CN102216750B - Hydraulic actuator and hydraulic vibration test device - Google Patents
Hydraulic actuator and hydraulic vibration test device Download PDFInfo
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- CN102216750B CN102216750B CN200980146327.7A CN200980146327A CN102216750B CN 102216750 B CN102216750 B CN 102216750B CN 200980146327 A CN200980146327 A CN 200980146327A CN 102216750 B CN102216750 B CN 102216750B
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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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- 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
- 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
-
- 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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- Engineering & Computer Science (AREA)
- General Physics & Mathematics (AREA)
- Fluid Mechanics (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
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- Health & Medical Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- Biochemistry (AREA)
- General Health & Medical Sciences (AREA)
- Immunology (AREA)
- Pathology (AREA)
- 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 actuator and the hydraulic type vibration testing device of the driving of a kind of energy high speed reverse rotation.
Background technology
As the vibration testing device making subject vibrate by oil hydraulic cylinder, such as, there will be a known device described in Japanese Unexamined Patent Publication 2000-2617, that use positive displacement pump (positive displacement pump) and servo-valve.Large load can be applied to subject by this vibration testing device, with high-frequency, subject is vibrated simultaneously.Fig. 5 represents an example of the loop diagram of the oil pressure vibration testing device using servo-valve.
Oil pressure vibration testing device 101 shown in Fig. 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, makes shaking table 150 move back and forth, and applies vibration thus to workpiece W.
Pump unit 110 utilizes motor 112 to drive positive displacement pump main body 111, is connected between start oil groove 120 with servo-valve 140 with oil hydraulic circuit.In addition, the sense of rotation of motor 112 is defined in a direction, and namely motor 112 only can rotate forward.In addition, the rotational speed of motor 112 roughly keeps certain.Pump unit 110 only has function start oil being delivered to servo-valve 140 from start oil groove 120, and its flow roughly keeps certain.
Oil hydraulic cylinder unit 130 has sleeve 131, mobile piston 132 and be projected into the piston rod 133 of sleeve 131 outside from the side of piston 132 in this sleeve 131.Shaking table 150 is fixed in the front end of piston rod 133.The inside of sleeve 131 is divided into the first pressure chamber 131a and the second pressure chamber 131b by piston 132.Start oil is filled in first pressure chamber 131a and the second pressure chamber 131b.In addition, the first pressure chamber 131a and the second pressure chamber 131b is connected to servo-valve 140 through pipe arrangement 161,162 respectively.
Servo-valve 140 in order to switch the start oil sent here from pump unit 110 delivered to pipe arrangement 161,162 one of them, and control the oil pressure delivering to the start oil of pipe arrangement.In addition, the pipe arrangement not transmitting start oil is connected to the pipe arrangement 164 be communicated with start oil groove 120 by servo-valve 140.Switching action and the adjustment of oil pressure action of servo-valve 140 are controlled by controller 102.
When so that start oil is formed oil hydraulic circuit from the mode that pump unit 110 is sent to pipe arrangement 161, start oil is fed into the first pressure chamber 131a, presses liter in the first pressure chamber 131a.Thus, piston 132 is pushed down to the second pressure chamber 131b, and shaking table 150 declines.Now, the start oil in the second pressure chamber 131b turns back to start oil groove 120 via pipe arrangement 162 and servo-valve 140.On the other hand, when so that start oil is formed oil hydraulic circuit from the mode that pump unit 110 is sent to pipe arrangement 162, start oil is fed into the second pressure chamber 131b, presses liter in the second pressure chamber 131b.Thus, piston 132 is brought to the first pressure chamber 131a, and shaking table 150 rises.Now, the start oil in the first pressure chamber 131a 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 the pipe arrangement 163 of servo-valve 140, with linked from servo-valve 140 to the pipe arrangement 164 of start oil groove 120 by house steward 165.The start oil that pump unit 110 supplies can not all go to oil hydraulic cylinder unit 130, and some sends back to start oil groove 120 via this house steward 165.In addition, in order to prevent the adverse current of start oil in pipe arrangement 163 and 164, retaining valve 166,167 is respectively equipped with at each pipe arrangement.
Like this, in servo valve type vibration testing device, controller 102 controls servo-valve 140, periodically switch start oil delivered to the first pressure chamber 131a and the second pressure chamber 131b one of them, shaking table 150 is moved back and forth.Servo valve type oil pressure vibration testing device, oil hydraulic cylinder unit 130 is delivered to by with a part for the start oil of high pressure, large discharge circulation owing to utilizing servo-valve 140, so when carry out switching start oil delivered to the first pressure chamber 131a and the second pressure chamber 131b one of them time, the pressure delivering to the pressure chamber of start oil rises to high pressure instantaneously, the not free moving direction lingeringly switching shaking table 150.Therefore, vibration can be applied with high-frequency to shaking table.
Be provided with acceleration transducer 103 at shaking table 150, the signal of the expression acceleration that acceleration transducer 103 detects is fed into controller 102.Controller 102 according to the testing result of acceleration transducer 103, can calculate the displacement of shaking table 150, speed or acceleration, and controls servo-valve 140, shaking table 150 is vibrated with desired displacement, speed or Acceleration pulse.
Summary of the invention
Use the oil pressure actuator of servo-valve in order to desired pressure moment is stably supplied to oil hydraulic cylinder, and adopt following structure, that is, the pump that continuous drive flow is fully large, and a part for the oil pressure energy only supplied by pump is supplied to oil hydraulic cylinder.Therefore, use the energy consumption needed for the vibration testing device of this oil pressure actuator far to exceed the energy required for subject applying vibration, cause energy dissipation.In addition, in order to be made the circulation of start oil need jumbo start oil groove by this pump.
The present invention creates to solve the problem, and its object is to provide a kind of oil pressure actuator, does not need mammoth pump or start oil groove, there is high output and can react at a high speed, a kind of vibration testing device is also provided, great load can be executed to subject, with high frequency, vibration is applied to subject simultaneously.
A kind of actuator is provided according to embodiments of the present invention, possesses the oil pressure pump of start of reversing, oil hydraulic cylinder unit, first pipe arrangement and the second pipe arrangement, this oil hydraulic cylinder unit possesses piston, inner space by piston be divided into the first pressure chamber and the second pressure chamber sleeve and and piston links and end is projected into the piston rod of sleeve outside, first pressure chamber is connected to the first suction/exhousting hole by this first pipe arrangement, second pressure chamber is connected to the second suction/exhousting hole by the second pipe arrangement, oil pressure pump reversion action, thus alternately oil pressure is applied for the first and second pressure chambers, make piston up-down.This actuator also possesses house steward and the accumulator (accumulator) of link first and second pipe arrangement, and house steward midway is located at by this accumulator, the first and second pressure chambers applied to the pressure of regulation.
The oil pressure pump toward forward and reverse direction reversion action is used in the actuator of embodiments of the present invention.This oil pressure pump not via servo-valve, but is directly connected with oil hydraulic cylinder unit, to drive oil hydraulic cylinder unit.The actuator of embodiment of the present invention, owing to driving oil hydraulic cylinder unit, so do not need servo valve type mammoth pump that actuator uses or start oil groove according to the flow of start oil exported from pump and direction.In addition, according to above-mentioned reason, the energy consumption needed for the actuator of embodiment of the present invention is not large like that compared to the energy applied needed for vibration subject, so significantly can suppress energy consumption compared to servo valve type actuator.
One of feature of the oil pressure pump of reversion action, when being the direction of action reversion making pump, the pressure of start oil reduces, and the time delay about several ms can occur before this pressure fully rises.Therefore, if only had merely, pump is connected to oil hydraulic cylinder unit, then, when making the driving direction of pump reverse to switch the moving direction of shaking table, above-mentioned time delay can occur, and cannot move above-mentioned shaking table in the meantime.Therefore, subject can not be vibrated with high-frequency (tens of more than Hz), the time delay under this high-frequency can cause the impact that can not ignore.But, the actuator of embodiment of the present invention, due to the pressure that accumulator specifies the first pressure chamber of oil hydraulic cylinder unit and the applying of the second pressure chamber via house steward, even if so make the direction of action of pump reverse, start oil pressure reduces hardly, and above-mentioned time delay is very little.Therefore, the actuator of embodiment of the present invention can make subject vibrate with high frequency.
The size of accumulator to the pressure of the regulation that the first pressure chamber and the second pressure chamber apply preferably is set as larger than the minimum pressure required for the driving of oil hydraulic cylinder unit.In this situation, almost there is no the operating lag caused by oil hydraulic system.
The typical oil pressure pump that the oil pressure actuator of embodiment of the present invention uses is piston-type pump.Actuator preferably also possesses servo motor using the drive source as oil pressure pump.
In addition, the oil pressure actuator of embodiment of the present invention still can possess the sensor of the action detecting oil pressure actuator movable part (or driven object of oil pressure actuator) and control the controller of servo motor.In this situation, controller can control servo motor according to the testing result of sensor.In addition, sensor preferably comprises any one in displacement transducer, speed pickup, acceleration transducer and load sensor.In this situation, controller can control servo motor according to the testing result of sensor, by with the drive waveform piston according to the displacement of regulation, speed or acceleration.Sensor is arranged on oil pressure actuator removably.
Sensor also can comprise load sensor.In this situation, controller can control servo motor according to the testing result of sensor, makes the load detected by load sensor according to the waveform change according to regulation.
In addition, according to embodiments of the present invention, a kind of vibration testing device is provided, possesses above-mentioned oil pressure actuator and be located at the shaking table of piston rod front end.
The vibration testing device of embodiment of the present invention preferably also possesses the sensor being located at shaking table and the controller controlling servo motor.
In addition, the sensor being located at shaking table also can comprise the sensor of the displacement of measuring vibrations worktable, speed or acceleration.In this situation, controller can control servo motor according to the testing result of sensor, to drive shaking table according to the specified waveform of displacement, speed or acceleration.
In addition, sensor also can comprise the load sensor measured and put on the load of subject.In this situation, controller can control servo motor according to the testing result of sensor, to apply load according to the waveform of regulation to subject.
accompanying drawing explanation
Fig. 1 is the outline loop diagram of the vibration testing device of embodiment of the present invention.
Fig. 2 is the figure of the schematic configuration in order to apply quiescent load to subject of the vibration testing device representing embodiment of the present invention.
Fig. 3 is the acceleration of the shaking table of the embodiment of the present invention and the curve map of displacement.
Fig. 4 is the acceleration of the shaking table of comparative example and the curve map of displacement.
Fig. 5 is the outline loop diagram of the existing hydraulic type vibration testing device using servo-valve.
Embodiment
Below, use accompanying drawing that embodiments of the present invention are described.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 supplied by oil hydraulic cylinder unit 30 makes shaking table 50 move up and down, and the subject W be fixed on thus on shaking table 50 is applied in vibration.
Pump unit 10 has pump main body 11 and servo motor 12.Servo motor 12 is driven by the alternating current exported from servoamplifier 4.Servo motor 12 forms taste, and its driving shaft 12a can be made to rotate in forward and reverse direction, and can the accurate rotational speed adjusting driving shaft 12a.In addition, servo motor 12 is low inertia AC servo motors, and this motor has high output, and the reversion carrying out high-repetition-rate drives.
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 body 11, flow and the direction of the start oil that pump main body 11 supplies can be changed thus.Such as: when driving servo motor 12 with certain periodic reversal, flow and the direction of flowing through the start oil between the first suction/exhousting hole 11a and the second suction/exhousting hole 11b can periodic variations.
Oil hydraulic cylinder unit 30 has sleeve 31, in sleeve 31 can movement piston 32 and be fixed wtih shaking table 50 from the piston rod 33 that the one side of piston 32 is projected into sleeve 31 outside in the front end of piston rod 33.The inside of sleeve 31 is divided into the first pressure chamber 31a and the second pressure chamber 31b by piston 32.Start oil is filled with at the first pressure chamber 31a and the second pressure chamber 31b.In addition, the first pressure chamber 31a and the second pressure chamber 31b are connected via the first suction/exhousting hole 11a of pipe arrangement 61,62 and pump main body 11 and the second suction/exhousting hole 11b respectively.In addition, use high-pressure hose etc. are as pipe arrangement 61,62, and this high-pressure hose etc. can resist the pressure increase (about tens of MPa) (not causing elastic deformation) of the start oil occurred when making shaking table 50 move.
Start oil groove 20 is connected with the first pressure chamber 31a and the second pressure chamber 31b via retaining valve 63,64 respectively.The situation that the oil pressure (such as atmospheric pressure) of each retaining valve 63,64 respectively in the inner pressure ratio start oil groove 20 of the first pressure chamber 31a and the second pressure chamber 31b is little is opened, and start oil is supplied to pipe arrangement 61,62 from start oil groove 20.In present embodiment, when filling start oil to the first pressure chamber 31a (or second pressure chamber 31b), retaining valve 63 (or retaining valve 64) is opened, and start oil moves to pressure chamber 31a (or pressure chamber 31b) from start oil groove 20.
Specifically, the filling of start oil to each pressure chamber 31a, 31b carries out as follows.The not shown valve of exhaust is provided with at the first pressure chamber 31a and the second pressure chamber 31b.First, open the valve of the first pressure chamber 31a and the valve of closedown the second pressure chamber 31b, in this case, driving pump unit 10 delivers to the first suction/exhousting hole 11a to make start oil and air from the second suction/exhousting hole 11b.So the air in the second pressure chamber 31b and pipe arrangement 62 is overflowed via the valve of pipe arrangement 61 from the first pressure chamber 31a.Soon, the pressure of the second pressure chamber 31b and pipe arrangement 62 becomes lower than the pressure in start oil groove 20, so retaining valve 64 is opened, the start oil in start oil groove 20 is filled into the first pressure chamber 31a via pipe arrangement 62,61.
After start oil is filled into the first pressure chamber 31a, close the valve of the first pressure chamber 31a, open the valve of the second pressure chamber 31b, driving pump unit 10 delivers to the second suction/exhousting hole 11b to make start oil from the first suction/exhousting hole 11a.So the air in the second pressure chamber 31b and pipe arrangement 62 is overflowed from the valve of the second pressure chamber 31b, and in addition, piston 32 rises, and the start oil being filled in the first 31a side, pressure chamber is pushed out into pipe arrangement 61.When piston 32 rises to upper dead center, the pressure of the start oil in the first pressure chamber 31a and pipe arrangement 61 becomes lower than the pressure in start oil groove 20, so retaining valve 63 is opened, the start oil in start oil groove 20 moves to the second pressure chamber 31b via pipe arrangement 61,62.After start oil is filled in the second pressure chamber 31b, close the valve of the second pressure chamber 31b.
Below, the mechanism in the vibration testing device 1 of present embodiment, shaking table 50 being vibrated is described.When making shaking table 50 rise, driving pump unit 10 moves to the second suction/exhousting hole 11b to make start oil from the first suction/exhousting hole 11a.So start oil is supplied to the second pressure chamber 31b via pipe arrangement 62, and piston 32 is pulled to the first 31a side, pressure chamber, and piston rod 33 and shaking table 50 rise.Start oil in first pressure chamber 31a moves to pump unit 10 along with the movement of piston 32 via pipe arrangement 61, delivers to the second pressure chamber 31b from pump unit 10 via pipe arrangement 62.
When shaking table 50 is declined, driving pump unit 10 moves toward the first suction/exhousting hole 11a from the second suction/exhousting hole 11b to make start oil.Now, start oil is supplied to the first pressure chamber 31a via pipe arrangement 61, so piston 32 is pulled to the second 31b side, pressure chamber, piston rod 33 and shaking table 50 decline.Start oil in second pressure chamber 31b moves toward pump unit 10 through pipe arrangement 62 along with the movement of piston 32, then is sent to the first pressure chamber 31a from pump unit 10 through pipe arrangement 61.
As shown in Figure 1, at the shaking table 50 of the vibration testing device 1 of present embodiment, acceleration transducer 3 is installed.Acceleration transducer 3 is connected with controller 2, and acceleration transducer 3 is detected represents that the signal of acceleration is supplied to controller 2.Controller 2 calculates the displacement of shaking table 50, speed or acceleration according to the testing result of acceleration transducer 3, sets the desired value being supplied to servoamplifier 4, this desired value is delivered to servoamplifier 4 according to this result of calculation.Servoamplifier 4 generates the alternating current of the cycle set by desired value and the amplitude having and specify according to controller 2 from the electric power that power supply 5 supplies, this alternating current is outputted to servo motor 12.Vibration can be applied with the displacement such as specified, speed or acceleration amplitude to shaking table 50 according to above-mentioned process.In addition, displacement transducer or speed pickup also can be used to replace acceleration transducer 3.
Like this, the vibration testing device 1 of present embodiment is configured to, by the pump unit 10 that can drive in forward and reverse direction, start oil is supplied to the first pressure chamber 31a or the second pressure chamber 31b of oil hydraulic cylinder unit 30, make shaking table 50 move along the vertical direction thus, the subject W be fixed on this shaking table 50 is vibrated.
In addition, the vibration testing device 1 of present embodiment possesses the house steward 65 that pipe arrangement 61 and 62 is gathered and the accumulator 70 being located at house steward 65 midway.Accumulator 70 is pressure vessels, and its inside is formed with gas (drying nitrogen etc.) layer of authorised pressure, and accumulator 70 pressurizes to the first pressure chamber 31a of oil hydraulic cylinder unit 30 or the second pressure chamber 31b with certain pressure via pipe arrangement 61 and 62.
About not possessing the structure of house steward 65 and accumulator 70, the pipe arrangement (being pipe arrangement 61 when shaking table 50 rises, is pipe arrangement 62 during decline) not supplying this side of start oil becomes the low-pressure close to atmospheric level.Therefore, after after the rising of shaking table 50 and decline just switch, make the pipe arrangement of this side of supply start oil and the pressure of pressure chamber rise to the high pressure (ten ~ tens of MPa) being enough to mobile piston 32 from this low-pressure, need the time about several ms.It is the time delay of shaking table 50 not movement during this.This time delay becomes the size relative to ignoring the vibration period, so in the oil hydraulic system of this spline structure, cannot apply vibration with the high-frequency of tens of more than Hz to shaking table 50.
In the vibration testing device 1 of present embodiment, accumulator 70 pressurizes, and to make the pressure of pipe arrangement 61,62 and pressure chamber 31a, 31b maintain high pressure all the time, under this high pressure, enough driving forces can be passed to piston 32 by start oil.In other words, accumulator 70 provides high authorised pressure to the first pressure chamber 31a and the second pressure chamber 31b, makes the start in pressure chamber 31a, 31b and pipe arrangement 61,62 often remain on the state can transmitting necessary load all the time thus.Therefore, there is the time delay during structure without accumulator 70 hardly, vibration can be applied with the frequency of tens of more than Hz to shaking table 50.In addition, in order to shorten time delay as far as possible, the size of the pressure of the gas blanket of accumulator 70 that is accumulator 70 pairs of start oil applied pressures is set to larger than the minimum pressure needed for the movement of piston 32.In addition, use high-pressure hose etc. are as house steward 65, and this high-pressure hose etc. fully can resist accumulator 70 pairs of starts oil applied pressures.
In addition, the piston-type pump that the pump main body 11 of pump unit 10 uses easily is pulsed when driving.In present embodiment, carry out Absorbing Fluctuation by the accumulator 70 be located between pump unit 10 and oil hydraulic cylinder unit 30.This feature is useful when carrying out the compression test shown in Fig. 2 (a), in this compression test, between support 52 and shaking table 50, clip subject W makes shaking table 50 rise, and subject W is applied to the compression quiescent load of above-below direction.Above-mentioned feature is also similarly useful when the tension test shown in Fig. 2 (b), in this tension test, the fixture 53,54 being installed on shaking table 50 and support 52 ' is fixed on subject W, shaking table 50 is declined, subject W is applied to the stretching quiescent load of above-below direction.
In addition, also can carry out following vibration test, that is, as Fig. 2 (a) and the structure of (b), between support and shaking table, configure subject W, shaking table is moved back and forth, the load that periodic variation applies subject W.In this situation, also can arrange the load sensors such as dynamometer (load cell) at support or shaking table, controller 2 carrys out control pump unit according to the measurement result of this load sensor.Such as: can torture test be carried out, be certain mode with the amplitude of the load applied subject W, repeatedly load cycling is applied to subject W.
[embodiment]
Below, for use the vibration testing device 1 of present embodiment described above to carry out result that vibration test obtains and use the vibration testing device not possessing accumulator to carry out result that vibration test obtains is described.Fig. 3 is the acceleration of the shaking table measured and the curve map of displacement, and this measurement is at the target waveform vibration testing device 1 (embodiment) of present embodiment being provided to the sine wave of frequency 50Hz, carries out when subject W is vibrated.In addition, Fig. 4 is the acceleration of the shaking table measured and the curve map of displacement, this measurement is at the target waveform vibration testing device (comparative example) not possessing accumulator being provided to the sine wave of frequency 50Hz, carries out when subject W is vibrated.In addition, the vibration testing device of embodiment and the vibration testing device of comparative example, structurally do not have difference except the presence or absence 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 between embodiment and comparative example yet.
As shown in Figure 3, in embodiment, measure the acceleration of shaking table that obtains and the waveform of displacement presents sinusoidal wave shape, thus intimate loyalty applies to vibrate to workpiece W according to the target waveform of 50Hz.On the other hand, as shown in Figure 4, in comparative example, Acceleration pulse and the sine wave of measuring the shaking table obtained differ widely, and in addition, its amplitude is also less than 1/10th of embodiment.In addition, in comparative example, the displacement of shaking table does not almost change.
So, the vibration testing device of present embodiment can apply vibration with high-frequency to subject.
Technical scope of the present invention is not limited to above-mentioned illustrative embodiment and the concrete form of embodiment.Be use piston-type pump as the oil pressure pump of actuator in above-mentioned embodiment, but the oil pressure pump of the various modes beyond piston-type pump can be used to implement the present invention.In several embodiment of the present invention, such as, use the rotary pump such as gear-type pump or vane pump.
In addition, above-mentioned illustrative embodiment is an example, wherein by what there is in the present invention feature structure, actuator is equipped on vibration testing device, but this actuator can be equipped on various oil gear and system, the reactive or low vibration of this various oil gear and system requirements high-frequency and low noise.Such as: structure of the present invention can be used in material test apparatus, mechanical arm etc.
Symbol description
1 vibration testing device
2 controllers
3 acceleration transducers
4 servoamplifiers
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 (12)
1. an oil pressure actuator, comprising:
There is the oil pressure pump of the action of can reversing of the first suction/exhousting hole and the second suction/exhousting hole;
Possess piston, inner space be divided into the sleeve of the first pressure chamber and the 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;
Connect the first pipe arrangement of described first pressure chamber and described first suction/exhousting hole; With
Connect the second pipe arrangement of described second pressure chamber and described second suction/exhousting hole;
Described oil pressure actuator, by making described oil pressure pump reversion action, alternately applies oil pressure to described first pressure chamber and the second pressure chamber, makes described piston up-down,
The feature of this oil pressure actuator is,
Described oil pressure pump is directly connected with described oil hydraulic cylinder unit,
This oil pressure actuator also comprises:
Connect the house steward of described first pipe arrangement and the second pipe arrangement; With
Be located at the midway of described house steward, and the accumulator of the pressure of regulation applied to described first pressure chamber and the second pressure chamber,
The size of described accumulator to the pressure of the regulation that described first pressure chamber and the second pressure chamber apply is set as larger than the minimum pressure needed for the cylinder driving of described oil hydraulic cylinder unit.
2. oil pressure actuator as claimed in claim 1, is characterized in that:
Described oil pressure pump is piston-type pump.
3. oil pressure actuator as claimed in claim 1 or 2, is characterized in that:
Also possesses the servo motor driving described oil pressure pump.
4. oil pressure actuator as claimed in claim 3, is characterized in that:
Also possess the sensor of the movable part being located at oil pressure actuator and control the controller of described servo motor,
Described controller controls described servo motor according to the testing result of described sensor.
5. oil pressure actuator as claimed in claim 4, is characterized in that:
Described sensor comprises any one in displacement transducer, speed pickup, acceleration transducer,
Described controller controls described servo motor according to the testing result of described sensor, with piston described in the drive waveform according to the displacement of regulation, speed or acceleration.
6. oil pressure actuator as claimed in claim 4, is characterized in that:
Described sensor comprises load sensor,
Described controller controls described servo motor according to the testing result of described sensor, to make the load detected by described load sensor according to the waveform change specified.
7. a vibration testing device, is characterized in that, comprising:
Oil pressure actuator according to claim 1; With
Be located at the shaking table of the front end of described piston rod.
8. vibration testing device as claimed in claim 7, is characterized in that:
Described oil pressure pump is piston-type pump.
9. vibration testing device as claimed in claim 8, is characterized in that:
Also possesses the servo motor driving described oil pressure pump.
10. vibration testing device as claimed in claim 9, is characterized in that:
Also possess the sensor being located at described shaking table and the controller controlling described servo motor,
Described controller controls described servo motor according to the testing result of described sensor.
11. vibration testing devices as claimed in claim 10, is characterized in that:
Described sensor comprises the sensor of the displacement of measuring vibrations worktable, speed or acceleration,
Described controller controls described servo motor according to the testing result of described sensor, to drive described shaking table according to the specified waveform of displacement, speed or acceleration.
12. vibration testing devices as claimed in claim 10, is characterized in that:
Described sensor comprises the load sensor measured and put on the load of subject,
Described controller controls described servo motor according to the testing result of described sensor, applies load with the waveform according to regulation to described subject.
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| 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 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN102216750A CN102216750A (en) | 2011-10-12 |
| CN102216750B true CN102216750B (en) | 2014-12-31 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN200980146327.7A Active CN102216750B (en) | 2008-11-21 | 2009-07-31 | Hydraulic actuator and hydraulic vibration test device |
Country Status (5)
| 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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| CN102042847A (en) * | 2010-10-29 | 2011-05-04 | 安徽士必达液压器材有限公司 | High-voltage pulse test system |
| ES2363549B1 (en) | 2011-03-08 | 2012-03-23 | Instituto Tecnológico Del Embalaje, Transporte Y Log�?Stica | MACHINE MOVEMENT SIMULATOR PRODUCED DURING TRANSPORTATION |
| CN103016453B (en) * | 2012-12-14 | 2015-02-04 | 浙江大学 | Impulse test system of hydraulic hose |
| CN104614137B (en) * | 2015-01-15 | 2016-08-31 | 浙江大学 | Three-component standard vibration machine based on static pressure air-bearing decoupling device |
| KR101671829B1 (en) * | 2015-07-06 | 2016-11-03 | 홍국선 | Feeding Appatarus Having Gear Pump Unit and Combining Form Hydraulic Actuator Having the Same |
| DE102018214295A1 (en) | 2018-08-23 | 2020-02-27 | Stabilus Gmbh | Measurement of operating parameters on actuators |
| CN114258283A (en) * | 2019-10-31 | 2022-03-29 | 国立大学法人山形大学 | Evaluation detection device |
| CN112879359B (en) * | 2021-01-25 | 2023-04-07 | 武汉工程大学 | Displacement tracking control system and method for coal bed gas horizontal well drilling hydraulic propulsion system |
| CN114382824B (en) * | 2021-12-22 | 2024-02-20 | 北京航天希尔测试技术有限公司 | Vibration table moving part position balancing system for resisting high-speed change overload |
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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 |
| CN102216750A (en) | 2011-10-12 |
| 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 |
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