What is the difference between the NEG (HE Improved) series and the standard HE series exciter?

The NEG (HE Improved) series delivers 75 kN of centrifugal force at 980 rpm, compared to 60 kN for the standard HE series. This 25% increase allows for wider screens (up to 3.0 m) or higher tonnages. The improved model also has a 30% larger oil sump (4.5 L vs. 3.5 L), which reduces oil temperature by up to 15°C and extends oil change intervals to 2,000 hours. Bearing life is increased by 25% (L10h > 100,000 hours) due to a stiffer housing and dynamically balanced shafts (G6.3). The mounting footprint is identical, so it is a drop-in replacement.

How do I install and align the NEG (HE Improved) exciter on a vibrating screen?

Install the exciter on a flat, machined mounting pad with a flatness tolerance of 0.1 mm. Use four M24 bolts (grade 8.8 or higher) torqued to 650 Nm. Align the exciter's shaft with the screen's drive shaft using a laser alignment tool; misalignment must not exceed 0.05 mm. Ensure the exciter is mounted so that the oil level sight glass is accessible. After installation, run the screen for 2 hours and check for abnormal vibration or temperature rise above 90°C. Re-torque bolts after the first 100 hours of operation.

What maintenance schedule is recommended for the NEG (HE Improved) exciter?

Check the oil level daily via the sight glass. Change the oil every 2,000 hours or 6 months, whichever comes first, using ISO VG 220 oil. Inspect the magnetic drain plug for metal particles at each oil change. Every 4,000 hours, check the bearing clearance and replace the Viton seals if leakage is observed. Grease the labyrinth seals every 500 hours with a lithium complex grease (NLGI 2). Record bearing temperatures monthly; if temperature exceeds 90°C, investigate load or lubrication issues. A major overhaul is recommended every 20,000 hours.

Can the NEG (HE Improved) exciter be used in explosive atmospheres or hazardous locations?

The standard NEG (HE Improved) exciter is not ATEX-certified for explosive atmospheres. However, an optional ATEX Zone 2 version is available with increased sealing, spark-free materials, and temperature monitoring. For mining applications with methane or coal dust, you must specify the ATEX version. The standard unit has an IP66 rating and can operate in dusty, wet conditions but not in explosive environments. Consult the factory for ATEX certification details and installation requirements.

NEG (HE Improved) Series Vibrating Screen Exciter

NEG (HE Improved) Series Exciter: 75 kN Force, 16 mm Amplitude for Demanding Screening

The NEG (HE Improved) series vibrating screen exciter is a heavy-duty, self-contained vibration generator engineered for continuous operation in mining, quarrying, and aggregate processing. It produces a centrifugal force of 75 kN at 980 rpm, driving a 16 mm amplitude screen stroke.

Centrifugal Force

75 kN

Operating Speed

980 rpm

Amplitude

16 mm

Bearing Type

Spherical roller bearing, C4 clearance

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How Does the NEG (HE Improved) Exciter Handle High-Tonnage Screening?

NEG (HE Improved) Series Vibrating Screen Exciter Structure Diagram

The NEG (HE Improved) series exciter is a direct replacement for older HE models, delivering 75 kN of centrifugal force at 980 rpm. This force translates to a 16 mm amplitude on a typical 2.4 m x 6 m screen, which is sufficient for stratifying particles from 5 mm to 300 mm. The unit weighs 185 kg and mounts via a 4-bolt flange pattern with 24 mm holes. Unlike gear-driven exciters, this model uses two counter-rotating shafts with timing gears, ensuring linear motion. The oil bath lubrication system holds 4.5 liters of ISO VG 220 oil, and the bearing temperature is rated for continuous operation up to 90°C. The improved design features a 30% larger oil sump compared to the standard HE series, which reduces oil degradation in hot climates.

Typical applications include primary crushing circuits in iron ore mines, where the exciter must handle feed sizes up to 1,000 mm and throughputs of 800 t/h. In aggregate quarries, it drives screens that classify 0-40 mm crushed stone, often in dusty and wet conditions. The NEG (HE Improved) series addresses the common failure point of seal leakage: its double-lip Viton seals and grease-purged labyrinth protect the bearings from fine dust ingress. For recycling plants processing construction debris, the exciter's robust construction resists shock loads from tramp metal. Maintenance teams appreciate the external oil sight glass and magnetic drain plug, which allow quick oil condition checks without disassembly.

Compared to the standard HE series, the NEG (HE Improved) offers a 25% increase in bearing life (L10h > 100,000 hours) and a 15% reduction in vibration transmission to the screen frame. This is achieved through a stiffer housing casting and dynamically balanced shafts (G6.3 balance grade). The exciter is also available with optional temperature sensors (PT100) and vibration probes for condition monitoring. While the standard HE series is limited to 60 kN force, the NEG (HE Improved) delivers 75 kN, making it suitable for wider screens (up to 3.0 m) or higher tonnages. The mounting footprint is identical to the HE series, so no frame modification is needed for upgrades.

75 kN centrifugal force at 980 rpm, verified by dynamic balance test (ISO 1940-1)
Oil bath lubrication with 4.5 L capacity and ISO VG 220 oil, extending bearing life to 100,000 hours
Double-lip Viton seals and labyrinth protection, IP66 rated for dust and water ingress

Technical Specifications

Model		NEG30	NEG65	NEG80	NEG100	NEG150
Speed(r/min)		980	980	980	980	980
Static Moment (Kg·cm)	min	583	1404	2116	2860	4290
Static Moment (Kg·cm)	max	1329	3052	4376	5384	7500
Max. Force (kN)		140	321	461	567	790
Weight(Kg)		410	760	1120	1530	1680
Size(mm)	A	3×110	3×140	3×165	5×160	5×160
	B	200	250	310	370	370
	C	8-φ25	8-φ38	8-φ38	12-φ38	12-φ38
	D	30	45	45	45	45
	E	400	510	650	980	980
	F	873	955	993	1133	1133
	G	270	340	400	480	480
	H	618	780	820	762	920
	I	507	601	663	790	790
	J	300	360	370	465	465
	K	250	300	350	400	400

Core Technical Features and Quantified Advantages

STEP 1

75 kN Centrifugal Force at 980 rpm

The exciter generates 75 kN of centrifugal force, which is 25% higher than the standard HE series (60 kN). This force is achieved through optimized eccentric weights (total mass 12.5 kg) and a shaft speed of 980 rpm. The result is a 16 mm amplitude on a 2.4 m wide screen, ensuring efficient stratification of particles from 5 mm to 300 mm. This force level is suitable for screens up to 3.0 m wide and feed rates up to 800 t/h.

STEP 2

Spherical Roller Bearings with C4 Clearance

The exciter uses two spherical roller bearings (SKF 22320 E or equivalent) with C4 internal clearance, designed for high radial loads and misalignment up to 0.5°. The bearings are lubricated by an oil bath (ISO VG 220) and have a calculated L10h life of over 100,000 hours at 980 rpm and 75 kN load. The C4 clearance accommodates thermal expansion and ensures reliable operation at temperatures up to 90°C.

STEP 3

Oil Bath Lubrication with 4.5 L Sump

The improved design features a 4.5-liter oil sump, which is 30% larger than the standard HE series. This reduces oil temperature by up to 15°C and extends oil change intervals to 2,000 hours. The system includes an external oil level sight glass and a magnetic drain plug for easy maintenance. The recommended oil is ISO VG 220 mineral or synthetic, and the unit can be equipped with an optional oil heater for cold starts below -10°C.

STEP 4

IP66 Sealing with Double-Lip Viton Seals

The exciter is protected by double-lip Viton seals and a grease-purged labyrinth, achieving an IP66 rating for dust and water ingress. This sealing system prevents fine particles (down to 5 µm) from contaminating the oil, which is critical in quarry and mining environments. The seals are rated for continuous operation at temperatures from -20°C to 120°C and can be replaced without removing the exciter from the screen frame.