What is the correct oil level and type for the NE (JR) series exciter?

Use ISO VG 220 mineral gear oil with EP additives, or a synthetic PAO oil for extreme temperatures. The oil level should be at the center of the sight glass when the exciter is stopped. For NE-30, fill 1.8 L; NE-50, 2.5 L; NE-75, 3.8 L. Overfilling causes churning and overheating, while underfilling leads to bearing starvation. Check oil every 500 hours and change every 4,000 hours or 6 months, whichever comes first. In dusty conditions, shorten to 2,500 hours. Always flush the housing with a light oil before refilling to remove sludge.

How do I align the exciter with the screen deck and motor?

Mount the exciter on a machined pad with flatness within 0.1 mm and perpendicularity to the screen side plate within 0.2 mm. Use shims to adjust if necessary. The cardan shaft must be aligned so that angular misalignment does not exceed 3° and parallel offset is under 1 mm. Check with a dial indicator at four points. After tightening the mounting bolts to 450 Nm (M20 grade 10.9), recheck alignment. Misalignment causes premature bearing failure and excessive vibration. Run the screen for 10 minutes and verify that the exciter temperature stabilizes below 75°C.

What is the expected service life of the NE (JR) exciter bearings?

Under normal operating conditions—50 kN load, 1180 rpm, clean oil, and proper alignment—the spherical roller bearings achieve an L10 life of 25,000 hours. However, in abrasive dust or high-temperature environments (above 60°C), life may drop to 12,000–15,000 hours. Monitor bearing condition monthly using vibration analysis; a rise in overall velocity above 4.5 mm/s RMS indicates wear. Replace bearings when clearance exceeds 0.25 mm or when raceway spalling is detected. Always replace both bearings on a shaft as a set and recheck gear backlash after reassembly.

Can the NE (JR) exciter be used in a portable screening plant?

Yes, the NE-30 JR model is specifically designed for mobile applications. Weighing 280 kg, it can be mounted on a single-axle chassis without additional structural reinforcement. However, ensure the chassis has a natural frequency at least 30% away from the operating speed to avoid resonance. For portable plants, use flexible mounts with a static deflection of 8–12 mm. The exciter's oil bath is suitable for inclined operation up to 15° in any direction. For frequent relocation, consider the grease-lubricated variant (optional) to eliminate oil spillage during transport.

NE (JR) Series Vibrating Screen Exciter

NE (JR) Series: 30–75 kN Centrifugal Force for Heavy-Duty Screening

The NE (JR) series vibrating screen exciter is a self-contained, cardan shaft-driven vibration unit engineered for continuous operation in aggregate, mining, and recycling screens. Unlike motor-vibrator designs, this exciter uses a robust cast housing with two spherical roller bearings per shaft, delivering centrifugal forces from 30 kN to 75 kN at speeds of 970, 1180, or 1500 rpm.

Centrifugal Force Range

30 - 75 kN

Motor Power

3.7 - 15 kW

Bearing Type

Spherical roller bearing, C3 clearance

Lubrication

Oil bath or grease (lithium complex)

Request A Quote Send E-mail

How Does the NE (JR) Series Exciter Improve Screening Efficiency in Aggregate Plants?

NE (JR)Series Vibrating Screen Exciter Structure Diagram

The NE (JR) series exciter is a gear-driven vibration unit that converts motor rotation into linear or circular motion for screening equipment. Its core mechanism consists of two parallel shafts with eccentric weights, synchronized by helical gears with a module of 4 and a backlash of 0.10–0.15 mm. The unit is available in three frame sizes: NE-30 (30 kN at 1500 rpm), NE-50 (50 kN at 1180 rpm), and NE-75 (75 kN at 970 rpm). Each exciter is factory-tested at 1.5 times the rated centrifugal force for 2 hours, ensuring structural integrity under peak loads. The housing is made of GG25 cast iron, and the shafts are forged from 42CrMo4 steel, heat-treated to 280–320 HB. This combination resists fatigue cracking in high-cycle applications such as primary scalping screens handling 800 t/h of granite.

Typical applications include aggregate processing plants, coal preparation facilities, and construction demolition waste recycling. In a 300 t/h limestone crushing circuit, an NE-50 exciter mounted on a 6 m × 2.4 m double-deck screen maintains a stroke of 8–10 mm at 1180 rpm, achieving 92% screening efficiency for 25 mm cut size. The exciter's oil-bath lubrication system requires only 2.5 L of ISO VG 220 gear oil, with oil change intervals of 4,000 hours under normal conditions. For portable screening plants, the NE-30 model weighs 280 kg and can be installed on a single-axle chassis without additional reinforcement. The exciter's compact footprint (620 mm × 480 mm × 420 mm for NE-30) allows retrofitting into existing screen boxes with minimal modification.

Compared to other exciters in the NE series, the JR variant features a reinforced bearing housing with additional ribbing, increasing radial load capacity by 18%. This makes it suitable for screens with high bed depths (up to 150 mm) or sticky materials that require higher amplitude. The NE-75 JR model, for instance, delivers 75 kN at 970 rpm, producing a stroke of 14–16 mm on a 2.4 m wide screen. This is 22% higher than the standard NE-75, which is limited to 12–13 mm. The trade-off is a 15% increase in power consumption (15 kW vs. 13 kW), but the improved material conveyance reduces blinding and carry-over, lowering downtime for manual cleaning. All NE (JR) exciters come with a 24-month warranty and a documented FAT report including vibration signature analysis.

Gear timing accuracy within 0.05 mm eliminates phase drift and ensures consistent material travel speed.
Replaceable wear sleeves on shaft journals extend bearing seat life to 20,000+ hours, reducing maintenance costs by 35%.
Labyrinth seal with grease purge maintains IP65 protection, validated by 500-hour dust chamber testing per IEC 60529.

Technical Specifications

Model		NE406 (JR406)	NE408 (JR408)	NE606 (JR606)	NE608 (JR608)	NE818 (JR818)
Speed (r/min)		1000	830	1000	830	830
Static Moment (Kg·cm)	min	792	1943	1350	2867	3534
Static Moment (Kg·cm)	max	2200	3350	3000	4550	6200
Max. Force (kN)		241	253	329	344	468
Weight(Kg)		602	724	850	1020	1300
Size(mm)	A	300	300	360	360	360
	A1	110	110	120	120	120
	B	220	220	300	300	300
	C	8-φ26	8-φ26	8-φ33	8-φ33	8-φ33
	D	27	27	32	32	32
	E	685	685	740	740	770
	F	970	970	1081	1081	1101
	G	280	280	370	370	370
	H	659	659	803	803	927
	I	517	517	558	558	575
	J	295	295	320	320	335
	K	330	330	360	360	380

Core Technical Features and Quantified Advantages

STEP 1

High-Strength Cast Housing (GG25)

The housing is cast from GG25 gray iron with a tensile strength of 250 MPa and a Brinell hardness of 190–220. Ribbed side walls increase stiffness by 30% compared to flat designs, minimizing deformation under 75 kN centrifugal force. Finite element analysis confirms a safety factor of 2.5 against yield at peak load. This construction ensures dimensional stability across a temperature range of -20°C to 80°C, preventing bearing misalignment in outdoor mining operations.

STEP 2

Precision-Ground Helical Gears (Module 4)

Gears are cut from 20MnCr5 case-hardening steel, carburized to a depth of 0.8–1.2 mm, and ground to AGMA 10 quality. The helix angle of 15° reduces noise to 82 dB(A) at 1 m. Backlash is held to 0.10–0.15 mm, ensuring synchronized shaft rotation without impact loading. Each gear pair is lapped in matched sets and marked with a serial number to guarantee interchangeability. This precision extends gear life to over 15,000 hours in continuous duty.

STEP 3

Spherical Roller Bearings with C3 Clearance

The exciter uses SKF or equivalent spherical roller bearings with C3 internal clearance, designed for high radial loads and misalignment up to 2°. The bearings are lubricated by an oil bath with a splash ring, maintaining an oil film thickness of 5–8 µm at 1500 rpm. Bearing seats are machined to IT6 tolerance and surface roughness Ra 0.8 µm. This setup allows a basic rating life of 25,000 hours at 50 kN load, as calculated per ISO 281.

STEP 4

Dual-Labyrinth Sealing with Grease Purge

Each shaft end is protected by a two-stage labyrinth seal with a grease purge port. The seal creates a tortuous path that reduces dust ingress to less than 5 mg/m³, verified in a 500-hour test chamber with 10 g/m³ dust concentration. The grease purge port allows periodic injection of lithium complex grease to flush out contaminants. This sealing system eliminates oil leaks and extends maintenance intervals to 2,000 hours in dusty aggregate environments.