CN104422617A - Method and device for generating liquid pressure by adopting alternating current servo system - Google Patents
Method and device for generating liquid pressure by adopting alternating current servo system Download PDFInfo
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- CN104422617A CN104422617A CN201310394596.3A CN201310394596A CN104422617A CN 104422617 A CN104422617 A CN 104422617A CN 201310394596 A CN201310394596 A CN 201310394596A CN 104422617 A CN104422617 A CN 104422617A
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Abstract
The invention discloses a method and a device for generating liquid pressure by adopting an alternating current servo system. According to a set of alternating current servo system controlled by special computer software, a hydraulic cylinder piston is controlled to linearly move, a liquid inlet of a hydraulic cylinder is connected with a liquid container, and the liquid container is connected with an energy storage device, a pressure output opening and a pressure sensor. When a servo motor moves forwards after receiving a computer software instruction, the volume in the liquid container is compressed, an energy storage element in the energy storage device generates compressive deformation, and the quantity of the increased pressure value of liquid in the container is determined by reactive force; and moreover, an output value of the pressure sensor is detected by the computer at any time, and the operation of the servo motor is determined, so that a needed pressure curve is formed. A pressure fatigue performance test board formed by adopting the method and the device is simple in structure and convenient to clean, the generated pressure curve is fast in change, and the repeatability and the consistency are high.
Description
Technical field
The present invention relates in the hydraulic system of sealing, how utilize AC servo to produce pressure wave, make fluid pressure carry out the method that generates and device by computing machine pre-programmed curve.Be particularly useful for the pressure fatigue test of product, belong to field of hydraulic control.
Background technology
As oil cylinder, cylinder, pipeline etc., the problem of fatigue damage is all existed for a lot of product of pressure oil or gas that uses, needs to carry out product fatigue property test.Particularly if some specials are as pressure reserveir, automobile radiators etc., must carry out compressive resistance torture test to it especially, stand the test can be shaped.
Adopt in hydraulic system product being accessed a sealing, make product bear different pressures curve, different frequency hydraulic impulse impact be the common practice of carrying out pressure fatigue test, but existing similar testing table as described in patent 201210102672.4 its pressing creation method for promote special hydraulic drive cylinder by hydraulic servo proportioning valve, structure is more complicated, expensive; The mode system of the employing ram pump production burst pressure described in patent 201120378892.0 is simple, but generation waveform is mainly trapezoidal wave, can not realize as generation that is sinusoidal wave, triangular wave.
Summary of the invention
The object of the invention is to overcome the deficiencies in the prior art, propose a kind of AC servo that utilizes by the method for computing machine pre-programmed curve produce liquid pressure wave and device.
The present invention is achieved in that a set of AC servo being controlled by computing machine special software, its servomotor connects a reductor, the output of reductor can control a hydraulic cylinder piston and carry out rectilinear motion, an inlet of hydraulic cylinder is connected with a liquid container, and liquid container is also connected with an accumulator, pressure output, a pressure transducer.Hydraulic cylinder and liquid container, accumulator and the test products etc. be connected on pressure output form the combination liquid container of a sealing, when servomotor is by computer software instructions forward motion, hydraulic cylinder piston can be made to above-mentioned inlet direction linear running, thus compress the combination liquid container internal volume of this sealing, this container inner pressure is caused to raise, the energy-storage travelling wave tube of accumulator produces compressive deformation, and the large young pathbreaker of its reacting force determines in combination container, liquid raises how many force value; And during servomotor inverted running, hydraulic cylinder piston inverted running, accumulator energy-storage travelling wave tube discharges, and container inner pressure reduces; The output valve of computing machine detected pressures sensor at any time, determine that the operation of servomotor controls, the movement velocity of servomotor and stop place can cause fluid pressure in combination container indirectly to change by computer instruction change thus, thus the pressure curve required for being formed.
The pressure transducer be wherein connected with computing machine will react the change of fluid pressure in combination container rapidly, calculates the actuating speed to servomotor for software, thus forms the pressing creation system of a closed loop.
Owing to adopting AC servo as the power of pressing creation, it is extremely short to the instruction response time of computing machine, by the reasonable selection to hydraulic cylinder and accumulator, the time that whole pressure wave generates is short, the instruction response of following computing machine is fast, the as easy as rolling off a log any pressure pulse waveform obtaining needing.
The pipeline that above-mentioned package unit also needs to set up liquid to pour into, pump, surplus valve, on-off valve and get rid of ducts, facility, equipment etc. needed for gas in combination container.
Accumulator can adopt general leather bag type hydraulic accumulator, spring hydraulic energy storage device, or adopts a small cylinder to add that cylinder with large diameter spring forms, and cylinder with large diameter spring is energy-storage travelling wave tube.The connection of one of them inlet of this hydraulic cylinder and hydraulic container, only the piston other end is not connect servomotor and is connected with cylinder with large diameter spring one end by a rigid connector, when this hydraulic cylinder piston promotes by pressure in combination container, cylinder with large diameter spring will be compressed, if otherwise spring is compressed, power on the upper piston of top is greater than in combination container that liquid is to piston pressure, and this hydraulic cylinder is by counter motion.This cylinder with large diameter spring also can be changed to the higher leaf spring of rigidity.
Accumulator is the passive supplier that the present invention realizes that in combination container, pressure wave generates, if do not arrange energy storage device, in the combination container of sealing, liquid is equivalent to a rigid body, is not easy the curvilinear motion realizing pressure.When servomotor does not promote linked hydraulic cylinder, accumulator is in release conditions, when servomotor promotion hydraulic cylinder compresses the volume of whole combination container, accumulator also can produce corresponding distortion, because liquid is generally incompressible body, so the deformation of accumulator makes combination container inner volume increase, and equal the volume that hydraulic cylinder reduces.When stopping action in servomotor pushing course, accumulator can not be discharged by the deformation compressed, sustained power can be produced, this power to be added in accumulator leather bag or major diameter spring connect after on small cylinder piston, be the source of fluid pressure in now combination container, being liquid pressure to external world, is also pressure that pressure transducer detects.Clearly, the size of this power is decided by that accumulator is by the deformation size compressed and its elasticity of compression coefficient.For obtaining different pressing creation speed, several different accumulator can be adopted, utilizing hydraulic valve to connect one of them or multiple change as different pressures curve line control.
The piston area of hydraulic cylinder and travelling speed also will affect the speed of pressure wave generation, so when computing machine controls to overlap AC servomechanism more simultaneously, when each servo control mechanism selects different hydraulic cylinders to be all connected on middle liquid container, the superposition of different pressures waveform can be realized, thus realize the generation of complex pressure ripple.
When pressure fatigue strength test under test products needs to carry out different temperatures, can separately establish ebullator that liquid is flowed between well heater and above-mentioned hydraulic container and test products.
The effect that the present invention compared with prior art has:
1, adopt AC servo as the power of pressing creation, simply, without the need to considering that oil pollution makes the problem of the bad adjustment of hydraulic servo proportional valve control sensitivity, comprehensive cost performance is high for technology maturation, control.
2, the reasonable employment of accumulator, can also reduce the steep that pressure wave generates, enable computing machine judge the situation of change of current pressure in time by sensor, thus improves the degree of accuracy controlled.
3, produce liquid pressure curve is that computing machine adjusts immediately according to default and pressure transducer value of feedback, and its repeatability, consistance are good.
Accompanying drawing explanation
Below in conjunction with accompanying drawing, the specific embodiment of the present invention is described in detail.
Fig. 1: be a specific embodiment system composition diagram of the present invention.
Embodiment
As shown in Figure 1, realize a kind of method adopting AC servo to carry out pressure wave generation of the present invention, required device basic composition part is described as follows:
Computing machine 101 connects alternating-current servo controller 102 and liquid pressure sensor 205, the AC servo motor 103 that alternating-current servo controller 102 controls drives reductor 104, the output of 104 is linear motion axis, be connected with the piston 203 of hydraulic cylinder 204 by illustrating 401 mechanical connecting devices, one of them fluid chamber of hydraulic cylinder 204 is connected with air by filter for molten 202, another fluid chamber is connected with hydraulic container 201 by pipeline 211, 201 cavitys are also by pipeline and pressure transducer 205, test products 301, accumulator 206, liquid feed valve 210, air outlet valve 209 is connected, liquid feed valve 210 is connected with liquid feeding pump 501, liquid storage device 208 liquid outlet is connected with liquid feeding pump 501, the another pipeline 207 that also passes through is connected with air with air outlet valve 209.
For briefly illustrating implementation procedure of the present invention; do not indicate other required accessories in the drawings; as over-pressure safety device, liquid filter, for getting rid of the pipeline that tainer air increases and the liquid heater that may increase in liquid feeding pump 501 with liquid feed valve 210 etc.; these are all conventional known technologies, separately do not explain at this.Below for how starting generating computing machine preset pressure curve step to be described:
1, liquid feed valve 210, air outlet valve 209 is opened, drive liquor pump 501, required for test liquid is squeezed in pressure cylinder 201, the pipeline connected by reasonable Arrangement, gas in combination liquid container is discharged, until there is liquid to flow back to liquid storage device 208 by air outlet valve 209 by air outlet valve 209.
2, computing machine starts to drive AC servo, servomotor drives reductor, reductor makes hydraulic cylinder piston rectilinear motion, first to the motion of connection liquid container 201 inlet direction, motion in the other direction again after end, close to just but stop when arrive another end, to discharge air and to make admission chamber volume increase to maximum.
3, close liquid feed valve 210, air outlet valve 209, drive liquor pump 501, make test products 301 inner chamber and liquid container 201, hydraulic cylinder 204 admission chamber, hydraulic energy storage device 206 form a closed combination liquid container.
4, now, computing machine suitably can adjust the motion of servomotor, drives the piston 203 of hydraulic cylinder 204, makes pressure transducer value of feedback be zero.
5, the preset pressure curve that computing machine generates as required starts to drive AC servo, servomotor drives reductor, reductor makes the piston 203 of hydraulic cylinder 204 move to inlet direction, accumulator is by liquid transfering pressure effect in combination container, corresponding energy-storage travelling wave tube starts compressive deformation, produces the reacting force to liquid in combination container; The sampled value of the simultaneous computer detected pressures sensor of servomotor motion, pressure reaches desired value and namely stops driven plunger, thus the pressure wave curve realizing closed loop exports.
6, during the course, according to the waveform of output pressure curve requirement, if certain force value need be kept motionless, computing machine stops servomotor running and keep hydraulic cylinder piston position motionless, there is pressure loss can with seasonal servomotor action in pressure maintaining period, with steady pressure.
Owing to have employed the means of AC servo control system as pressing creation, adjustment in the present invention, and AC servo motor 103 toggle speed is fast, generally run to full gear from startup, time can be short to several millisecond, and servo controller 102 makes servomotor motion response in whole pressure curve generative process rapid by the mode of frequency control.This testing table making employing the present invention generate pressure waveform has response speed quickly, ideally can produce the pressure waveform that computing machine is preset.
As AC servo control system, more convenient employing be AC servo electric cylinder, its servomotor can be combined into one with reductor, output may be selected to be line handspike, the skid-resistant function of stop motion rear push-rod energy mechanical self-latching can be had, can facilitate, be connected with corresponding hydraulic cylinder piston simply; Then its supporting alternating-current servo controller is connected with computing machine, by corresponding steering order, to realize rotating and the speeds control of servomotor.
Type selecting can be carried out to hydraulic accumulation energy device according to the pressure waveform maximum pressure peak value that testing table will reach, the gasbag-type hydraulic energy storage device that charge pressure is higher can be adopted, also can adopt fast response time, reproducible specially made hydraulic cylinder adds large-diameter circular spring energy storage device, the elasticity coefficient of spring and maximum be also the fastest rate of change key factor determining pressure waveform by reduction length.
According to the pressure waveform rate of change requirement that table apparatus will reach, can carry out type selecting to hydraulic cylinder 204 diameter that servo-drive system reductor 104 connects further, recommendation step is as follows:
1, first determine accumulator compresses how many volumes, maximum pressure peak value can be met the requirements of, can determine that hydraulic cylinder 204 needs the size by piston 203 compression volume in boost process, tentatively preset a diameter again, calculating piston 203 needs the air line distance of action how long to have, add certain surplus namely probably to know and hydraulic cylinder Len req.
2, according to the maximum rate requirement of pressure waveform change, maximum pressure value is elevated to from zero-pressure force value as required in how long, determine the shortest time of piston 203 action of hydraulic cylinder 204, the movement velocity requirement of servo-drive system reductor 104 output mechanism can be estimated.
3, the Resistance Value that during calculating maximum pressure value, piston 203 can run into, this value equals maximum pressure value and is multiplied by piston area, thus obtain the force value of servo-drive system reductor 104 needs output, in conjunction with the reductor output mechanism rate request that previous step is determined, type selecting can be carried out to AC servo.
If 4 to make according to the above-mentioned parameter calculated that the type selecting of AC servo is bad to be determined, as there is no output torque and the speed of dimension, except the complete servo-drive system can selected higher than corresponding parameter, also can reset piston 203 diameter of a hydraulic cylinder 204, calculate again, thus determine suitable AC servo.
Rate of pressure change to ask is not high, can select the driving hydraulic cylinder 204 of a presetting small diameter, thus reduces the requirement to AC servo output torque.
But, when requiring very fast rate of pressure change, type selecting AC servo power out can be caused too huge, waste is caused when needing slower pressure history, so supplement as one of the present invention, can require in very fast rate of pressure change experimental bench system, increase another one high-voltage oil cylinder, this supplementary oil cylinder is driven with high pressure liquid force feed when pressure change requirement is very fast, the volume of Fast Compression or increase aforesaid liquid place combination sealing container intracavity, reach and generate fast-changing pressure waveform curve object, again reduce the AC servo output power selected simultaneously.
Claims (9)
1. the method adopting AC servo to carry out fluid pressure generation, it is characterized in that: have a set of AC servo being controlled by computing machine special software, its servomotor connects a reductor, the output of reductor can control a hydraulic cylinder piston and carry out rectilinear motion, an inlet of hydraulic cylinder is connected with a liquid container, and liquid container is also connected with an accumulator, pressure output, a pressure transducer.Hydraulic cylinder and liquid container, accumulator and the test products etc. be connected on pressure output form the combination liquid container of a sealing, when servomotor is by computer software instructions forward motion, hydraulic cylinder piston can be made to above-mentioned inlet direction linear running, thus compress the combination liquid container internal volume of this sealing, this container inner pressure is caused to raise, the energy-storage travelling wave tube of accumulator produces compressive deformation, and the large young pathbreaker of its reacting force determines in combination container, liquid raises how many force value; And during servomotor inverted running, hydraulic cylinder piston inverted running, accumulator energy-storage travelling wave tube discharges, and container inner pressure reduces; The output valve of computing machine detected pressures sensor at any time, determine that the operation of servomotor controls, the movement velocity of servomotor and stop place can cause fluid pressure in combination container indirectly to change by computer instruction change thus, thus the pressure curve required for being formed.
2. a kind of method adopting AC servo to carry out fluid pressure generation according to claim 1, it is characterized in that: the output valve of computer sampling pressure transducer, drive servomotor again, form the AC Servo Control linear motion system of a closed loop, the curve ripple achieving fluid pressure is produced.
3. a kind of method adopting AC servo to carry out fluid pressure generation according to claim 1, is characterized in that: in AC servo, its reductor take-off lever connected of servomotor is orthoscopic motion.
4. adopt AC servo to carry out a device for fluid pressure generation, it is characterized in that: following component part can be divided: the computing machine being provided with special software; A set of AC servo linear motion system being controlled by computing machine special software; Pressure-driven hydraulic cylinder; Accumulator; Pressure transducer; The pump of perfusion fluid and valve; A liquid container and corresponding pipeline; Other are as the accessory such as liquid filter and surplus valve.A wherein said liquid container is connected to pressure-driven hydraulic cylinder, accumulator, pressure transducer, and underproof product, be connected to again the pump of perfusion fluid by valve, when after valve closing, the above-mentioned parts linked together define the sealing liquid container of a combination.
5. a kind of device adopting AC servo to carry out fluid pressure generation according to claim 4, it is characterized in that: accumulator can adopt general leather bag type hydraulic accumulator, spring hydraulic energy storage device, or adopting a small cylinder to add that cylinder with large diameter spring forms, cylinder with large diameter spring is energy-storage travelling wave tube.One of them inlet of this hydraulic cylinder is connected with above-mentioned hydraulic container, the piston other end is connected with cylinder with large diameter spring one end by a rigid connector, when this hydraulic cylinder piston promotes by fluid pressure in combination container, cylinder with large diameter spring will be compressed, if otherwise spring is compressed, power on the upper piston of top is greater than in combination container that liquid is to piston pressure, and this hydraulic cylinder is by counter motion.
6. a kind of device adopting AC servo to carry out fluid pressure generation according to claim 4, it is characterized in that: AC servo linear motion system promotes pressure-driven hydraulic cylinder inner carrier rectilinear motion, piston compression combination sealing liquid container volume, produce fluid pressure, this pressure is delivered to after on accumulator, energy-storage travelling wave tube alternating compression in accumulator, produces reacting force, equaling as liquid pressure to external world, is also pressure that pressure transducer detects.
7. a kind of device adopting AC servo to carry out fluid pressure generation according to claim 4, it is characterized in that: AC servo linear motion system promotes pressure-driven hydraulic cylinder inner carrier rectilinear motion, piston moves away from hydraulic cylinder admission chamber, increase combination sealing liquid container volume, if now energy-storage travelling wave tube alternating compression in accumulator, deformation reduces, and the reacting force of generation reduces, and liquid pressure to external world also just reduces.
8. a kind of device adopting AC servo to carry out fluid pressure generation according to claim 4, is characterized in that: by increasing the complexity superposition of setting up the driving hydraulic cylinder of accumulator or the different-diameter with different pressures response parameter or the AC servo of different stroke can realize fluid pressure generation waveform.
9. a kind of device adopting AC servo to carry out fluid pressure generation according to claim 4, it is characterized in that: AC servo control system, preferred employing be AC servo electric cylinder, export as line handspike, there is the skid-resistant function of stop motion rear push-rod energy mechanical self-latching, can facilitate, be connected with corresponding hydraulic cylinder piston simply.
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| CN201310394596.3A CN104422617A (en) | 2013-09-03 | 2013-09-03 | Method and device for generating liquid pressure by adopting alternating current servo system |
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| CN201310394596.3A CN104422617A (en) | 2013-09-03 | 2013-09-03 | Method and device for generating liquid pressure by adopting alternating current servo system |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN105716822A (en) * | 2016-01-28 | 2016-06-29 | 武汉信测标准技术服务有限公司 | Control method and device for low-pressure pulse duration test of automobile part |
| CN106325320A (en) * | 2015-07-06 | 2017-01-11 | 格力电器（芜湖）有限公司 | Hydraulic pulse test bench |
| CN106644547A (en) * | 2017-01-03 | 2017-05-10 | 无锡塔尔基热交换器科技有限公司 | Pulse simulation device |
| CN107957315A (en) * | 2018-01-09 | 2018-04-24 | 上海仪器仪表自控系统检验测试所有限公司 | A kind of pressure-resistant fatigue experimental device of pressure gauge |
| CN109916729A (en) * | 2019-04-02 | 2019-06-21 | 山东省医疗器械产品质量检验中心 | A kind of test device and its working method of static conditions downcomer burst pressure |
| CN109990993A (en) * | 2019-04-02 | 2019-07-09 | 山东省医疗器械产品质量检验中心 | A kind of powered inj ection instrument flow and pressure experimental device and its working method |
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- 2013-09-03 CN CN201310394596.3A patent/CN104422617A/en active Pending
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106325320A (en) * | 2015-07-06 | 2017-01-11 | 格力电器（芜湖）有限公司 | Hydraulic pulse test bench |
| CN105716822A (en) * | 2016-01-28 | 2016-06-29 | 武汉信测标准技术服务有限公司 | Control method and device for low-pressure pulse duration test of automobile part |
| CN105716822B (en) * | 2016-01-28 | 2019-11-08 | 武汉信测标准技术服务有限公司 | Control method and device for automobile component action of low-voltage pulse endurance test |
| CN106644547A (en) * | 2017-01-03 | 2017-05-10 | 无锡塔尔基热交换器科技有限公司 | Pulse simulation device |
| CN107957315A (en) * | 2018-01-09 | 2018-04-24 | 上海仪器仪表自控系统检验测试所有限公司 | A kind of pressure-resistant fatigue experimental device of pressure gauge |
| CN109916729A (en) * | 2019-04-02 | 2019-06-21 | 山东省医疗器械产品质量检验中心 | A kind of test device and its working method of static conditions downcomer burst pressure |
| CN109990993A (en) * | 2019-04-02 | 2019-07-09 | 山东省医疗器械产品质量检验中心 | A kind of powered inj ection instrument flow and pressure experimental device and its working method |
| CN109916729B (en) * | 2019-04-02 | 2024-04-02 | 山东省医疗器械产品质量检验中心 | Device for testing bursting pressure of catheter under static condition and working method thereof |
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