Error diagnosis and elimination method of Sansi universal material testing machine - Database & Sql Blog Articles

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Error judgment and elimination method of Sansi universal material testing machine

In addition to the tensile test of materials, the Sansi universal tensile testing machine can also be used for compression testing, bending test, etc.

. The universal material testing machine has a wide range of applications, but do you know the source of the error during use, how to be effective

Do you know the error?
Below, Sansi engineers will sort out the reasons for the negative error of the universal test machine in the normal verification and eliminate it.

method:
1. The measuring force of the testing machine is not horizontally installed in the front-rear direction, so that the two bearings of the pendulum shaft are subjected to the axial component force.

The friction of the bearing is added. The magnitude of this friction increases with the increase of the level and increases with the load.

The indication error is a negative value. Its characteristic is that the relative error of the dials of each level decreases with the increase of the load. Test machine force measurement part

The axis of the non-horizontal force measuring piston is not passed through the center of the square iron blade, increasing the radial component force, increasing the force measuring piston and the measuring force

The friction of the cylinder, the error caused by the indication is a negative difference. Its characteristic is: the relative error of the dials of all levels is the same, in the same

The relative error of a scale range is also the same.
Remedy: Place the box level with the scale value not less than 0.1‰ on the front and side of the upper part of the pendulum.

The method of horns under the seat is adjusted to within 0.2‰mm.
2. As the belt of the force measuring cylinder falls off or the belt is too loose, the friction between the force measuring piston and the cylinder is too large, resulting in a negative error.

difference. Remedy: Install the belt or adjust the tightness of the belt.
3. Load indicating mechanism: the driven pointer spring piece is too tight, the spring piece on the push rod rests on the push rod, and the pointer main shaft rod bearing

There are rust, dirt, dirt in the pulleys, rollers and iron grooves. The friction caused by the existence of these causes causes the indication error

difference.
Remedy: Adjust the position of the spring piece, remove the indicator mechanism and the drawing mechanism, and clean it.
4. The pendulum shaft bearing is rusted and dirty, and the swinging rod is affected by the frictional resistance when it swings, resulting in negative indication error.
Remedy: Due to the severe vibration caused by the fracture of the test piece, the force tester of the material testing machine is sufficient on the swinging shaft of the connecting rod

The knife is disengaged and the lever ratio is changed to cause a negative error. Since the knife pad may jump to the left or to the right, sometimes it is also

Will produce a positive error.
Remedy: Remove the cover bridge bolts, lift the connecting rod to check the knife pad and the blade for damage, if it is installed without damage

.
5. Since the safety limit switch is activated in advance or the upper limit of the force measuring link is improperly adjusted, it is shown in the dials of each level.

The relative error of the value only produces a negative overshoot at the last point.
Remedy: Check if the baffle mounted on the force measuring rod is in advance contact, and should be re-adjusted to make the pointer turn one week.

After that, the maximum load of each level is 3%-5%, and the limit switch works again.