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Common problems and troubleshooting methods of Brinell hardness tester | Hardness tester FAQ
Author:admin    Released in:2019-03-26 11:23:48    Written words:【Big】【In the】【Small
Abstract: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.

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.

This article takes the HB3000 Brinell hardness tester as an example to talk about some common faults and troubleshooting methods.

1. The load error exceeds ±1.0% or is unstable; the cause and troubleshooting of such failure:

(1) The blade of the force point is loose, and the blade should be adjusted and tightened;

(2) The wear of the blade and the fulcrum of the force point will increase the load error to varying degrees, and the blade should be repaired;

(3) The position of the adjustment block on the load lever is not appropriate, and it can be moved forward or backward according to the situation.

(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 the oil should be replaced or replaced.

(5) The loading is not stable, there is shock vibration phenomenon, and factors causing instability may be excluded.

2. The loading speed cannot be controlled within the specified time; the loading speed is too fast or too slow, mainly because the viscosity of the gear unit 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; the cause and troubleshooting of this failure:

(2) The surface of the steel ball is not smooth or the diameter exceeds the tolerance, and the qualified steel 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. The weight should be rubbed against the back cover of the hardness tester. Check whether the lifting ring is hung on the key cutting edge and whether the hanger boom is straight. Otherwise, the lifting ring should be hung on the key cutting edge. Hanger

(5) The verticality of the spindle and the test platform, the coaxiality between the spindle axis and the axis of the lifting screw 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 the cause of this failure and troubleshooting:

(1) The push button switch ejector pin is too long, the steering switch A, B contact and A1, B1 contact can not be disconnected, the ejector pin length should be adjusted and fixed; (2) the reversing switch installation position is improper, the movable baffle can not When the pin on the reversing switch is touched, the reversing switch is not reversed, and the installation position of the reversing switch should be adjusted.

5. The hardness tester load is all 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 or replaced with a new one.

6. When the button switch is pressed, the hardness tester does not work, but there is a squeaking current sound; the cause of the fault is that the motor is out of phase, should check whether the power supply is normal, whether the power plug is plugged in, whether the cable has an open circuit, and whether the power switch is Integrity, whether the motor wiring is firmly connected, whether the motor coil burns out a group and whether the switch contacts are in good contact, etc., should be excluded according to their conditions.

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