Ada Schmidt Hammer 225 А00191 [23/36] Schmidt hammer 225

Schmidt Hammer 225

MEASUREMENT FOUNDATION

Working principle

Test hammer the stability of technical specication, reliability, consistency, rebound method for ensuring the accuracy of

testing the compressive strength of concrete is essential.

Therefore, the technical parameters and specication of test hammer should be standardized. Normal Impact energy is

2. 207N.m of concrete test hammer basic technical specication are as following:

Normal Impact energy: 2. 207N. m (0. 225kgf. m)

it is main design parameters of the instrument, when the test hammer rebound at level, bomb attack tension spring

stretch length 75mm which has the kinetic energy. Although it can’t directly test Hammer kinetic energy of the instru-

ments, but, through controlling the stiffness and the standard tensile length of tension spring, and related precision of

the parts, may also be to control kinetic energy purposes.

Strike tension spring stiffness: 7.84N (0.80kgf) /cm.

Stiffness for tension spring will directly affect the nominal kinetic energy size of test hammer, usually through the spring

testing machine strict inspecting the technical parameters, but also can be inspect it according to “JJG817-93” standard

stated special spring testing device.

Strike hammer stroke: 75mm (Namely: strike tension spring stretched the

length of the standard).

Generally, depend on assembly and adjusting to ensure the technical requirements. Instrument self-test method: adjust

the bolt length out on the end cover, when the strike hammer shoot out (namely: unhook), the scale mark of pointer

slider and scale 100 mark of rebound value graduation scale is superposition, this time the length out for strike tension

spring should be 75mm.

Working length of strike tension spring: 61.5mm