Dulkėtos aplinkos grandinės

Dulkėtoje aplinkoje dirbančios grandinės susiduria su labai problematiška dilema :

  • iš vienos pusės jos turi būti pakankamai tepamos mažinant dėvėjimąsi bei trintį,
  • iš kitos pusės didelė dulkių koncentracija neleidžia jas tepti riebiau, nes drąstiškai padidėja dulkių kibimas, jos veliasi sudarydamos tepalo pasto formos sąnašas.

Sprendimas - ypač žemo klampumo ganėtinai skvarbi penetracinė pakankamas tepimo savybes turinti grandininė alyva ir sausąji tepimą užtikrinantys tepikliai (grafitas, MoS2) :

Padidinto dulkėtumo grandinių tepimo alyvos

Rūšis

Klampumas prie 40ºC, mm2 /s

Tankis, prie 15ºC, kg/m3

Darbinės temperatūros, ºC

Spalva

Panaudojimas, savybės

 

Molyduval

Sekorex M 22 MHZ

 

 

22

 

 

930

 

 

-25 iki +120

 

 

Pilkai rusva

 

Specialiai ypač dulkėtoje aplinkoje dirbančių grandinių specialaus žemo klampumo penetracinės nafteninės bazinės alyvos, sintetinių lipiklių ir sausųjų grafito tepiklių pagrindo skvarbi sunkiai apkrautų ir ekstremaliais darbiniais režimais padidinto dulkėtumo aplinkoje dirbančių grandinių tepimo alyva.

Ypač Cemento, lentpjūvių, statybinių mišinių technologinių linijų grandinėms dažnai dėl dulkėtumo dirbančioms visai sausai.

 

Esant visai ekstremaliam dulkėtumui,

ši grandinių alyva prieš naudojant gali būti praskiesta penetrantu Molyduval Ferroxin.

 

Dulkėtos aplinkos grandinių alyva su molibdenu

MOLYDUVAL Sekorex M 22 MHZ yra specialaus žemo klampumo penetracinės nafteninės bazinės alyvos, sintetinių lipiklių ir sausųjų grafito tepiklių pagrindo skvarbi sunkiai apkrautų ir ekstremaliais darbiniais režimais padidinto dulkėtumo aplinkoje dirbančių grandinių tepimo alyva.

Savybės

·   Labai skvarbi ir puikiai sutepanti grandinės narelius, net jai dirbant beveik sausu režimu išlaiko tepimą

·   Nenusitaškanti nuo greitaeigių besisukančių paviršių

·   Sausieji molibdeno disulfido MoS2 tepikliai užtikrina avarinį grandinės sausąji tepimą bei mažina devėjimąsi bei trintį

·   Grandinės paviršiuje lieka negausus tepimo plėvelės kiekis, kas saugo grandinę nuo dulkių bei jų mišinio pastos sąnašų formavimosi

·   Ženkliai prailgina be tepimo dirbančių cement, lentpjūvių grandinių tarnavimo laiką

·   Atspara ekstremalioms ir smūginėms apkrovoms

·   Geriausios MQL (minimalaus tepimo kiekio technologijos) sutepimo charakteristikos, žemas trinties koeficientas

Pritaikymas

·   Visų tipų grandinėms ir skriemuliams, transporterių grandinėms, dirbančioms padidinto dulkėtumo aplinkoje. Tame tarpe cemento, statybos mišinių, lentpjūvių technologinės įrangos grandinėms

·   Lauke dirbančių birių medžiagų padavimo konvejeriams

Naudojimo patarimai

Tepti teptuku, lašeliniu būdu ar purškimu. Ypač užterštą grandinę prieš tepant nuvalyti.

 

TECHNINIAI PARAMETRAI

Specifikacijos

Vnt.

Rezultatai

Pramoninis žymėjimas

DIN 51502

 

LPF22

Bazinė alyva

 

 

Sintetinė PAG

Spalva  ASTM

 

 

Pilkai ruda

Tankis prie 15oC

DIN 51757 A

kg/m³

930

Klampumo klasė

DIN 51519

ISO-VG

22

Klampumas prie 40oC

DIN 51562

mm²/s

22

Klampumo indeksas

 

 

100

Darbinės temperatūros

 

ºC

-25 iki +120

Sausas tepinas

 

ºC

nuo 250

Tepiklių dalelių dydis

 

um

0,3

 

 

Dusty Environments

Chains operating in a dusty environment benefit from a product that is a combination of

penetrating oil and lubricant.

 

Some lubricants leave a wet, sticky surface that attracts and binds even the softest dust to create a paste

that reduces the speed of the chain, increases power requirements and rapidly abrades and shortens the life of sprockets, links and bushings. Normal operating practice in many dusty environments in metals, cement, paper or flour mills has been to run the chains dry. Excessive wear,  downtime and lost production are the result.

Molyduval Sekorex chain lubricants have changed maintenance practices for the better by providing lubricating solutions for chains operating in dusty environments. Before and after studies show that our lubricants can extend chain life by better penetrating into the working parts of the chain.

The semi-dry lubrication attribute of Molyduval Sekoex TM 22 provides a very light film, giving the appearance of a dry film. This ensures minimum pickup of abrasive dusts, lint, sand, and other particles, thus eliminating formation of abrasive compounds which can increase wear and shorten chain life.

This dual-purpose lube is useful because the oil penetrates to the inside of the chain with oil but leaves the outside of the chain nearly dry. Penetrating oil alone doesn’t work nearly as well.

In extremely dusty environments, such as in a cement plant, a solvent containing antiwear additives (such as a fuel supplement) lubricates chains that would otherwise run completely dry. This extends the life of these chains without attracting dust or causing buildup on the chain.

Case Studies

Carbrook River Sands in Queensland, Australia, supplies a number of different processed sand products including filling sand for sidewalk paving blocks, bagged concrete and mortar mixes for export to places like Hong Kong, and refined filter sand for supply to water purifier companies around Australia. The plant uses a forklift with a lifting capacity of two and one-half tons, which necessitates the use of a multiplate link-type chain. Working nearly eight hours a day in a dusty environment, these chains which were lubricated with engine oil would run dry after only a short time. Switching to a penetrating type of chain lubricant extended the life of the chain and prevented dust from sticking to the chain and working its way into the chain links. Previous lubrication with engine oil in that dusty environment produced a fine grinding paste that obviously shortened the life of the chains. A replacement cost of $300 plus downtime was a costly inconvenience. The cost of lubrication is now reduced with an almost disproportionate increase in the life of the chains.

Wet Environments

In a humid environment (such as a pulp mill), or where chains are subject to water wash-down (such as food plants), it is imperative to displace water from the chain on a regular basis by using a penetrating type of chain lubricant. Regular oil and grease are nonpolar and therefore unable to grab onto the water and remove it. A polar organic solvent included in the formulation of the lubricant works best.

If the chain is running through and/or is immersed in water, a combination of penetrating oil and tacky grease is the best method. This forces the water out initially, and then seals the inside of the chain to prevent water from getting in.

Case Studies

Federal Beef Processors in Rapid City, South Dakota lubricated its drive chains on a daily basis. The company needed a USDA H1 food-grade lubricant that would last longer and resist the high moisture in the plant. By switching to a penetrating-type food-grade chain lubricant, the plant now lubricates the chains only once a week.

 

Atwater Foods in Lyonville, New York also achieved success using the same USDA H1 food-grade penetrating oil and lubricant in a similar chain application throughout its plant. Oscar Cotton, the lead mechanic stated “I’ve been working with equipment for 62 years, and this is the best lubricant that I’ve used. It penetrates faster than any other penetrating oil I’ve used.”

At Maple Leaf Pork in Brandon, Manitoba, Canada, a 1 km (3,280 feet) long quick-chill chain carries pigs through the quick-chill freezer at -45°C. On Monday morning at start-up, this chain would repeatedly jam due to water frozen in its links, causing four hours of downtime at the start of every week. A chain spray system with six nozzles was installed to spray a combination of air and three liquids into the pin area of the chain. Food-grade alcohol is applied to dissolve the ice, then a food-grade penetrating oil and lubricant is applied to displace the water. A synthetic food-grade oil with a pour point of -57°C (-70°F) is then applied to lubricate the chain effectively, even at -45°C. This solution has resulted in a savings of four hours of downtime per week.

A metal parts manufacturing plant in Western Canada was experiencing short life (three months) on a parts chain running through a water bath. By applying a synthetic penetrating-type chain grease via aerosol, the life was extended to several years.

At Schlumberger’s gas meter manufacturing plant in Owington, Kentucky, the parts washer conveyor chains were failing regularly at a cost of $4,300 each. The plant replaced a chain on each machine every three to four months, for a total of six to eight chains per year. It took two workers eight hours to change each chain at a cost of $11 per hour. The lubricant was changed to a penetrating type of chain lubrication, which penetrated into the chain and left behind a heavy-bodied (ISO 100) oil. The results were dramatic. There was no rust showing even after 10 months service, while the previous lubricant showed rust in the first two to three hours after application. Lubricant consumption has been reduced from 15 drops per minute to two to three drops per minute. Schlumberger estimates that it has saved more than $31,000 per year in lubricant, labor and parts costs alone (downtime not included). Don Renfro, maintenance superintendent said “The chains are running the best they have in 18 years.”