The impact of incorrect installation of the electronic tension machine
The electronic tension machine is widely used not only in enterprises, scientific research departments and universities, but also as an important testing equipment by the quality and technology department.
The manufacturing precision of the electronic tension machine is important, but the installation accuracy is equally important, because the inaccurate installation will bring many disadvantages to the later use. The universal testing machine is generally divided into two parts: the afterburning part; the measuring part. This article gives an introduction to the error caused by the incorrect installation of the test.
The error of the partiality of the afterburning part:
(1) When measuring the elastic modulus E of low carbon steel, the error of the two dial gauges of the butterfly extensometer is very large, and sometimes one of the tables rotates in the opposite direction. The main reasons for this problem are: universal test The verticality of the machine is not guaranteed, resulting in the eccentric stretch of the stretched sample. The reverse rotation of the hands is due to poor pressure regulation of the test machine and serious oil leakage in the hydraulic system.
(2) If there is an error in the verticality of the testing machine, the sample cannot be axially stretched, so the experimental data performed cannot guarantee the accuracy.
(3) The verticality error of the testing machine will cause friction between the single-side roller and the fixed column of the movable table, and the accuracy of the load data cannot be guaranteed.
(4) The verticality error of the testing machine will cause the working cylinder piston to rub against the one side of the cylinder wall, which will also affect the life of the testing machine and the hydraulic system.
(5) The verticality error of the testing machine will cause friction noise when the chuck lifting worm under the testing machine rises vertically, which will increase the wear of the mechanism.
(6) The problem of the verticality of the testing machine also affects the left-hand automatic drawing device, because the left-hand automatic drawing device is the wire rope and the guiding roller transmission which are lifted and lowered by the main body of the right testing machine, and the Zui is mainly related to the transmission load. The horizontal rack is related, because the verticality of the testing machine can not guarantee the accuracy of the load, indirectly affecting the automatic drawing device, so its tensile curve can not accurately reflect the actual situation.
The influence of the installation error of the force measurement on the experimental results:
(1) Firstly affect the oil pipe connection between the afterburning part and the force measuring part. The manufacturer of the electronic tension machine basically has a limited position for the forming angle of the forming and returning oil pipes, so the afterburning part and the measuring part are The tubing connection will be affected by the positionality and verticality deviation of the installation. The first effect is the combination of the tubing and the inlet and return valves and the cylinder, and secondly the impact of the interface on the oil leakage. Because the test machine leaks oil, the voltage regulation performance of the test machine cannot be guaranteed. The accuracy of the data of the next multi-point strain measurement for the bending test constant load cannot be guaranteed. The oil inlet valve cannot be completely closed. To ensure the voltage regulation, the oil inlet valve must be ensured. Slightly open to ensure that the oil intake is equal to the oil leakage, which requires frequent switching of the oil inlet valve, which aggravates the wear of the valve fj, thereby aggravating the oil leakage phenomenon. The larger the load, the more serious the oil leakage phenomenon, forming a vicious circle. The difficulty of completing the test is increased.
(2) The error of the verticality of the installation on the left side will affect the problem of zero adjustment before the test machine is working, because the adjustment of the balance pendulum needs to ensure the verticality of the pendulum, affecting the angle of the lever that pushes down the horizontal teeth, and thus affecting the force value. The size also affects the elevation angle of the horizontal rack.
(3) Affect the correct reset of the force measuring pointer. The thrust of the piston of the force-measuring cylinder against the force-transmitting rod will cause an error in the installation accuracy of the test machine. 4. The electronic tensile machine is the main equipment for the experimental teaching of material mechanics, and its price is relatively expensive. And as a fixed asset, with a long life cycle, you should not just find a few masonry, simply install things. The installation of the universal material testing machine should have a qualified construction team, and the technicians of the manufacturer should be on hand to conduct the installation test machine as a major event.
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