Application Range

This tester mainly adopts sliding friction to evaluate the load-carrying capacity of lubricants under extremely high point contact pressure, covering three key indicators: maximum non-seizure load PB, weld load PD, and mean Hertz load ZMZ. It can also conduct long-duration anti-wear tests for lubricants, measure friction coefficients, and record curves of friction force and temperature.

 

Applicable Standards of This Tester:

GB/T12583-98 Determination of Extreme Pressure Properties of Lubricants (Four-ball Method)

GB3142-82 Determination of Load-Carrying Capacity of Lubricants (Four-ball Method)

SH/T0189-92 Determination of Anti-Wear Properties of Lubricating Oils (Four-ball Method)

SH/T0202-92 Determination of Extreme Pressure Properties of Lubricating Greases (Four-ball Method)

SH/T0204-92 Determination of Anti-Wear Properties of Lubricating Greases (Four-ball Method)

Specification

Item	Specification
Test Force Range (stepless adjustable)	60N ~ 10kN
Relative Error of Test Force Indication	±1%
Friction Force Measurement Range	0 ~ 300N
Friction Force Measurement Error	±3%
Spindle Speed Range (stepless adjustable)	200 ~ 2000r/min
Spindle Speed Error	±5 r/min
Friction Pair Temperature Control Range	Room temperature ~ 75℃
Friction Pair Temperature Control Error	±2℃
Test Time Control Range	1 second ~ 999 hours
Spindle Revolution Control Range	1 ~ 99999999 revolutions
Test Steel Ball	Φ12.7mm
Overall Dimensions	1200 × 870 × 1700 mm
Weight	600kg

 

Operating Conditions

a) Ambient temperature within the range of 10°C to 35°C;

b) Relative humidity not exceeding 80%;

c) Install in an environment free of vibration, corrosive media and strong electromagnetic field interference;

d) Fluctuation of power supply voltage shall not exceed ±10% of the rated voltage, frequency fluctuation shall not exceed 2% of the rated frequency, and unbalanced voltage of three-phase power supply shall not exceed 10V.

e）The equipment shall be correctly mounted on a stable foundation with the horizontal tolerance not greater than 0.2/1000.

 

Basic Configuration

4.1 Main tester unit: Consists of machine base, spindle drive, piston loading system, electrical control cabinet, etc.

4.2 Full-digital electrical measurement & amplification control system and liquid crystal display system: Real-time display of test force, friction force, rotational speed, test revolutions, time and temperature.

4.3 Load sensor

4.4 Windows-based computer data processing software

4.5 Computer: DELL or Lenovo brand computer

4.6 Printer: HP color A4 printer

4.7 High-precision measuring microscope: Model 15J from Shanghai Optical Instrument Factory, magnification 25×

4.8 1 piece of high-temperature platinum resistance sensor

4.9 Test friction pairs:

a) 1 set of high-temperature friction pair oil cup;

b) 1 set of room-temperature friction pair oil cup;

c) 200 pieces of special steel balls for four-ball tester.

 

Functions of Measurement & Control System and Test Software

(1) Supports test methods including national standards GB/T12583-1998 (Determination of extreme pressure properties of lubricants) and ZB E 34007-87 (Four-ball anti-wear test method);

(2) Friction force, peak value and load: the indication error is ±1% of the reading starting from 20% of each range, with automatic calibration available;

(3) Real-time display of motor revolutions (rotational speed) and test duration;

(4) Multi-protection functions for friction force, load, motor revolutions and other parameters;

(5) High-speed sampling and real-time recording of friction force-time and load-time test curves;

(6) Variable-structure PID control algorithm adopted to regulate the loading process; constant-speed control error ≤5%, pressure-holding control error ≤0.5%;

(7) When the test force exceeds a preset upper limit, the system will automatically activate overload protection and take corresponding measures promptly to safeguard the tester.

(8)Test data is managed via data files; all test data and curves can be saved, and printed test reports comply with the requirements of national standards.