Concrete test hammer
Concrete testing with the Original Schmidt test hammer is
the most frequent used method for non-destructive concrete
testing worldwide.
For every demand and specific test application, Proceq
offers
the right concrete test hammer.
Original Schmidt concrete test hammers are available in
models
with different impact energies in order to meet the needs to
test a wide range of material types and sizes.
Our types N, NR, L and LR are best-suited and specially
developed
for assessing the quality and compressive strength
characteristics of concrete with the range of 10 to 70 N/mm2 (1450
to 10152 psi).
Versions incorporating paper chart recorders (LR and NR) can
automatically register the rebound values on a paper strip
chart.
Proceqs type ND and LD Digi-Schmidt test hammer measure the
rebound values through an electronic method and allows the direct
reading of the test results in digital form.
Technical properties 1) nominal dynamic energy: 2.207J 2)
rigidity of impact spring: 7.85N 3) hammer stroke: 75mm 4) impact
hardness: HRC59-63 5) max static friction of pointer system:
0.5N-0.8N 6) average calibration of steel anvil: 802 7) size:
60*280mm 8) weight: 1Kg
Structure of rebound hammer HT225 Rebound Hammer mainly consists
of impact system, reading system and housing opponents etc.
Please refer to Picture 1, Structure of Rebound Hammer. In
Picture 1, the hammer has finished the impact performance and the
pushbutton has locked the mechanism(i.e. reserving the rebound
reading).
Page 1
CONCRETE TEST HAMMER
In the impact system, the impact plunger transfers the dynamic
energy of hammer to the concrete test
sample, and rebounds to the hammer a part of dynamic energy
after impact to make hammer rebound a certain distance. Impact
spring mainly stores energy and gives energy to hammer, so the
hammer is not only the carrier of energy but also the element to
connect impact system and reading system; that is to say, the
indicative rebound reading of pointer in the reading system is the
moving distance caused when hammer rebounds and drives the impact
plunger after it impacts the plunger.
The reading system is fixed to the housing and keeps with the
impact system a relative position and movement relation. The
compression spring drives the disk to the pre-established position,
bringing back the impact system in the state of non-elasticity, and
at the same time, the pointer is reset to zero.
The trip screw of rear cover is used to control the hammer
stroke(separation point) and take-off point. So once being set, the
height of trip screw cannot be changed arbitrarily.
Note
Usually, staffs who are not trained specially should not verify
the standard conditions of hammer by oneself. Therefore, the
specification do not introduce in detail of the operation and steps
of verifying standard conditions so as to not cause to bad
consequence.
Below are the photos of the hammer. Weight: 1.9KG Mini
order:10PCS Page 2
