CN2821786Y - Super long storke electric vibration table - Google Patents
Super long storke electric vibration table Download PDFInfo
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- CN2821786Y CN2821786Y CNU2005200758400U CN200520075840U CN2821786Y CN 2821786 Y CN2821786 Y CN 2821786Y CN U2005200758400 U CNU2005200758400 U CN U2005200758400U CN 200520075840 U CN200520075840 U CN 200520075840U CN 2821786 Y CN2821786 Y CN 2821786Y
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Abstract
The utility model relates to a super long stroke electric vibration table which is mainly composed of a table body, a moving coil, a refrigerating device, a guide device and a drive circuit, wherein a magnetic cylinder and a field coil are arranged in the table body, and the moving coil is composed of a skeleton and a drive coil. The utility model is characterized in that the drive circuit is a position negative feedback control circuit in which the output of a given signal source is connected with a comparison superposed circuit, and the output of the comparison superposed circuit is connected with an adjustor which is connected with the drive coil of the moving coil through a power amplifier; thus, a feedback passage is formed for driving the moving coil. The moving coil is provided with a measured part, a displacement sensor is fixed on the table body, and probes of the displacement sensor face the measured part and are arranged at intervals. The output of the displacement sensor is connected with a low-pass filter, and a direct current voltage signal which is relative to the position of the moving coil is outputted after processed by the low-pass filter. The direct current voltage signal is connected with the comparison superposed circuit and is superposed with a given signal coming from the given signal source. The polarity of the direct current voltage signal is opposite to that of the given signal so as to form the feedback passage to dynamically compensate the position of the moving coil. The proposal has no mechanical hanging support in a direction of vibration so as to achieve the requirement of vibration with oversized displacement. The utility model accurately keeps the moving coil in a balanced position through the circuit, and further improves the running performance of the vibration table.
Description
Technical field
The utility model relates to vibration testing device, the electric vibration table of particularly a kind of ultra-long-stroke (big displacement).This electric vibration table can satisfy the vibration test requirement of low frequency and the displacement of high-frequency range super large.
Background technology
Electric vibration table is by constant D.C. magnetic field and is arranged in the shaking table that the electric power that interaction produced that this magnetic field is connected with the coil of certain alternating current drives.Its basic structure mainly is made up of stage body (magnetic cylinder, magnetic cylinder cap, iron core, magnetic cylinder bottom), field coil, moving-coil, mechanicalness suspension strut device and several parts such as guide piece and driving circuit.Wherein, moving-coil is made up of the skeleton of band work top and the drive coil that is wound on the skeleton as the critical piece of oscillating component.During shaking table work, in field coil, feed DC current---exciting current, then in the annular space (working gas gap) of stage body, produce very strong radial D.C. magnetic field; In hung the drive coil that is positioned among the working gas gap by mechanicalness suspension strut device and guide piece, pass to exchange current, then the drive current of this interchange and the direct current stationary magnetic field among the working gas gap interact and produce electric power---the exciting force of alternation, this exciting force is delivered to by moving coil framework on the table top that test specimen is installed, to promote the test specimen vibration.
Electric vibration table is existing till now about one-hundred-year history since being born, and its ingredient never has big variation.Particularly mechanicalness suspension strut device and guide piece, mainly be to be used for supporting moving-coil, make moving-coil remain at the center at the volley, wherein, the effect of suspension strut structure provides the mechanical vibration stroke range that a kind of moving-coil allows, and guide frame is that moving-coil direction of motion is positioned, and limits unnecessary transverse movement.At present the typical suspension strut of utilization and guide piece mainly are to realize with flexible member, such as, see the elasticity rocker arrangement shown in Fig. 1～3 and roll arm sling to mount and put.This device is upwards being installed three or four moving-coil week, has both played the effect of suspension strut moving-coil, has played guide effect again.But, owing to adopted this resilient suspension bracing or strutting arrangement, make present shaking table be subjected to considerable restraint aspect the amplitude size, in other words, because the restriction of suspension strut structure, moving-coil can only can not exceed this scope (at present, electric vibration table range in theory is 51mm peak-peak value) in theory in the mechanical trip scope internal vibration of suspension strut structure permission.On the other hand, in actual applications, owing to be subjected to the restriction of shaking table principle of work, in displacement field and speed district, the jigging platform moving coil skeleton moves in magnetic field, produce speed voltage (being commonly called as the generating effect), form the loop through skeleton, and produce a kind of power that hinders moving-coil motion, this power is in the jigging platform moving coil motion process, its size shows as numerical value that moving coil framework enters the magnetic field air gap and leaves the numerical value of air-gap field greater than moving coil framework, and its external manifestation is: moving-coil is at speed and displacement field, and moving-coil is to direction+drift of leaving air gap, the moving-coil effective travel is reduced a lot, such as: stroke is the shaking table of 51mm peak-peak value, and when continuous frequency sweep, its effective travel only is 38mm.
Along with the development of technology, also more and more higher to the requirement of vibration test, wherein the demand that product is carried out big stroke amplitude vibration test is exactly one of them.Yet owing to be subjected to the limited of drive mechanism, all at present electric vibration testing benchs, the maximum vibration stroke that can provide only are 51mm peak-peak value at home.Understand according to the applicant, have amplitude to reach the big stroke vibration testing equipment of 100mm (4 inches) abroad, but it can only work under with interior low-frequency vibration condition at 200 hertz, and can be still blank at the big stroke or the super large stroke electric vibration table of high band operation.
Summary of the invention
The purpose of this utility model provides a kind of ultra-long-stroke electric vibration table that can carry out work at low frequency and high frequency, to satisfy the needs of vibration test technical development.
For achieving the above object, the technical solution adopted in the utility model is: a kind of ultra-long-stroke electric vibration table, mainly form, comprise magnetic cylinder and field coil in the stage body, and be provided with the annular working air gap by several parts of stage body, moving-coil, cooling device, guide piece and driving circuit; Moving-coil is made up of the skeleton of band work top and the drive coil that is wound on the skeleton; Moving-coil is located on the stage body by guide piece, and wherein, drive coil is arranged in the annular working air gap of stage body, it is characterized in that:
The relative stage body of described moving-coil freely the connecting of no suspension strut on direction of vibration;
Described driving circuit is a position negative feedback control circuit, and this position negative feedback control circuit comprises given signal source, comparison supercircuit, regulator, power amplifier, displacement transducer and low-pass filter; The output of given signal source inserts relatively supercircuit, and relatively supercircuit output connects a regulator, and regulator output connects the drive coil of moving-coil again through power amplifier, constitute the suitable feedthrough road of position negative feedback control circuit with this; Be provided with a tested part on moving-coil, displacement transducer is fixed on the stage body, and its probe is in the face of the tested part layout of being separated by; Displacement transducer output connects low-pass filter, after handling, exports by low-pass filter a d. c. voltage signal relevant with the moving-coil position, this d. c. voltage signal inserts relatively supercircuit and superimposed from the given signal of given signal source, this d. c. voltage signal is opposite with given signal polarity, constitutes the feedback channel of position negative feedback control circuit with this.
Related content in the technique scheme is explained as follows:
1, in the such scheme, described " the relative stage body of moving-coil freely connects in no suspension strut on the direction of vibration " is meant that the relative stage body of moving-coil is on direction of vibration, cancelled original mechanicalness suspension strut structure, made moving-coil on whole overlength stroke vibration direction, keep free state.
2, in the such scheme, skid off stage body for moving-coil is unlikely, the end positions of vibrating at ultra-long-stroke is provided with stop means.Wherein, when moving-coil is in plumbness,, be provided with support air bag or flexible member in the lower end of moving-coil in order under static state, moving-coil to be supported.
3, in the such scheme, described regulator specifically can adopt proportional and integral controller, and promptly pi regulator is proofreaied and correct with this phase lag to signal.
4, in the such scheme,, can adopt following concrete scheme for ease of the detection of displacement: fixed installation one wedge type block on the moving-coil periphery, and with the inclined-plane of wedge type block towards the probe of the displacement transducer layout of being separated by, inclined-plane oblique consistent with the table vibration direction; With the measurand of this wedge type block as displacement transducer.As shown in Figure 5, when moving-coil moves up and down, wedge type block is movement therewith also, its inclined-plane also changes with the distance of fixed object in the horizontal direction, can derive, and the moving displacement amount of establishing the moving-coil vertical direction is Δ Y, carve the inclined-plane of piece and the horizontal range variable quantity between displacement sensor probe is Δ X, Δ Y=b/a Δ X then, b and a are that available a small amount of journey displacement transducer is measured big displacement as shown like this.
5, in the such scheme, described displacement transducer is a non-contact displacement transducer, specifically can adopt eddy current sensor, inductance type transducer, infrared type sensor, ultrasonic sensor, laser type sensor etc.
The utility model design concept is:
The first, only be connected between moving-coil and the stage body by guide piece, on direction of vibration, adopt no suspension strut freely to connect, promptly do not establish mechanicalness suspension strut device, create conditions for reaching the overlength stroke vibration.Because the structure of existing band mechanicalness suspension strut device can only carry out work in the mechanical trip scope that the suspension strut device allows, and the maximum vibration stroke that present mechanicalness suspension strut device can provide only is 51mm peak-peak value.Therefore, can't realize the overlength stroke vibration.
The second, adopt the position negative feedback control circuit, realize control in conjunction with the inclined-plane of wedge type block and displacement transducer to position, the centre of oscillation.Its principle of work is as follows:
Whole negative feedback control circuit as shown in Figure 4, wherein given signal source (being given link), the position of the alternating signal decision jigging platform moving coil of its output, this position can overlap with the moving-coil equilibrium position, also can not overlap.
Displacement transducer detects the position signalling of moving-coil, not only contains AC signal but also contain direct current signal in this signal, and the size of AC signal has reflected the vibration displacement amplitude of moving-coil, can be used for indicating the moving-coil displacement; The size of direct current signal has reflected the position of moving-coil, the purpose of the utility model negative feedback loop is the centre of motion that will keep moving-coil, be major control be position signalling direct current signal just, therefore shaking table range signal (AC signal) should be removed, so insert low-pass filter (filtering link).The effect of low-pass filter is: displacement sensor output signal is carried out filtering, reject useless AC signal, remain with the direct current signal of usefulness.
(machinery, electromagnetism) link because the approximate inertia of moving-coil, its motion and given signal exist amplitude and phase differential (hysteresis), for making system have best quality, so insert a regulator (correction link), this regulator limits the enlargement factor of Dynamic Signal, and stationary singnal is carried out bigger amplification and what is called " before pre-" control, thereby being timed by stagnating, jigging platform moving coil becomes quick.The effect of regulator is: the enlargement factor of Dynamic Signal limits, and stationary singnal is carried out bigger amplification, promptly carries out the correction of phase lag.
Because the signal of regulator output is faint, also need be amplified to enough degree, so go back access power amplifier (being amplifying element), transfer regulator output signal after amplifying element amplifies, enter the jigging platform moving coil drive coil, having finished the transition process of voltage → electric current → power → displacement here, in fact is exactly to have finished the process that electric energy becomes mechanical energy.
Because the technique scheme utilization, the utility model compared with prior art has following advantage:
1, the utility model can be realized the overlength stroke vibration amplitude of 100mm in 0～2700 hertz of frequency range.This is a kind of new breakthrough for electric vibration table, has also filled up domestic and international blank in the art, therefore has outstanding substantive distinguishing features and significant technical progress.
2, driving circuit of the present utility model has adopted the position negative feedback, and the dynamic deviation of moving-coil is carried out quantitatively accurate dynamic compensation, has accurately guaranteed the mobile equilibrium of moving-coil from the circuit; Through trying out the electric vibration table in 100mm, detect the back and find: in unloaded or loading 180kg load, in frequency sweep work, the moving-coil equilibrium position changes less than 2mm, and from control performance, error only is 2%.
3, because driving circuit of the present utility model has adopted the position negative feedback, substituted the effect of original suspension strut device with this circuit, can remove the suspension strut device, only need guide piece to get final product, simplified the physical construction of shaking table, prolong serviceable life and failure rate, improved every performance of shaking table operation.
Description of drawings
Accompanying drawing 1 is existing a kind of suspension strut schematic representation of apparatus;
Accompanying drawing 2 is the schematic top plan view of accompanying drawing 1;
Accompanying drawing 3 is existing another kind of suspension strut schematic representation of apparatus;
Accompanying drawing 5 is the synoptic diagram of the utility model moving-coil voussoir and displacement transducer relevant position.
In the above accompanying drawing: 1, moving-coil; 2, stage body; 3, displacement transducer; 4, wedge type block; 5, elastic component.
Embodiment
Below in conjunction with drawings and Examples the utility model is further described:
Embodiment: a kind of ultra-long-stroke electric vibration table, mainly form by stage body 2, moving-coil 1, cooling device, guide piece and several parts of driving circuit.Comprise magnetic cylinder and field coil in the stage body 2, and be provided with the annular working air gap.Moving-coil 1 is made up of the skeleton of band work top and the drive coil that is wound on the skeleton.Moving-coil 1 is located on the stage body 2 by guide piece, and wherein, drive coil is arranged in the annular working air gap of stage body 2.Guide piece is made up of last guiding mechanism and lower guide mechanism two parts, wherein, last guiding mechanism adopts guide roller, promptly circumferentially is embedded four guide rollers at stage body 2 and 1 edge of moving-coil, the rotation direction of this guide roller is a vertical direction up and down, limits moving-coil 1 with this and can only upper and lowerly vibrate.In order to realize the vibration of ultra-long-stroke, moving-coil 1 relative stage body 2 adopts freely connecting of no suspension strut on direction of vibration, does not promptly establish mechanicalness suspension strut device.But skid off stage body 2 for moving-coil is unlikely, be provided with stop means at moving-coil 1 relative stage body 2 in the end positions of ultra-long-stroke vibration, wherein, the stop means of lower end is a support air bag.
Shown in accompanying drawing 4, described driving circuit is a position negative feedback control circuit, and this position negative feedback control circuit comprises given signal source, comparison supercircuit, pi regulator (proportional and integral controller), power amplifier, displacement transducer and low-pass filter.The output of given signal source inserts relatively supercircuit, and relatively supercircuit output connects a pi regulator, and pi regulator output connects the drive coil of moving-coil again through power amplifier, constitutes along the feedthrough road with this; Displacement transducer output connects low-pass filter, after handling, exports by low-pass filter a d. c. voltage signal relevant with the moving-coil position, this d. c. voltage signal inserts relatively supercircuit and superimposed from the given signal of given signal source, this d. c. voltage signal is opposite with given signal polarity, constitutes feedback channel with this.
As shown in Figure 5, displacement transducer 3 set-up modes are as follows: be installed with a wedge type block 4 on moving-coil 1 periphery, it vertically is provided with its inclined-plane, and towards the probe of displacement transducer 3, relative with probe.
Referring to accompanying drawing 4, shown in the accompanying drawing 5, the course of work of position negative feedback driving circuit is: suppose that given signal source output is constant, when jigging platform moving coil 1 because of duty, extraneous factors such as support load change when causing the moving-coil equilibrium point to change (supposition is drift upwards), wedge type block 4 also with on float, displacement transducer 3 detects wedge type block 4 to be departed from+Δ X, through circuit conversion Δ Y=b/a Δ X, promptly obtain moving-coil and depart from+Δ Y, this signal is sued for peace with the given signal of given signal source output after low-pass filter is handled again, make error be Δ D ↓, after power amplifier amplifies be U ↓, the jigging platform moving coil DC current ↓, moving-coil displacement Y ↓, moving-coil 1 is got back to the equilibrium position, if moving-coil 1 departs from the equilibrium position down, then above-mentioned adjustment process changes in the opposite direction, finally make moving-coil upwards go back up to the equilibrium position, this displacement control device is adapted to all electric vibration tables, in use only need be adjusted accordingly the parameter of regulator to get final product.
Described displacement transducer is a non-contact displacement transducer, specifically can adopt eddy current sensor.
The foregoing description only is explanation technical conceive of the present utility model and characteristics, and its purpose is to allow the personage who is familiar with this technology can understand content of the present utility model and enforcement according to this, can not limit protection domain of the present utility model with this.All equivalences of being done according to the utility model spirit change or modify, and all should be encompassed within the protection domain of the present utility model.
Claims (5)
1, a kind of ultra-long-stroke electric vibration table mainly is made up of several parts of stage body, moving-coil, cooling device, guide piece and driving circuit, comprises magnetic cylinder and field coil in the stage body, and is provided with the annular working air gap; Moving-coil is made up of the skeleton of band work top and the drive coil that is wound on the skeleton; Moving-coil is located on the stage body by guide piece, and wherein, drive coil is arranged in the annular working air gap of stage body, it is characterized in that:
The relative stage body of described moving-coil freely the connecting of no suspension strut on direction of vibration;
Described driving circuit is a position negative feedback control circuit, and this position negative feedback control circuit comprises given signal source, comparison supercircuit, regulator, power amplifier, displacement transducer and low-pass filter; The output of given signal source inserts relatively supercircuit, and relatively supercircuit output connects a regulator, and regulator output connects the drive coil of moving-coil again through power amplifier, constitute the suitable feedthrough road of position negative feedback control circuit with this; Be provided with a tested part on moving-coil, displacement transducer is fixed on the stage body, and its probe is in the face of the tested part layout of being separated by; Displacement transducer output connects low-pass filter, after handling, exports by low-pass filter a d. c. voltage signal relevant with the moving-coil position, this d. c. voltage signal inserts relatively supercircuit and superimposed from the given signal of given signal source, this d. c. voltage signal is opposite with given signal polarity, constitutes the feedback channel of position negative feedback control circuit with this.
2, ultra-long-stroke electric vibration table according to claim 1 is characterized in that: the relative stage body of described moving-coil is provided with stop means in the end positions of ultra-long-stroke vibration.
3, ultra-long-stroke electric vibration table according to claim 2 is characterized in that: described moving-coil is under vertical duty, and the stop means of its lower end is support air bag or flexible member.
4, no suspension strut device electric vibration table according to claim 1, it is characterized in that: described regulator is a proportional and integral controller.
5, no suspension strut device electric vibration table according to claim 1, it is characterized in that: described tested part is its wedge type block, it is fixedly installed on the moving-coil periphery, and with its inclined-plane towards the probe of the displacement transducer layout of being separated by, inclined-plane oblique consistent with the table vibration direction.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNU2005200758400U CN2821786Y (en) | 2005-09-21 | 2005-09-21 | Super long storke electric vibration table |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNU2005200758400U CN2821786Y (en) | 2005-09-21 | 2005-09-21 | Super long storke electric vibration table |
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| Publication Number | Publication Date |
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| CN2821786Y true CN2821786Y (en) | 2006-09-27 |
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| Application Number | Title | Priority Date | Filing Date |
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| CNU2005200758400U Expired - Fee Related CN2821786Y (en) | 2005-09-21 | 2005-09-21 | Super long storke electric vibration table |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103925940A (en) * | 2014-05-13 | 2014-07-16 | 苏州东菱振动试验仪器有限公司 | Low frequency calibration vibrating table |
| CN105300640A (en) * | 2015-12-03 | 2016-02-03 | 苏州东菱振动试验仪器有限公司 | Long-stroke drive coil structure for electrodynamic vibration generator |
| CN106404160A (en) * | 2016-06-30 | 2017-02-15 | 国网重庆市电力公司电力科学研究院 | Power transmission line monitoring device metering system and method in field environment |
| CN112098028A (en) * | 2020-09-14 | 2020-12-18 | 浙江埃特斯力试验设备有限公司 | Stroke-variable precision moving coil for vibrating table |
-
2005
- 2005-09-21 CN CNU2005200758400U patent/CN2821786Y/en not_active Expired - Fee Related
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103925940A (en) * | 2014-05-13 | 2014-07-16 | 苏州东菱振动试验仪器有限公司 | Low frequency calibration vibrating table |
| CN103925940B (en) * | 2014-05-13 | 2016-04-27 | 苏州东菱振动试验仪器有限公司 | A kind of low-frequency calibration shaking table |
| CN105300640A (en) * | 2015-12-03 | 2016-02-03 | 苏州东菱振动试验仪器有限公司 | Long-stroke drive coil structure for electrodynamic vibration generator |
| CN106404160A (en) * | 2016-06-30 | 2017-02-15 | 国网重庆市电力公司电力科学研究院 | Power transmission line monitoring device metering system and method in field environment |
| CN106404160B (en) * | 2016-06-30 | 2019-10-15 | 国网重庆市电力公司电力科学研究院 | Power transmission line monitoring device metering system and method under a kind of site environment |
| CN112098028A (en) * | 2020-09-14 | 2020-12-18 | 浙江埃特斯力试验设备有限公司 | Stroke-variable precision moving coil for vibrating table |
| CN112098028B (en) * | 2020-09-14 | 2022-03-01 | 浙江埃特斯力试验设备有限公司 | Stroke-variable precision moving coil for vibrating table |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20060927 Termination date: 20140921 |
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| EXPY | Termination of patent right or utility model |