Poor solenoid terminal
The terminal joints of the enamelled wire of some horn internal solenoid coils are crimped and connected by aluminum metal rivets, which are not firmly welded. If the insulating paint on the end enamelled wire is not treated cleanly or the rivets are not firmly crimped, it is easy to produce virtual connection fault, resulting in poor operation of the horn. This failure is the cause of horn quality and can only be replaced.
The seal is not tight and easy to be damp
Although the interior of the horn of the concrete mixer truck is sealed, if the sealing is not tight, when cleaning the concrete mixer truck, it enters the fog or there is water vapor in the air of the internal space, which is easy to cause the contact damp and can not work normally.
If you press the horn for a long time, it is easy to cause the horn contact ablation to produce impedance, the current flowing through the electromagnetic coil is weakened, the electromagnetic suction of the concrete mixer is reduced, and the armature cannot be attracted to drive the diaphragm to vibrate normally, resulting in hoarse pronunciation or even no sound. However, when the horn is continuously pressed, if the instantaneous strong current passes through the impedance, it can still work normally, so it will be good and bad from time to time.
The horn of the concrete mixer truck is equivalent to the mouth of human beings. If the horn fails, it will not be able to make sound and attract other people's attention. The failure of the horn is mainly due to the loose sealing of the electromagnetic coil terminal, easy to be affected by moisture, contact ablation and other reasons. When operating the concrete mixer, do not adjust the hydraulic system of the mixer at will. Clean the ponding and sundries in the mixing drum before use. Check whether there is ice before starting in winter,