Explanation of the characteristics of conventional universal machine and three-closed loop universal test machine

Previously, our company's technical staffHydraulic universal testing machineThe instruments and equipment with manual hydraulics are described in detail. The following is an explanation of the characteristics of conventional electronic universal testing machines and three-closed-loop electronic universal testing machines.

Conventional electronic universal testing machine:

This type of test machine is the mainstream product of today's universal material test machine. It uses servo motors as the power source and lead screws and wire masters as actuators to realize the speed control of the moving beam of the test machine. It is simple to operate and has low requirements for the tester. The test stroke can be customized as needed. Although the control method is relatively single and there is only one control method for speed, its control accuracy and control range are very high and wide. Taking the Riggel test machine as an example, its speed adjustment range can reach 0.001mm/min~1000mm/min, stepless speed regulation, and control accuracy can reach 0.5%. It is easy to achieve small-tonnage models. If the friction coefficient is used, the full value load is only 5N. It has great configuration flexibility and can be equipped with sensors, fixtures and accessories of different tonnages as needed to achieve multi-purpose one machine, completing the functions of pulling, pressing, bending, shearing, peeling, tearing, friction coefficient, torsion, etc. Looking at the relevant standards for plastic mechanical properties inspection, almost all the requirements for the control method of the test machine are speed control. Therefore, whether in terms of the control method, speed range, test stroke and tonnage of the test machine, this type of machine is for plastic mechanical properties inspection.

Three closed-loop electronicsUniversal Material Testing Machine:

This type of test machine has the characteristics of a conventional electronic universal test machine with a wide speed range, a large test stroke and flexible configuration, and has the advantages of force, displacement and deformation control of electro-hydraulic servo test machine. Therefore, it is a test machine with better performance, but because the machine stability during force control and deformation control is closely related to the rigidity of the host and the rigidity of the sample. Generally, the tonnage of plastics test machines is small, so the main machine is less rigid, and the sample itself is not too rigid. Therefore, there are few models of this type of test machines below 10KN, while models below 10KN are commonly used in plastics. As mentioned earlier, the stability of this type of machine is related to the sample. If the sample is single, the test method is relatively single and can be used. Otherwise, the control parameters of the test machine (i.e., the conventional P, I, and D parameters) need to be adjusted at any time. This is almost difficult for non-automatic testers to imagine. Therefore, from a general perspective, in addition to specific requirements for the control method, it is not easy to choose to test plastic materials.