Internal Causes of Intermittent Phenomena of Hydraulic Universal Material Testing Machine
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The intermittent phenomenon is caused by two types of irregularities due to irregular load increase: 1. Internal causes of the hydraulic system of the hydraulic universal material testing machine; 2: External causes of the hydraulic universal testing machine fixture. The following Jinan Ruima engineers listed the customers for internal reasons.
1. Test and presence of gas in the cylinder and oil circuit
When the oil pump is first operated, the oil pump often has a small amount of air that cannot be removed or, in some cases, the air is sucked into the oil pump, then the output of the oil will be intermittent, so the load will be irregular, and the pointer will Produce shorthand. In order to determine this phenomenon, the side of the dynamometer can be removed and observed, and the oil flowing back to the tank by the oil delivery valve can be considered to be in normal operation if there is no turbulence. If the phenomenon of turbulence is found, in order to remove the air in the oil pump, the bleed screw on the oil pump body can be unscrewed or loosened, the oil pump is turned on, the internal gas is drained, and it is known that the emerging oil does not contain air bubbles, and then will be abandoned. The screws are tightened without oil leakage. The operation of the air in the discharge pump is only required at the initial installation, after the oil is changed or when there is gas inside.
There will also be air in the oil pipeline of the test machine, which will also affect the uneven rotation of the pointer. Discharge, that is, start the oil pump, close the oil return valve, open the oil delivery valve, raise the main piston to a certain distance, and then open the oil return valve, so that the oil from the oil pump through the working oil cylinder through the oil valve, back to the fuel tank. This cycle takes a while to drain the internal air.
2. There are impurities in the oil delivery valve.
When the unclean things are brought to the inside of the delivery valve with the oil (for example, iron film, oil residue, etc., it is easy to make the piston wear, and it also has an impact on the steady rise of the ruling. To remove these unclean things, the oil should be removed. Valve cleaning. Therefore clean hydraulic oil should be used.
3, the oil pipe joint loose oil leakage
If the tubing joint loosely leaks oil, it will also affect the smooth rise of the pointer. Therefore, check the tubing joint for leaks, and sometimes tighten it.
The micro-machine screen display control hydraulic universal material testing machine produced by Jinan Ruima is mainly used for the mechanical properties test of tensile, compression and bending of metal materials. After adding simple accessories, it can be used for cement, concrete, brick, tile, rubber and its products. Test.
The hydraulic universal material testing machine consists of a double-column double-screw cylinder under-mounted main engine and a piano-type oil source control cabinet. The oil pump adopts the Italian Mazuqi imported low-noise high-performance gear pump. The stretching space is located above the main unit, and the compression and bending tests are located below the main unit, that is, between the middle beam and the table. The adjustment of the test space is achieved by moving the middle beam, and the middle beam is lifted and driven by a chain. The computer fully automatic closed-loop control high-performance electro-hydraulic proportional servo valve is used to complete the tests of stretching, compression and bending of various materials. After the test is completed, the experimental results of FM, REH, REL, RPO.2, RP1, RM and elastic modulus E of the materials are automatically taken.