> The domestic product 55 inches
and 46 inch 双模vulcanizing machines mostly use the JQLX series
three-phase asynchronous motor which the Guangdong Shunde produces.
This series electric motor has rises up the kinetic moment, and
is loaded with the direct current 圆盘?electromagnetic brake.
Specially makes for the necessary tire vulcanizing machine.
This series electric motor besides has the ordinary three-phase
asynchronous motor principle of work, different occupying to
additionally builds a set of direct current 圆盘?electromagnetic
brake.
圆盘?the electromagnetic brake principle of work is:
The brake work quota is with the electric motor consistent.
Brake with sur- direct-current power supply, when the electric
motor turns on the electric current, the brake coil should also
electrify, the electro-magnet 衔铁 will attract immediately, and
will cause the embedment at the electro-magnet interior spring
compression, will cause the system 动件 and 衔铁 withdraws with
the friction plate, the system 动件 will accompany the tooth axle
sleeve to rotate together with the rotor. If the electrical
machinery dump brake should simultaneously the power failure, the
electro-magnet lose the electromagnetism suction, the spring impels
衔铁 to contract the system immediately 动件 to have the friction
moment, checks immediately the electric motor rotor the jail.
Under the breakdown phenomenon and its solution which frequently
meets in the production process makes a brief narration on this series
electric motor.
1 JQLX series electric motor common breakdown
and service method
After 1.1 electric motors put through
the power source not to revolve
This breakdown should consider from following several
aspects that,
(1) inspects the supply voltage value. When enters the
electric motor connecting box place voltage value is smaller than
rated voltage value 90%, the electric motor cannot start.
(2) inspects the brake contact device and the host electrical
machinery contact device whether also does close. Must guarantee
two contact devices movements the synchronism, otherwise the electric
motor is at the stopping.
(3) in electric motor contact device and in brake contact device
closed situation, survey direct-current output voltage.
(4) when above (3) the condition all satisfies in the situation,
inspects the electro-magnet with the feeler gauge and 衔铁 the air
gap. Is bigger than 2mm when the air gap, can cause the spring
working length to increase, under the identical magnetic potential,
can cause the air gap magnetism dense remarkable drop, is serious when
(is bigger than 2mm) to be able to enable 衔铁 to attract. The
common air gap size below 1.5mm is suitable.
(5) works as (3) (4) in the condition satisfied situation, are
the brake coil interior partially short-circuits, enables the
electro-magnet magnetic force 衔铁 to attract, the electric motor
still was at the stopping.
1.2 electric motors in the top die upright
position movement, after apply the brake to move in a big way
After discovered this phenomenon, should promptly adjust
the electro-magnet with 衔铁 the between gap, guaranteed the
electric motor the machine 上横?glides down after applying the
brake is not bigger than 15mm. If 摩擦?the attrition is
serious must carry on the replacement, guaranteed applies the brake
reliability and security.
1.3 electric motors after meet the person
three-phase power source, the air switch trips
(1) surveys the electric motor three-phase winding with
the 500V megameter to the cabinet insulation resistance value.
If the resistance value is lower than 0.5M Omega, must carry on
dry processing to the electrical machinery. After achieved the
stipulation request only then puts into the use.
(2 after) if removes (1) to be possible, opens the electric
motor star connection public end, carries on the survey with the 500V
megameter to six taps one by ones. Inspects two alternates with
the insulation resistance value, if 相间短路 can appear the
breakdown 1.3 phenomena.
After 1.4 electric motors turn on start the
power source, sends out humming sound the sound, the rotational speed
is slow
This phenomenon generally is lacks creates. Should
inspect following several aspects.
(1) first inspects the fuse whether blows a fuse.
(2) control motor contact device three-phase contact whether
also does close.
(3) with 500V megameter inspection electric motor
three-phase winding whether shuts.
(4) inspects the three-phase power source each component
connecting lead screw contact situation (wire joint place to have
oxide compound to the electrical machinery connecting box between,
oily dirt or joins screw not to screw tight).
1.5 electric motors the magnitude of current
surpass the nominal current in 开 the mold generating process to
be very many, or a start on directional infinity, but the electrical
machinery does not revolve
(1) if when gathers in the mold process quickly
approaches the most low point, has the electric current suddenly to
aim at the infinity, generally has following two factors.
(1) operator excessively is high in the pattern making process
the capsule decided but not yet announced pressure setting, creates
the load to increase, the electric current increases sharply.
(2) transports the medium to the capsule in other valves (water,
two water, in cold water) divulges, causes the capsule internal
pressure to increase, causes the electric current to increase sharply,
is unable to continue to gather the mold.
(2) if electric motor quite is all high when any position
revolution electric current, should inspect following two aspects
factor.
(1) inspects in the speed reducer the lubricating oil, the
lubricating oil too few, in the oil has the moisture content to mix
into, or the oil emulsified the deterioration to be able to cause the
electrical machinery revolution electric current to increase.
Should supplement the lubricating oil, the platoon bleeds off
the moisture content, trades the deterioration lubricating oil.
(2) electrical machinery rotor cage strip break also can cause
the electric motor electric current to increase, when is inferior to
will process can accelerate other cage strip breaks, the time one is
long can burn down the electric motor. The common cage strip
break may use welding method processing.
(3) also has one kind is the mechanical drive part has catches
the phenomenon, also causes the electrical machinery electric current
to increase. |
