The Design And Realization Of Automatic Testing Machine For Gear Pump

As a kind of precision mechanical structure,gear pump is a rotary pump that transfers the liquid by the change of working volume caused by the internal gear rotation of the pump body.It has a wide range of applications in the hydraulic system.The gear pump tester introduces the automated test system into the testing process of the mechanical structure.Compared with the previous measurement of the mechanical size,the tester can perform automated and intelligent testing of its performance.While improving the accuracy of the test,it also improves the production efficiency.The design and implementation of the gear pump tester mainly includes three aspects.The first one is to overcome the accuracy of the flow test,to achieve a high-precision design of the flow test,thereby improving the test accuracy and accuracy of the gear pump tester.It is important to design and implement a complete and stable flow test hydraulic environment to lay the foundation for flow testing.These methods that sending the correct motor board control commands,setting the appropriate Schneider frequency converter parameters,using the proportional valve with high linearity to control the output pressure,and using the low friction gear oil as the test solvent are executed to provide stable flow output through these designs,and reduce the flow fluctuation by.Using the shunt design mode,using a high-precision flowmeter,the measurement accuracy is ±0.5%,and the repeatability is ±0.1%.The flow test accuracy is as high as possible.Based on the design structure of the gear pump,a reasonable flow test standard is formulated to analyze and solve the problem of greater tolerance of the low-flow gear pump and the problem of lower flow test data,and further improve and improve the accuracy of the tester.The second one is the design and implementation of an object-oriented automated tester.The components of the tester are all designed to be automatically controlled,including a hot-melt melter with serial communication control capabilities,providing the power of the hydraulic system.Designed with automatic control hydraulic switches,voltage output hydraulic sensors,current output flowmeters,optimization of easy-to-test oil circuit blocks,and automatically protected gratings provide the hardware basis for automated control.The data acquisition and automation control designed by the tester and the communication with the host computer are all achieved through the acquisition card.The DAQ and the electronic control box is designed through the USB-1208 FS data acquisition card and the circuit board to achieve data acquisition and automation control.This box is equipped with the appropriate power modules,lights,switches and control relays.The software is compiled by the object-oriented TestStand test software.The test software can automatically run to complete these tests,including the test to achieve pressure,the high-pressure test,the flow test and leak test.Also,the software can automatically display the test results saved and print test reports.During the process of designing and implementing the automatic control,the oil leakage problem of the tester was analyzed and solved.Finally,through analysis and comparison,the test data of the gear pump tester is analyzed using Six Sigma analysis tools.In the analysis process,the problems of the gear pump tester can be highlighted,and data support can be provided to trace its root cause.Through the Six Sigma chart analysis tool,the test data results are analyzed to find the potential problems of the gear pump tester.It is helpful to improve the test machine’s one pass rate,reduce the test time,and improve the test efficiency.