The Brinell hardness tester is widely used in the production of Brinell hardness values ​​of unhardened steel, cast iron, non-ferrous metals and soft bearing alloys due to its ability to measure a wide range of hardness values. The instrument world network here takes the HB3000 Brinell hardness tester as an example to talk about some common faults and troubleshooting methods.
1. Load error exceeds ±1.0% or is unstable
Causes and troubleshooting of such failures: (1) The blade of the force point is loose, the blade should be adjusted and tightened; (2) The wear of the blade and the fulcrum will increase the load error to varying degrees, and the blade should be repaired; (3) Load lever The position of the adjustment block on the upper part is not suitable. It can be moved forward or backward according to the situation. After adjustment, it is fixed tightly. (4) The compression spring is rusted, which increases the friction with the pressure shaft and the main shaft bushing. The rusted part should be cleaned and Protective oil or replacement. (5) The loading is not stable, there is shock vibration phenomenon, and factors causing instability may be excluded.
2, the loading speed can not be controlled within the specified time
The loading speed is too fast or too slow, mainly because the viscosity of the gear unit oil is too small or too large. The gear unit should be cleaned and the oil for the gear unit should be replaced.
3. The measured hardness value is inconsistent with the standard hardness block indication.
Causes and troubleshooting of such failures: (1) Hardness tester installation is not level, the hardness tester should be adjusted to the level; (2) The surface of the steel ball is not smooth or the diameter exceeds the tolerance, and the qualified ball is selected by using the micrometer. (3) The error of the indentation measuring device is too large, and the allowable error of the indentation measuring device should be adjusted to make it ≤±0.5%; (4) the weight cannot be placed vertically, and the weight and the back cover of the hardness tester should be inspected. Whether the lifting ring is hung on the key blade and whether the hanger boom is straight, otherwise the lifting ring should be hung on the key blade and the straight hanger hanger; (5) the verticality of the spindle and the test platform, the spindle axis and the lifting screw If the coaxiality of the axis is too poor, the verticality of the spindle and the test platform, the coaxiality of the spindle axis and the axis of the lifting screw should be analyzed according to the situation.
4, the hardness tester repeatedly loaded and unloaded
Causes and troubleshooting of such failures: (1) The push button switch ejector is too long, the steering switch A, B contacts and A1, B1 contacts can not be disconnected, the length of the ejector should be adjusted and fixed; (2) change If the switch is not properly installed, the movable baffle cannot touch the pin on the reversing switch, causing the reversing switch not to change direction. The installation position of the reversing switch should be adjusted.
5, the hardness tester load is fully stopped
The cause of the failure is that the contact point of the reversing switch has burns and ablation, resulting in poor contact at the contact point. The contact point should be cleaned and polished or replaced with a new reversing switch.
6, the button switch is pressed, the hardness tester does not move, but there is a squeaky current sound
The cause of this fault is that the motor is out of phase. Check whether the power supply is normal, whether the power plug is plugged in, whether the cable is open, whether the power switch is intact, whether the motor wiring is firmly connected, whether the motor coil burns out and the switch is touched. If the point contact is good, it should be excluded according to its situation.
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