CN113606469B - Vibration exciter working frame capable of realizing hemispherical excitation - Google Patents
Vibration exciter working frame capable of realizing hemispherical excitation Download PDFInfo
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- CN113606469B CN113606469B CN202110920845.2A CN202110920845A CN113606469B CN 113606469 B CN113606469 B CN 113606469B CN 202110920845 A CN202110920845 A CN 202110920845A CN 113606469 B CN113606469 B CN 113606469B
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- 230000005284 excitation Effects 0.000 title claims abstract description 49
- 238000000034 method Methods 0.000 claims abstract description 10
- 230000008569 process Effects 0.000 claims abstract description 10
- 230000008859 change Effects 0.000 abstract description 16
- 238000009434 installation Methods 0.000 abstract description 11
- 230000002688 persistence Effects 0.000 abstract description 7
- 238000012360 testing method Methods 0.000 description 13
- 230000007306 turnover Effects 0.000 description 6
- 235000004443 Ricinus communis Nutrition 0.000 description 4
- 239000000463 material Substances 0.000 description 3
- 229910000831 Steel Inorganic materials 0.000 description 2
- 238000013461 design Methods 0.000 description 2
- 238000002474 experimental method Methods 0.000 description 2
- 230000001737 promoting effect Effects 0.000 description 2
- 230000004044 response Effects 0.000 description 2
- 239000010959 steel Substances 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000002349 favourable effect Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
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- 238000006467 substitution reaction Methods 0.000 description 1
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Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16M—FRAMES, CASINGS OR BEDS OF ENGINES, MACHINES OR APPARATUS, NOT SPECIFIC TO ENGINES, MACHINES OR APPARATUS PROVIDED FOR ELSEWHERE; STANDS; SUPPORTS
- F16M11/00—Stands or trestles as supports for apparatus or articles placed thereon ; Stands for scientific apparatus such as gravitational force meters
- F16M11/42—Stands or trestles as supports for apparatus or articles placed thereon ; Stands for scientific apparatus such as gravitational force meters with arrangement for propelling the support stands on wheels
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16M—FRAMES, CASINGS OR BEDS OF ENGINES, MACHINES OR APPARATUS, NOT SPECIFIC TO ENGINES, MACHINES OR APPARATUS PROVIDED FOR ELSEWHERE; STANDS; SUPPORTS
- F16M11/00—Stands or trestles as supports for apparatus or articles placed thereon ; Stands for scientific apparatus such as gravitational force meters
- F16M11/02—Heads
- F16M11/04—Means for attachment of apparatus; Means allowing adjustment of the apparatus relatively to the stand
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16M—FRAMES, CASINGS OR BEDS OF ENGINES, MACHINES OR APPARATUS, NOT SPECIFIC TO ENGINES, MACHINES OR APPARATUS PROVIDED FOR ELSEWHERE; STANDS; SUPPORTS
- F16M11/00—Stands or trestles as supports for apparatus or articles placed thereon ; Stands for scientific apparatus such as gravitational force meters
- F16M11/02—Heads
- F16M11/04—Means for attachment of apparatus; Means allowing adjustment of the apparatus relatively to the stand
- F16M11/06—Means for attachment of apparatus; Means allowing adjustment of the apparatus relatively to the stand allowing pivoting
- F16M11/10—Means for attachment of apparatus; Means allowing adjustment of the apparatus relatively to the stand allowing pivoting around a horizontal axis
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16M—FRAMES, CASINGS OR BEDS OF ENGINES, MACHINES OR APPARATUS, NOT SPECIFIC TO ENGINES, MACHINES OR APPARATUS PROVIDED FOR ELSEWHERE; STANDS; SUPPORTS
- F16M11/00—Stands or trestles as supports for apparatus or articles placed thereon ; Stands for scientific apparatus such as gravitational force meters
- F16M11/02—Heads
- F16M11/18—Heads with mechanism for moving the apparatus relatively to the stand
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16M—FRAMES, CASINGS OR BEDS OF ENGINES, MACHINES OR APPARATUS, NOT SPECIFIC TO ENGINES, MACHINES OR APPARATUS PROVIDED FOR ELSEWHERE; STANDS; SUPPORTS
- F16M11/00—Stands or trestles as supports for apparatus or articles placed thereon ; Stands for scientific apparatus such as gravitational force meters
- F16M11/20—Undercarriages with or without wheels
- F16M11/24—Undercarriages with or without wheels changeable in height or length of legs, also for transport only, e.g. by means of tubes screwed into each other
- F16M11/26—Undercarriages with or without wheels changeable in height or length of legs, also for transport only, e.g. by means of tubes screwed into each other by telescoping, with or without folding
- F16M11/32—Undercarriages for supports with three or more telescoping legs
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- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Apparatuses For Generation Of Mechanical Vibrations (AREA)
Abstract
The invention relates to the technical field of mounting equipment of vibration exciters, in particular to a vibration exciter working frame capable of realizing hemispherical excitation. The base of the adjusting seat component in the working frame is connected with the bracket component. The base is provided with an arc-shaped slideway for the workbench to slide. An arc-shaped positioning rack is arranged between the pair of arc-shaped slide ways. The bottom of the workbench is provided with a limit support with a limit gear. The limiting gear is meshed with the arc-shaped positioning rack. The power end of the driving device is connected with the limit gear. The bracket component comprises a flat plate and a support column. The flat plate is placed at the head end of the support column. The base is connected with the support column through a flat plate. The support column has the extending structure of adjusting the flat plate height. The tail end of the support column is provided with a trundle. In the process of implementing vibration mode analysis on structural members with large curvature change, the working frame optimizes the installation and adjustment structure of the vibration exciter, improves the excitable range of the vibration exciter and ensures the stability and the persistence of the excitation force applied by the vibration exciter.
Description
Technical Field
The invention relates to the technical field of mounting equipment of vibration exciters, in particular to a vibration exciter working frame capable of realizing hemispherical excitation.
Background
The vibration exciter is a device which is attached to mechanical equipment and used for generating excitation force, and can enable an excitation piece to obtain a certain vibration quantity with a certain form and size, so that the vibration exciter can be used for carrying out vibration and strength test on an object. At present, when an analysis test of vibration modes and the like is performed on a mechanical structure, a test method of single-point excitation multi-point response is generally adopted by a vibration exciter, each measuring point is excited by the vibration exciter, and then the vibration modes and the like of the structure are analyzed according to the response of each measuring point of a structural member.
The conventional vibration exciter device is usually provided with a tray, the semicircular arc area can be excited randomly around the rotating shaft, and the tray has a certain vertical height and cannot move freely in a plane. For experiments with multiple point excitations of different heights, moving and fixing the exciter is cumbersome. For structural members with larger curvature change, the excitation area of the semicircular arc of the conventional exciter has too high requirement on the installation of the exciter, and a plurality of inconveniences are brought to operators. Therefore, the vibration exciter has a larger excitation range and can be stably installed in engineering experiments.
Through searching, a simple hoisting device of a six-degree-of-freedom vibration exciter is disclosed in a Chinese patent document CN 106185733B. The hoisting device comprises a square frame consisting of four supporting trusses and eight horizontal trusses, wherein the four supporting trusses are internally provided with slide ways. Steering wheels are respectively arranged at four corners of the lower end of the square frame. Two position-adjustable horizontal sectional materials are arranged on the upper end face of the square frame. Two lifting lugs I are arranged on each horizontal section bar. Each lifting lug is hinged with a threaded locking member. The ends of the four threaded locking members are hinged with four second lifting lugs respectively, and the four second lifting lugs are arranged on the vibration exciter. The device utilizes the structural characteristics of the horizontal installation truss, realizes the hoisting of vibration exciters with different measuring levels, and can determine the rationalization of the installation position of the vibration exciter by adjusting the connection relation among the components, thereby ensuring the stable and safe operation of the vibration exciter in the air.
However, when the hoisting device performs vibration mode analysis on a structural member with large curvature change, the installation position of the vibration exciter is difficult to adjust, so that the excitation direction of the vibration exciter is perpendicular to the contact surface with the structural member, and the effectiveness of a test result is affected. In other words, the lifting device can only coincide the contact point of the vibration exciter with the measuring point on the structural member in space, and cannot adjust the exciting direction of the measuring point on the structural member.
In summary, in the process of implementing vibration mode analysis on a structural member with large curvature change, how to design an installation and adjustment device for a vibration exciter so as to excite excitation points of the structural member at various heights of the vibration exciter, and meanwhile, to generate exciting force on a hemispherical surface at the same height, thereby ensuring stability and persistence of the exciting force applied by the vibration exciter to the structural member with large curvature change is a technical problem to be solved by those skilled in the art.
Disclosure of Invention
The invention aims to provide an installation and adjustment device for a vibration exciter in the process of carrying out vibration mode analysis on a structural member with large curvature change, which is used for exciting excitation points of the structural member at various heights of the vibration exciter, and meanwhile, exciting force can be generated on a hemispherical surface at the same height, so that stability and persistence of the exciting force applied by the vibration exciter to the structural member with large curvature change are ensured.
In order to achieve the above purpose, the present invention adopts the following scheme: the working frame of the vibration exciter capable of realizing hemispherical excitation comprises an adjusting seat part and a bracket part;
The adjusting seat part comprises a driving device, a base and a workbench for connecting a tray of the vibration exciter, wherein the base is connected with the bracket part, an arc slideway for sliding the workbench is arranged on the base, a pair of arc slideways are symmetrically distributed along the central line of the base, an arc positioning rack is arranged between the pair of arc slideways, a limiting support is arranged at the bottom of the workbench, a limiting gear is arranged on the limiting support, the limiting gear is meshed with the arc positioning rack, and the power end of the driving device is connected with the limiting gear;
the support component comprises a flat plate and a support column, wherein the flat plate is arranged at the head end of the support column, the base is connected with the support column through the flat plate, the support column is provided with a telescopic structure for adjusting the height of the flat plate, and the tail end of the support column is provided with casters.
Preferably, the support component is provided with a plurality of support columns, fixing columns are arranged between the support columns, spherical joints are arranged at the head ends of the support columns, and spherical notches matched with the spherical joints are arranged at the bottoms of the flat plates. The fixing columns connected between the support columns greatly improve the overall rigidity of the support components, the natural frequency of the vibration exciter working frame is reduced, the vibration exciter is convenient to excite each measuring point on a structural member to be detected, the flat plates are connected with the support columns through the spherical joints, the angle between the flat plates and the support columns is convenient to change, the support structure of the support components for adjusting seat components is optimized for the structural member with large curvature change, and the excitation direction of the vibration exciter is more in accordance with actual requirements.
Preferably, the fixed column is connected to the support column by a pipe clamp. So set up, the pipe clamp is convenient for the fixed column quick assembly between many spinal branch daggers, when promoting support part rigidity, to the structure of different structure, through utilizing the pipe clamp to add the support column in the different positions of support column, promoted the diversity of support part on the bearing structure form.
Preferably, the support column comprises a first circular tube, a second circular tube and a third circular tube, the first circular tube is sleeved in the second circular tube, the second circular tube is sleeved in the third circular tube, the head end of the first circular tube is connected with the flat plate, the tail end of the third circular tube is connected with the truckle through the connecting seat, limit holes are formed in the side walls of the first circular tube, the second circular tube and the third circular tube, and limit columns are arranged in the limit holes. So set up, all have first pipe, second pipe and the third pipe and the limit post in spacing hole and constitute the extending structure of support column, peg graft in different spacing holes through the limit post to and the cooperation in different spacing holes between the pipe can realize the regulation to support column length, and then realize adjusting the regulation of seat part height, thereby accomplish the location of the contact point of vibration exciter in the direction of height.
Preferably, the driving device is a motor, the motor is connected with the limiting support through a fixed seat, the power end of the motor is connected with the limiting gear, and a button for controlling the motor is arranged on the base. The device is convenient for the workbench to finish the adjustment of the overturning angle of the workbench along the arc-shaped slideway under the drive of the motor, is favorable for the vibration exciter to quickly adjust the excitation direction, and further reduces the difficulty of clamping and positioning the vibration exciter in the vibration mode analysis process.
Preferably, the driving device is a manual rocker, and the power end of the manual rocker is connected with the limiting gear. So set up, when motor drive workstation upset, also can realize the fine setting to workstation flip angle through the mode of rotating manual rocker, further improved vibration exciter mounted position's position accuracy, and then promoted the validity of test result.
Preferably, the base is provided with a scale plate, the scale plate is provided with scale marks for marking the rotation angle of the workbench along the arc-shaped slideway, and the scale marks are distributed on the scale plate at equal intervals. The setting makes the turned position of workstation more accurate on the one hand, and on the other hand is convenient for record the turned position of workstation to this is the reference, can in time revise the deviation of turned position in the test process, has further promoted the validity of test result.
Preferably, the castor is a self-locking castor. The vibration exciter working frame is convenient to lock after moving and adjusting the position on the horizontal plane, and stability of the bracket component is further improved.
Preferably, the arc-shaped slide way is an arc-shaped slide way, and the arc-shaped positioning rack is an arc-shaped positioning rack. The arc-shaped slideway can limit the workbench to rotate along the arc track after the height position of the workbench is determined, so that the vibration exciter can generate exciting force in the hemispherical surface, and the stability and the persistence of the vibration exciter for applying the exciting force to the structural member with large curvature change are further ensured.
When the working frame of the vibration exciter capable of realizing hemispherical excitation is used, firstly, a proper number of support columns are selected according to test requirements, support components of corresponding support structures are assembled, and a self-contained tray of the vibration exciter is connected with a working table. When the workbench reaches the designated position, the contact point of the vibration exciter is adjusted to be abutted against the structural member. When the excitation point position changes, the height of the workbench is adjusted through the telescopic structure of the support column, the workbench is fixed again at the position where the height is needed, the vertical height of the vibration exciter is changed, and the vibration excitation task is completed for the new excitation point. When the structural member is a curved surface, the relative angle between the vibration exciter and the horizontal plane is required to be adjusted, the manual rocker is rotated according to the scale plate on the base, the overturning angle of the workbench is accurately adjusted, and after the required position is reached, the workbench is locked, so that the excitation direction of the vibration exciter is relatively perpendicular to the surface of the structural member, and effective exciting force is generated.
Compared with the prior art, the vibration exciter working frame capable of realizing hemispherical excitation has the following outstanding substantial characteristics and remarkable progress:
1. The base in the vibration exciter working frame capable of realizing hemispherical excitation is provided with the arc-shaped slideway, the power end of the driving device drives the working table to turn over along the arc-shaped slideway, in the process of implementing vibration mode analysis on a structural member with large curvature change, the installation and adjustment structure of the vibration exciter is optimized, the excitation range of the vibration exciter is improved, the excitation force of the vibration exciter on the hemispherical surface can be generated by the bracket part on the same height, and the stability and the persistence of the excitation force applied by the vibration exciter to the structural member with large curvature change are ensured;
2. The telescopic structure of the support column in the vibration exciter working frame capable of realizing hemispherical excitation is used for adjusting the length of the support column, further, the height of the working table is adjusted, besides the adjustment can be carried out at different heights and different horizontal positions, when the structural member is a curved surface with larger curvature, the turnover angle of the working table can be adjusted, so that the contact point of the vibration exciter can obtain offset of a corresponding angle and is mutually perpendicular to the structural member, more stable and effective exciting force is provided, and the effectiveness of engineering test results is ensured.
Drawings
FIG. 1 is a schematic perspective view of a working frame of a vibration exciter capable of realizing hemispherical excitation in an embodiment of the invention;
FIG. 2 is a schematic perspective view of the fifth wheel assembly;
FIG. 3 is a front view of FIG. 2;
FIG. 4 is a schematic perspective view of a bracket assembly;
FIG. 5 is a schematic perspective view of a supported structure;
FIG. 6 is a schematic perspective view of the first circular tube;
FIG. 7 is a schematic perspective view of a pipe clamp;
Fig. 8 is a schematic perspective view of a self-locking castor.
Reference numerals: the vibration exciter 1, the tray 2, the adjusting seat part 3, the supporting column 4, the fixing column 5, the pipe clamp 6, the trundles 7, the flat plate 8, the screw 9, the nut 10, the limiting hole 11, the workbench 12, the manual rocker 13, the base 14, the motor 15, the threaded hole 16, the limiting support 17, the arc-shaped positioning rack 18, the button 19, the scale plate 20, the first circular pipe 21, the second circular pipe 22, the third circular pipe 23, the self-locking universal wheel 24, the spherical joint 25 and the arc-shaped slideway 26.
Detailed Description
The following detailed description of specific embodiments of the invention refers to the accompanying drawings.
The working frame of the vibration exciter, which is shown in figures 1-8, can realize hemispherical excitation, and is used for installing and adjusting the vibration exciter in the process of carrying out vibration mode analysis on a structural member with large curvature change. According to the vibration exciter working frame, the arc-shaped slide way is arranged on the base of the adjusting seat component, the power end of the driving device drives the working table to turn over along the arc-shaped slide way, the installation adjusting structure of the vibration exciter is optimized, the excited range of the vibration exciter is improved, the vibration exciter can generate exciting force on the hemispherical surface on the same height, and the stability and the persistence of the vibration exciter for applying exciting force to a structural member with large curvature change are ensured.
As shown in fig. 1, a vibration exciter work frame capable of realizing hemispherical excitation comprises an adjusting seat part 3 and a bracket part. The bracket component is used as a supporting structure of the adjusting seat component 3 and is used for adjusting the position of the vibration exciter 1 in the horizontal plane and the height of the vibration exciter 1 relative to the ground. In this way, the support component enables the contact point of the vibration exciter 1 to be in contact with the surface of the structural member to be detected, the preliminary positioning of the contact point is realized, and the efficiency of installation and arrangement of the vibration exciter 1 is improved.
As shown in fig. 2, the saddle member 3 includes a driving device, a base 14, and a table 12 to which the tray 2 of the exciter 1 is connected. The base 14 is connected to the bracket member. The base 14 is provided with an arcuate slide 26 for sliding movement of the table 12. A pair of arcuate slides 26 are symmetrically distributed along the centerline of the base 14. An arcuate positioning rack 18 is disposed between a pair of arcuate slides 26. The bottom of the workbench 12 is provided with a limit support 17. The limit support 17 is provided with a limit gear. The limit gear is meshed with the arc-shaped positioning rack 18. The power end of the driving device is connected with the limit gear. The rotation axis of the tray 2 is perpendicular to the horizontal plane, and the rotation axis of the tray 2 is perpendicular to the turning axis of the workbench 12, so that the vibration exciter realizes vibration excitation in a hemispherical range.
As shown in fig. 3, the base 14 is provided with a scale plate 20. The scale plate 20 is provided with scale marks for marking the rotation angle of the workbench 12 along the arc-shaped slideway 26. The graduation marks are arranged on the graduation board 20 at equal intervals. By the arrangement, on one hand, the overturning position of the workbench 12 is more accurate; on the other hand, the turnover position of the workbench 12 is convenient to record, and the turnover position deviation can be corrected in time in the test process by taking the turnover position as a reference standard, so that the effectiveness of the test result is further improved.
As shown in fig. 1 in combination with fig. 4, the bracket member comprises a flat plate 8 and a support column 4. A flat plate 8 is placed at the head end of the support column 4. The base 14 is connected to the support column 4 by a plate 8. The support column 4 has a telescopic structure for adjusting the height of the flat plate 8. The tail end of the support column 4 is provided with a castor 7.
Wherein the bracket part has a plurality of support columns 4. Fixing columns 5 are arranged between the support columns 4. The head end of the support column 4 is provided with a ball joint 25. The bottom of the plate 8 is provided with a spherical slot matching the spherical joint 25. The fixing columns 5 connected between the support columns 4 greatly improve the overall rigidity of the support component, are beneficial to reducing the natural frequency of the vibration exciter working frame, and are convenient for the vibration exciter 1 to excite each measuring point on the structural member to be measured. The flat plate 8 is connected with the support column 4 through the spherical joint 25, so that the angle between the flat plate 8 and the support column 4 is changed conveniently, the support structure of the support component 3 for the structural component with large curvature change is optimized, and the excitation direction of the vibration exciter 1 is more in line with the actual requirement.
The support members may be selected from a suitable number of support columns 4 as required by the actual test. The number of support columns 4 is preferably 3-5. As shown in fig. 4, 4 support columns 4 are selected as the bottom support structure of the bracket component. And 1 fixing column 5 is connected between every two adjacent support columns 4 for further improving the overall rigidity of the support component.
As shown in fig. 1, the fixing column 5 is connected to the support column 4 by a pipe clamp 6. So set up, the pipe clamp 6 is convenient for the fixed column 5 quick assembly between many support columns 4. When promoting support part rigidity, to the structure of different structure, through utilizing pipe clamp 6 to add support column 4 at the different positions of support column 4, promoted the support part in the diversity of bearing structure morphology.
For example, the pipe clamp 6 shown in fig. 7 includes a first clamping portion and a second clamping portion. The side wall of the first clamping part is connected with the side wall of the second clamping part. The first clamping part is provided with a first clamping hole. The second clamping part is provided with a second clamping hole. The axis of the first clamping hole is perpendicular to the axis of the second clamping hole. The first clamping part and the second clamping part clamp the clamped component by means of locking fasteners.
As shown in fig. 4 in combination with fig. 5, the support column 4 includes a first round tube 21, a second round tube 22, and a third round tube 23. The first round tube 21 is sleeved in the second round tube 22. The second round tube 22 is sleeved in the third round tube 23. The head end of the first round tube 21 is connected with the flat plate 8. The tail end of the third round tube 23 is connected with the caster 7 through a connecting seat. Limiting holes 11 are formed in the side walls of the first circular tube 21, the second circular tube 22 and the third circular tube 23. A limiting column is arranged in the limiting hole 11. So set up, first pipe 21, second pipe 22 and third pipe 23 and spacing post that all have spacing hole 11 constitute the extending structure of support column 4. The length of the support column 4 can be adjusted by inserting the limit posts into different limit holes 11 and matching different limit holes 11 between the round tubes, and then the height of the adjusting seat part 3 can be adjusted, so that the positioning of the contact point of the vibration exciter 1 in the height direction is completed.
Wherein, the spacing post optional screw 9. The first round tube 21, the second round tube 22 and the third round tube 23 are nested end to end in sequence. The screw 9 passes through a limit hole 11 at the nesting joint and is fixed by a nut 10. As shown in fig. 6, the head end of the first round tube 21 is provided with a spherical joint 25.
As shown in fig. 8, the caster 7 is a self-locking caster 24. The device is arranged in such a way that the vibration exciter working frame is convenient to move and adjust the position on the horizontal plane, and then the locking is formed, so that the stability of the bracket component is further improved.
As shown in fig. 2, the drive means may alternatively be a motor 15. The motor 15 is connected with the limit support 17 through a fixed seat. The power end of the motor 15 is connected with the limit gear. The base 14 is provided with a button 19 for controlling the motor 15. By means of the arrangement, the workbench 12 is driven by the motor 15 to conveniently adjust the overturning angle of the workbench 12 along the arc-shaped slideway 26, the excitation direction of the vibration exciter 1 can be adjusted rapidly, and the clamping and positioning difficulty of the vibration exciter 1 in the vibration mode analysis process is further reduced.
As shown in fig. 3, the driving means may also be selected as a manual rocker 13. The power end of the manual rocker 13 is connected with the limit gear. Of course, the motor 15 and the manual rocker 13 can simultaneously serve as a drive for the table 12. So set up, when motor 15 drive workstation 12 upset, also can realize the fine setting to workstation 12 flip angle through the mode of rotating manual rocker 13, further improved vibration exciter 1 mounted position's position precision, and then promoted the validity of test result.
The arcuate slide 26 may alternatively be a circular arc slide. The arc-shaped positioning rack 18 can be selected to be an arc-shaped positioning rack. After the height and the position of the workbench 12 are determined, the arc-shaped slideway 26 can limit the workbench 12 to rotate along the arc track, so that the vibration exciter 1 generates exciting force in a hemispherical surface, and the stability and the persistence of the exciting force applied by the vibration exciter 1 to a structural member with large curvature change are further ensured.
When the working frame of the vibration exciter capable of realizing hemispherical excitation is used, firstly, a proper number of support columns 4 are selected according to test requirements, support components of corresponding support structures are assembled, and a self-contained tray 2 of the vibration exciter 1 is connected with a working table 12. When the workbench 12 reaches a specified position, the contact point of the vibration exciter 1 is adjusted to be abutted against the structural member. When the excitation point position changes, the height of the workbench 12 is adjusted through the telescopic structure of the support column 4, the workbench is fixed again at the position where the height is needed, the vertical height of the vibration exciter 1 is changed, and the vibration excitation task is completed for the new excitation point. When the structural member is a curved surface, the relative angle between the vibration exciter 1 and the horizontal plane needs to be adjusted, the manual rocker 13 is rotated according to the scale plate 20 on the base 14, the overturning angle of the workbench 12 is accurately adjusted, and after the required position is reached, the workbench 12 is locked, so that the excitation direction of the vibration exciter 1 is relatively vertical to the surface of the structural member, and an effective excitation force is generated.
Taking the installation of JZK-20 type vibration exciter as an example, according to the design requirement, the reference size of the working frame of the vibration exciter capable of realizing hemispherical excitation is as follows: each longitudinal support column consists of 3 sections of hollow round tubes with the length of 500mm and the tube thickness of 6mm, the outer diameters of the hollow round tubes are 40mm, 46mm and 52mm from top to bottom in sequence, and the two ends of the hollow round tubes are flat. And 3 screw holes with the diameter of 8mm are arranged at the joint of the round pipes, and each screw hole is separated by 80mm. The fixed column is a hollow round tube with the outer diameter of 42mm and the inner diameter of 36 mm. The pipe clamp is a standard steel pipe clamp. The maximum vertical height of the bracket is 1400mm. The angle adjustment range of the workbench of the vibration exciter base is as follows: 40 o-140o. The materials of the working frame are selected as steel materials, and the specific properties are as follows: young's modulus E=2.10 GPa, poisson's ratio μ=0.3, density ρ=7800 Kg/m3, and overall mass of the work frame is 25Kg-35Kg.
The present invention is not limited to the specific technical solutions described in the above embodiments, and other embodiments may be provided in addition to the above embodiments. Any modifications, equivalent substitutions, improvements, etc. made by those skilled in the art, which are within the spirit and principles of the present invention, are intended to be included within the scope of the present invention.
Claims (8)
1. The working frame of the vibration exciter capable of realizing hemispherical excitation is characterized by comprising an adjusting seat component and a bracket component;
The adjusting seat part comprises a driving device, a base and a workbench for connecting a tray of the vibration exciter, wherein the base is connected with the bracket part, an arc slideway for sliding the workbench is arranged on the base, a pair of arc slideways are symmetrically distributed along the central line of the base, an arc positioning rack is arranged between the pair of arc slideways, a limiting support is arranged at the bottom of the workbench, a limiting gear is arranged on the limiting support, the limiting gear is meshed with the arc positioning rack, and the power end of the driving device is connected with the limiting gear;
The support component comprises a flat plate and a support column, wherein the flat plate is arranged at the head end of the support column, the base is connected with the support column through the flat plate, the support column is provided with a telescopic structure for adjusting the height of the flat plate, and the tail end of the support column is provided with casters;
the support component is provided with a plurality of support columns, fixing columns are arranged between the support columns, the head ends of the support columns are provided with spherical joints, and the bottom of the flat plate is provided with spherical notches matched with the spherical joints;
the power end of the driving device drives the workbench to overturn along the arc-shaped slideway, the bracket component is on the same height in the process of carrying out vibration mode analysis on the structural component, the vibration exciter can generate exciting force on the hemispherical surface, and the rotating axis of the tray is mutually perpendicular to the overturning axis of the workbench, so that the vibration exciter can realize excitation within the hemispherical range.
2. The exciter work rack of claim 1, wherein the fixed column is connected to the support column by a pipe clamp.
3. The vibration exciter working frame capable of realizing hemispherical excitation according to claim 1, wherein the supporting column comprises a first circular tube, a second circular tube and a third circular tube, the first circular tube is sleeved in the second circular tube, the second circular tube is sleeved in the third circular tube, the head end of the first circular tube is connected with the flat plate, the tail end of the third circular tube is connected with the trundle through a connecting seat, limit holes are formed in the side walls of the first circular tube, the second circular tube and the third circular tube, and limit columns are arranged in the limit holes.
4. The vibration exciter working frame capable of realizing hemispherical excitation according to claim 1, wherein the driving device is a motor, the motor is connected with the limiting support through a fixed seat, the power end of the motor is connected with the limiting gear, and a button for controlling the motor is arranged on the base.
5. The vibration exciter work frame capable of realizing hemispherical excitation according to claim 1, wherein the driving device is a manual rocker, and a power end of the manual rocker is connected with a limiting gear.
6. The vibration exciter work frame capable of realizing hemispherical excitation according to claim 1, wherein a scale plate is arranged on the base, scale lines for marking the rotation angle of the work table along the arc-shaped slideway are arranged on the scale plate, and the scale lines are distributed on the scale plate at equal intervals.
7. The exciter work rack capable of achieving hemispherical excitation according to claim 1, wherein the casters are self-locking universal wheels.
8. The vibration exciter work frame capable of realizing hemispherical excitation according to claim 1, wherein the arc-shaped slide is a circular arc-shaped slide, and the arc-shaped positioning rack is a circular arc-shaped positioning rack.
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