Dynamical hydraulic pump tries proved recipe law and test equipment

1, 0.

Requirement of method of original trial of 85pmax pressure concept is being done run close, discharge detects when waiting for function to experiment, the product has below condition of Pmax of highest actuating pressure, change hydraulic pump relief valve to complete already open right now, be in discharge to be of 0 break shed position, cannot experiment at all, and burn pump easily. Hydraulic pump changes to the open of relief valve to avoid when the experiment, before the experiment, must will turn to hydraulic pump relief valve to be locked up dead. This kind of practice was equivalent to undertaking adjustment to hydraulic pump, this method both neither is consequently scientific, also do not accord with the state that assemble a car, also cannot detect well and truly at the same time a product performance characteristics. Because this put forward 0.

85pmax pressure concept, namely the product is in 0.

Make running closing to detect with discharge wait for function to detect below condition of 85 times highest pressure, change hydraulic pump to relief valve right now won't open, such detecting the performance that give just reflected the true condition that turns to hydraulic pump well and truly. 2.

2, method of air-tightness trial original trial asks without air-tightness experiment, make clear through many experiment, air-tightness experiments can the assembly between the sealing that accurate, reliably report changes hydraulic pump to weather strip and each spare parts quality, and experiment handy, feasible, cost is low, popularize application easily. 2. 3, the oil that dependability experiments is lukewarm the use operating mode that turns to the use operating mode of hydraulic pump to use pump than average project wants complex much. When using, turn to hydraulic pump to often be in the mixed operating mode with rotate speed, changeful pressure to fall, oily lukewarm change is acuteness and range is bigger. Together with is in turn to hydraulic pump to gave oily mouth place to install the reduce expenditure hole with very small aperture, make release of spare flow overflow exceeds, return oil pocket directly, in change direction pulmonary circulation is formed inside hydraulic pump, this makes change hydraulic pump to calorific phenomenon should get badly than general pump much. In the meantime, because accept structural restriction, turn to hydraulic pump to be in truckload go up to be installed commonly at engine by, environmental temperature is very high, turn to hydraulic pump to give out heat consequently more serious. And power gets lost the oil in the system fluid is very few, it is 1 ～ 3L commonly, its quantity of heat sends out not easily. Accordingly, turn to the performance characteristics of hydraulic pump and life for well and truly assessment, its experiment oil is lukewarm it is advisable to be controlled in 70 ℃ . 2.

4, break the experiment method that general pump consults in shedding method of trial original trial, put forward to break shed an experiment. Because assembly of dynamical steering gear all has a powerful person of journey discharge carry on one's shoulder commonly, when turning to ultimate position, open of a powerful person of journey discharge carry on one's shoulder, make turn to hydraulic pump to be in uninstall condition. Although do not have a powerful person of journey discharge carry on one's shoulder, it is certain to have as a result of the inevitable meeting inside assembly of dynamical steering gear inside leakage rate, turn to hydraulic pump to also won't be in consequently shed position. Especially blade pump was not broken almost shed ability. Accordingly, should cancel to shed test project. 2.

5, change experiment of rotate speed concussion is well-known, as a result of the special use operating mode that change direction, the car is in travel process, turn to hydraulic pump to be in successive and overweighted condition far from possibly. Contrary, the car is in travel process, its travelling speed is changing ceaselessly, and turn to a system to be in at any time again the orbit go with ensure the car is pressed fair, as a result of the reason of road surface, turn to a wheel ceaseless also get the converse concussion of road surface, consequently change trains of car travel process bears ceaselessly to pound load to hydraulic pump. To make experiment operating mode and use operating mode photograph actually to agree, make test data reflects the service life that turns to hydraulic pump well and truly, because this put forward the successive overload in method of will original trial,experiment instead changes rotate speed pounds an experiment. 3, actuating device of brief introduction of testing stand structure uses communication frequency control, alternating current machine is covered through join reach slide block direct drive is tried pump, the test specimen simply that installs a form to differring changes join flange dish with slide block can. Gasoline tank installation is on workbench face, cubage makes an appointment with 150L, the installation inside gasoline tank has 3kW heater, gasoline tank bottom is apart from drive axis center to be 200mm high about, oil absorption mouth is in charge of diameter to be 30mm, can make sure oil absorption of hydraulic pump be tryinged is good. Gasoline tank face plate deserves to have vacuum meter and pressure list, vacuum is spent and give pressure of oily mouth to load in order to monitor oil absorption mouth. Suck, the mouth that answer oil all uses hydraulic quick coupler, make its installation handy, rapid, prevent gasoline tank oily current to go out at the same time. 4, this testing stand uses system of testing stand hydraulic pressure to load of scale overflow a powerful person, control scale electromagnetism a powerful person to have to load through telegraphic date by the computer, and carry signal of pressure sensor feedback undertake fine tuning to scale overflow a powerful person, its to load is accurate, implemented automation of to load process. Because be in to keep changing by test specimen, be sure to bring many contaminant to whole system, and scale overflow a powerful person spends a requirement to the cleanness of oily fluid taller. Accordingly, to ensure of whole system move normally. 2 class high pressure was used to filter when the design. Make its filter precision achieves 5 μ M, and use whole sealing gasoline tank. The viscosity of oily fluid gets oil lukewarm influence is great, what try to ensure discharge is measured is accurate, the system uses water cooler to be controlled strictly all right to oily Wen Jin, make its span is in 2 ℃ of ± . 5, the test parameter of this testing stand has system of testing stand test 4 parameter such as rotate speed, discharge, pressure, temperature. Rotate speed sensor is inductance type sensor, its output is sine wave signal, after classics dynatron magnifies, by Schmidt circuit (4093 chip) plastic, press via resistor cent, input reverser (4011) input end, receive the computer by the output end of reverser again 7210 board G2 end. As a result of 4093 chip touch hair n to be in reliably above of 6 　 V, add in dynatron to reach the 4093 voltage that go up to all use 12V so, it is 12V via the tall n that outputs after 4093 plastics so, low n is 0V, and the computer inputs voltage with not prep above 5V is advisable, so classics resistor cent is pressed, again classics is retrorse after circuit, send the computer the pulse signal of 5V voltage. The output itself of flow transducer is the pulse signal of 12V, every pulse is represented 0. 1L. When computation discharge pulse, if be counted in order to decide time plan pulse, the biggest OK and approximate at desertioning a pulse is counted, and because test time is shorter, the pulse number that desertion still will be magnified, the measurement with such inevitable larger generation error. Accordingly, when computation discharge pulse is counted, the method that measures time in order to decide pulse is more accurate. To reduce interference, the signal of pressure, temperature all uses the imitate amount of 4 ～ 20mA, send signal directly through HK16 core outlet 5411 board undertake A/D is changed. The correct ground connection of testing stand can prevent exterior interference signal. Because used transducer, if ground connection way is wrong, serious to generation of all of computer science department interference. After the ground connection problem that tests a system to this undertook a large number of exploration, solved the problem of interference final and satisfactorily. No matter protective means is ground connection,receive 0 protection, the trend of circuit must press following means: 0 (the ground) the ground connection end that the line enters transducer above all, bring to testing stand to wear next, join with control ark again (the attention does not use Chan Xin line) , because transducer is to be hanged on control ark, change in installation so the forehead implement when, must be isolated from the crust of transducer and machine ark. 6, software of control of all of testing stand computer science department is the industry of advanced much task that is based on MS-DOS operating system to control configuration software, this software has clew of complete Chinese graph, operation handy and reliable, interface is good wait for an advantage. Classics practice proof is a relatively outstanding industry controls configuration software. 6.

1, hardware system lead plane controls printer of pattern plate EPSON300K for IPC486DX4/100NA5411 and ACL7120 6.

2, software of configuration of control of software system industry but the graph shows operating mode, the online forms for reporting statistics that print, offer a hand to move reach automata picture. Move in the hand graphical clew function is had in the operation. This industry controls configuration software to comprise by the following file: CHZHI.

SYS of EXE executable software.

CQHI16J of file of DAT configuration data.

1 　 at 16 o'clock blast font CBTYPE.

File of DAT model data 7, conclusion fumbles through many experiment, put forward to change hydraulic pump to practically experiment method. Via a year much production uses a proof actually, this experiment method is operated easily, the test reflects the performance characteristics that turns to hydraulic pump well and truly as a result. Via using a proof, ZYBT- Ⅱ car changes hydraulic pump testing stand to working on the safe side, performance is steady, experiment process is full automatic change, the operation is handy, adaptability is strong, test result is accurate and authentic, and improved experiment efficiency greatly, have the value that extensive promotion uses. CNC Milling