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Appendix 1- Common Mechanical Failures and Maintenance
Methods of Apparatus
When the apparatus conducts recoiling test, if the display number does not change or the
rebound value has deviation, this condition is usually caused by mechanical failure. The
solutions for common mechanical failures of rebound apparatus are listed in the following
table:
No.
Failure Condition
During rebound
apparatus test, pointer
I
block 22 stops at the
initial place without
moving.
Pointer block 22 is
brought up before
II
recoiling, and can not
indicate the rebound
value normally.
During recoiling
process, pointer block
III
22 shakes, moves up to
a certain place and
stops there.
Recoiling hammer mass
IV
10 launches too early.
Rebound apparatus can
not rebound and
V
recoiling hammer mass
10 can not move up.
Recoiling hammer mass
VI
10 is reluctant to launch
or can not launch.
Impact plunger 14 can
VII
not be extended, can
not be used.
Cause Analysis
1. Compared with pointer piece 20
of pointer block 22, the field angle
of guide rod 26 is too small.
2. Pointer piece 20 is broken.
1. The field angle of pointer piece
20 on pointer block 22 is too big.
2. Tightness between pointer block
22 and guide rod 26 is too loose.
pointer block 22 rubs or bumps
spring back hammer body 7
1. The end of paw 3 becomes small
obtuse angle.
2. Part of the end of recoiling
hammer mass 10 is broken.
1. The paw spring 28 of paw 3 falls
off and does not work;
2. The end of paw 3 is broken.
3. The end of paw 3 wears from an
accurate angle to a big obtuse
angle.
1. The bulge part of the end of
paw 3 touches the surface of
recoiling hammer mass 10
2. The end of paw 3 is acute angle
Push button 6 is loose, the small
spring inside does not work.
Maintenance Methods
Remove pointer block 22, and
enlarge the field angle of
pointer piece 20 appropriately
Remove pointer block 22 and
change pointer piece 20
Remove pointer block 22 and
wrench the field angle of
pointer piece 20 smaller
appropriately
Remove pointer block 22,
adjust the friction between
pointer block 22 and guide rod
26 (0.65±0.15n)
File the upper surface or two
shoulders of pointer block 22
appropriately with a mall file
File the end of paw 3 to right
angle with a file;
Turn the recoiling hammer
mass 10 to a certain angle or
change it.
Install paw spring 28, or adjust
its elastic force and operating
position well.
Change paw 3；
File the paw end of paw 3 to
right angle.
File the bulge part of the end
of paw 3 about 1mm upwards;
File the end of paw 3 to right
angle.
Hold and press the tail hood
and twist it 30 times, to make
guiding flange move
downwards, and adjust the
button spring well and screw
up push button 6.
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