NV NTK 8 AL Pneumatic Piston Vibrator Instruction Manual

NV NTK 8 AL Pneumatic Piston Vibrator

Operating instructions for Netter pneumatic linear vibrators Series NTK

• Feb. 2021
• No. 1977E
• Page 1/24

These operating instructions apply to:

• NTK 8 AL

• NTK 15 X NTK 16
  NTK 18 AL

• NTK 18 AL M1

• NTK 25 AL

• NTK 25

• NTK 28 AL

• NTK 40 AL

• NTK 28 AL

• NTK 40 AL

• NTK 110

• Scope of  delivery

  • Please refer to the delivery note for the scope of delivery.
  • Check the packaging for possible transport damage. In the event of damage to the packaging, check the contents for completeness and possible damage. Inform the carrier in the case of damage.

• Designation

  • The pneumatic linear vibrators of the series NTK are hereafter referred to as “NTK”.

• Version of  document

  • Document no. 1977E
  • Version no. 1
  • Date of issue Feb. 2021

General information

• Use and  storage
  • Before installing the NTK read these instructions carefully. It is the basis for any action when dealing with the NTK, and may be used for training purposes. The instructions should be subsequently stored at the operation site.
• Target group
  • The target group for these instructions is technical staff, who have basic knowledge in pneumatics and mechanics.
  • Only complying technicalstorage staff may work on the NTK.
  • The NTK may only be installed, put into operation, maintained, troubleshot and disassembled by persons authorised by the operator.
• Copyright
  • This documentation is protected by copyright.
  • NetterVibration reserves all rights such as translations, reprinting and re-production of the instructions, as well as parts thereof.
• Limitation of liability
  • All technical information, data and instructions for installation, operation and maintenance in these instructions are based on the latest information available at the time of printing  and take our past experience to the best of our knowledge into account.
  • No claims can be derived from the information, illustrations and descrip-tions in these operating instructions.
• The manufacturer does not assume liability for damages resulting from:
  • failure to observe the instructions,
  • improper use,
  • unauthorised repairs,
  • technical modifications,
  • use of non-permissible spare parts.
• Translations are made to the best of our knowledge.
  NetterVibration does not assume liability for translation errors, even if the translation was made by us or on our behalf. Only the original German text remains binding.

Explanation of additions to names in model designations:

• Model designations
  • NTK AL : models with aluminium housing
  • NTK S : models with stainless steel housing
  • NTK X : models with plastic housing
  • NTK HT : models for high ambient temperatures
  • NTK NT : models for low ambient temperatures
  • NTK L : models for oil-free operation
  • NTK NF : low frequency models
  • NTK HF : high frequency models

Directives / standards observed Instruction and warning symbols Personal injuries

• The pneumatic linear vibrators of the series NTK comply with the EC Machinery Directive 2006/42/EC.
• In particular, the standard EN ISO 12100 has been observed.

The following instruction and warning symbols are used in these instructions:

• DANGER
  • indicates an immediate danger.
  • Disregard of this notice will result in death or severe person-al injuries.
• WARNING
  • indicates a potential danger.
  • Disregard of this notice can result in death or severe personal injuries.
• CAUTION
  • indicates a potentially dangerous situation.
  • Disregard of this notice can result in minor or moderate personal injuries.
• NOTICE
  • indicates potential material damage. Disregard of this notice can result in material damage.
• IMPORTANT
  • indicates actions, methods or notes that are not relative to safety, e.g. useful information and tips.
• Environmentally safe disposal
  indicates the obligation of environmentally safe disposal.

Safety

Intended use

• The NTK are intended for generating linear vibrations.
• General applications are: loosening, conveying, sorting, compacting, separating bulk materials and reducing friction. NTK are used for emptying bunkers, as drives for conveyor troughs, sieves and vibrating tables.
• The NTK are designed for installation in machines and may only be put into operation, if it has been assured that the complete machine complies with the regulations of the machinery directive.
• The NTK may also be used outdoors and in dusty and humid environ-ments. The NTK may not be submerged in bulk materials or in liquids.
• Any other use is considered improper.
• Installation, commissioning, maintenance and troubleshooting of the NTK may only be performed by authorised qualified personnel.
• All handling of the NTK is the responsibility of the operator.

Qualification of qualified personnel Falling parts

WARNING

• Falling parts
  The NTK, construction parts as well as fastening screws can come loose due to vibration. Falling parts lead to severe personal injuries.

  • For mounting the NTK use only suitable fastening screws.
  • Use only self-locking washers, self-locking nuts or suitable screw safety agent to secure the NTK.
  • Check the fastening screws after one hour of operation and thereafter at regular intervals (generally monthly).
  • If necessary, tighten the fastening screws with a torque wrench.
  • Appropriate safety measures are compulsory for critical installation situations.

Compressed air

• WARNING

• Compressed air
  A loosened hose which is under pressure can lead to personal injuries.

  • Screw the hose lines on carefully.
  • Check the hose lines and connections after one hour of operation and thereafter regularly (generally monthly).
  • Retighten the hose lines, if necessary.
  • Ensure that the compressed air is disconnected from the supply lines during all work on the NTK.
  • Prevent the NTK from being switched back on during all work.

Moving parts

• WARNING
• Moving parts
  • NTK have moving parts which can cause injury.
  • The direct contact of a vibrating part must be prevented on site by constructive measures, eg. by a screen.
• Silencer
  • NOTICE
  • Operation of the NTK with silencers is mandatory. Silencers reduce the noise level and protect the NTK from contamination entering.
• Dust  protection
• NOTICE NTK may not be operated in a dusty environment without dust protection.

Technical data

Permissible operating conditions

Higher operating pressures and temperatures are only permitted after consultation with and the written consent of application engineers from Netter Vibration.

Freely swinging part
The following table distinguishes between three versions:

The piston swings freely.
The housing is screwed to the mass to be vibrated.

1. Housing
2. Piston
3. Additional oscillating weight

• The piston with an additional oscillating weight swings freely.
• The housing is screwed to the mass to be vibrated.
• The housing swings freely.
• The piston is screwed to the mass to be vibrated.

For types of NTK, where the weight of the piston and the housing are only slightly different, S1 and S2 are indicated, otherwise S1 and S3. The name of the additional oscillating weight used is given in brackets (K+SM 8-2 stands for “piston plus additional oscillating weight SM 8-2”).

Parameters

Type NTK / Freely oscillating part| **Oscillating weight* [kg]| Air consumption [l/min]| Frequency [min – 1 ]| Centrifugal force [N]| Unbalance [cm kg]
---|---|---|---|---|---
2 bar| 6 bar| 2 bar| 6 bar| 2 bar| 6 bar| 2 bar| 6 bar**
8 AL| S1| 0.030| 7| 32| 2,440| 3,657| 15| 44| 0.05| 0.06
(K+SM 8-2)| S2| 0.088| 6| 25| 1,380| 2,080| 15| 50| 0.15| 0.37
15 X| S1| 0.135| 17| 72| 1,745| 2,544| 49| 104| 0.29| 0.33
(K+SM 16-2)| S2| 0.675| 14| 54| 758| 1,152| 53| 123| 1.69| 1.95
16| S1| 0.150| 14| 58| 1,680| 2,400| 42| 106| 0.27| 0.34
16| S3| 1.330| 8| 39| 600| 923| 96| 210| 4.90| 4.50
18 AL , 18 AL M1| S1| 0.210| 19| 68| 1,600| 2,350| 41| 109| 0.29| 0.36
(K+SM 16-1)| S2| 0.530| 13| 58| 972| 1,572| 61| 191| 1.18| 1.41
25 AL| S1| 0.420| 34| 149| 1,289| 1,986| 107| 269| 1.18| 1.24
(K+SM 25-3)| S2| 1.655| 22| 115| 686| 1,080| 177| 419| 6.88| 6.55
25| S1| 0.470| 38| 156| 1,440| 2,270| 127| 374| 1.12| 1.32
25| S3| 2.600| 24| 102| 690| 1,067| 237| 612| 9.10| 9.82
28 AL| S1| 0.590| 38| 135| 1,488| 1,818| 255| 381| 2.10| 2.10
(K+SM 16-2)| S2| 1.130| 30| 136| 1,110| 1,488| 240| 423| 3.55| 3.48
40 AL| S1| 1.240| 54| 220| 1,231| 2,094| 239| 519| 2.88| 2.16
(K+SM 25-3)| S2| 2.475| 36| 210| 900| 1,389| 298| 787| 6.72| 7.44
40| S1| 1.270| 49| 228| 1,200| 1,930| 282| 503| 3.57| 2.46
40| S3| 4.200| 34| 161| 600| 1,108| 385| 1,100| 19.48| 16.36
55 AL| S1| 2.100| 98| 398| 1,500| 2,400| 447| 839| 3.62| 2.66
(K+SM 85-1)| S2| 3.430| 83| 384| 1,113| 1,768| 492| 1,077| 7.25| 6.28
55 NF| S1| 2.100| 101| 408| 1,405| 2,351| 441| 872| 4.08| 2.88
55 NF| S3| 5.900| 64| 330| 884| 1,467| 617| 1,588| 14.40| 13.47
85 NF| S1| 5.200| 166| 545| 1,892| 2,830| 767| 2,215| 3.91| 5.04
85 NF| S3| 12.100| 148| 532| 1,200| 1,838| 1,073| 2,428| 13.59| 13.11
110| S1| 8.000| 210| 652| 2,133| 3,040| 1,505| 3,986| 6.03| 7.87
110| S3| 16.600| 207| 634| 1,447| 2,133| 1,548| 3,974| 13.48| 15.93

Unbalance

• all specified weights incl. fastening screw of additional oscillating weight

• These data are comparative values and can vary depending on the application. Further data on request.

• By changing the weight of the freely oscillating part (e.g. by attaching an additional oscillating weight to the piston or housing), the oscillation band-width and the unbalance change. This means that by selecting the freely oscillating part, the unbalance can be preselected.

• Sound level

  • The sound pressure level is 64 – 79 dB (A) at an air pressure of 6 bar, de-pending on the type (with silencer), and lower at a lower air pressure. ****

• Service life

  • The technical performance data changes over the service life (wear and contamination).

Dimensions for AL except 18

all information in [mm] except H, L and M central position of vibration

• * from NTK 85 E on : 2 connections (L1 and L2)
• ** for NTK 110 E: 2 connections (M1 and M2)
• *** additional mounting holes (amount n) : for NTK 55 E n=4, for NTK 85 E n=6, for NTK110 E n=8

Tightening torques

Netter Vibration recommends the following tightening torques for fastening screws and nuts of the strength class 8.8 (sliding friction coefficient 0.14):

Valves / hoses

•  when using the entire thread length
• Netter Vibration recommends the following cross-sections for 3/2-way valves and hoses:

Type: NTK| Connection thread| **Hose/valve size *| Exhaust air thread**
---|---|---|---
8 AL| M 5| DN 4| M 5 or G 1/8
15 X| G 1/8| DN 4| G 1/8
16| G 1/8| DN 6| G 1/8
18 AL, 18 AL M1| G 1/8| DN 6| G 1/8
25, 25 AL, 28 AL| G 1/4| DN 6| G 1/4
40, 40 AL| G 1/4| DN 6 – 9| G 1/4
55, 55 AL| G 3/8| DN 9 – 12| G 3/8 – G1/2
85, 110| G 3/8| DN 12| G 1/2

Design and function

Function

• The NTK generate linear vibrations.
• The vibration is generated by a freely oscillating, self-reversing piston.
• Both weights, the piston (5) with an additional oscillating weight (6) on the one hand, the housing (2) and the weight to which it is attached on the other, oscillate in relation to their total weights against each other. If the vibration amplitude of the weight to be vibrated should be higher, then a larger additional oscillating weight (6) is simply screwed to the piston (5).
• To keep the weight to be vibrated low, the piston can be connected to it (in the case of steel housings), in which case the housing (2) oscillates freely, if necessary with an additional oscillating weight.
• The compressed air enters chamber A via the air inlet (3). The piston is pressed by the air in the direction of the cover (1). When the piston exceeds a defined position, then compressed air reaches chamber B via control bores in the piston. As the piston surface of chamber B is greater than that of chamber A, the piston is pressed in the opposite direction.
• When another control bore reaches the air outlet (4), then chamber B is vented and the process begins again.
• As the piston always reverses again before the end stop, the exhaust air only produces a slight noise, which is minimized by a silencer (4).

Transport and storage

Transport conditions

• Special conditions of transport are not required.

• Use suitable lifting equipment to move the NTK 85 E and the NTK 110 E.

• A transport lug can be screwed into the piston or into the housing (M 20 thread) when lifting.
  Note: The piston moves out of the housing when lifted and into the housing when lowered.

• Packaging

  • The NTK are packed and ready for assembly. Accessories and add-on parts are delivered unmounted, unless otherwise agreed upon.
  • The packaging protects the NTK from transport damage. The packaging material has been selected from an environmentally safe and technically disposable point of view and is therefore recyclable.
  • The return of packaging to the material cycle conserves raw materials and reduces the amount of waste.

Storage conditions

• Store the NTK in a dry and clean environment.
• Protect the NTK from UV-exposures, weather and ozone.
• The storage temperature is between -20 °C and +60 °C.
• Close all openings when re-storing.
• Preserve the NTK with steel housing before storing:

1. Put anti-corrosion oil into the air in- and outlet of the NTK.
2. Pull the piston of the NTK in and out while turning it several times.
3. Close the air supply connections of the NTK.

Installation

Observe the safety instructions in chap. Safety, from page 5 on.

Standard-installation

Technical data

• Special circuit diagrams are available on request.
• Information regarding tightening torques for screws as well as cross sections for valves and hoses can be found in Ch. Technical data, page 7.

Procedure

When installing the NTK, carry out the following steps in succession:

1. Notice : The NTK must rest fully so that no tension in the housing occurs when tightening the fastening screw, which could cause mechanical damage. Mount the NTK with the central fastening screw and a suitable lock washer on a clean and even surface (±0,1 mm flatness) without any paint residues or burn-ins.
   Depending on the intended use, NTK can be screwed on either with the housing or with the piston.
   Types from size NTK 55 E up have additional mounting holes (4) in the housing.
   If necessary, use all additional mounting holes and the corresponding number of lock washers to additionally secure the housing to the mass to be vibrated.

2. Observe the recommended values for screw sizes and tightening tor-ques.

3. In addition, use a medium-strength liquid safety agent to secure the screw connections.

4. Observe the recommended cross-sections for valves and hoses. For the air supply, preferably use screw connections with integrated seals or liquid sealant. Notice: Do not use sealing tape for the screw connections. Do not use longer screw threads for the air supply than in-tended (e.g. no pipes with external thread). Otherwise, the housing may become deformed and the piston may jam.

5. Fasten the compressed air supply securely.

6. Mount the silencer/silencers.

Air supply

• The loss of pressure increases with hose length. The nominal diameters in Ch. Technical data, from page 7 on, apply to hose lengths up to 3 m. Longer supply lines require larger cross-sections.

Air discharge line
If necessary, the escaping air is diverted through a hose, which must be installed as follows:

1. Remove the silencer.
2. Fasten the exhaust air hose directly to the exhaust air connection.
3. Mount the silencer at the free end of the exhaust hose.

Fitting the  bellows

• If the NTK is to achieve full performance, then the exhaust hose must have a larger nominal size than the supply hose.
• Notice : In dusty environment or with oil-free operation the NTK must be operated with bellows or other suitable dust protection.

How to assemble the optional Netter bellows NFB:

1. Clean (degrease) the contact surfaces on the NTK and on the additional oscillating weight.
2. Remove the protective foil from an adhesive surface on the bellows.
3. Slide the bellows over the piston and glue the bellows to the body of the NTK.
4. Hold the piston by the wrench flats with a wrench. Attach the addition-al oscillating weight to the piston with a screw with a medium-strength screw locking agent. If no additional oscillating weight is used with freely oscillating piston, a sheet metal disk with the diameter of the vibrator housing must be screwed onto the piston.
5. Remove the protective film from the free adhesive surface of the bel-lows and press the adhesive surface onto the additional oscillating weight or the sheet metal disc.
   With the easy-to-release Velcro fasteners on the bellows, the wrench flats on the piston remain accessible.

Supported vibration mass
For inclined or horizontal mounting of the NTK, the vibration mass of the freely oscillating part S1, S2 or S3 (see section Parameters, page 9) may only exceed the following value if the vibration mass is sup-ported by a spring:

Using as  impactor

• Using the NTK as impactor is possible.
• A prior consultation with Netter Vibration is recommended.
• The piston must strike against a surface standing vertically to the NTK.
• For this application lubricated com-pressed air is mandatory.

Provide  shielding
Warning: NTK have moving parts which can cause injuries. Direct contact with an oscillating part must be prevented on site by structural measures, for example by shielding.
For the NTK 8 AL type a cover sleeve can be supplied.

Start-up and operation
Observe the safety instructions in chap. Safety, from page 5 on.

• Permissible operating conditions
  • Please refer to chap. Technical data, page 7 for permissible operating conditions.
• Setting the frequency
  • The frequency of the NTK should be set with the pressure regulator of the maintenance unit.
  • The frequency is reduced by lowering the air pressure before the NTK. The centrifugal force is hereby also reduced. At the same time the amplitude remains almost constant.
• Adjustment of amplitude
  • If required, install a throttle valve in the exhaust air line in order to adjust the amplitude of the NTK by throttling the exhaust air. By throttling the ex-haust air, the centrifugal force is reduced. The frequency hereby remains almost constant.
• Important: Reduced cross-sections already throttle (observe the nominal diameter).
  • Reduce the amplitude only up to approx. 50 %. This can cause start-up problems if below.
• Influence of vibrating mass
  • Depending on the vibration mass attached to the piston, the amplitude and frequency change.
  • A smaller vibration mass increases the frequency and reduces the ampli-tude. A larger vibration mass increases the amplitude and reduces the frequency.
• Setting mist lubricator
  • Set the mist lubricator to the smallest safely adjustable number of drops while the NTK is running. Notice: The NTK is ready for operation only after adjustment and correct  functioning of the mist lubricator.
• Recommended number of drops
  • NetterVibration recommends setting the following number of drops, de-pending on the type of NTK, on the mist lubricators:

Maintenance and servicing

Observe the safety instructions in chap. Safety, from page 5 on.
Cleaning

If necessary clean the surface of the NTK with a moist cloth to remove dust deposits.
To clean the NTK with pressurised water, proceed as follows:

1. Close the supply air and exhaust air openings.
2. Clean the NTK externally with pressurised water.
3. Activate the NTK briefly.

Maintenance plan
Maintenance of the NTK must be carried out as follows:

screws.
Check hose screw connections and hose fittings, retighten if necessary.
Weekly to monthly| Ensure that mist lubricator operates according to regulations. Refill oil if necessary (except for the NTK L).
Clean the filter of the maintenance unit and replace, if necessary.
Monthly| Check fastening screws.
Check hose screw connections and hose fittings, retighten if necessary.
Check hose supply connections for permeability and kinks. If necessary, clean and remove kinks.
Check the function of the silencer. Clean silencer.
Check the function of the NTK.

• Maintenance intervals
  • The maintenance intervals depend essentially on the operating conditions, the service life and how clean the drive medium is.
  • Unfiltered compressed air leads to high wear, clogging of the silencer or complete breakdown of the NTK.
• Loss of performance/ complete cleaning
  • Depending on the operating conditions, increased abrasion can form a deposit which impairs the performance.
  • If you notice loss of performance or standstill of the NTK clean the NTK completely and replace the sealing rings if necessary.
  • For complete cleaning of the NTK it is necessary to remove the piston. The deposit must be removed from the inside of the housing and the piston with an oiled cloth.
• Implementation by Netter
  • Maintenance, repair and general overhaul of the NTK may alternatively be performed by NetterVibration.

Troubleshooting

Malfunctions and causes
In the case of malfunctions of the NTK proceed as follows:

valve. A 3/2-way valve is strictly required, so that the supply line to the NTK is vented.
Cover loose| A leaky cover leads to standstill of the NTK. Tighten screws.
Line cross- sections| Observe recommended cross-sections (see Ch. Technical data, from page 7 on).
Line too long between valve and NTK| Leads to a slow start and an eventual standstill of the piston in the middle position.

If necessary, put a controlled 3/2-way air valve before the NTK.

Exhaust air throttled too much| Open the throttle valve further. Clean silencer.
Thread of grommet is too long| Check if the housing is deformed.

In case of deformed housing, have the NTK checked by Netter Vibration.

Tension during installation| Ensure a flat contact surface.
Temperature below 5 °C| Use NT-Version or heat the environment.
No 3/2-way valve or wrong cross section| Use a 3/2-way valve with adequate cross section.
Rattling| Screws loose| Check fastening screws.
Power loss| Lubrication is missing| Check the function of the mist lubricator.
NTK polluted| Disassemble NTK and clean it.
Wear| Check piston and housing for visible wear (deposit on piston and inside housing). If wear is found clean the NTK completely (see page 21 “…/complete cleaning”).

Alternatively send the NTK to Netter Vibration or re- place it.

Check the function of the mist lubricator.

Operating pressure too low| Check the pressure at the inlet of the NTK during operation. If necessary, increase the pressure. Check line cross-sections.

Spare parts and accessories

• Spare parts
  • There are no spare parts available for the NTK. If necessary, have the NTK checked by NetterVibration.
• Possible accessories
  • The following accessories are available for the NTK:

Hose material and

hose screw connections

| For air supply or discharge, available in various qualities and dimensions
3/2-way valves| For electrical, pneumatic or manual activation
Throttle valves| For amplitude regulation, manually adjustable or pneumatically controllable
Maintenance units| Filter, regulator and mist lubricator
Netter Electronic Timers| Electric or pneumatic, for interval operation
Fixing devices| For temporary or permanent fixing

Special  models
Following accessories are available:

• NTK L for oil-free operation,
• NTK E for ATEX area,
• high temperature (HT) and low temperature (NT) versions,
• versions with plastic housing (NTK X),
• versions with bronze piston (NTK BK),
• versions for side mounting (NTK K and NTK KV),
• version with piston anti-rotation lock (NTK 25 AL K),
• stainless steel versions (NTK S) for use in aggressive atmospheres.

Disposal

• Prices
  • All parts of the NTK must be properly disposed of according to the material specifications. The valid disposal prices of the NTK are available on request.

Material specifications
All parts of the NTK can be recycled.

• • for NTK16 / 25 / 40 ** for NTK X
• Annex
  • Declaration of Incorporation

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