Description
Model: DIT**4, DIT**4, DIT**4, DIT**4
Type: C
Maximum impact energy:****0J,
****0J, ****0J, ****0J
Functions:
This type of machine is especially designed for drop-weight
tear tests of ferritic steels
Standards:
GB/T ***3, ASTM E**6, API RP 5L3
Features:
1. SIMENS PLC
controls and touch screen provide high reliability and
versatility.
2. Automatic
specimen feeding and automatic positing
3. Frame
structure is made of solid steel plate with high stability under
impact
4. Striker is
made of high strength steel plate with high impact resistance
5. Use chain
to lift striker with high precision in height
6. Self-lock
design for striker clamping
7. Full-closed
safety shield
8. Special
design tools for support change
Description:
This machine is constructed by main frame, striker, striker
lifting system, striker release/clamp device, specimen feeding
system, damping device, specimen collecting device, guard screen,
and control system.
1. Main
frame
The bottom plate is made of solid steel plate, mass is up to
***0kg. Anvil is located onto the center of the bottom plate.
Impact force onto the frame will rapidly transmit to the ground. As
the impact force applies to the center of the main frame which is
at the center of the foundation, foundation area is not so big
(3mx3m), after long use, foundation will not decline by vibration,
and horizontal level of the main frame will not change too.
The main frame is supported by four columns. Each column is
divided by upper and lower part. The lower part of the columns is
cone-shape cast iron; the upper part is high strength steel pipe.
Cone-shape of lower part has higher anti-decline ability than
cylinder-shape. Cast iron has stronger vibration resistance and
isolation, the vibration caused by impact force will not transmit
to the top plate, therefore, the main frame has not apparent
vibration for each impact test.
2. Striker
Striker consists of a few parts, which are made of separately
machined steel plate. It features high impact resistance ability.
Junction between each part is fixed by pin, jointed by high
strength screw bolt. Tup is made of alloy steel with good impact
resistance, little abrasion, long service life, and simple to
change. The weights are separate, easy to change. Connection
between weights is alignment pin with reliability.
3. Striker
lifting system
Imported servo motor is used for the lifting system, with
small size, light weight, high efficiency, low noise, and high
stability. Compared with common motor, servo motor is better in
accuracy, response characteristic, over-load resistance, speed
change performance, and torque characteristic. Use chain to lift
striker with smaller elasticity and higher accuracy than wire rope.
Chain has higher strength, higher abrasion resistance and safer
than wire rope. The lifting motor is located at the bottom of the
frame, easy to mount and maintain.
4. Striker
release/clamp device
It is specially design and will automatically lock after
clamping the striker. This device won’t open caused by gravity even
when the power is off. It is equipped with approach switch to
detect the position. If striker is not clamped, crosshead won’t
move. It uses AC electromagnet for release of striker, no need of
air supply, easy to mount and operate.
5. Specimen
feeding device
Use motor to feed specimen within 5 seconds, fast, reliable
and easy to operate. The frame is one body machined, without
welding, with high strength. The frame tightly fits to the support,
reducing the force on motor and extending the life of motor.
6. Damping
device
As the test standard requires only one drop can tear the
specimen, there is big residual energy after impact. Sometimes, the
residual energy may reach several thousand or even more than ten
thousand joules. Under low temperature impact test, the
residual energy may be much higher. In this case a damping device
is necessary and it will affect the service life of the impact
machine. We specially design one kind of hydraulic damping device.
Its structure especially the damping hole is strictly calculated
and proofed after plenty of tests. Single damper can absorb up to
ten thousand joules. The whole process is very stable, minimizing
the impact to the machine. Both dampers have the same performance,
extending the service life of the equipment.
7. Specimen
collecting device
This device uses motor to drive rubber belt for sample
collection after impact test. There I protection shield around the
belt. After finishing test, broken specimen will drop onto the
belt. After finishing each test, the collection device will run
automatically and bring the specimen out, which improves the work
efficiency and safety of operators>
8. Guard
screen
There are full closed guard screen around the main frame to
prevent broken specimen from splitting, also prevent operators from
entry to the frame inside. Guard screen has door limit switch. When
the door is open, the machine will lock automatically. Therefore it
will avoid wrong operation and guarantee the safety of
operator.
9. Control
system
Control system in this machine provides automatic operations
for striker lifting, zero positioning, specimen auto-feeding,
impact, and striker clamping, which greatly reduces labor intensity
and improves working efficiency and operating safety. Simens PLC
programmable controller is used for the whole control system, touch
screen is used for terminal operating interface, rotary encoder is
used for sampling and controlling the height. PLC features high
stability and reliability and strong anti-interference ability,
avoiding any fault operation and improving safety of operators.
Meanwhile this control system has alarm functions for such errors:
specimen is not in the right position, striker is not locked, and
guard screen is wrong, striker is not lifted to the correct
position.
Parameters
|
Model
|
DIT**4
|
DIT**4
|
DIT**4
|
DIT**4
|
|
Type
|
Type C
|
|
Maximum energy (J)
|
****0
|
****0
|
****0
|
****0
|
|
Minimum energy(J)
|
***0
|
***0
|
****0
|
****0
|
|
striker mass (kg)
|
**0
|
**0
|
**0
|
***0
|
|
Striker mass accuracy
|
±1%
|
|
Weight mass
|
*0kg/pc
(4 pcs, **0kg)
|
*0kg/pc
(*3pcs, **0kg)
|
*0kg/pc
(*2pcs, **0kg)
|
*0kg/pc
(*6pcs, **0kg)
|
|
Weight mass accuracy
|
±0.5%
|
|
Total weight of striker
|
***0
|
***0
|
***0
|
***0
|
|
Drop height(mm)
|
***5~***0
|
***5~***0
|
***5~***0
|
***5~***0
|
|
Velocity of drop (m/s)
|
5m/s~7.*7m/s
|
5m/s~7.*7m/s
|
5m/s~7.*1m/s
|
5m/s~7.*4m/s
|
|
Height resolution
|
0.1
|
|
Height accuracy(mm)
|
≤±*0
|
|
Hardness of tup nose
|
HRC*8~*2
|
|
Radius of tup nose(mm)
|
R*5±0.1
|
|
Hardness of support anvil
|
HRC*8~*2
|
|
Alignment accuracy of center of tup nose, specimen and
anvil center (mm)
|
≤±1.5
|
|
Support anvil span (mm)
|
**4±1.5
|
|
Specimen dimension (mm)
(length x width x thickness)
|
(**5±0.5) ×(*6.2±1.5) ×(***0)mm
|
|
Frame dimension (mm)
(length x width x thickness)
|
***0×***0×***0
|
***0×***0×***0
|
***0×***0×***0
|
***0×***0×***0
|
|
Weight
|
***0
|
***0
|
***0
|
***0
|
|
Power requirements
|
*-phase, *-line, AC **0V *0A
|
