Spezialzylinder Eng

8/3/2019 Spezialzylinder Eng

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Standard and special designs

Food industry applications

Oil / water hydraulics

Stainless acid proof steel

Lind Jensens Maskinfabrik A/S

Kroghusvej 7, Hjmark

DK-6940 Lem St.

Tel.: +45 97 34 32 00 Fax: +45 96 74 42 97

E-mail: [email protected] Home page: www.ljm.dk

Stainless Steel

Cylinders

General:NH 46/47 is a double acting stainlessacidproof hydraulic cylinder. Bore from 25 - 100 mm.

Cylinder tube:Stainless acidproof steel tube.

Piston rod:Centerless ground stainless acid-proof

steel, wich is hard-chrome plated min.20 m.

Operation pressure:Operation pressure: Max. 150 bar.(water: 70 bar)

General:Stainless acidproof hydraulic cylinderas double- / single acting, plunger andmany other varieties.Bore from 25 - 160 mm.

Cylinder tube: Stainless acidproof steel tube.Piston rod:

Centerless ground stainless acid-proof

steel, wich is hard-chrome platedmin. 20 m. Other materials available

on request..

Operation pressure:According to requirements

General:NH 54/55 is a double acting stainlessacidproof hydraulic cylinder. Bore from 25 - 160 mm.

Cylinder tube: Stainless acidproof steel tube.

Piston rod:Centerless ground stainless acid-proof

steel, wich is hard-chrome plated min.20 m.

Operation pressure:Operation pressure: Max. 210 bar.(water: 70 bar)

NH54/55NH46/47 SPECIAL


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Our stainless cylinders are made of acid proof stain-less steel in all material.Sealings are from recognised suppliers / make - nomatter if the liquid is water or oil.

The standard cylinders NH46/47 and NH54/55 canalso be used as basic models for special cylinderswith various versions of:

rod and cylinder mountings bearings and bushings Sealings internal and external positioning sensors integrated non-return and hose burst valves, etc.

The cylinders can operate submerged in seawateror in high aggressive environments such as:

Marine and offshore applications Pharmaceutical industries Fertilizer plants Chemical industries

Stainless steel cylinders

Sewage osmosis processes

Trimming plane on ships

Anti corrosion

In the offshore-, mobile- and food industry

No rust

Long lasting

Efficient

S

alt attack resistent

Sub sea applications


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Cylinders with

Build-In Valves

Load control

Safety



DK-6940 Lem St.

Tel.: +45 97 34 32 00 Fax: +45 96 74 42 97


Built-in valves

LJMs cylinders can be supplied with two types of built-in l oad holding val-ves - pilot operated check valves and overcentre valves.

Pilot operatedcheck valve

Overcentrevalveor load holding valve

* Single or dual function.

* Two sizes - up to 30 lpm and up to 90 lpm.

* Rated for 350 bar.

* Available with all types of balancings for proportional and closedcentre PCVs, regenerative flow, variations in tank pressure etc.

* Different pilot ratios available.

* All valve types in each flow size fits the same cavity.

Function (overcentre valve)

The OCV is basically a pilot assisted leak tight relief valve.The pilot pressure will help the cylinder pressure (or the load inducedpressure) to open the valve. Each valve has a fixed pilot ratio which deter-mines how much influence the pilot has on the opening of the valve.

CE Non balanced valve.

CER Part balanced, to be used in systemswith closed centre direction valves.

CEB Fully balanced, to be used in rege-

nerative systems.


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Cylinders

with integrated

transducer Exact positioning

Measuring control



DK-6940 Lem St.

Tel.: +45 97 34 32 00 Fax: +45 96 74 42 97


Transducers

s standard the cylinder is delivered wiht one of the types of transducers below. How to choose is dependingn what the cylinder has to be used for:

LJMLP: Potentiometer-transducer

LJMLM: Magnetostrictive- transducer

LJMLI: Inductive-transducer


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Exact measurements...

Hydraulic cylinders withintegrated position transducersCombining hydraulics and electronics gives newand greater possibilities for using hydraulic powertransmissions. The combination of hydraulic cylin-ders, transducers and electronically-operated val-ves are important components for industry to usein solving the demands of productivity and quality.With an intregrated position transducer it is possiblecontinuously to register the position of the pistonrod.

are important components of modern machine

design as they meet the demand, large flexibilityin automation jobs. helps simplify machine design and reduce the

number of hydraulic components. At the sametime, the cylinders have considerable reliabilityand a long service-life due to the intregrateddesign which protects against external influencessuch as shock, dirt and humidity from the environ-ment.

gives opportunities to arbitrarily control position,speed and acceleration with precision. In addition,good repeatability with short time response andhigh frequency is achieved.

ConstructionThe stationary part of the transducer is secured tothe endcap of the cylinder and the moveable part issecured to the piston rod of the cylinder. It has to bea hollow piston rod.The position measuring is done when the transducerproduces an analogue or digital signal depending onwhere the moveable part is according to the statio-nary part which means proportionally to the stroke ofthe cylinder.

The seals in the cylinder are of Teflon which securesthat the stick-slip condition at its opimum. At the sametime it gives the cylinder a higher effeciency. This is ofgreat importance to achieve an exact position.

Basic version The fundamental design is based on standard

cylinders in the NH series. The smallest diameter of a piston rod is 30mm.

Possibilities/alternatives Assembly blocks/manifolds for mounting of direc-

tional valves. Built in cartridge. Inductive proximity switches. Through piston rod.

Measurements

Exact positioning

Analog, digital and BUS-systems

Short set-up time

User friendly

Response and reaction

Elegant design

Many possibilities

Evolution in hydraulics

Numerous possibillites of mounting

Test

Starting with LJM Hydraulik


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Telescopic

Cylinders Double acting

Special designs



DK-6940 Lem St.

Tel.: +45 97 34 32 00 Fax: +45 96 74 42 97


Standard

Operating pressure : max. 175 bar

Cylinder tube : Honed tubular steel

Piston rod : Centreless ground steel - hard chrome plated and

polished

Stroke : According to requirements

Seals: : Recognized make

Accessories : Trunnion mounting

Special

Operating pressure : more than 175 bar in special applications

Cylinder tube : Honed tubular steel

Piston rod : Centreless ground steel - hard chrome plated and

polished

Stroke : According to requirements

Seals : According to requirements

Mountings : All kind of mountings to customer request

Surface treatment : Sand blast, metallized, special coatings

and of course in all colors.


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Two steps with powerExcellent design

Long life

Energy

Standard design

Customer demands

Overall high quality

Powerfull

so 9001 : 2000 manufacturer

Cylinders for all purposes

ELEVATING THE TASK...

Pressure test of assembled double acting telescopic cylinder

Telescopic cylinders - double acting

When applications request cylinders with a cobi-nation of long stroke and shourt build-in length thedouble acting telescopic cylinder is the right choiceto make. With a double acting telecopic cylindercontrolled motions are possible, for instance in ap-plicatios as:

Cranes Mobile lifts Elevators

Only the sky is the limit...


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Lind Jensens Maskinfabrik A/SKroghusvej 7, HjmarkDK-6940 Lem St. DenmarkHome page: www.ljm.dk

10 e7

M12x1

O-ring

18

60

77

BKS - S 20 BKS - S 19

STIK

STECKER

PLUG

Inductive Poximity switchesNH 30 cylinder

Housingsize: M12 x 1Nominal senzing distance: 1,5 mmOperating zone: 0- 1,2 mmSupply voltage: 10 - 30 V DCMax. current load: 200 mASwitching frequency: 1000 HzShortcircuit protected: Ja, YesMaterial: stainlessMax. pressure: 500 barProtection class: lP 68

Workingtemperature -25 +80 Grad C

General

High pressure inductive proximity switches for cylinder applications.

Inductive Poximity switches


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Examples of applicationsHydraulic cylinders Inductive Poximity switches


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Hydraulic cylinders with integrated position transducers

Combining hydraulics and electronics gives new and greater possibilities for using hydraulic powertransmissions. The combination of hydraulic cylinders, transducers and electronically-operated valves

are important components for industry to use in solving the demands of productivity and quality. Withan intregrated position transducer it is possible continuously to register the position of the piston rod.

Figure 1. Hydraulic cylinder with integrated position transducer

are important components of modern machine design as they meet the demand, large flexibility inautomation jobs.

helps simplify machine design and reduce the number of hydraulic components. At the same time,the cylinders have considerable reliability and a long service-life due to the intregrated design whichprotects against external influences such as shock, dirt and humidity from the environment.

gives opportunities to arbitrarily control position, speed and acceleration with precision. In addition,good repeatability with short time response and high frequency is achieved.

Applications - possibilities

The LJM series NH XX makes it possible to install intelligent control systems.

These cylinders can be used when:- Position control requires high precision and high repeatability, independent of the stroke.- Movements demand a specific and arbitrary velocity profile.- Short set-up time is important.- The movements of several cylinders must be synchronised.

Figure 2. Example of a movement cycle independent of stroke

The LJM cylinders series NH can be used in mobile, industry and marine applications.

Fullstroke

Used

stroke

Time

NH XX Hydraulic cylinders with integrated position transducers


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LJM

LJM


Examples of applications:

Presses Heavy construction equipmentPlastic injection moulding machine Bending Machines

Moulding machines Harbour rampsRolling mills PlatformsRobots Test equipmentCranes Machine toolsStabilizers Agricultural machineryForest machinery Wind millsExcavation machinery Wood working machinery

These integrated transducer cylinders can be used in open as well as closed-loop control systems.

Figure 3. Basic sketch of a control system

Figure 4. Block diagram for a closed-loop control system

Amplifier ValveHydrauliccylinder

PositionTransducer

PressureTransducer

Machine


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Construction. The stationary part of the transducer is secured to the endcap of the cylinder andthe moveable part is secured to the piston rod of the cylinder. It has to be a hollow piston rod.The position measuring is done when the transducer produces an analogue or digital signal depending onwhere the moveable part is according to the stationary part which means proportionally to the stroke of the

cylinder.The seals in the cylinder are of Teflon which secures that the stick-slip condition at its opimum. At the sametime it gives the cylinder a higher effeciency. This is of great importance to achieve an exact position.

Basic version The fundamental design is based on standard cylinders in the NH series. The smallest diameter of a piston rod is 30mm.

Possibilities/alternatives Assembly blocks/manifolds for mounting of directional valves. Built in cartridge.

Inductive proximity switches. Through piston rod.

Figure 5. Hydraulic cylinder with manifold

TransducersAs standard the cylinder is delivered wiht one of the types of transducers below. How to choose is

depending on what the cylinder has to be used for: LJMLP: Potentiometer-transducer LJMLM: Magnetostrictive-transducer LJMLI: Inductive-transducer

SpecificationsType LJMLP LJMLM LJMLI

Principle Potentiometer Magnetostrictive Inductive

Manufacture Regal Balluf HF-Jensen

Resolution Infinite 0,001 (%) Infinite

Non linearity [%] 0,1 .... 0,025 0,05 (0,03) typical < 0,2 (


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Examples of applicationsHydraulic cylinders with positioning transducer


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Build-in valves

LJMs cylinders can be supplied with two types of build-in load holding valves - pilotoperated check valves and overcentre valves.

Pilotstyret operatedcheck valve

Overcentrevalveor load holding valve

* Single or dual funct ion.

* Two sizes - up to 30 lpm and up to 90 lpm.

* Rated for 350 bar.

* Available with all types of balancing for propor tional and closed centre PCVs,regenerative flow, variations in tank pressure etc.

* Different pilot ratios available.

* All valve types in each flow size fits the same cavity.

Function (overcentre valve):

The OCV is basically a pilot assisted leak tight relief valve.The pilot pressure will help the cylinder pressure (or the load induced pressure) to open the valve.Each valve has a fixed pilot ratio which determines how much influence the pilot pressure has on the open-ing of the valve.


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PilotValve type Valve type ratio l/min

1 CE 30 2:1, 5:1, 10:1

Overcentre valve 1 CER 30 2:1 30

1 CEB 30 5:1

Pilotoperated checkvalve 4 CK 30 3:1

1 CE 90 4:1

Overcentre valve 1 CER 90 4:1 90

1 CEB 90 4:1

Pilotoperated checkvalve 4 CK 90 3:1

Pilot pressure is calculated as follows:

PP = Relief valve setting - load induced pressure

Pilot ratio

Build-in valves

I.e. 30 bar is required to open the valve, if the cylinder is subjected to a load greater than 21,000 kgs. the valve

opens as a relief valve.

CE Non balanced valve.

CER Part balanced, to be used in systemswith closed centre PCVs.

CEB Fully balanced, to be used in rege-nerative systems

Build-in valves


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Lind Jensens Maskinfabrik A/SKroghusvej 7, HjmarkDK-6940 Lem St. Denmark

Examples of applicationsHydraulic cylinders with build in valves

Spezialzylinder Eng

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