sized sand molds. The rotating scraper frame can be mounted directly within the pit. If the base has been machined… Four holes allow it to be mounted on the platform. Generally, large rotary scraper racks are temporarily secured and can be lifted away after use; alternatively, some people permanently fix the base and vertical shaft in an appropriate location within the workshop. If the rotary scraper rack is used frequently over extended periods, fixing it in place eliminates the need for time-consuming installation and alignment procedures. The scraper conveyor is one of the earliest continuous conveying systems. It employs scrapers—attached to a traction element like a chain—that move the conveyed material along a trough in small, discrete piles with each scraper, enabling a steady, uninterrupted flow. Because the scraper blades are positioned perpendicular to their direction of motion, the material in the trough is pushed forward, one piece at a time, by the scraping action of each blade. This is why the supporting component is called a "scraper." When the conveyor includes scraper-bearing components, it’s referred to as a scraper conveyor.

Scraper conveyors are primarily divided into two types: general-purpose and flexible. Flexible scraper conveyors are mainly used in fully mechanized coal mining operations in coal mines, working in tandem with shearer machines to complete the mining process.

The scraper conveyors commonly used in non-ferrous metallurgical plants are versatile, primarily designed for transporting hot lumps, return materials, dust, dry concentrates, and coal. In the 1980s, China imported a lead smelting plant from Germany, where nearly all materials were transported via fully enclosed, standard scraper conveyors.

The installation and calibration method for the large rotary scraper frame is as follows: Dig a pit at an appropriate location in the workshop, place the base inside the pit, and use a level to ensure the base is perfectly horizontal. Next, insert the vertical shaft into the tapered hole of the base and verify that the shaft remains perfectly vertical. Secure the area around the base tightly with shaped sand. Place the positioning tightening ring onto the vertical shaft, then fasten the tightening ring at the desired height using the set screws. Finally, attach the rotating arm so it can freely pivot around the vertical shaft. 3600 degrees. Mount the rotary scraper onto the rotating arm. Do not tighten the clamping screw of the rotary scraper too much. Use a wooden ruler or template to adjust the rotary scraper to the desired radial dimension position. Then, use a spirit level to ensure the rotary scraper is perfectly aligned perpendicular to the vertical axis, guaranteeing that the sand mold produced has accurate dimensions. Finally, securely tighten the clamping bolts of the rotary scraper to prevent it from loosening during the scraping process.

Some castings maintain the same cross-sectional shape and dimensions (such as straight pipes, elbows, and equal-diameter tees), but their length and overall size are significantly larger. Using a true sample mold for these would not only waste valuable mold materials and time but could also lead to substantial deformation of the mold itself. That’s why a guide scraper is employed for shaping instead. The guiding scraper method involves placing a guide plate (rail) directly onto the parting surface, allowing the scraper to move back and forth along the rail while removing excess molding sand, thus forming the sand mold. Unlike the conventional technique where the scraper rotates around a fixed axis, this method uses the guide plate as a stable reference to direct the scraping action—hence the term "guide scraper modeling."