The flexible pipe impulse testing machine
The utility model belongs to the Fluid Transmission and Control technical field, especially a kind of flexible pipe impulse testing machine.
At notification number is in the Chinese patent of CN 2672643Y, a kind of hydraulic hose assembly pulse testing platform is disclosed, this pulse testing platform is made of electrical control gear, hydraulic means, electro-hydraulic reversing valve, the off-load reversal valve of electrical control gear control hydraulic means, hydraulic means is made up of main hydraulic system and auxiliary hydraulic system, and the high-pressure oil passage of main hydraulic system is communicated with the two ends commutation of supercharger through electro-hydraulic reversing valve; The high-pressure oil passage of hydraulic system is connected with the off-load valve of changing oil.What this pulse testing platform adopted is electro-hydraulic reversing valve, can realize the pulse output of pressure by the commutation control of reversal valve.But can't control flexible pipe pulse and paired pulses waveform; In some test standard, the test waveform of mentioning in the test standard as automotive hose can't reach with existing method.
The utility model content
At the weak point that exists in the above-mentioned technology, the utility model provides a kind of project organization reasonable, can realize a kind of flexible pipe impulse testing machine that flexible pipe pulse and paired pulses waveform are controlled.
For achieving the above object, the utility model provides a kind of flexible pipe impulse testing machine, comprise main Hydraulic Station loop, servo control loop and test(ing) medium loop, described main Hydraulic Station loop is made of main oil pump, accumulator, main surplus valve, described servo control loop is made of supercharger, displacement transducer and servo-valve group, described main oil pump is connected with described accumulator by pipeline, and described servo-valve group comprises servo-valve a and servo-valve b, and described servo-valve a is connected with described supercharger.
Described accumulator is arranged at the rear end of described main oil pump, also is provided with main fuel tank at the front end of described main oil pump.
Described main fuel tank also is connected with long-range unloader and cooling pump respectively by pipeline.
Described servo-valve a is positioned at the low pressure end of described supercharger, and the input port of described servo-valve a is connected with the delivery outlet of described main oil pump.
The end of described servo-valve b with the vibration cylinder be connected, the other end then with described main oil pump and described accumulator between pipeline be connected.
Described displacement transducer is installed in the outside of supercharger.
Described test(ing) medium loop comprises high cryopump, variable-frequency motor and medium box, and described medium box is connected with medium pump, described surplus valve and pressure-release valve by pipeline.
The other end of described pressure-release valve also is connected with an end of described test specimen by pipeline.
The other end of described medium pump also is connected with the high-pressure side of described supercharger by pipeline.
Compared with prior art, the utlity model has following advantage:
The flexible pipe impulse testing machine that the utility model provides, comprise main Hydraulic Station loop, servo control loop and test(ing) medium loop, main Hydraulic Station loop is by main oil pump, accumulator, main surplus valve constitutes, servo control loop is by supercharger, displacement transducer and servo-valve group constitute, the test(ing) medium loop comprises high cryopump, variable-frequency motor and medium box, wherein, main oil pump is connected with accumulator by pipeline, the servo-valve group comprises servo-valve a and servo-valve b, servo-valve a is positioned at the low pressure end of supercharger, its input port is connected with the delivery outlet of main oil pump, the end of servo-valve b is connected with the vibration cylinder, the other end then with main oil pump and accumulator between pipeline be connected, medium box is by pipeline and medium pump, surplus valve and pressure-release valve are connected.The utility model is safe and reliable, adopt the electro-hydraulic servo control technology, pulsed frequency, buck speed and time, pulse is adjustable, can realize multiple different waveform, can regulate the temperature of test(ing) medium and test specimen environment according to the difference of testing requirements; Owing in the supercharger outside displacement transducer is installed, can measures to system leak and flexible pipe swell increment.
Description of drawings
Fig. 1 is a structural drawing of the present utility model.
The main element symbol description is as follows:
1 main fuel tank, 2 medium boxes, 3 main oil pumps
4 cooling pumps, 5 medium pump, 6 main surplus valves
7 surplus valves, 8 accumulators, 9 servo-valve a
10 servo-valve b, 11 pressure-release valves, 12 vibration cylinders
13 superchargers, 14 displacement transducers, 15 tensimeters
16 test specimens
For clearer statement the utility model, the utility model will be further described below in conjunction with accompanying drawing.
As shown in Figure 1, the utility model provides a kind of flexible pipe impulse testing machine, comprise main Hydraulic Station loop, servo control loop and test(ing) medium loop, main Hydraulic Station loop is made of main oil pump 3, accumulator 8, main surplus valve 6, servo control loop is made of with the servo-valve group supercharger 13, displacement transducer 14, and the test(ing) medium loop comprises high and low temperature medium pump 5, variable-frequency motor (not describing among the figure) and medium box 2.Accumulator 8 is arranged at the rear end of main oil pump 3, and is connected with main oil pump 3 by pipeline, also is provided with main fuel tank 1 at the front end of main oil pump 3, and main fuel tank 1 is connected with main surplus valve 6 and cooling pump 4 respectively by pipeline.The servo-valve group comprises that servo-valve a9 and servo-valve b10 constitute, and servo-valve a is connected with supercharger 13 and is positioned at the low pressure end of supercharger 13, and the input port of servo-valve a9 is connected with the delivery outlet of main oil pump 3.The end of servo-valve b10 is connected with vibration cylinder 12, and the other end then is connected with pipeline between main oil pump 3 and the accumulator 8 by pipeline.Displacement transducer 14 is installed in the outside of supercharger 13.Medium box 2 is connected with medium pump 5, surplus valve 7 and pressure-release valve 11 by pipeline, and the other end of pressure-release valve 11 also is connected with an end of test specimen 16 by pipeline, and the other end of medium pump 5 also is connected with displacement transducer 14 by pipeline.
Main oil pump: be the power oil sources, act on the low pressure end of pulse producer, the output of gating pulse peak value; Its import connects main fuel tank, and outlet connects accumulator, surplus valve and servo-valve.
Accumulator valve:, make system's even running in order to eliminate compression shock.
Main surplus valve: be contained in the main oil pump exit, keep the main oil pump output pressure constant.
When equipment did not need work, long-range unloader ordered about main surplus valve and opens, and made main motor be in non-loaded operation down, thereby prolonged the serviceable life of equipment.
Cooling-water machine: be provided with separately, adopt circulation type of cooling control major loop oil temperature to be lower than 50 ℃.
Servo-valve group: act on the low pressure end of supercharger, supercharger is carried out closed-loop control, with the test of the various waveforms of finishing pulse.Servo-valve is the critical component of electrohydraulic control system, and its import connects the outlet of main pump.
Supercharger: be pulse producer, it imports low pressure fluid according to the principle of stress balance at the large tracts of land piston end, or produces high pressure at the small area piston end; By the commutation of servo-valve, the control piston to-and-fro movement is to realize the pulse of pressure.Its low pressure end connects servo-valve, and high-pressure side connects high and low temperature medium and test specimen.
Displacement transducer: be contained in the supercharger outside, the leakage and the swell increment of test specimen spare detected.
High cryopump: import connects the high and low temperature medium case, finishes the filling and the circulation of medium, and outlet connects the high-pressure side of supercharger, and the fluid circulating pressure is a pulse trough force value.
Variable-frequency motor: regulate the pressure and the flow of test(ing) medium, to satisfy the use under the different operating modes.
The high and low temperature medium case: test(ing) medium both can heat and also can carry out freezingly, can satisfy the testing requirements in-40 ℃～200 ℃ temperature ranges.
Principle of work of the present utility model is:
This testing machine is the actual condition of simulated automotive flexible pipe work, sets up earlier under the particular environment temperature, and the temperature of this environment is controlled between-40～150 ℃.Under this environment temperature, the test flexible pipe is serially connected with in the closed hydraulic pressure closed circuit with pulse alternating pressure and temperature.The generation of the pressure alternation of this closed circuit medium is the technological core of this equipment with control.It comprises the detection or the like of temperature control, leakage and swell increment of generation, the high and low temperature medium case system of circulation, the servo-valve closed-loop control pulse of medium system.
More than disclosed only be several specific embodiment of the present utility model, still, the utility model is not limited thereto, any those skilled in the art can think variation all should fall into protection domain of the present utility model.