阅读说明：本技术 一种可实现半球激励的激振器工作架 (Vibration exciter working frame capable of realizing hemispherical excitation ) 是由 陈海龙 张航 庞福振 李海超 王雪仁 汤旸 戴慧玲 李玉慧 于 2021-08-11 设计创作，主要内容包括：本发明涉及激振器的安装设备技术领域,具体涉及一种可实现半球激励的激振器工作架。该工作架中调整座部件的基座与支架部件相连。基座上设置有供工作台滑动的弧形滑道。一对弧形滑道之间设置有弧形定位齿条。工作台的底部设置有带有限位齿轮的限位支座。限位齿轮与弧形定位齿条相啮合。驱动装置的动力端与限位齿轮相联接。支架部件包括平板和支撑柱。平板被置于支撑柱的首端。基座通过平板与支撑柱相连。支撑柱具有调节平板高度的伸缩结构。支撑柱的尾端设置有脚轮。该工作架在针对曲率变化大的结构件实施振动模态分析的过程中,优化了激振器的安装调整结构,提高了激振器可激励的范围,保证了激振器施加激振力的稳定性和持续性。(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 adjustment seat part in the work frame is connected with the bracket part. An arc-shaped slideway for the sliding of the workbench is arranged on the base. An arc positioning rack is arranged between the pair of arc slideways. The bottom of the workbench is provided with a limiting support with a limiting 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 supporting column. The plate is positioned at the head end of the support column. The base is connected with the supporting column through the flat plate. The support column is provided with a telescopic structure for adjusting the height of the flat plate. The tail end of the supporting column is provided with a caster. The working frame optimizes the installation and adjustment structure of the vibration exciter in the process of carrying out vibration mode analysis on a structural member with large curvature change, improves the excitable range of the vibration exciter, and ensures the stability and the continuity of the vibration exciter for applying exciting force.)

1. A vibration exciter working frame capable of realizing hemispherical excitation is characterized by comprising an adjusting seat part and a bracket part;

the adjusting seat component comprises a driving device, a base and a workbench connected with a tray of a vibration exciter, the base is connected with the support component, an arc-shaped slideway for the workbench to slide is arranged on the base, a pair of arc-shaped slideways are symmetrically distributed along the central line of the base, an arc-shaped positioning rack is arranged between the pair of arc-shaped 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-shaped 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, 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 a caster wheel.

2. The vibration exciter working frame capable of realizing hemispherical excitation according to claim 1, wherein the support member is provided with a plurality of support columns, a fixing column is 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.

3. The vibration exciter working stand capable of realizing hemispherical excitation according to claim 2, wherein the fixing column is connected with the supporting column through a pipe clamp.

4. The vibration exciter working frame capable of realizing hemisphere excitation according to claim 1, characterized in that the supporting column includes 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 caster through the connecting seat, the side walls of the first circular tube, the second circular tube and the third circular tube are provided with limiting holes, and the limiting holes are provided with limiting columns.

5. The exciter working stand capable of realizing hemispherical excitation according to claim 1, wherein the driving device is a motor, the motor is connected with a limiting support through a fixed seat, a power end of the motor is connected with a limiting gear, and a button for controlling the motor is arranged on the base.

6. The exciter working 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 limit gear.

7. The vibration exciter working 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 working platform along the arc-shaped slide way are arranged on the scale plate, and the scale lines are arranged on the scale plate at equal intervals.

8. The exciter working stand capable of realizing hemispherical excitation according to claim 1, wherein the caster wheel is a self-locking universal wheel.

9. The vibration exciter working frame capable of realizing hemispherical excitation according to claim 1, wherein the arc-shaped slide way is an arc-shaped slide way, and the arc-shaped positioning rack is an arc-shaped positioning rack.

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 exciter is a device attached to mechanical equipment for generating exciting force, and can make the exciting element obtain a certain form and magnitude of vibration, so that it can be used for vibration and strength test of object. At present, when analyzing and testing vibration modes and the like of a mechanical structure, a testing method of performing single-point excitation and multi-point response by using a vibration exciter is generally adopted, each measuring point is excited by the vibration exciter, and the vibration modes and the like of the structure are analyzed according to the response of each measuring point of a structural member.

The existing vibration exciter equipment is usually provided with a tray, a semicircular arc area can be excited randomly around a rotating shaft, the tray is fixed in vertical height and cannot move freely in a plane. Moving and fixing the actuators is cumbersome for testing of multiple point actuation at different heights. For structural parts with large curvature change, the requirement of the semi-circular arc excitation area of the existing exciter on the installation of the exciter is too high, and a lot of inconvenience is brought to operators. Therefore, the vibration exciter has a larger excitation range and can be stably installed in engineering tests, and the vibration exciter has important significance.

Through search, chinese patent document CN106185733B discloses a simple hoisting device for a six-degree-of-freedom vibration exciter. The hoisting device comprises a square frame consisting of four supporting trusses with built-in slideways and eight horizontal trusses. Four corners at the lower end of the square frame are respectively provided with a steering wheel. Two horizontal sectional materials with adjustable positions are arranged on the upper end surface of the square frame. Each horizontal section bar is provided with two first lifting eyes. Each lifting lug is hinged with a thread locking component. The end parts of the four thread locking components are respectively hinged with the four second lifting lugs, and the four second lifting lugs are arranged on the vibration exciter. The device utilizes the structural characteristics of the horizontally-installed truss to realize the hoisting of the vibration exciters with different magnitudes, can determine the rationalization of the installation position of the vibration exciters by adjusting the connection relation among all the components, and ensures that the vibration exciters work stably and safely in the air.

However, when the hoisting device performs vibration mode analysis on a structural member with a large curvature change, it is difficult to adjust the installation position of the vibration exciter so that the excitation direction of the vibration exciter is perpendicular to the contact surface with the structural member, thereby affecting the validity of the test result. In other words, the hoisting 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 excitation direction of the measuring point on the structural member.

In summary, in the process of performing vibration mode analysis on a structural member with a large curvature variation, how to design an installation and adjustment device for a vibration exciter, so that the vibration exciter excites excitation points at various heights of the structural member, and simultaneously, the vibration exciter can generate an excitation force on a hemispherical surface at the same height, thereby ensuring the stability and the continuity of the vibration exciter for applying the excitation force to the structural member with a large curvature variation, has become a technical problem to be solved urgently 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 part with large curvature change, so that the vibration exciter can excite excitation points on various heights of the structural part and can generate an exciting force on a hemispherical surface on the same height, and the stability and the continuity of the exciting force applied by the vibration exciter to the structural part with large curvature change are further ensured.

In order to achieve the purpose, the invention adopts the following scheme: the vibration exciter working frame capable of realizing hemispherical excitation comprises an adjusting seat part and a bracket part;

the adjusting seat component comprises a driving device, a base and a workbench connected with a tray of a vibration exciter, the base is connected with the support component, an arc-shaped slideway for the workbench to slide is arranged on the base, a pair of arc-shaped slideways are symmetrically distributed along the central line of the base, an arc-shaped positioning rack is arranged between the pair of arc-shaped 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-shaped 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, 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 a caster wheel.

As preferred, the support component has many support columns, is provided with the fixed column between the support column, and the head end of support column is provided with ball joint, and dull and stereotyped bottom is provided with the spherical notch with ball joint assorted. So set up, the fixed column of connection between many support columns has improved the whole rigidity of support parts greatly, be favorable to reducing the natural frequency of vibration exciter work frame, be convenient for the vibration exciter to encourage every measurement station on the structure that awaits measuring, be connected through ball joint between dull and stereotyped and the support column, be convenient for change the angle between dull and stereotyped and the support column, be favorable to having the great structure of camber change, optimize the bearing structure of support parts to adjustment seat part for the excitation direction of vibration exciter accords with actual demand more.

Preferably, the fixing post is connected with the supporting post through a pipe clamp. So set up, the fixed column rapid Assembly of being convenient for of pipe clamp is between many support columns, when promoting the support components rigidity, to the structure of different structures, adds the support column through utilizing the pipe clamp at the different positions of support column, has promoted the variety of support components on bearing structure form.

As preferred, the support column includes first pipe, second pipe and third pipe, and first pipe cup joints in the second pipe, and the second pipe cup joints in the third pipe, and the head end and the flat board of first pipe link to each other, and the tail end of third pipe passes through the connecting seat and links to each other with the truckle, all is provided with spacing hole on the lateral wall of first pipe, second pipe and third pipe, spacing downthehole spacing post that is provided with. So set up, first pipe, second pipe and third pipe and the spacing post that all have spacing hole have constituted the extending structure of support column, peg graft in the spacing hole of difference through spacing post to and the cooperation in the spacing hole of difference between the pipe, can realize the regulation to support column length, and then realize the regulation to the adjustment seat part height, thereby accomplish the location of the contact point of vibration exciter on the direction of height.

Preferably, the driving device is a motor, the motor is connected with the limiting support through the fixing seat, the power end of the motor is connected with the limiting gear, and the base is provided with a button for controlling the motor. So set up, the workstation of being convenient for accomplishes workstation rotation angle's adjustment along the arc slide under the drive of motor, is favorable to vibration exciter fast speed adjusting excitation direction, has further reduced the degree of difficulty of vibration exciter clamping location in 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 the upset of motor drive workstation, also can realize the fine setting to workstation roll-over angle through the mode of rotating manual rocker, further improved the position precision of vibration exciter mounted position, and then promoted the validity of test result.

As the preferred, be provided with the scale plate on the base, be provided with the scale mark of sign workstation along arc slide turned angle on the scale plate, the scale mark is arranged at the equidistance on the scale plate. So set up, on the one hand make the upset position of workstation more accurate, on the other hand is convenient for record workstation's upset position to this is the reference standard, can in time revise the deviation of upset position in the experimentation, has further promoted the validity of test result.

Preferably, the caster wheel is a self-locking universal wheel. So set up, form the locking after the vibration exciter working frame removes the position on the adjustment horizontal plane of being convenient for, further promoted support element's stability.

Preferably, the arc-shaped slide way is an arc-shaped slide way, and the arc-shaped positioning rack is an arc-shaped positioning rack. So set up, after workstation height position confirms, convex slide can restrict the workstation and follow circular arc orbit and rotate, realizes letting the vibration exciter produce exciting force in the hemisphere face, has further guaranteed that the vibration exciter exerts exciting force's stability and continuation to the structure that the camber changes greatly.

When the vibration exciter working frame capable of realizing hemispherical excitation is used, firstly, a proper number of support columns are selected according to test requirements, support parts of corresponding support structures are assembled, and a self-contained tray of the vibration exciter is connected with a working table. And after the workbench reaches the designated position, adjusting the contact point of the vibration exciter to abut against the structural part. When the position of an excitation point changes, the height of the workbench is adjusted through the telescopic structure of the support column, the workbench is fixed again at the required height, the vertical height of the vibration exciter is changed, and the vibration exciting task is completed on the new excitation point. When the structural part is a curved surface and the relative angle between the vibration exciter and the horizontal plane needs to be adjusted, the manual rocker is rotated according to the scale plate on the base, the turnover 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 vertical to the surface of the structural part, and effective excitation force is generated.

Compared with the prior art, the vibration exciter working frame capable of realizing hemispherical excitation provided by the invention has the following prominent substantive characteristics and remarkable progress:

1. the arc-shaped slideway is arranged on the base in the vibration exciter working frame capable of realizing hemispherical excitation, the power end of the driving device drives the working table to overturn along the arc-shaped slideway, the installation and adjustment structure of the vibration exciter is optimized in the process of carrying out vibration mode analysis on a structural part with large curvature change, the excitable range of the vibration exciter is improved, the bracket component is realized at the same height, the vibration exciter can generate exciting force on a hemispherical surface, and the stability and the continuity of the vibration exciter for applying the exciting force to the structural part 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, so that the height of the working table can be adjusted, the contact of the vibration exciter can obtain the offset of a corresponding angle by adjusting the turnover angle of the working table when the structural member is a curved surface with large curvature except that the height of the working table can be adjusted at different heights and different horizontal positions, and the contact is mutually vertical to the structural member, so that more stable and effective exciting force is provided, and the effectiveness of an engineering test result is ensured.

Drawings

Fig. 1 is a schematic perspective view of a vibration exciter working stand capable of realizing hemispherical excitation according to an embodiment of the invention;

FIG. 2 is a perspective view of the adjuster socket member;

FIG. 3 is a front view of FIG. 2;

FIG. 4 is a perspective view of the bracket assembly;

FIG. 5 is a schematic perspective view of the support;

FIG. 6 is a perspective view of a first tube;

figure 7 is a schematic perspective view of the pipe clamp;

fig. 8 is a perspective view of the self-locking universal wheel.

Reference numerals: the vibration exciter comprises a vibration exciter 1, a tray 2, an adjusting seat component 3, a supporting column 4, a fixing column 5, a pipe clamp 6, a caster 7, a flat plate 8, a screw 9, a nut 10, a limiting hole 11, a workbench 12, a manual rocker 13, a base 14, a motor 15, a threaded hole 16, a limiting support 17, an arc-shaped positioning rack 18, a button 19, a scale plate 20, a first circular pipe 21, a second circular pipe 22, a third circular pipe 23, a self-locking universal wheel 24, a spherical joint 25 and an arc-shaped slideway 26.

Detailed Description

The following detailed description of embodiments of the invention refers to the accompanying drawings.

An exciter working stand capable of realizing hemispherical excitation, as shown in fig. 1-8, is used for an installation adjusting device of an exciter in the process of carrying out vibration mode analysis on a structural member with large curvature change. The arc-shaped slide way is arranged on the base of the vibration exciter working frame on the adjusting seat part, the power end of the driving device drives the working table to overturn along the arc-shaped slide way, the mounting and adjusting structure of the vibration exciter is optimized, the excitable range of the vibration exciter is improved, the bracket part is at the same height, the vibration exciter can generate exciting force on a hemispherical surface, and the stability and the continuity of the exciting force applied to a structural part with large curvature change by the vibration exciter are ensured.

As shown in fig. 1, the exciter working frame capable of realizing hemispherical excitation comprises an adjusting seat part 3 and a bracket part. The stand member serves as a support structure for the adjustment seat member 3 for adjusting the position of the exciter 1 in the horizontal plane and the height of the exciter 1 relative to the ground. Therefore, the support part enables the contact point of the vibration exciter 1 to be in contact with the surface of the structural part to be tested, the initial positioning of the contact point is realized, and the installation and arrangement efficiency of the vibration exciter 1 is improved.

As shown in fig. 2, the adjustment seat member 3 comprises 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 frame member. The base 14 is provided with an arc-shaped slide 26 on which the table 12 slides. A pair of arcuate runners 26 are symmetrically disposed along the centerline of the base 14. An arc-shaped positioning rack 18 is arranged between the pair of arc-shaped slideways 26. The bottom of the working table 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 overturning axis of the workbench 12, so that the vibration exciter can realize excitation in a hemispherical range.

As shown in fig. 3, a scale plate 20 is provided on the base 14. The scale plate 20 is provided with scale marks for marking the rotation angle of the workbench 12 along the arc-shaped slide way 26. The scale lines are arranged at equal intervals on the scale plate 20. Due to the arrangement, on one hand, the overturning position of the workbench 12 is more accurate; on the other hand, the overturning position of the workbench 12 is convenient to record, so that the overturning position can be corrected in time in the test process by taking the overturning position as a reference datum, and the effectiveness of the test result is further improved.

As shown in fig. 1 in conjunction with fig. 4, the bracket member includes a flat plate 8 and a support column 4. The 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 supporting column 4 has a telescopic structure for adjusting the height of the flat plate 8. The tail end of the supporting column 4 is provided with a caster 7.

Wherein the holder part has a plurality of support columns 4. Fixed columns 5 are arranged between the supporting 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 notch matching the spherical joint 25. So set up, the fixed column 5 of connection between many support columns 4 has improved the whole rigidity of support parts greatly, is favorable to reducing the natural frequency of vibration exciter work frame, and the vibration exciter 1 of being convenient for is encouraged every measurement station on the structure that awaits measuring. The flat plate 8 is connected with the supporting column 4 through the spherical joint 25, so that the angle between the flat plate 8 and the supporting column 4 can be changed conveniently, the supporting structure of the support component for the adjusting seat component 3 is optimized for structural members with large curvature change, and the excitation direction of the vibration exciter 1 can meet actual requirements better.

According to the needs of actual test, the support column 4 of suitable quantity can be chooseed for use to the support part. The number of the supporting columns 4 is preferably 3 to 5. As shown in fig. 4, the support member uses 4 support columns 4 as the bottom support structure. All be connected with 1 fixed column 5 between adjacent support column 4 for further improve the whole rigidity of support components.

As shown in fig. 1, the fixing post 5 is connected to the support post 4 by a pipe clamp 6. So set up, pipe clamp 6 is convenient for fixed column 5 rapid Assembly between many support columns 4. When the rigidity of the support component is improved, the support column 4 is additionally arranged at different positions of the support column 4 by utilizing the pipe clamp 6 aiming at the structures of different structural components, so that the diversity of the support component on the shape of the support structure is improved.

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 in a fastening piece locking mode.

As shown in fig. 4 in conjunction with fig. 5, the support column 4 includes a first circular tube 21, a second circular tube 22, and a third circular tube 23. The first tube 21 is sleeved inside the second tube 22. The second round tube 22 is sleeved in the third round tube 23. The head end of the first tube 21 is connected to the plate 8. The tail end of the third round tube 23 is connected with the caster 7 through the connecting seat. The side walls of the first round pipe 21, the second round pipe 22 and the third round pipe 23 are all provided with limiting holes 11. A limiting column is arranged in the limiting hole 11. So set up, first pipe 21, second pipe 22 and third pipe 23 and the spacing post that all have spacing hole 11 have constituted the extending structure of support column 4. Through spacing post grafting in spacing hole 11 of difference to and the cooperation in different spacing hole 11 between the pipe, can realize the regulation to 4 lengths of support column, and then realize the regulation to 3 heights of adjustment seat part, thereby accomplish the location of vibration exciter 1's contact point in the direction of height.

Wherein, the limiting column can be a screw 9. The first round tube 21, the second round tube 22 and the third round tube 23 are sequentially nested end to end. The screw 9 passes through a limiting hole 11 at the nesting joint and is fixed through a nut 10. As shown in fig. 6, the head end of the first round tube 21 is provided with a ball joint 25.

As shown in fig. 8, the caster 7 is a self-locking caster 24. So set up, form the locking after the position on the vibration exciter working frame removal adjustment horizontal plane of being convenient for, further promoted support element's stability.

As shown in fig. 2, the driving means may be selected as 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 a limit gear. The base 14 is provided with a button 19 for controlling the motor 15. So set up, workstation 12 along arc slide 26 under the drive of motor 15 of being convenient for, accomplish the adjustment of workstation 12 rotation angle, be favorable to vibration exciter 1 quick adjustment excitation direction, further reduced vibration exciter 1 the degree of difficulty of clamping location in vibration mode analysis process.

As shown in fig. 3, the drive means may alternatively be a manual rocker 13. The power end of the manual rocker 13 is connected with a limit gear. Of course, the motor 15 and the manual rocker 13 may 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 the position accuracy of vibration exciter 1 mounted position, and then promoted the validity of test result.

The arcuate chute 26 may alternatively be a circular arc chute. The arc-shaped positioning rack 18 can be selected as a circular arc-shaped positioning rack. So set up, after workstation 12 height position confirms, circular arc slide 26 can restrict workstation 12 and rotate along the circular arc orbit, realizes letting vibration exciter 1 produce exciting force in the hemisphere face, has further guaranteed vibration exciter 1 to exert the stability and the continuation of exciting force to the structure that the camber changes greatly.

When the vibration exciter working frame capable of realizing hemispherical excitation provided by the embodiment of the invention is used, firstly, a proper number of support columns 4 are selected according to test requirements, bracket parts of corresponding support structures are assembled, and the self-contained tray 2 of the vibration exciter 1 is connected with a working table 12. After the working platform 12 reaches the designated position, the contact point of the vibration exciter 1 is adjusted to abut against the structural member. When the position of an excitation point 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 with the required height, the vertical height of the vibration exciter 1 is changed, and the vibration exciting task is completed for the new excitation point. When the structural member is a curved surface and 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 effective excitation force is generated.

Taking the installation of a JZK-20 model vibration exciter as an example, according to design requirements, the vibration exciter working frame capable of realizing hemispherical excitation has the following reference dimensions: each longitudinal support column is composed of 3 segments in length 5The hollow pipe with the thickness of 00mm and the thickness of 6mm consists of hollow round pipes, the outer diameters of which are 40mm, 46mm and 52mm from top to bottom in sequence, and the two ends of the hollow round pipes are flat. The joint of the circular tube is provided with 3 screw holes with the diameter of 8mm, and each screw hole is separated by 80 mm. The fixed column is a hollow circular 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 1400 mm. The angle adjustment range of the workbench of the vibration exciter base is as follows: 40^o-140^o. The material of the working frame is selected from steel, and the concrete properties are as follows: young modulus E is 2.10GPa, Poisson ratio mu is 0.3, density rho is 7800Kg/m3, and the whole weight of the working frame is 25Kg-35 Kg.

The present invention is not limited to the specific technical solutions described in the above embodiments, and other embodiments may be made in the present invention in addition to the above embodiments. It will be understood by those skilled in the art that various changes, substitutions of equivalents, and alterations can be made without departing from the spirit and scope of the invention.