The advantages and disadvantages of hydraulic system of hydraulic universal tester

one.Hydraulic universal testing machineWhat are the characteristics of the gear pump used?
Answer: The gear pumps commonly used by hydraulic universal testing machines such as Japan's Fujitsu and Italy's Mazuchi are all internal meshing gear pumps.
Features: ① Small flow pulsation, ② Low noise
Disadvantages: The working pressure is low, and the rated pressure of the pump can only reach 30MPa.
2. What are the characteristics of the plunger pump used in hydraulic universal testing machines?
Answer: The commonly used plunger pump for hydraulic universal testing machines is a swash plate axial plunger pump with 5 plunger or 7 plunger.
Features: ① High working pressure, generally 20~40MPa, can reach 100MPa.
② Large flow range because the flow rate can be increased as long as the plunger diameter is appropriately increased or the number of plungers is increased.
③ It is easy to implement variables, and you can change the swash plate angle or change the pump speed to realize variables. ④ The main parts are pressurized and have a long service life.
3. What is the definition of patented technology for servo pumps for hydraulic universal testing machines? What are the advantages of patented servo pump technology of hydraulic universal testing machine over servo valves?
1. Definition: The patented servo pump technology is composed of a servo motor and an oil pump. The servo motor is a control unit and the oil pump is an execution unit. The flow rate of hydraulic oil and the system pressure depend on the motor speed. The application of servo pump control technology in electro-hydraulic servo universal testing machine is our company's innovative technology, national patent, and complete intellectual property rights. Leading a new direction of hydraulic testing machine control technology.
2. There are three main advantages:
①. Stable and reliable Due to the perfect technology of servo motors, stable and reliable performance, the perfect oil pump technology and stable and reliable performance, the characteristics of the patented servo pump technology are stability and reliability. The failure rate of hydraulic control systems may tend toward zero.
②. High control accuracy The control accuracy of stress rate, stress maintenance, strain rate, strain maintenance, and beam displacement rate are all better than ±0.2%. This is unimaginable for other test machines.

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