CN102216750A - Hydraulic actuator and hydraulic vibration test device - Google Patents
Hydraulic actuator and hydraulic vibration test device Download PDFInfo
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- CN102216750A CN102216750A CN2009801463277A CN200980146327A CN102216750A CN 102216750 A CN102216750 A CN 102216750A CN 2009801463277 A CN2009801463277 A CN 2009801463277A CN 200980146327 A CN200980146327 A CN 200980146327A CN 102216750 A CN102216750 A CN 102216750A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
- G01M7/00—Vibration-testing of structures; Shock-testing of structures
- G01M7/02—Vibration-testing by means of a shake table
- G01M7/022—Vibration control arrangements, e.g. for generating random vibrations
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
- F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
- F15B15/00—Fluid-actuated devices for displacing a member from one position to another; Gearing associated therewith
- F15B15/08—Characterised by the construction of the motor unit
- F15B15/14—Characterised by the construction of the motor unit of the straight-cylinder type
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
- F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
- F15B11/00—Servomotor systems without provision for follow-up action; Circuits therefor
- F15B11/02—Systems essentially incorporating special features for controlling the speed or actuating force of an output member
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
- F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
- F15B21/00—Common features of fluid actuator systems; Fluid-pressure actuator systems or details thereof, not covered by any other group of this subclass
- F15B21/02—Servomotor systems with programme control derived from a store or timing device; Control devices therefor
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
- G01M7/00—Vibration-testing of structures; Shock-testing of structures
- G01M7/02—Vibration-testing by means of a shake table
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N3/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N3/32—Investigating strength properties of solid materials by application of mechanical stress by applying repeated or pulsating forces
- G01N3/36—Investigating strength properties of solid materials by application of mechanical stress by applying repeated or pulsating forces generated by pneumatic or hydraulic means
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2203/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N2203/0001—Type of application of the stress
- G01N2203/0005—Repeated or cyclic
- G01N2203/0008—High frequencies from 10 000 Hz
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2203/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N2203/003—Generation of the force
- G01N2203/0042—Pneumatic or hydraulic means
- G01N2203/0048—Hydraulic means
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- Investigating Strength Of Materials By Application Of Mechanical Stress (AREA)
- Fluid-Pressure Circuits (AREA)
Abstract
A hydraulic actuator provided with a hydraulic pump and a hydraulic cylinder unit. The hydraulic pump has a first suction and discharge opening and a second suction and discharge opening and can be reversely operated. The hydraulic cylinder unit is provided with a piston, a sleeve having an inner space partitioned by the piston into a first pressure chamber and a second pressure chamber, and a piston rod connected to the piston and having a front end projecting to the outside of the sleeve. The hydraulic actuator is provided with first piping for interconnecting the first pressure chamber and the first suction and discharge opening, and also with second piping for interconnecting the second pressure chamber and the second suction and discharge opening. When the hydraulic piston is reversely operated, hydraulic pressure is alternately applied to the first and second pressure chambers to vertically move the piston. The hydraulic actuator is further provided with a bypass pipe for interconnecting the first and second piping and also with an accumulator provided in the middle of the bypass pipe and applying back pressure to the first and second pressure chambers. A vibration test device equipped with the hydraulic actuator is also provided.
Description
Technical field
The present invention relates to oil pressure activated device and hydraulic type vibration testing device that a kind of energy high speed reverse rotation drives.
Background technology
As the vibration testing device that makes subject vibration by oil hydraulic cylinder, for example known put down in writing just like TOHKEMY 2000-2617, the device that uses positive displacement pump (positive displacement pump) and servo-valve.This vibration testing device can will be loaded greatly and be imposed on subject, makes the subject vibration with high-frequency simultaneously.Fig. 5 represents to use the example of loop diagram of the oil pressure vibration testing device of servo-valve.
Oil pressure vibration testing device 101 shown in Figure 5 has pump unit 110, start oil groove 120, oil hydraulic cylinder unit 130, servo-valve 140 and shaking table 150.Fixation workpiece W on shaking table 150 moves back and forth shaking table 150, thus workpiece W is applied vibration.
Oil hydraulic cylinder unit 130 has sleeve 131, mobile piston 132 and from a side-prominent piston rod 133 to sleeve 131 outsides of piston 132 in this sleeve 131.At the fixing shaking table 150 of the front end of piston rod 133.The inside of sleeve 131 is divided into first 131a of pressure chamber and second 131b of pressure chamber by piston 132.Fill start oil among first 131a of pressure chamber and second 131b of pressure chamber.In addition, first 131a of pressure chamber and second 131b of pressure chamber see through pipe arrangement 161,162 respectively and are connected to servo-valve 140.
Servo-valve 140 in order to switch the start oil that will send here from pump unit 110 deliver to pipe arrangement 161,162 one of them, and the oil pressure of the start oil of pipe arrangement is delivered in control.In addition, servo-valve 140 pipe arrangement that will not transmit start oil is connected to the pipe arrangement 164 that is communicated with start oil groove 120.The change action of servo-valve 140 and oil pressure adjustment action are by controller 102 controls.
When constituting oil hydraulic circuit in the mode that start oil is sent to pipe arrangement 161 from pump unit 110, start oil is fed into first 131a of pressure chamber, presses liter in first 131a of pressure chamber.Thus, piston 132 is pushed down to second 131b of pressure chamber, and shaking table 150 descends.At this moment, the start oil in second 131b of pressure chamber turns back to start oil groove 120 via pipe arrangement 162 and servo-valve 140.On the other hand, when constituting oil hydraulic circuit in the mode that start oil is sent to pipe arrangement 162 from pump unit 110, start oil is fed into second 131b of pressure chamber, presses liter in second 131b of pressure chamber.Thus, piston 132 is brought to first 131a of pressure chamber, and shaking table 150 rises.At this moment, the start oil in first 131a of pressure chamber turns back to start oil groove 120 via pipe arrangement 161 and servo-valve 140.
In addition, as shown in Figure 5, from pump unit 110 to servo-valve 140 pipe arrangement 163, link by house steward 165 with pipe arrangement 164 from servo-valve 140 to start oil groove 120.The start oil that pump unit 110 is supplied with can all not go to oil hydraulic cylinder unit 130, and some is to send back to start oil groove 120 via this house steward 165.In addition, in order in pipe arrangement 163 and 164, to prevent the adverse current of start oil, be respectively equipped with retaining valve 166,167 at each pipe arrangement.
Like this, in servo-valve formula vibration testing device, controller 102 control servo-valves 140, periodically switch with start oil deliver to first 131a of pressure chamber and second 131b of pressure chamber one of them, shaking table 150 is moved back and forth.Servo-valve formula oil pressure vibration testing device, to deliver to oil hydraulic cylinder unit 130 with the part of high pressure, big flow round-robin start oil owing to utilize servo-valve 140, so when switch with start oil deliver to first 131a of pressure chamber and second 131b of pressure chamber one of them time, pressure moment of delivering to the pressure chamber of start oil rises to high pressure, the not free moving direction that lingeringly switches shaking table 150.Therefore, can apply vibration to shaking table with high-frequency.
Be provided with acceleration transducer 103 at shaking table 150, the signal of acceleration transducer 103 detected expression acceleration is fed into controller 102.Controller 102 can calculate displacement, speed or the acceleration of shaking table 150 according to the testing result of acceleration transducer 103, and control servo-valve 140, makes shaking table 150 vibrate with desired displacement, speed or acceleration waveform.
Summary of the invention
The oil pressure activated device that uses servo-valve is for desired pressure moment and stably supply to oil hydraulic cylinder, and adopts following structure, that is, and and the abundant big pump of continuous drive flow, and the part of the oil pressure energy of only pump being supplied with supplies to oil hydraulic cylinder.Therefore, use required far away the surpassing of energy consumption of vibration testing device of this oil pressure activated device that subject is applied the vibration energy needed, cause energy dissipation.In addition, in order to make the circulation of start oil need jumbo start oil groove by this pump.
The present invention creates in order to address the above problem, and its purpose is to provide a kind of oil pressure activated device, does not need mammoth pump or start oil groove, high output is arranged and can react at a high speed, a kind of vibration testing device also is provided, can applies big load, with high frequency subject is applied vibration simultaneously subject.
Provide a kind of actuator according to embodiments of the present invention, the oil pressure pump that possesses the action of to reverse, the oil hydraulic cylinder unit, first pipe arrangement and second pipe arrangement, this oil hydraulic cylinder unit possesses piston, the inner space is divided into the sleeve of first pressure chamber and second pressure chamber by piston and links with piston and front end is projected into the piston rod of sleeve outside, this first pipe arrangement is connected to first suction/exhousting hole with first pressure chamber, second pipe arrangement is connected to second suction/exhousting hole with second pressure chamber, oil pressure pump counter-rotating action, alternately apply oil pressure for first and second pressure chambers thus, make piston up-down.This actuator also possesses house steward and the accumulator (accumulator) that links first and second pipe arrangements, and this accumulator is located at house steward midway, and first and second pressure chambers are applied opposite pressure.
Use in the actuator of embodiments of the present invention toward the oil pressure pump of positive and negative two directions counter-rotating action.This oil pressure pump can't be via servo-valve, but directly is connected with the oil hydraulic cylinder unit, to drive the oil hydraulic cylinder unit.The actuator of embodiment of the present invention, owing to drive the oil hydraulic cylinder unit according to the flow and the direction of the start oil of exporting from pump, so do not need servo-valve formula mammoth pump that actuator uses or start oil groove.In addition, according to above-mentioned reason, the required energy consumption of the actuator of embodiment of the present invention is not big like that compared to subject being applied the required energy of vibration, so can significantly suppress energy consumption compared to servo-valve formula actuator.
One of feature of the oil pressure pump of counter-rotating action is that the pressure of start oil reduces when making the start direction counter-rotating of pump, and the time delay about tens of milliseconds can take place before this pressure fully rises.Therefore, if having only merely pump is connected to the oil hydraulic cylinder unit, the driving direction counter-rotating that then makes pump is when switching the moving direction of shaking table, and above-mentioned time delay can take place, and can't move above-mentioned shaking table in the meantime.Therefore, can not make the subject vibration with high-frequency (more than tens of Hz), the time delay under this high-frequency can cause the influence that can not ignore.Yet, the actuator of embodiment of the present invention, because the pressure that accumulator applies regulation via house steward to first pressure chamber and second pressure chamber of oil hydraulic cylinder unit, so even make the direction of action counter-rotating of pump, the start oil pressure can reduce hardly, and above-mentioned time delay is very little.Therefore, the actuator of embodiment of the present invention can make the subject vibration with high frequency.
The size of the opposite pressure that accumulator applies first pressure chamber and second pressure chamber be preferably be set at bigger than the needed minimum pressure of the driving of oil hydraulic cylinder unit.In this situation, almost there is not the caused operating lag of oil hydraulic system.
The employed typical oil pressure pump of the oil pressure activated device of embodiment of the present invention is a piston-type pump.Actuator is preferably also possesses servo motor with the drive source as oil pressure pump.
In addition, the oil pressure activated device of embodiment of the present invention also can also possess the sensor of the action that detects oil pressure activated device movable part (or driven object of oil pressure activated device) and the controller of control servo motor.In this situation, controller can be controlled servo motor according to the testing result of sensor.In addition, sensor is preferably any that comprises in displacement transducer, speed pickup, acceleration transducer and the load sensor.In this situation, controller can be according to the testing result of sensor control servo motor, by the drive waveform piston with according to the rules displacement, speed or acceleration.Sensor is installed on the oil pressure activated device (being controller specifically) removably.
Sensor also can comprise load sensor.In this situation, controller can make the load waveform change according to the rules that is detected by load sensor according to the testing result control servo motor of sensor.
In addition,, provide a kind of vibration testing device, possess above-mentioned oil pressure activated device and the shaking table of being located at the piston rod front end according to embodiments of the present invention.
The vibration testing device of embodiment of the present invention is preferably also possesses the sensor of being located at shaking table and the controller of controlling servo motor.
In addition, the sensor of being located at shaking table also can comprise the sensor of displacement, speed or the acceleration of measuring vibrations worktable.In this situation, controller can drive shaking table with the specified waveform according to displacement, speed or acceleration according to the testing result control servo motor of sensor.
In addition, sensor also can comprise the load sensor of measuring the load that puts on subject.In this situation, controller can be according to the testing result of sensor control servo motor, with according to the rules waveform subject is applied load.
Description of drawings
Fig. 1 is the summary loop diagram of the vibration testing device of embodiment of the present invention.
Fig. 2 be the expression embodiment of the present invention vibration testing device in order to subject is applied the figure of the schematic configuration of quiescent load.
Fig. 3 is the acceleration of shaking table of the embodiment of the invention and the curve map of displacement.
Fig. 4 is the acceleration of shaking table of comparative example and the curve map of displacement.
Fig. 5 is to use the summary loop diagram of the prior oil pressure formula vibration testing device of servo-valve.
Embodiment
Below, use the description of drawings embodiments of the present invention.Fig. 1 is the loop diagram of the vibration testing device of present embodiment.As shown in Figure 1, the vibration testing device 1 of present embodiment has pump unit 10, start oil groove 20, oil hydraulic cylinder unit 30, shaking table 50 and accumulator 70.The oil pressure of supplying with by oil hydraulic cylinder unit 30 makes shaking table 50 move up and down, and the subject W that is fixed in thus on the shaking table 50 is applied in vibration.
In addition, pump main body 11 is piston-type pumps, start oil can be sent to the second suction/exhousting hole 11b from the first suction/exhousting hole 11a, or start oil is sent to the first suction/exhousting hole 11a from the second suction/exhousting hole 11b.By servo motor 12 driving pump main bodys 11, can change the flow and the direction of the start oil that pump main body 11 supplied with thus.For example: when driving servo motor 12 with certain periodic reversal, the flow and the direction that flow through the start oil between the first suction/exhousting hole 11a and the second suction/exhousting hole 11b can periodic variationizations.
The piston 32 that oil hydraulic cylinder unit 30 has sleeve 31, can move in sleeve 31 and fixing shaking table 50 at the front end of piston rod 33 from the piston rod 33 that the one side of piston 32 is projected into sleeve 31 outsides.The inside of sleeve 31 is divided into first 31a of pressure chamber and second 31b of pressure chamber by piston 32.Be filled with start oil at first 31a of pressure chamber and second 31b of pressure chamber.In addition, first 31a of pressure chamber is connected with the second suction/exhousting hole 11b with the first suction/exhousting hole 11a of pump main body 11 via pipe arrangement 61,62 respectively with second 31b of pressure chamber.In addition, use high-pressure hose etc. are as pipe arrangement 61,62, and this high-pressure hose etc. can be resisted the pressure rising (tens of approximately MPa) (not causing elastic deformation) of the start oil that takes place when shaking table 50 is moved.
Start oil groove 20 is connected with second 31b of pressure chamber with first 31a of pressure chamber via retaining valve 63,64 respectively.Each retaining valve 63,64 little situation of oil pressure (for example atmospheric pressure) in the inner pressure ratio start oil groove 20 of first 31a of pressure chamber and second 31b of pressure chamber is respectively opened, and start oil is supplied to pipe arrangement 61,62 from start oil groove 20.In the present embodiment, when first 31a of pressure chamber (or second 31b of pressure chamber) was filled start oil, retaining valve 63 (or retaining valve 64) was opened, and start oil moves to the 31a of pressure chamber (or the 31b of pressure chamber) from start oil groove 20.
Particularly, start oil is to carry out as follows to the filling of each 31a of pressure chamber, 31b.Be provided with the not shown valve that exhaust is used at first 31a of pressure chamber and second 31b of pressure chamber.At first, open the valve of first 31a of pressure chamber and close the valve of second 31b of pressure chamber, under this state, driving pump unit 10 is so that start oil and air are delivered to the first suction/exhousting hole 11a from the second suction/exhousting hole 11b.So the air in second 31b of pressure chamber and the pipe arrangement 62 is overflowed from the valve of first 31a of pressure chamber via pipe arrangement 61.Soon, it is lower than the pressure in the start oil groove 20 that the pressure of second 31b of pressure chamber and pipe arrangement 62 becomes, so retaining valve 64 is opened, the start oil in the start oil groove 20 is filled into first 31a of pressure chamber via pipe arrangement 62,61.
After start oil is filled into first 31a of pressure chamber, close the valve of first 31a of pressure chamber, open the valve of second 31b of pressure chamber, driving pump unit 10 is so that start oil is delivered to the second suction/exhousting hole 11b from the first suction/exhousting hole 11a.So the air in second 31b of pressure chamber and the pipe arrangement 62 is overflowed from the valve of second 31b of pressure chamber, in addition, piston 32 rises, and the start oil that is filled in first 31a of the pressure chamber side is pushed out into pipe arrangement 61.When piston 32 rose to upper dead center, the pressure of the start oil in first 31a of pressure chamber and the pipe arrangement 61 became lower than the pressure in the start oil groove 20, so retaining valve 63 is opened, the start oil in the start oil groove 20 moves to second 31b of pressure chamber via pipe arrangement 61,62.After start oil is filled in second 31b of pressure chamber, close the valve of second 31b of pressure chamber.
Below, the mechanism that in the vibration testing device 1 of present embodiment shaking table 50 is vibrated is described.When shaking table 50 was risen, driving pump unit 10 was so that start oil moves to the second suction/exhousting hole 11b from the first suction/exhousting hole 11a.So start oil supplies to second 31b of pressure chamber via pipe arrangement 62, piston 32 is pulled to first 31a of the pressure chamber side, and piston rod 33 and shaking table 50 rise.Start oil in first 31a of pressure chamber is delivered to second 31b of pressure chamber along with moving of piston 32 moves to pump unit 10 via pipe arrangement 61 from pump unit 10 via pipe arrangement 62.
When shaking table 50 is descended, driving pump unit 10 so that start oil move from the second suction/exhousting hole 11b toward the first suction/exhousting hole 11a.At this moment, start oil supplies to first 31a of pressure chamber via pipe arrangement 61, so piston 32 is pulled to second 31b of the pressure chamber side, piston rod 33 and shaking table 50 descend.Start oil in second 31b of pressure chamber moves toward pump unit 10 along with moving of piston 32 sees through pipe arrangement 62,10 sees through pipe arrangement 61 and is sent to first 31a of pressure chamber from the pump unit again.
As shown in Figure 1, the shaking table 50 at the vibration testing device 1 of present embodiment is equipped with acceleration transducer 3.Acceleration transducer 3 is connected with controller 2, and the signal of acceleration transducer 3 detected expression acceleration supplies to controller 2.Controller 2 calculates displacement, speed or the acceleration of shaking table 50 according to the testing result of acceleration transducer 3, sets the desired value that offers servoamplifier 4 according to this result of calculation, and this desired value is delivered to servoamplifier 4.The electric power that servoamplifier 4 is supplied with from power supply 5 generates has the cycle that the desired value according to controller 2 appointments sets and the alternating current of amplitude, and this alternating current is outputed to servo motor 12.Can apply vibration to shaking table 50 with for example displacement, speed or the acceleration amplitude of regulation according to above-mentioned processing.In addition, also can use displacement transducer or speed pickup to replace acceleration transducer 3.
Like this, the vibration testing device 1 of present embodiment constitutes, by can start oil being supplied to first 31a of pressure chamber or second 31b of pressure chamber of oil hydraulic cylinder unit 30 to the pump unit 10 that positive and negative two directions drive, shaking table 50 is moved along the vertical direction, make the subject W vibration of being fixed on this shaking table 50.
In addition, the vibration testing device 1 of present embodiment possesses and makes the house steward 65 that pipe arrangement 61 and 62 gathers and be located at house steward 65 accumulator 70 midway.Accumulator 70 is pressure vessels, and its inside is formed with gas (drying nitrogen etc.) layer of authorised pressure, and accumulator 70 pressurizes with first pressure chamber 31a or the second pressure chamber 31b of certain pressure to oil hydraulic cylinder unit 30 via pipe arrangement 61 and 62.
About not possessing the structure of house steward 65 and accumulator 70, the pipe arrangement (shaking table 50 is a pipe arrangement 61 when rising, and is pipe arrangement 62 during decline) of not supplying with this side of start oil becomes the low-pressure near the atmospheric pressure degree.Therefore, the rising of shaking table 50 and firm the switching after the back that descend make the pipe arrangement of this side of supplying with start oil and the pressure of pressure chamber rise to the high pressure (ten～tens of MPa) that is enough to mobile piston 32 from this low-pressure, need the time about tens of milliseconds.It during this time delay that shaking table 50 does not move.This time delay becomes the size that can't ignore with respect to the vibration period, so in the oil hydraulic system of this spline structure, can't apply vibration to shaking table 50 with the high-frequency more than tens of Hz.
In the vibration testing device 1 of present embodiment, accumulator 70 pressurizes, so that the pressure of pipe arrangement 61,62 and the 31a of pressure chamber, 31b maintains high pressure all the time, under this high pressure, start oil can pass to enough driving forces piston 32.In other words, 70 couples first 31a of pressure chamber of accumulator and second 31b of pressure chamber provide high opposite pressure, make the start in the 31a of pressure chamber, 31b and the pipe arrangement 61,62 often remain on the state that can transmit necessary load all the time thus.Therefore, the time delay the when structure of no accumulator 70 takes place hardly can apply vibration to shaking table 50 with the frequency more than tens of Hz.In addition, in order to shorten time delay as far as possible, set for the pressure of the gas blanket of accumulator 70 that is the size of 70 pairs of starts oil of accumulator applied pressure bigger than the mobile required minimum pressure of piston 32.In addition, use high-pressure hose etc. are as house steward 65, and this high-pressure hose etc. can fully be resisted 70 pairs of starts oil of accumulator applied pressure.
In addition, the pump main body 11 employed piston-type pumps of pump unit 10 are pulsed when driving easily.In the present embodiment, absorb pulsation by the accumulator of being located between pump unit 10 and the oil hydraulic cylinder unit 30 70.This feature is useful when the compression test of carrying out shown in Fig. 2 (a), in this compression test, clips subject W between support 52 and shaking table 50 shaking table 50 is risen, and subject W is applied the compression quiescent load of above-below direction.Above-mentioned feature also is useful when the tension test shown in Fig. 2 (b) similarly, in this tension test, the anchor clamps 53,54 that will be installed on shaking table 50 and support 52 ' are fixed in subject W, and shaking table 50 is descended, and subject W are applied the stretching quiescent load of above-below direction.
In addition, also can carry out following vibration test, that is, as Fig. 2 (a) and structure (b), configuration subject W moves back and forth shaking table, the load that periodic variation applies subject W between support and shaking table.In this situation, also can dynamometer load sensors such as (load cell) be set at support or shaking table, controller 2 comes the control pump unit according to the measurement result of this load sensor.For example: can carry out torture test, be certain mode with the amplitude of load that subject W is applied, and subject W is applied load cycling repeatedly.
[embodiment]
Below, carry out the result that vibration test obtains and use the vibration testing device that does not possess accumulator to carry out the result that vibration test obtains describing for the vibration testing device 1 of the present embodiment of using above explanation.Fig. 3 is the acceleration of the shaking table that measures and the curve map of displacement, and this measurement is at the target waveform that the vibration testing device 1 (embodiment) of present embodiment is provided the sine wave of frequency 50Hz, carries out when making subject W vibration.In addition, Fig. 4 is the acceleration of the shaking table that measures and the curve map of displacement, and this measurement is at the target waveform that the vibration testing device (comparative example) that does not possess accumulator is provided the sine wave of frequency 50Hz, carries out when making subject W vibration.In addition, the vibration testing device of embodiment and the vibration testing device of comparative example are except difference not structurally the having or not of accumulator.In addition, amplitude and the frequency of delivering to the alternating current of servo motor 12 from servoamplifier 4 do not have difference yet between embodiment and comparative example.
As shown in Figure 3, among the embodiment, the acceleration of the shaking table that measures and the waveform of displacement present sinusoidal wave shape, thus intimate loyalty applies vibration according to the target waveform of 50Hz to workpiece W.On the other hand, as shown in Figure 4, in the comparative example, the acceleration waveform and the sine wave of the shaking table that measures differ widely, and in addition, its amplitude is also less than 1/10th of embodiment.In addition, in the comparative example, the displacement of shaking table does not almost change.
So, the vibration testing device of present embodiment can apply vibration to subject with high-frequency.
Technical scope of the present invention is not limited to above-mentioned illustrative embodiment and the concrete form of embodiment.Be to use the oil pressure pump of piston-type pump in the above-mentioned embodiment, but can use the oil pressure pump of the variety of way beyond the piston-type pump to implement the present invention as actuator.In the several embodiments of the present invention, for example use rotary pumps such as gear-type pump or vane pump.
In addition, above-mentioned illustrative embodiment is an example, wherein will actuator be equipped on vibration testing device what the present invention had a feature structure, but this actuator can be equipped on various oil gears and system, reactive or low vibration of these various oil gears and system requirements high-frequency and low noise.For example: structure of the present invention can be used in material test device, mechanical arm etc.
Symbol description
1 vibration testing device
2 controllers
3 acceleration transducers
4 servo amplifiers
5 power supplys
10 pump unit
11 pump main bodys
11a first suction/exhousting hole
11b second suction/exhousting hole
12 servo motors
20 start oil grooves
30 oil hydraulic cylinder unit
31 sleeves
31a first pressure chamber
31b second pressure chamber
32 pistons
33 piston rods
50 shaking tables
65 house stewards
70 accumulators
Claims (14)
1. oil pressure activated device comprises:
Oil pressure pump with the action of can reversing of first suction/exhousting hole and second suction/exhousting hole;
Possess that piston, inner space are divided into the sleeve of first pressure chamber and second pressure chamber by this piston and link with this piston and front end is projected into the oil hydraulic cylinder unit of the piston rod of this sleeve outside;
First pipe arrangement that connects described first pressure chamber and described first suction/exhousting hole; With
Second pipe arrangement that connects described second pressure chamber and described second suction/exhousting hole;
Described oil pressure activated device makes by described oil pressure pump counter-rotating action, and described first pressure chamber and second pressure chamber are alternately applied oil pressure, makes described piston up-down,
This oil pressure activated device is characterised in that, also comprises:
The house steward who connects described first pipe arrangement and second pipe arrangement; With
Be located at described house steward midway, and described first pressure chamber and second pressure chamber applied the accumulator of opposite pressure.
2. oil pressure activated device as claimed in claim 1 is characterized in that:
The size of the opposite pressure that described accumulator applies described first pressure chamber and second pressure chamber is set at cylinder than described oil hydraulic cylinder unit, and to drive required minimum pressure bigger.
3. oil pressure activated device as claimed in claim 1 or 2 is characterized in that:
Described oil pressure pump is a piston-type pump.
4. as each described oil pressure activated device in the claim 1 to 3, it is characterized in that:
Also possesses the servo motor that drives described oil pressure pump.
5. as each described oil pressure activated device in the claim 1 to 4, it is characterized in that:
Also possess the sensor of the movable part of being located at the oil pressure activated device and control the controller of described servo motor,
Described controller is controlled described servo motor according to the testing result of described sensor.
6. oil pressure activated device as claimed in claim 5 is characterized in that:
Described sensor comprises any in displacement transducer, speed pickup, acceleration transducer and the load sensor,
Described controller is controlled described servo motor according to the testing result of described sensor, with the described piston of drive waveform of according to the rules displacement, speed or acceleration.
7. oil pressure activated device as claimed in claim 5 is characterized in that:
Described sensor comprises load sensor,
Described controller is controlled described servo motor according to the testing result of described sensor, so that the load waveform change according to the rules that is detected by described load sensor.
8. a vibration testing device is characterized in that, comprising:
The described oil pressure activated device of claim 1; With
Be located at the shaking table of the front end of described piston rod.
9. vibration testing device as claimed in claim 8 is characterized in that:
The size of the opposite pressure that described accumulator applies described first pressure chamber and second pressure chamber is set at cylinder than described oil hydraulic cylinder unit, and to drive required minimum pressure bigger.
10. vibration testing device as claimed in claim 8 or 9 is characterized in that:
Described oil pressure pump is a piston-type pump.
11., it is characterized in that as each described vibration testing device in the claim 8 to 10:
Also possesses the servo motor that drives described oil pressure pump.
12. vibration testing device as claimed in claim 11 is characterized in that:
Also possess the sensor of being located at described shaking table and the controller of controlling described servo motor,
Described controller is controlled described servo motor according to the testing result of described sensor.
13., it is characterized in that as claim 11 or 12 described vibration testing devices:
Described sensor comprises the sensor of displacement, speed or the acceleration of measuring vibrations worktable,
Described controller is controlled described servo motor according to the testing result of described sensor, drives described shaking table with the specified waveform according to displacement, speed or acceleration.
14., it is characterized in that as each described vibration testing device in the claim 11 to 13:
Described sensor comprises the load sensor of measuring the load that puts on subject,
Described controller is controlled described servo motor according to the testing result of described sensor, with according to the rules waveform described subject is applied load.
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
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| JP2008-298837 | 2008-11-21 | ||
| JP2008298837 | 2008-11-21 | ||
| PCT/JP2009/063695 WO2010058632A1 (en) | 2008-11-21 | 2009-07-31 | Hydraulic actuator and hydraulic vibration test device |
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| Publication Number | Publication Date |
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| CN102216750A true CN102216750A (en) | 2011-10-12 |
| CN102216750B CN102216750B (en) | 2014-12-31 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN200980146327.7A Active CN102216750B (en) | 2008-11-21 | 2009-07-31 | Hydraulic actuator and hydraulic vibration test device |
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| Country | Link |
|---|---|
| JP (2) | JP5368084B2 (en) |
| KR (1) | KR101305982B1 (en) |
| CN (1) | CN102216750B (en) |
| TW (1) | TWI420090B (en) |
| WO (1) | WO2010058632A1 (en) |
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| CN110857710A (en) * | 2018-08-23 | 2020-03-03 | 斯泰必鲁斯股份有限公司 | Measurement of operating parameters of an actuator |
| CN114382824A (en) * | 2021-12-22 | 2022-04-22 | 北京航天希尔测试技术有限公司 | High-variation overload resistant vibration table moving part position balancing system |
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Also Published As
| Publication number | Publication date |
|---|---|
| JP2014025590A (en) | 2014-02-06 |
| TW201020536A (en) | 2010-06-01 |
| WO2010058632A1 (en) | 2010-05-27 |
| JP2010151772A (en) | 2010-07-08 |
| KR101305982B1 (en) | 2013-09-12 |
| TWI420090B (en) | 2013-12-21 |
| KR20110070917A (en) | 2011-06-24 |
| JP5368084B2 (en) | 2013-12-18 |
| JP5735595B2 (en) | 2015-06-17 |
| CN102216750B (en) | 2014-12-31 |
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