MPD System

In all branches of industry, we have been witnessing a growing trend towards the automation of processes that were previously performed manually. A typical example of such a process is lubrication, as manual lubrication systems have been increasingly replaced with automatic central lubrication systems.Manual lubrication is for the most part performed at long intervals, and bearings are usually overfilled with grease so that in the first phase of the lubrication interval the

bearings are over-greased. Then, towards the end of the lubrication interval, the bearings are under-greased and there is a risk of impurities, water, etc. getting into the bearings. On the other hand, central lubrication systems work with rather small quantities of grease supplied at short intervals. Another disadvantage of manual lubrication is the usual requirement for a complete shut-down of the entire machine, as well as the high probability of human error.

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Advantages of central lubrication

increased machine availability

reduced maintenance costs

reduced grease consumption

Manual lubrication Automatic lubrication

central lubricating system for the drive stations of conveyor belts in deep underground mines

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DIVISION

A system for automatic lubrication of the

bearings of conveyor belt drives and of other

applications in deep underground mines, without

the need for manual operation.

The MPD system was primarily developed for the automatic lubrication of the drive stations of conveyor belts. However, it can also be used with other mining applications.The lubricating system is based on the components of the QUICKLUB series produced by the world's biggest supplier of central lubrication systems, the American-German manufacturer LINCOLN. The QUICKLUB system is designed for use under the most arduous operating conditions.

grease flows through hydraulic hoses (B) to the individual lubrication points. The compressed air from an external source is connected to the input (A) into the MPD cabinet, and then it is routed to the pneumatic cylinder of the PPG pump through a hand ball valve (4), through an air maintenance unit (5), and possibly through an additional control device (6).

Output: 30,33; 0,65; 0,98; 1,3; 1,63; 1,95; 2,28; 2,6 [cm /stroke]

CEMATECH info 08c/2012-En

System description:The main part of the lubrication system is installed in a lockable sheet-metal cabinet which is suspended directly next to the lubricated machine. The grease is forced into the system by a single-stroke pneumatic pump PPG (1) with a reservoir adapted for the insertion of standard 400 g cartridges, optionally with a 1.5 l reservoir to be filled using a filling pump.The grease supplied by the pump is then channelled through a hydraulic hose, a pressure gauge (2) allowing the monitoring of pressure in the system, to the progressive SSVD divider (3), which further divides this grease, regardless of back-pressures, into the individual lubrication points in the system. The design of this divider depends on the actual number of lubrication points and the required ratios between doses at these points. From the progressive divider, the grease inside the box flows through metal pipes. Outside the box, the

Reservoir volume:

Technical parameters:

0,4 l (cartridge 400 g) or 1,5 l

CZ - 591 01 Zdar nad Sazavou, Libusinska 183, phone/fax: +420 566 630 524, e-mail: cematech@hennlich.czDIVISION CEMATECH, HENNLICH INDUSTRIETECHNIK, spol. s r.o.

CZ - 412 01 Litomerice, Ceskolipska 9, phone.: +420 416 711 111, fax: +420 416 711 999, www.hennlich.czHENNLICH INDUSTRIETECHNIK, spol. s r.o.

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Min. air pressure: 4 bar

Pressure ratio: 40:1

Max. number of lubr. points:

Max. operating pressure: 280 bar

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space for additional control devices

A) Without additional control devices, using pulsating compressed air from another pneumatic device, such as a brake of the drive station. Pulsating compressed air is connected to the input (A) of the MPD cabinet.

B) Connection to an external control system (e.g., APD1). Permanent compressed air is connected to the input (A) of the MPD box. An electromagnetic valve 3-2, 12 VDC, controlled from a superior control system, is installed in the space for additional control devices inside the MPD system box. It is closed during pause time. It is open during operating time. Moreover, this control method allows feedback-checking of the system's function using a sensor installed at the progressive divider.

C) Unit with FESTO internal timer (pictured). Permanent compressed air is connected to the input (A) of the MPD box. A FESTO timer with a built-in valve 3-2, and with accessories, is installed in the space for additional control devices inside the MPD system box. Operating time is preset at 5 seconds. Pause time can be set in the range of 1 to 99,999 minutes.

System function:The MPD system is designed for interval operation, during which pause time and operating time continuously alternate. During pause time, no compressed air is applied at the input into the pneumatic cylinder of the PPG pump. During operating time, air is applied there. During operating time, the PPG pump will always give out only one preset dose of grease, which is then divided by the progressive SSVD divider, according to preset ratios, to the individual lubrication points. Pause time is usually in the range of 0.5 to 5 hours; operating time is usually in the range of 5 seconds to 1 minute.

The MPD system can be controlled in several ways:

DIVISION