SU1446367A1 - Bed for testing hydraulic machines - Google Patents

Abstract

The invention makes it possible to increase stevd productivity and test accuracy. Shafts 4 and 5 of the tested hydraulic machines (ha) 2, 3. Medium between each other. Two loading W 6 and 7 are equipped with rotary 15 and 8 and 9, made in reversible engines, and connected to their shafts. The input of each of the W 2 and 3 is communicated with a thrashing LINIASH1 10 to 11 hectares 6 and 7, and through the safety valve 12- I IW 4i 4i Od ff Phil.

Description

and 13 - with tank 14. The output of each of GM 2 and 3 is connected by drain lines 15 and 16 with tank 14. System 22 of diagnostics and control is implemented in the form of block 23 for selecting test programs of computer 24, measurement and automatic control subsystems 25 and 26 parameters of the actuators 27 for controlling the frequency (moment) and the mechanism 28 for controlling the pressure (flow). The inputs 25k are connected to sensors 17,

446367

18, 20 and 21 parameters, and its outputs are with inputs. The outputs of the subsystem 26 are connected to the actuators 27 and 28. The block 23 is connected to the input of the computer, the outlets are connected to the inputs of the subsystem 26. Stand 1 m. built into the general cycle of GM automated production. It is possible to simultaneously test at least two pairs of GM. And test them in modes of a pump and a motor without additional rewiring. 3 il.

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The invention relates to engineering hydraulics and can be used in test benches with power recovery during adjustment and control of hydraulic machines.

The purpose of the invention is to improve the performance and accuracy of testing.

Fig. 1 shows a general scheme of the stand J in Fig. 2 — a diagram of measuring and monitoring the feed coefficient Kfli in Fig. 3 — a diagram of measuring and controlling the volumetric efficiency 1y.

Stand 1 contains a hydromechanical part, where at least one pair of tested hydraulic machines 2 and 3 are arranged with the possibility of replacing, the shafts 4 and 5 of which are interconnected, and two non-discharging hydraulic machines 6 and 7, each of which is equipped with a rotary drive 8 (9) made in the form of a reversible engine, and is connected by its 6 shaft. The input of each of the tested hydraulic machines 2 and 3 is communicated respectively with pressure lines 10 and 11 of the loading hydraulic machines 6 and 7 and through safety valves 12 and 13 with the tank 14. The output of each hydraulic machine 2 and 3 is connected, respectively, with drain J | IIIMI 15 and 16

with tank 14. Parameters sensors are installed in the pressure pipes 10 and 11 and the drain 15 and 16 lines: 4) ashometers 17, pressure sensors 18, in pressure 10 and 11 lines at the inlet I of the tested hydraulic machines 2 and 3 adjustable throttles 19 are installed. shafts 4 and 5 of the tested hydraulic machines 2 and 3 and on the shafts

Drives 8 and 9 of the load hydraulic machines 6 and 7 are equipped with rotational speed sensors 20 and torque sensors 21.

The bench is equipped with a diagnostics and control system 22, made in the form of a block 23 for selection of test programs, a computer 24, measurement subsystems 25 and automatic control

26 parameters of the actuators 27 for controlling the frequency (moment) and the mechanism 28 for controlling the pressure (flow). In this case, the inputs of the parameter measurement subsystem 25

17, 18, 20, and 21 parameters are connected with sensors, and its outputs are connected to computer inputs 24. The inputs of the automatic parameter control subsystem 26 are connected to actuators 27 and 28. The test program selection block 23 is connected to computer input 24, the outputs of which are connected with inputs of automatic control subsystem 26. The computer 24 may comprise a processor 29 connected by address bus 30 to address switch 31 and address decoder 32 and connected by data bus 33 and control bus 34 to data buffer 35, discrete signal input module 36, digital-analog conversion module 37, discrete signal input module 38 and analog-to-digital conversion module 39. Memory block 40

connected to the data buffer 35 and the address switch 31. The test program selection block 23 is connected via the direct memory access channel 41 to the processor 29. The outputs of the parameter measurement unit 23 are connected to the inputs of the modules 38 and 39, and the inputs of the automatic control subsystem 26 are connected with the outputs of modules 36 and 37. As a unit 23, a device for inputting character digital information with a signal level can be used - according to the technical conditions of channel 41 and computer 24.

The stand works as follows.

From block 23 of the selection of test programs, the processor 29 of the computer 24 via channel 41 receives information on the modification of the hydraulic machines to be tested. The cells of the memory unit 40 contain test programs of test modes. When a command is sent from the address switch 31, the information from the cell of the memory block 40 via the control bus 34 through the data buffer 35 and the data bus 33 enters the processor 29. The process of information exchange between the processor 29 and the module 9 of the drive 9 goes into the compensator mode by means of 38 and 39 on the measurement of the parameters of the total losses. The control of their modules 36 and 37 for controlling the modes is only characterized in that the address code of these modules goes to the address decoder 32.

The hydraulic machines 2, 3 and 6 installed on the bench 1, 7 are activated by means of drives 8 and 9 according to a predetermined test program and are monitored by the diagnostic and control system 22. The actuators 27 and 28 regulate the rotational speed of the drive 8 of the hydraulic machine 6 operating in the hydraulic pump mode and the pressure in the pressure line 10 at the inlet of the hydraulic machine 2, which operates in the mode of a hydraulic motor with energy recovery and transmits the torque to the hydraulic machine through shafts 4 and 5 3. The hydraulic machine 3, operating as a hydraulic pump, with the help of an adjustable throttle 19 creates in the pressure line 11 the required pressure at the inlet of the hydraulic machine 7 operating in the mode of a hydraulic motor with energy recovery, the drive 9 being the load and the pack Aulus is similar to the control actuator 8. The compensation of losses produced hydromechanical actuator 8, 9 and the actuator operates in the energy recovery in the network.

On the test mode defined by the program using the flow meter 17 and sensors 18, 20 and 21 parameters

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Signals proportional to the well-measured parameters are transmitted to the measurement subsystem 25 and, through modules 38 and 39, to the computer 24. In accordance with the computer test program 24 specified by block 23, the measured values of the measured parameters are analyzed and compared with the specified values. and through modules 36 and 37, corrects the current mode, or transitions to the next mode, or ends the tests.

Upon completion of testing of hydraulic machines 3 and 6 in the pump mode, A of the hydraulic machines 2 and 7, in the Motor mode, the reverse operation is performed: hydraulic machines 3 and 6 are in the mode of hydraulic motors, and hydraulic machines 2 and 7 are in the mode of hydraulic pumps. For this, the computer 24 through modules 36 and 37 exerts control actions on the actuating mechanisms 27 for switching the drive 8 into the energy recovery mode to the network, and

Complementary mechanisms 27 and 28 are produced as described. After testing the hydraulic machines, the computer 24 carries out a general analysis of the validity of the guide Romashin and records the deviations of the technical parameters of the tested hydraulic machines.

The stand can be built into the general cycle of automated production of hydraulic machines. The productivity of the tests is increased by simultaneously testing at least two pairs of hydraulic machines and the possibility of testing them in pump and motor modes without additional rewiring. stand

Claims (1)

Invention Formula Test bench for hydraulic machines according to the scheme with power recovery, containing tank, pressure and drain lines, safety valves, parameter sensors, load and test hydraulic machines, and the shafts of the latter are interconnected, with the input of each of the tested hydraulic machines communicated with the pressure line of the load hydraulic machines and through a safety valve it is connected to the tank, and the output of one of them is communicated by a drain line to the tank, characterized in that, in order to improve the performance and accuracy of the tests, the stand is equipped with a system nd diagnosis and control, B1 | full in the form of a block for selecting test programs, a computer, measurement subsystems and automatic control of parameters and actuators, with the inputs of a measurement subsystem of parameters connected with pa1 sensors | Ametrov and its vyf gb / Xf iina KWfftf3 / 0 / K KQ ; 2 j M1Sh 4 5 67 89 S; / f2 T.Mifff Figure 2 J one strokes - with computer inputs, outputs of the automatic parameter adjustment subsystem are connected to actuators, the test program selection block is connected to the computer input, the outputs of which are connected to the inputs of the automatic regulation subsystem, while each of the tested hydraulic machines is communicated by a drain line to the tank. Jn