Product Overview:
The SZG series central drive scraper is a suspended sludge removal equipment, suitable for the removal of sludge from circular primary sedimentation tanks, secondary sedimentation tanks, and concentration tanks in water treatment projects.

Construction Features:
The sedimentation pond is made of concrete or steel structure, with the bottom slightly conical in shape. The central part of the bottom features a mud removal sump connected to a mud removal pipe. The working bridge is also constructed of concrete or steel structure. This equipment does not include the pond or the working bridge, which the user must arrange independently. Our factory can handle the design and manufacturing of the steel structure pond and bridge on behalf of the customer.
The mud scraper is composed of a rake frame, a vertical shaft drive unit, and an over-torque safety device, etc.
The rake frame consists of two large rakes and two small rakes arranged in a cross formation, parallel to the slightly conical pool bottom. The frame is rigidly connected to the vertical shaft with a cross head, and the bearings on the shaft are a combination of radial and thrust bearings, lubricated with grease. Underwater, it features sliding bearings composed of nylon bushes, lubricated with pressurized clean water.
The lower end of the vertical shaft extends into the mud斗, with the lower shaft end securely fastened to a scraper blade, used for scraping the accumulated mud from the mud斗 to ensure even discharge.
The drive unit is a three-stage vertical helical pinion reducer, connected to the vertical shaft with a spline coupling. The reducer is mounted on the pedestal of the work bridge. The over-torque safety device is a shear pin, fitted within the spline coupling. In the event of excessive torque during operation, the shear pin is severed, protecting the entire mechanical equipment from damage.

Technical Specifications:

Installation and Operation Requirements:
The top surface of the machine frame must be leveled, with an allowable deviation of 0.50%. The output shaft of the reducer is connected to the vertical shaft using a spline coupling, which features three bolt holes, each equipped with a shear safety pin. This serves as a torque cut-off in case of over-torque, protecting the entire machine.
The scraper blade bottom edge maintains a clearance of 50mm from the pool bottom with a tolerance of ±100mm.
At the bottom of the vertical axis, above the sludge bucket, sliding bearings and nylon bushes are installed, utilizing compressed clean water for lubrication. A Dg15 lubrication water pipe must be set up, extending from outside the pool to the bottom, buried at the bottom of the pool. The outer surface of the pipe must not be higher than the pool bottom surface, and it should extend outward from the sludge bucket, connecting to the pipe fitting of the sliding bearing. Introduce normal pressure clean water to ensure proper lubrication before attempting operation. During normal operation, it is also necessary to connect the pressure clean water before starting the equipment to maintain good underwater bearing lubrication.
The upper end of the vertical shaft features a radial bearing and thrust bearing assembly, lubricated with grease, ensuring good lubrication.
During the trial run, the entire machine should run without load for not less than 2 hours, requiring smooth operation and noise below 80 dB. Load-tested operation should be for not less than 24 hours.