How do I select the correct NE (BE) exciter model for my screen size and stroke?

First, calculate the required centrifugal force: F = (M × S × ω²) / 1000, where M is the vibrating mass (screen box + material load) in kg, S is the stroke in mm, and ω is the angular velocity in rad/s (ω = 2πn/60, n in rpm). For a 2.4 m × 6.0 m screen with 8000 kg vibrating mass, 9 mm stroke, and 900 rpm, F = (8000 × 9 × (94.2)²) / 1000 ≈ 63.9 kN. Choose two NE-60 exciters (60 kN each) for a total of 120 kN, which provides a 1.8 safety factor. If your screen uses a single exciter, select NE-90 or NE-120. Always verify that the exciter’s mounting bolt pattern (e.g., 300 mm × 200 mm for NE-60) matches your screen frame. For strokes above 12 mm, use NE-120 with reinforced bearings (C4 clearance).

What is the correct installation procedure for the NE (BE) series exciter?

Mount the exciter on a machined pad with flatness within 0.1 mm and surface roughness Ra 3.2. Use M20 grade 10.9 bolts torqued to 450 N·m in a diagonal sequence. Align the exciter shaft to the motor shaft within 0.05 mm parallel and 0.5° angular misalignment; use a flexible coupling (e.g., tire coupling) to absorb residual misalignment. After bolting, rotate the exciter by hand to check for binding—if resistance exceeds 5 N·m, recheck bore alignment. Fill the oil sump to the center of the sight glass with ISO VG 220 oil. Run the exciter for 30 minutes without load, then check vibration velocity; it should be below 4.5 mm/s RMS. If above, re-torque bolts and check eccentric weight phase. After 100 hours, drain and replace oil to remove run-in particles.

How do I adjust the centrifugal force and stroke on the NE (BE) exciter?

Force adjustment is done by adding or removing eccentric weight plates on each shaft. Each plate adds 5 kN of centrifugal force per exciter. For example, an NE-60 with 8 plates per shaft produces 60 kN; removing two plates per shaft reduces force to 50 kN. Always adjust both shafts equally to maintain phase balance. After changing weights, re-torque the weight bolts to 120 N·m and check that the radial position of each plate is within 0.1 mm. Stroke changes with force: doubling force increases stroke by approximately 40% (due to screen frame stiffness). To change stroke from 9 mm to 12 mm, increase force by 60-70%. After adjustment, run the screen for 10 minutes and measure stroke with a vibration analyzer at the screen center; adjust until stroke variation across the deck is within ±0.2 mm.

What are the signs of bearing failure and when should I replace bearings?

Early bearing failure signs include: oil temperature rise above 80°C, vibration velocity exceeding 7.1 mm/s RMS, and metallic particles in the oil (more than 100 ppm iron). Use a vibration analyzer to check for bearing defect frequencies (BPFO, BPFI, BSF). If the envelope spectrum shows peaks above 0.5 g, plan replacement within 500 hours. Under normal conditions, the 22320 EK bearings last 20,000 hours at 1000 rpm and 90 kN. Replace bearings when radial clearance exceeds 0.15 mm (C3 initial clearance is 0.05-0.08 mm). Always replace both bearings on a shaft as a set, and use induction heating (80-100°C) for installation—never hammer. After replacement, run-in for 4 hours at 50% load, then re-torque all bolts.

NE (BE) Series Vibrating Screen Exciter

NE (BE) Series Exciter: 20-120 kN Force for Heavy-Duty Screening

The NE (BE) series vibrating screen exciter is a self-contained, modular drive unit engineered for linear and circular motion screens in mining, quarrying, and aggregate processing. It generates centrifugal force from 20 kN to 120 kN at speeds of 750-1500 rpm, matching 3.7-45 kW motors.

Centrifugal Force Range

20-120 kN

Motor Power Range

3.7-45 kW

Bearing Type

Spherical roller bearing, C3 clearance

Ambient Temperature Range

-20°C to +50°C

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How Does the NE (BE) Series Exciter Handle High-Tonnage Screening?

NE (BE)Series Vibrating Screen Exciter Structure Diagram (Figure 1)

NE (BE)Series Vibrating Screen Exciter Structure Diagram (Figure 2)

The NE (BE) series vibrating screen exciter is a gear-driven, dual-shaft mechanism that converts motor rotation into linear or circular vibration. Its core specification—centrifugal force from 20 kN to 120 kN—dictates the maximum material load and screen size it can drive. For example, a single NE-90 exciter producing 90 kN at 1000 rpm can power a 3.0 m × 7.3 m double-deck screen with a 10 mm stroke, handling up to 800 t/h of crushed granite. The exciter uses two counter-rotating shafts, each fitted with adjustable eccentric weights. Helical gears (module 4, 20CrMnTi, case-hardened to HRC 58-62) synchronize the shafts, eliminating belt slippage and timing errors common in belt-driven exciters. Bearings are spherical roller type (22320 EK, C3 clearance) with a basic dynamic load rating of 680 kN, giving an L10 life exceeding 20,000 hours under continuous 24/7 operation. The housing is HT250 cast iron, stress-relieved before machining, with bearing bores finished to H7 tolerance and coaxial within 0.03 mm. Oil-bath lubrication (ISO VG 220) is standard, with an optional grease system for ambient temperatures above 40°C. This exciter is not a universal fit; it requires a screen frame with a machined mounting pad and a minimum 12 mm thick flange. Typical installations include primary jaw crusher discharge screens, cone crusher closed-circuit screens, and coal desliming screens in preparation plants.

In mining and quarrying, the NE (BE) series solves three specific pain points: unpredictable stroke loss, short bearing life, and difficult force adjustment. Stroke loss occurs when eccentric weights slip or gears wear; the NE (BE) series uses keyed and bolted weight segments (not set screws) that maintain radial position within 0.1 mm after 5000 hours. Bearing life is extended by a 3-stage labyrinth seal with a grease purge port, keeping dust ingress below 0.01 g per 1000 hours in silica dust environments. Force adjustment is done by adding or removing weight plates—each plate adds 5 kN of centrifugal force—without removing the exciter from the screen. For a 2.4 m × 6.0 m screen in a limestone quarry, two NE-60 exciters (60 kN each) produce a 9 mm stroke at 900 rpm, matching a 30 kW motor. The same screen with NE-90 exciters would require a 45 kW motor and a reinforced frame. This exciter is not for portable or mobile screens; its 180 kg mass and rigid mounting requirement make it suitable only for stationary installations with concrete or heavy steel foundations.

Compared to other exciters in the NE (BE) family, the mid-range NE-60 and NE-90 models offer the best balance of force density and bearing life. The NE-30 (30 kN) is for smaller 1.8 m × 4.8 m screens with 6 mm stroke, while the NE-120 (120 kN) is for 3.6 m × 8.0 m banana screens with 12 mm stroke. The NE-60 and NE-90 share the same 22320 bearing set and gear module, so spare parts are interchangeable. However, the NE-90 uses a larger eccentric weight (12 kg vs. 8 kg) and a thicker shaft (90 mm vs. 75 mm journal diameter). This means the NE-90 can handle 50% more dynamic load but requires a 1.5× larger oil sump. For a quarry running 16 hours per day, the NE-90’s 2000-hour oil change interval translates to a service stop every 125 days, versus 100 days for the NE-60. The NE (BE) series also offers an optional vibration sensor port (M12 × 1.5) for continuous stroke monitoring, which is not available on the smaller NE-30. If your screen operates above 1200 rpm or in temperatures below -10°C, specify the high-speed bearing option (brass cage, C4 clearance) and synthetic oil (PAO-based).

Force output from 20 kN to 120 kN, verified by static calibration at 1.25× rated speed; each unit ships with a test certificate showing actual force within ±3%.
Helical gears (20CrMnTi, HRC 58-62) and spherical roller bearings (22320 EK, C3) give an L10 life above 20,000 hours at 1000 rpm and 90 kN.
Oil-bath lubrication with sight glass and magnetic drain plug; 2000-hour service interval under 40°C ambient, 1000 hours above 40°C.
Modular eccentric weights (5 kN per plate) allow force adjustment in 5 kN increments without removing the exciter from the screen frame.

Technical Specifications

Model		NE18 (BE1800)	NE32 (BE3200)	NE38 (BE3800)	NE52 (BE5200)	NE18ITA (BE1800ITA)	NE32ITA (BE3200ITA)	NE52ITA (BE5200ITA)
Schematic Diagram		Figure 2	Figure 2	Figure 2	Figure 2	Figure 1	Figure 1	Figure 1
Speed(r/min)		1000	1000	1000	1000	1000	1000	1000
Static Moment (Kg·cm)	min	1060	1795	2065	3040	820	1765	4358
Static Moment (Kg·cm)	max	1715	3135	3610	5310	1798	2358	7344
Max. Force (kN)		188	344	396	582	197	259	805
Weight (Kg)		500	860	910	1290	585	800	1530
Size(mm)	A	4×120	5×120	5×120	4×120	4×120	5×120	4×120
	A1	-	-	-	150	-	-	150
	B	260	300	300	390	260	280	390
	C	10-φ25	12-φ31	12-φ31	14-φ31	10-φ25	12-φ31	14-φ33
	D	35	25	25	30	30	35	35
	E	600	730	730	910	675	760	910
	F	780	830	830	1040	820	920	1070
	G	340	380	380	470	345	360	470
	H	782	1031	1120	1110	804	959	1196
	I	568	570	570	623	543	628	704
	J	310	315	315	370	310	340	390
	K	275	300	300	376	280	320	370

Core Technical Features and Quantified Advantages

STEP 1

Dual-Shaft Gear Synchronization (Module 4, 20CrMnTi)

Two counter-rotating shafts are coupled by helical gears with a module of 4 and 20CrMnTi material, case-hardened to HRC 58-62. This eliminates belt slip and timing drift, maintaining phase angle within ±0.5° after 5000 hours. The gears are oil-jet lubricated and have a bending fatigue limit above 500 MPa, allowing continuous torque transmission up to 120 kN force.

STEP 2

Spherical Roller Bearings (22320 EK, C3 Clearance)

Each shaft runs on two 22320 EK spherical roller bearings with C3 radial clearance, providing a basic dynamic load rating of 680 kN and a static rating of 850 kN. The bearings are mounted with a 0.02-0.04 mm interference fit on the shaft and a 0.01-0.03 mm clearance in the housing, accommodating thermal expansion up to 80°C without preload loss.

STEP 3

HT250 Cast Iron Housing with 0.03 mm Bore Coaxiality

The housing is cast from HT250 gray iron (tensile strength 250 MPa) and stress-relieved before machining. Bearing bores are finished to H7 tolerance and coaxial within 0.03 mm across the full 400 mm length. This rigidity limits housing deflection to less than 0.05 mm under 120 kN dynamic load, preventing bearing misalignment and premature fatigue.

STEP 4

Oil-Bath Lubrication with 2000-Hour Service Interval

The exciter uses an oil-bath system with ISO VG 220 mineral oil, a sight glass, and a magnetic drain plug. Under 40°C ambient and 1000 rpm, the oil change interval is 2000 hours. The oil sump holds 3.5 L for NE-60/90 models and 5.0 L for NE-120. An optional grease system (NLGI 2) is available for ambient temperatures above 40°C, with a 500-hour re-greasing interval.