What is the recommended maintenance schedule for the NE (KWD) series exciter?

The exciter requires oil changes every 4,000 operating hours or 6 months, whichever comes first. Use ISO VG 220 mineral oil or equivalent. Check oil level weekly and top up if needed. Inspect seals for leaks every 2,000 hours; replace if worn. Grease the labyrinth seals every 1,000 hours with NLGI 2 lithium grease. After 10,000 hours, inspect bearings and gears for wear; replace if pitting or spalling is found. Always follow the manual for detailed procedures.

How do I select the correct model for my vibrating screen?

Selection depends on screen size, required amplitude, and throughput. Calculate the total vibrating mass (screen box + material load) and required exciting force. For a screen with 5,000 kg mass and desired amplitude of 8 mm, you need an exciting force of approximately 200 kN. Choose NE-45 (200 kN) or NE-60 (250 kN) for safety margin. Also consider power: NE-30 for screens up to 2.4 m wide, NE-45 for 3.0 m, NE-60 for 3.6 m, and NE-75 for 4.2 m. Consult our engineers for detailed selection.

Can the NE (KWD) exciter be used in explosive atmospheres?

Standard models are not ATEX certified. However, we offer optional ATEX Zone 21 and 22 versions with flameproof enclosures and increased safety terminals. These models have additional seals and temperature monitoring. For coal mines or chemical plants, specify ATEX certification when ordering. The exciter's surface temperature is kept below 150°C under normal operation, but in explosive atmospheres, additional measures are required. Contact us for details.

What is the warranty and after-sales support for this exciter?

We provide a 24-month warranty from date of shipment or 12 months from commissioning, whichever occurs first. The warranty covers manufacturing defects in materials and workmanship. We offer global after-sales support with spare parts availability for 10 years. Our engineers can assist with installation, commissioning, and troubleshooting via phone or on-site visits. Regular maintenance training is also available. For warranty claims, provide the serial number and operating hours.

NE (KWD) Series Vibrating Screen Exciter

NE (KWD) Series: Heavy-Duty Exciter for Mining and Quarry Vibrating Screens

The NE (KWD) series vibrating screen exciter is a robust, gear-driven unit designed to generate linear or circular motion in large vibrating screens. Available in four models (NE-30, NE-45, NE-60, NE-75), it delivers power from 30 kW to 75 kW and exciting force up to 350 kN, operating at speeds of 980–1500 rpm.

Power

30 kW to 75 kW

Speed

980 rpm to 1500 rpm

Weight

850 kg to 2200 kg

Ambient Temperature

-20°C to +40°C

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How Does the NE (KWD) Series Exciter Improve Screening Efficiency in Harsh Environments?

NE (KWD) Series Vibrating Screen Exciter Structure Diagram

The NE (KWD) series vibrating screen exciter is a self-contained, gear-driven unit that converts motor rotation into a powerful linear or circular vibration. Unlike unbalanced motor exciters, this series uses a pair of helical gears to synchronize two shafts, creating a controlled exciting force from 100 kN to 350 kN. The NE-30 model, for instance, delivers 30 kW at 980 rpm, making it ideal for medium-duty screens up to 2.4 m wide. All models feature a cast steel housing (ASTM A216 WCB) that withstands shock loads up to 5g and ambient temperatures from -20°C to +40°C. The exciter is lubricated by an oil bath with a capacity of 12–25 liters, depending on model, and uses dual-labyrinth seals to keep out dust and moisture, ensuring reliable operation in the most abrasive conditions.

Typical applications include primary and secondary screening in mining, quarrying, and coal preparation plants. The NE-45 and NE-60 models are frequently used in iron ore and copper mines, where they drive screens with capacities up to 1,200 t/h. In coal preparation, the NE-75 model powers banana screens and desliming screens, handling high moisture and fines without clogging. The exciter's high exciting force and adjustable amplitude (via counterweight adjustment) allow operators to optimize screening efficiency for different feed materials. For instance, increasing the counterweight from 80% to 100% can boost amplitude by 15%, improving stratification for sticky ores. This flexibility reduces downtime and ensures consistent product size.

Compared to other exciters in the series, the NE-30 is the most compact, weighing 850 kg, and is suited for mobile screening plants where space and weight are critical. The NE-75, at 2,200 kg, is a heavy-duty unit designed for the largest screens, such as those in copper concentrators. All models share common mounting dimensions and shaft ends, allowing interchangeability within the series. However, the NE-60 and NE-75 feature larger bearings (240 mm and 260 mm bore, respectively) and upgraded gear hardness (HRC 58-62) for extended life under high loads. This differentiation ensures that customers can select the exact model for their throughput and budget without compromising on reliability.

Heavy-duty cast steel housing (ASTM A216 WCB) with FEA-optimized ribs for 5g shock resistance.
Precision helical gears (AGMA 10) and FAG/NSK bearings with L10 life exceeding 50,000 hours.
Dual-labyrinth seals and oil bath lubrication reduce maintenance intervals to 4,000 hours.

Technical Specifications

Model		NE3.1S (KWD3.1S)	NE3.1S (KWD3.1S)
Speed (r/min)		1000	1000
Static Moment (Kg·cm)	min	1530	2665
Static Moment (Kg·cm)	max	3060	5330
Max. Force (kN)		336	585
Weight (Kg)		980	1410
Size (mm)	A	300	300
	A1	200	200
	B	310	310
	C	8-φ26	8-φ32
	D	34	27
	E	790	900
	F	803	915
	G	364	380
	H	987	1367
	I	627	644
	J	280	298.5
	K	330	330

Core Technical Features and Quantified Advantages

STEP 1

High-Strength Cast Steel Housing (ASTM A216 WCB)

The housing is cast from ASTM A216 WCB carbon steel, with a minimum yield strength of 205 MPa and tensile strength of 485 MPa. FEA analysis confirms it withstands shock loads up to 5g and continuous vibration without fatigue cracking. This ensures structural integrity in primary crushing circuits where large lumps impact the screen deck.

STEP 2

Precision Helical Gears (AGMA 10, HRC 58-62)

Gears are cut to AGMA 10 precision and case-hardened to HRC 58-62, providing high torque capacity and quiet operation (≤85 dB at 1 m). The helical design ensures smooth load transfer and reduces axial forces, extending bearing life. Each gear set is dynamically balanced to ISO 1940 G6.3, minimizing vibration and noise.

STEP 3

Heavy-Duty Bearings (FAG/NSK, L10 Life >50,000 h)

The exciter uses FAG or NSK spherical roller bearings with a dynamic load rating of up to 1,200 kN. Calculated L10 life exceeds 50,000 hours at rated load and speed. Bearings are lubricated by an oil bath and protected by dual-labyrinth seals, ensuring reliable operation in dusty and wet environments.

STEP 4

Adjustable Exciting Force (100–350 kN)

Exciting force can be adjusted by changing counterweight mass, from 100 kN to 350 kN, allowing optimization for different feed materials. This flexibility improves screening efficiency by up to 20% for sticky or fine ores. Adjustment is simple and can be done on-site without special tools.