Ball Mill Hydrostatic Slide Shoe Bearing

Hydrostatic Bearing Grinding Mills

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Ball Mill Bearing Design

Hydrostatic Bearing Grinding Mills Components and mode of functioning: The hydrostatic sliding shoe bearing arrangement works on the principle of a plain bearing. During operation there is no metallic contact between the contact surfaces. The housing protects the bearing shoes and the contact surface from dust and dirt, and is simultaneously the oil container, with a connecting piece for returning the oil to the oil supply system. The bearing shoes are arranged in the lower part of the bearing housing and are supplied with lubricating oil by the oil supply system. The bearing shoe is supported on the lower part of the bearing housing via an axial pivoting bearing so that it can wobble and swivel. As the friction occurring between the ball socket and the spherical segment during relative movements is very small, the bearing shoe easily follows the movements of the sliding ring. There are 4 U--shape grooves in the upper side of the bearing shoe for the high pressure oil supply. Each groove is supplied with a constant oil volume. The oil from the high pressure supply line is divided between the individual grooves of the bearing shoes by an oil stream splitter. The allocation of the connections from the oil stream splitter to the grooves is determined in the general arrangement of piped services. Furthermore, there is a bore in the bearing shoe for receiving the temperature sensor, which must have direct contact with the bearing metal of the sliding coating thereby monitoring the temperature of said coating. The oil pressure in the centre of the bearing shoe is monitored by a pressure transmitter. The bearing shoes in the centre can be adjusted in radial direction by means of an adjusting device. The adjusting device enables individual bearing shoes to be assembled and dismantled. The axial guide is hydro dynamically lubricated. A certain number of round sliding pads is provided according to axial loading. The individual sliding pads are self--aligning and have a bearing metal coating. For quick and problem--free changing of the bearing shoes, a dismounting device is available which can be screwed to the segments of the lower housing sections.

Ball Mills Slide Shoe Bearing Slide Shoe Bearing

Bearing Shoe Assembly with Load Cell

Ball and Socket Bearing

Piston

Slide Shoe Load Cell

Slide Shoe Design

Hydrostatic Slide Shoe Bearing

u ho R

0.5 l

0.5 l

Pressure

Hydrostatic Slide Shoe Standard Design

Oil Pocket

Oil Inlet Port Oil Channel to Oil Pocket With Throttle Valve

Hydrostatic Slide Shoe New Design

Oil Grooves

Separate Oil Inlet Distribution Controlled By Oil Pressure

Lube Unit of Hydrostatic Slide Shoe Bearing - Non-Thrust Bearing

Oil Supply Fixed Bearing

Oil Supply Fixed Bearing

Oil Supply Fixed Bearing Component items of the oil supply system, locating bearing: 20 Oil reservoir 30 Oil level indicator 40 Float type switch 50 Ventilation filter 60 Thermometer 70 Resistance thermometer 81 -- 85 Radiator 91 High pressure pump 92 High pressure pump (stand--by) 121 Electric motor 122 Electric motor (stand--by) 131 + 132 Non--return valve 140 Pressure limiting valve 150 Pressure gauge 160 Pressure switch 170 Thermometer 181 Storage pump 182 Storage pump (stand--by) 211 Electric motor 212 Electric motor (stand--by) 221 + 222 Non--return valve 230 Pressure limiting valve 250 Pressure switch 260 Pressure gauge 271 + 272 Hydraulic accumulator 279 Pressure limiting valve 281 + 282 Contact pressure gauge 291 + 292 2/2--way solenoid valve 301 + 302 Pressure regulation valve 311 + 312 Flow regulation valve 321 + 322 Non--return valve 661 -331 High pressure pump 332 High pressure pump (stand--by)

361 Electric motor 362 Electric motor (stand--by) 371 + 372 Non--return valve 380 Pressure limiting valve 390 Pressure gauge 400 Pressure switch 410 Thermometer 421 Low pressure pump 422 Low pressure pump (stand--by) 451 Electric motor 452 Electric motor (stand--by) 461 + 462 Non--return valve 470 Pressure limiting valve 481 Pressure gauge 490 Pressure switch 500 Oil--flow meter 511 Gear pump 512 Gear pump (stand--by) 541 Electric motor 542 Electric motor (stand--by) 551 + 552 Non--return valve 560 Pressure limiting valve 570 Pressure gauge 580 Oil--flow meter 590 Pressure switch 600 Double change--over filter 610 Heat exchanger 620 Solenoid valve 640 Reflux condenser 650 Terminal box 664 Oil flow divider 671 -- 674 Speed monitor 701 + 702 Oil flow divider

Oil Supply Floating Bearing

Oil Supply Floating Bearing Component items of the oil supply system, floating bearing: 20 Oil reservoir 30 Oil level indicator 40 Float type switch 50 Ventilation filter 60 Thermometer 70 Resistance thermometer 81 -- 85 Radiator 91 High pressure pump 92 High pressure pump (stand--by) 121 Electric motor 122 Electric motor (stand--by) 131 + 132 Non--return valve 140 Pressure limiting valve 150 Pressure gauge 160 Pressure switch 170 Thermometer 181 Storage pump 182 Storage pump (stand--by) 211 Electric motor 212 Electric motor (stand--by) 221 + 222 Non--return valve 230 Pressure limiting valve 250 Pressure switch 260 Pressure gauge 271 + 272 Hydraulic accumulator 279 Pressure limiting valve 281 + 282 Contact pressure gauge 291 + 292 2/2--way solenoid valve 301 + 302 Pressure regulation valve

311 + 312 Flow regulation valve 321 + 322 Non--return valve 331 High pressure pump 332 High pressure pump (stand--by) 361 Electric motor 362 Electric motor (stand--by) 371 + 372 Non--return valve 380 Pressure limiting valve 390 Pressure gauge 400 Pressure switch 410 Thermometer 511 Gear pump 512 Gear pump (stand--by) 541 Electric motor 542 Electric motor (stand--by) 551 + 552 Non--return valve 560 Pressure limiting valve 570 Pressure gauge 580 Oil--flow meter 590 Pressure switch 600 Double change--over filter 610 Heat exchanger 620 Solenoid valve 640 Reflux condenser 650 Terminal box 661 -- 664 Oil flow divider 671 -- 674 Speed monitor 701 + 702 Oil flow divider

Oil Supply for Slide Shoe Bearings Description of functioning: • The high pressure pumps (91 and 331) force the lubricating oil to the oil flow dividers (701, 702 and 661 to 664) and then to the bearing shoes of the hydrostatic sliding shoe bearing arrangement. The flow of lubricating oil is monitored in the oil flow divider by a speed monitor and the oil pressure is monitored by the pressure switches (160 and 400). Moreover, the oil pressure is reduced by pressure limiting valves (140 and 380) in order to avoid overloading of the system.

• The axial guide is supplied with lubricating oil via a separate low pressure pump (421). The oil flow and the oil pressure are monitored. NOTE: To protect the oil storage system from overloading, the pressure limiting valve (230) and the pressure limiting valves on the gas side of the hydraulic accumulators are sealed by TÜV.

Oil Supply for Slide Shoe Bearings Circulation circuit: • The lubricating oil is heated to or maintained at operating temperature in a separate circulation circuit. The oil pressure and the flow of oil are monitored also in this circulation circuit. • The gear pump (511) forces the lubricating oil to a double change-over filter (600) with optical and electric contamination indicator. • In the heat exchanger (610) downstream the temperature of the lubricating oil is limited to a maximum value. This is achieved in the cooling water feed line with a solenoid valve (620) which is controlled via a resistance thermometer (70) in the oil tank.

• When the temperature of the lubricating oil is too low, the oil is heated to operating temperature by radiators (81 to 85) installed in the oil tank.

Oil Supply for Slide Shoe Bearings Oil storage system: • In the hydraulic accumulators (271 and 272) of the oil storage system the compressibility of the nitrogen is used for storing the lubricating oil. • The hydraulic accumulators consist of a liquid part and a gas part with a bubble for gas-tight separation. The liquid part is connected to the hydraulic circuit so that the hydraulic accumulator is filled when the pressure rises and the nitrogen is therefore compressed. • When the pressure decreases the compressed nitrogen expands thus pushing the accumulated lubricating oil in the circuit.

• The initial nitrogen filling pressure is monitored by pressure switches. The storage pump (181) forces the lubricating oil in the hydraulic accumulator up to the given maximum oil pressure. • When the pressure decreases the storage pump is switched on again with a pressure switch (250) until the given maximum oil pressure is reached again.

Oil Supply for Slide Shoe Bearings Interlocking system and monitoring: • A precondition for switching on the oil supply systems is that an adequate filling level is available in the oil tank and the oil temperature is higher than 15° C. • In case of failure or malfunction of an oil supply system the bearing shoes are supplied with oil from the oil storage system. To protect the machine the oil supply is sufficient for a maximum of 4 minutes. • In case of power failure of the oil supply system the 2/2--way solenoid valves (291 and 292) for shutting off the hydraulic accumulators are also de—energized and are therefore opened. • The lubricating oil from the hydraulic accumulators (271 and 272) is pushed via the flow regulation valves (311 and 312) and the oil flow dividers (701, 702 and 661 to 664) to the bearing shoes. • For the description, function and interlocking of the monitoring equipment see the operating manual.

Oil Supply for Slide Shoe Bearings Lubrication chart Lubrication points

No.

Qty.

1

1

2

1

Designation

Oil supply system, locating bearing [1] Oil supply system, floating bearing [1]

Quantity (ltr/kg) per lubrication point Lubricant ref. no.

Initial filling

25 25

Topping up

Lubrication intervals (weeks) Topping up

First change

Further changes

3800

4

[2]

3800

4

[2]

The different makes of lubricant corresponding to the lubricant reference numbers are shown in the table of lubricants in the supplement Important Notes on the Documentation. The supplement is to be found in this folder or at the beginning of the overall documentation.

Explanation of the numbers [1] Daily check at the oil-sight glass. [2] Depending on the oil analyses.

Oil Supply for Slide Shoe Bearings Components: In general, each oil supply system consists of: • the oil tank with control monitors, • the circulation circuit with low pressure pump, double change-over filter, heat exchanger and oil heating,

• the oil storage system with the hydraulic accumulators, the high pressure pump and the respective control monitors, • the high pressure pumps and the oil flow dividers for supplying lubricating oil to the bearing shoes, • the low pressure pump for supplying lubricating oil to the axial guide,

The oil supply systems are preassembled, adjusted and checked in the manufacturer’s workshops.

Oil Supply for Slide Shoe Bearings

Lube Unit of Hydrostatic Slide Shoe Bearing - Thrust Bearing

Dismounting device for bearing shoes

bearing shoe with operating cylinder

hydraulic jack with hand pump for bearing shoe pos. 15° and 45°

Bearing shoe pos. 15°

Page 1

slideway

operating cylinder

position outside bearing housing

Page 2

bearing shoe

bearing shoe in outside position for lift up with crane

slideway

Page 3

slideway bearing shoe with support in pos. for lift up with crane bearing shoe plus support

bearing shoe pos. 45° Page 4