Products Description

A rotary fine screen, also known as a fine screen filter or spiral screen machine, is an internal-feed screen drum cleaner that combines a fine screen cleaner, a screen residue screw elevator, and a screen residue screw press. It is ideal for separating floating, settled, and suspended matter from water in municipal and industrial wastewater treatment plants. It is widely used for solid-liquid separation, residue cleaning, conveying, and dehydration in municipal and industrial wastewater treatment projects.

The rotary fine screen is mainly composed of a cleaning rake bucket, lifting components, grid plates, cleaning push rods, a control panel, a frame, and ground support. It is a new type of solid-liquid separation machinery that integrates the functions of a traditional grid, a conveyor, and a screw press. It can be installed directly in a water channel or in a container box. Sewage flows into the front end of the basket and flows out through the basket gaps, while filter residue is trapped inside. The accumulated residue on the grid also acts as a filter layer, improving filtration efficiency.

When the water level difference between the front and rear of the basket reaches a set value, the deceleration motor automatically starts, driving the basket frame to rotate. When the filter residue reaches a vertical position, it falls into the central hopper, is transported and lifted by the screw, and finally discharged through the outlet into a conveyor for external transport. To clean the filter residue from the grid gaps, two flushing devices are used: misty flushing water removes larger particles, with a flushing water pressure of 0.6 MPa.

The rotating cleaning mesh cylinder of the rotary fine screen moves in a circular motion at a 35° angle in water at 5–8 revolutions per minute, with one-third of the mesh cylinder submerged. Wastewater and floating debris enter the interior of the mesh cylinder from the lower opening. Floating debris adheres to the inner wall of the mesh cylinder and is lifted out of the water. When the mesh cylinder reaches the high point, impurities fall into the garbage conveying system due to gravity and are conveyed and pressed to the discharge outlet. Filtered sewage flows out through the gaps between the mesh cylinders.

rotary fine screen for pretreatment of wastewater

Specification

Model	ZG-600	ZG-800	ZG-1000
Drum diameter D (mm)	600	800	1000
Drum length L1(mm)	650	850	1000
Max water level H4(mm)	400	520	670
Power(kw)	0.75	0.75	1.5
Channel depth H1 (mm)	600-800	700-1000	900-1200
Discharge height H2(mm)	1000 or customize	1000 or customize	1000 or customize
H3(mm)	Based on reducer type	Based on reducer type	Based on reducer type
Total height H(mm)	H=H1+H2+H3	H=H1+H2+H3	H=H1+H2+H3
Installation length A(mm)	A=H×1.43-0.48D	A=H×1.43-0.48D	A=H×1.43-0.48D
Total length of rotary fine screen L(mm)	L=H×1.74-0.75D	L=H×1.74-0.75D	L=H×1.74-0.75D

Model	ZG-1200	ZG-1400	ZG-1600
Drum diameter D (mm)	1200	1400	1600
Drum length L1(mm)	1200	1400	1500
Max water level H4(mm)	820	950	1100
Power(kw)	1.5	1.5	2.2
Channel depth H1 (mm)	1100-1400	1200-1600	1400-1800
Discharge height H2(mm)	1000 or customize	1000 or customize	1000 or customize
H3(mm)	Based on reducer type	Based on reducer type	Based on reducer type
Total height H(mm)	H=H1+H2+H3	H=H1+H2+H3	H=H1+H2+H3
Installation length A(mm)	A=H×1.43-0.48D	A=H×1.43-0.48D	A=H×1.43-0.48D
Total length of rotary fine screen L(mm)	L=H×1.74-0.75D	L=H×1.74-0.75D	L=H×1.74-0.75D

Model	ZG-1800	ZG-2000	ZG-2200
Drum diameter D (mm)	1800	2000	2200
Drum length L1(mm)	1650	1850	2000
Max water level H4(mm)	1250	1350	1550
Power(kw)	2.2	2.2	2.2
Channel depth H1 (mm)	1600-2000	1800-2100	2000-2300
Discharge height H2(mm)	1000 or customize	1000 or customize	1000 or customize
H3(mm)	Based on reducer type	Based on reducer type	Based on reducer type
Total height H(mm)	H=H1+H2+H3	H=H1+H2+H3	H=H1+H2+H3
Installation length A(mm)	A=H×1.43-0.48D	A=H×1.43-0.48D	A=H×1.43-0.48D
Total length of rotary fine screen L(mm)	L=H×1.74-0.75D	L=H×1.74-0.75D	L=H×1.74-0.75D

Model	ZG-2400	ZG-2600
Drum diameter D (mm)	2400	2600
Drum length L1(mm)	2400	2600
Max water level H4(mm)	1680	1800
Power(kw)	3	3
Channel depth H1 (mm)	2200-2500	2400-3000
Discharge height H2(mm)	1000 or customize	1000 or customize
H3(mm)	Based on reducer type	Based on reducer type
Total height H(mm)	H=H1+H2+H3	H=H1+H2+H3
Installation length A(mm)	A=H×1.43-0.48D	A=H×1.43-0.48D
Total length of rotary fine screen L(mm)	L=H×1.74-0.75D	L=H×1.74-0.75D

Water flow

Model	ZG-600	ZG-800	ZG-1000
Water flow velocity(m/s)	1	1	1
Flow rate(m³/h) with screen gap(mm) 0.5	80	135	240
Flow rate(m³/h) with screen gap(mm) 1	125	220	370
Flow rate(m³/h) with screen gap(mm) 2	190	330	560
Flow rate(m³/h) with screen gap(mm) 3	230	400	685
Flow rate(m³/h) with screen gap(mm) 4	240	430	720
Flow rate(m³/h) with screen gap(mm) 5	250	470	795

Model	ZG-1200	ZG-1400	ZG-1600
Water flow velocity(m/s)	1	1	1
Flow rate(m³/h) with screen gap(mm) 0.5	310	450	585
Flow rate(m³/h) with screen gap(mm) 1	510	720	955
Flow rate(m³/h) with screen gap(mm) 2	765	1100	1440
Flow rate(m³/h) with screen gap(mm) 3	935	1340	1760
Flow rate(m³/h) with screen gap(mm) 4	1010	1440	2050
Flow rate(m³/h) with screen gap(mm) 5	1100	1570	2200

Model	ZG-1800	ZG-2000	ZG-2200
Water flow velocity(m/s)	1	1	1
Flow rate(m³/h) with screen gap(mm) 0.5	745	920	1130
Flow rate(m³/h) with screen gap(mm) 1	1210	1495	1800
Flow rate(m³/h) with screen gap(mm) 2	1830	2260	2730
Flow rate(m³/h) with screen gap(mm) 3	2235	2760	3330
Flow rate(m³/h) with screen gap(mm) 4	2700	3340	4030
Flow rate(m³/h) with screen gap(mm) 5	2935	3600	4260

Model	ZG-2400	ZG-2600
Water flow velocity(m/s)	1	1
Flow rate(m³/h) with screen gap(mm) 0.5	1380	2080
Flow rate(m³/h) with screen gap(mm) 1	2150	3280
Flow rate(m³/h) with screen gap(mm) 2	3250	4530
Flow rate(m³/h) with screen gap(mm) 3	3970	5450
Flow rate(m³/h) with screen gap(mm) 4	4680	6230
Flow rate(m³/h) with screen gap(mm) 5	5220	6750

Feature

The rotary fine screen integrates cleaning, conveying, and pressing, improving energy utilization and reducing operational costs.

The fixed gap between the drums ensures thorough cleaning, overcoming the limitations of movable gaps in ordinary mechanical grilles. Cleaning efficiency exceeds 98%.

Both ends of the drum are welded and fixed with precision-cut thick stainless steel rings to maintain the concentricity of the mesh cylinder during rotation.

The self-cleaning rotary slag scraper provides continuous forced cleaning, ensuring an effective filtering area and significantly improving cleaning efficiency.

The spiral rotation of the conveying and pressing device is powered by the same reducer as the mesh drum. The conveying and pressing spiral is a shaft spiral, with stainless steel spiral blades. The pitch gradually decreases from bottom to top, increasing the pressing capacity progressively.

Application

The rotary fine screen is mainly used to intercept smaller impurities that are not removed by coarse grids in urban sewage treatment plants. It is essential specialized equipment for production processes in urban sewage treatment, the water supply industry, manure treatment centers, textiles, food processing, papermaking, and other industries.