CN215727430U - High-frequency dynamic and static stiffness composite loading test system - Google Patents
High-frequency dynamic and static stiffness composite loading test system Download PDFInfo
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- CN215727430U CN215727430U CN202122325339.7U CN202122325339U CN215727430U CN 215727430 U CN215727430 U CN 215727430U CN 202122325339 U CN202122325339 U CN 202122325339U CN 215727430 U CN215727430 U CN 215727430U
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Abstract
The utility model discloses a high-frequency dynamic and static stiffness composite loading test system. The high-frequency dynamic and static stiffness composite loading test system comprises: the vibration table is used for applying vibration load to the tested piece along the first direction; the first static loading unit is used for adjusting the distance between the tested piece and the table top of the moving coil of the vibration table in the first direction and applying a first static load to the tested piece along the second direction; the second static loading unit is used for applying a second static load to the tested piece along the third direction; the control unit is connected with the vibration table, the first static loading unit and the second static loading unit; the first direction is parallel to the second direction, and the third direction is perpendicular to the first direction or the third direction. The utility model realizes the closed-loop control of the static preload force applied on the to-be-tested piece through the pressure of the air spring on the bearing table and the bearing spring of the vibration table body, and can ensure that the loading force is unchanged in the test process.
Description
Technical Field
The utility model relates to a test system, in particular to a high-frequency dynamic and static stiffness composite loading test system, and belongs to the technical field of test equipment.
Background
Stiffness includes two implications: the ability to resist constant loads and the ability to resist alternating loads. The former is often referred to as static stiffness and the latter is referred to as dynamic stiffness. In the past, the static rigidity of a lathe is measured by simulating the stress condition during cutting under a non-cutting state, applying static load to the lathe, measuring the deformation of each part under different loads, making a corresponding rigidity characteristic curve and calculating the static rigidity of the lathe. At present, the static rigidity of the machine tool is measured by a one-way loading measurement method and a three-way loading measurement method. The former is a traditional measuring method, has the defect that the condition that three-way cutting component force is borne during machine tool machining is not met, and can only be used for comparing the rigidity of machine tool parts generally; the latter adopts the three-way loading measurement method to be closer to the real situation during cutting, but the values of the magnitude of the applied load and the displacement during measurement are displayed by a dial indicator, and the measurement method of manually processing data and drawing the static stiffness characteristic curve of the machine tool has the defects of low measurement efficiency, large error and the like;
the dynamic stiffness is the main index for measuring the vibration resistance of the machine tool and is numerically equal to the alternating force required for generating unit amplitude. Therefore, the response displacement can be simultaneously measured by applying exciting force to the machine tool, and the transfer function of the response displacement is the displacement of unit force, namely the dynamic flexibility. The dynamic stiffness is actually the reciprocal of the dynamic stiffness, and also reflects the capability of the machine tool for resisting external interference, and the larger the dynamic flexibility is, namely the larger the displacement generated by the system under the action of unit force is, the smaller the dynamic stiffness is. The dynamic stiffness test method is simple and slow in research progress, dynamic stiffness is usually tested and analyzed through contact loading, and due to the fact that the rotating speed of the high-speed electric spindle is high, a large amount of friction heat and abrasion are generated by the contact loading, and test accuracy is seriously affected.
SUMMERY OF THE UTILITY MODEL
Aiming at the defects of the prior art, the utility model aims to provide a high-frequency dynamic and static stiffness composite loading test system.
In order to achieve the purpose of the utility model, the technical scheme adopted by the utility model comprises the following steps:
the embodiment of the utility model provides a high-frequency dynamic and static stiffness composite loading test system, which comprises:
the vibration table is at least used for applying vibration load to a tested piece suspended above the moving coil table surface of the vibration table along a first direction;
the first static loading unit can be connected with the tested piece and at least used for adjusting the distance between the tested piece and the table surface of the moving coil of the vibration table in the first direction and applying a first static load to the tested piece in the second direction;
the second static loading unit can be connected with the tested piece and at least used for applying a second static load to the tested piece along a third direction;
the control unit is connected with the vibration table, the first static loading unit and the second static loading unit;
the first direction is parallel to the second direction, and the third direction is perpendicular to the first direction or the third direction.
Compared with the prior art, the high-frequency dynamic and static stiffness composite loading test system provided by the embodiment of the utility model has the advantages of simple structure and convenience in use and maintenance; the high-frequency dynamic and static stiffness composite loading test system realizes closed-loop control of static preload force applied to a to-be-tested piece through the four air springs on the bearing table and the pressure of the bearing spring of the vibration table body, and can ensure that the loading force is unchanged in the test process; in addition, the second driving shaft of the second driving mechanism of the high-frequency dynamic and static stiffness combined loading test system provided by the embodiment of the utility model is connected with the to-be-tested part through the hinge piece, so that additional Y-direction load cannot be generated due to product vibration, and the test result is closer to the actual working condition.
Drawings
In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings needed to be used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments described in the present application, and other drawings can be obtained by those skilled in the art without creative efforts.
Fig. 1 is a schematic structural diagram of a high-frequency dynamic and static stiffness composite loading test system provided in an exemplary embodiment of the present invention;
FIG. 2 is a schematic structural diagram of a high-frequency dynamic and static stiffness composite loading test system according to an exemplary embodiment of the present invention;
FIG. 3 is a schematic structural diagram illustrating a control principle of a high-frequency dynamic and static stiffness composite loading test system according to an exemplary embodiment of the present invention;
fig. 4 is a schematic structural diagram of a control principle of a high-frequency dynamic and static stiffness composite loading test system according to an exemplary embodiment of the present invention.
Detailed Description
In view of the deficiencies in the prior art, the inventors of the present invention have made extensive studies and extensive practices to provide technical solutions of the present invention. The technical solution, its implementation and principles, etc. will be further explained as follows.
The embodiment of the utility model provides a high-frequency dynamic and static stiffness composite loading test system, which comprises:
the vibration table is at least used for applying vibration load to a tested piece suspended above the moving coil table surface of the vibration table along a first direction;
the first static loading unit can be connected with the tested piece and at least used for adjusting the distance between the tested piece and the table surface of the moving coil of the vibration table in the first direction and applying a first static load to the tested piece in the second direction;
the second static loading unit can be connected with the tested piece and at least used for applying a second static load to the tested piece along a third direction;
the control unit is connected with the vibration table, the first static loading unit and the second static loading unit;
the first direction is parallel to the second direction, and the third direction is perpendicular to the first direction or the third direction.
Furthermore, the first static loading unit comprises a first driving mechanism, the first driving mechanism is fixedly arranged on a support of the vibration table, and a first transmission shaft of the first driving mechanism is fixedly connected with a to-be-tested piece.
Further, the first transmission shaft is further connected with a first pressure sensor, the first pressure sensor is used for monitoring the magnitude of a first static load exerted on the to-be-tested part by the first driving mechanism, and the first pressure sensor is further connected with the control unit.
Furthermore, the to-be-tested part is fixedly arranged on an elastic supporting mechanism, the elastic supporting mechanism is fixedly arranged on a bearing platform, and the bearing platform is arranged above the moving coil table surface of the vibration table.
Further, the elastic support mechanism includes a plurality of springs disposed in a first direction.
Furthermore, the second static force loading unit comprises a second driving mechanism, the second driving mechanism is fixedly arranged on a support of the vibration table, and a second transmission shaft of the second driving mechanism is hinged to the to-be-tested part.
Further, the second transmission shaft is connected with the to-be-tested piece through a hinge.
Further, the second transmission shaft is also connected with a second pressure sensor, the second pressure sensor is at least used for monitoring the magnitude of a second static load exerted on the piece to be tested by the second driving mechanism, and the second pressure sensor is also connected with the control unit.
Further, the first driving mechanism and the second driving mechanism are both linear driving mechanisms.
Further, the first driving mechanism and the second driving mechanism are linear air cylinders, and the first driving shaft and the second driving shaft are piston rods.
Furthermore, the table surface of the moving coil of the vibration table, the piece to be tested and the first driving shaft are coaxially arranged.
The technical solution, the implementation process and the principle thereof will be further explained with reference to the drawings, and the components such as the vibration table, the linear cylinder and the like in the present novel embodiment are all known to those skilled in the art unless otherwise specified.
Referring to fig. 1 and fig. 2, a high-frequency dynamic and static stiffness composite loading test system mainly includes: the electric vibration table 100, the first static loading assembly 200, the second static loading assembly 300 and the control assembly 700 are connected, wherein the control assembly is connected with the electric vibration table 100, the first static loading assembly 200 and the second static loading assembly 300 are fixedly arranged on a bracket of the electric vibration table 100, the electric vibration table 100 is used for applying a vibration load to a tested piece 400 suspended above a moving coil table surface of the vibration table along a first direction, and the first static loading assembly 200 and the second static loading assembly 300 are respectively connected with the tested piece 400 and are at least used for applying a static load to the tested piece 400 along a second direction and a third direction respectively.
Specifically, the first direction is parallel to a second direction, and the third direction is perpendicular to the first direction or a third direction, for example, the second direction is perpendicular to the top surface of the moving coil of the vibration table, the second direction may be a Z-axis direction, and the third direction is parallel to the top surface of the moving coil of the vibration table, or the third direction may be a Y-axis direction.
Specifically, the first static loading assembly 200 includes a first driving mechanism 210, the first driving mechanism 210 is fixedly disposed on a bracket of the electric vibration table 100, a first transmission shaft 211 of the first driving mechanism 210 is fixedly connected to the to-be-tested object 400 along the second direction, and the first transmission shaft 211 is further connected to a first pressure sensor 220, the first pressure sensor 220 is configured to monitor a magnitude of a first static load applied to the to-be-tested object 400 by the first driving mechanism 210, and the first pressure sensor 220 is further connected to the control assembly.
Specifically, the first driving mechanism 210 may drive the to-be-tested piece to move along the second direction in addition to applying the first static load to the to-be-tested piece, so as to adjust the distance between the to-be-tested piece 400 and the movable coil table of the electric vibration table.
Specifically, the second static force loading assembly 300 includes a second driving mechanism 310, the second driving mechanism 310 is fixedly disposed on a bracket of the electric vibration table 100, a second transmission shaft 311 of the second driving mechanism 310 is hinged to the to-be-tested piece 400, the second transmission shaft 311 is further connected to a second pressure sensor 320, the second pressure sensor 320 is at least used for monitoring a magnitude of a second static force load applied to the to-be-tested piece 400 by the second driving mechanism 310, and the second pressure sensor 320 is further connected to the control assembly.
Specifically, the first transmission shaft 211 is disposed along the z-axis direction and perpendicular to the moving coil table surface of the electric vibration table, and the second transmission shaft 311 is disposed along the Y-axis direction.
Specifically, the second transmission shaft 311 is connected to the test object 400 via a hinge 330, which may be a component known to those skilled in the art and is not limited thereto.
Specifically, the to-be-tested device 400 is fixedly disposed on the elastic supporting mechanism 500, the elastic supporting mechanism 500 is fixedly disposed on the bearing platform 600, the bearing platform 600 is disposed above the moving coil table of the electric vibration table 100, wherein the elastic supporting mechanism 500 may be a plurality of springs disposed along the first direction.
Specifically, the first driving mechanism 210 and the second driving mechanism 210 are both linear driving mechanisms, for example, the first driving mechanism 210 and the second driving mechanism 310 may be linear cylinders, and of course, the first driving mechanism 210 and the second driving mechanism 310 may be linear cylinders or linear driving motors, and the like, and in the embodiment of the present invention, the first driving mechanism 210 and the second driving mechanism 310 are preferably linear cylinders, and the first driving shaft 211 and the second driving shaft 311 are preferably piston rods.
Specifically, the moving coil of the electric vibration table is fixedly arranged on the supporting spring, and the supporting spring is coaxially arranged with the table surface of the moving coil of the vibration table, the to-be-tested part 400 and the first driving shaft 211.
Specifically, referring to fig. 3 and 4, the control assembly 700 is a servo electric cylinder static loading control system including a touch screen 710, a PLC controller 720, a servo driver 730 and a pressure signal transmitter 740, wherein the PLC controller 720 is respectively connected to the touch screen 710, the servo driver 730 and the pressure signal transmitter 740, the servo driver 730 is correspondingly connected to the first driving mechanism 210 and the second driving mechanism 310, and the pressure signal transmitter 740 is correspondingly connected to the first pressure sensor 220 and the second pressure sensor 320.
Specifically, the control assembly 700 may be an integrated one, or may be two interconnected control assemblies, the two control assemblies may be correspondingly connected to the first static loading assembly 200 and the second static loading assembly 300, respectively, and the control assembly 700 is further connected to the power supply 800.
Specifically, the working process and principle of the high-frequency dynamic and static stiffness composite loading test system in the embodiment of the utility model are at least as follows: the first static loading assembly 200 and the second static loading assembly 300 are static acting force executing parts of the system, and the first static loading assembly 200 and the second static loading assembly 300 are fixedly arranged on a bracket of the vibration table; taking the first static loading assembly 200 as an example, the first driving mechanism 210 is installed on the support of the vibration table through two flanges, the distance between the to-be-tested piece and the movable coil table surface of the vibration table can be adjusted according to the height of the to-be-tested piece, and the guiding in the vertical direction (i.e. the second direction or the Z-axis direction) is realized, the first driving shaft of the first driving mechanism is supported on the bearing platform through four air springs after passing through the first pressure sensor, the first static loading assembly 200 realizes the closed-loop control of the static preload force applied on the to-be-tested piece through the four air springs on the bearing platform and the pressure of the bearing spring of the vibration table body, and can ensure that the loading force is not changed in the test process; the second static loading assembly 300 is fixedly arranged on the side wall of the bracket of the vibration table, and the structure and the fixing mode of the second static loading assembly 300 are the same as those of the first static loading assembly 200; the second driving shaft of the second driving mechanism is connected with the to-be-tested part through the hinge piece, and additional Y-direction load cannot be generated due to vibration of a product.
The high-frequency dynamic and static stiffness composite loading test system provided by the embodiment of the utility model has the advantages of simple structure and convenience in use and maintenance; the high-frequency dynamic and static stiffness composite loading test system realizes closed-loop control of static preload force applied to a to-be-tested piece through the four air springs on the bearing table and the pressure of the bearing spring of the vibration table body, and can ensure that the loading force is unchanged in the test process; in addition, the second driving shaft of the second driving mechanism of the high-frequency dynamic and static stiffness combined loading test system provided by the embodiment of the utility model is connected with the to-be-tested part through the hinge piece, so that additional Y-direction load cannot be generated due to product vibration, and the test result is closer to the actual working condition.
It should be understood that the above-mentioned embodiments are merely illustrative of the technical concepts and features of the present invention, which are intended to enable those skilled in the art to understand the contents of the present invention and implement the present invention, and therefore, the protection scope of the present invention is not limited thereby. All equivalent changes and modifications made according to the spirit of the present invention should be covered within the protection scope of the present invention.
Claims (10)
1. The utility model provides a high frequency sound rigidity composite loading test system which characterized in that includes:
the vibration table is at least used for applying vibration load to a tested piece suspended above the moving coil table surface of the vibration table along a first direction;
the first static loading unit can be connected with the tested piece and at least used for adjusting the distance between the tested piece and the table surface of the moving coil of the vibration table in the first direction and applying a first static load to the tested piece in the second direction;
the second static loading unit can be connected with the tested piece and at least used for applying a second static load to the tested piece along a third direction;
the control unit is connected with the vibration table, the first static loading unit and the second static loading unit;
the first direction is parallel to the second direction, and the third direction is perpendicular to the first direction or the third direction.
2. The high-frequency dynamic and static stiffness composite loading test system according to claim 1, characterized in that: the first static force loading unit comprises a first driving mechanism, the first driving mechanism is fixedly arranged on a support of the vibration table, and a first transmission shaft of the first driving mechanism is fixedly connected with a to-be-tested part.
3. The high-frequency dynamic and static stiffness composite loading test system according to claim 2, characterized in that: the first transmission shaft is further connected with a first pressure sensor, the first pressure sensor is used for monitoring the magnitude of a first static load exerted on the to-be-tested piece by the first driving mechanism, and the first pressure sensor is further connected with the control unit.
4. The high-frequency dynamic and static stiffness composite loading test system according to claim 2, characterized in that: the test piece is fixedly arranged on the elastic supporting mechanism, the elastic supporting mechanism is fixedly arranged on the bearing platform, and the bearing platform is arranged above the table top of the moving coil of the vibration table.
5. The high-frequency dynamic and static stiffness composite loading test system according to claim 4, characterized in that: the elastic support mechanism includes a plurality of springs arranged in a first direction.
6. The high-frequency dynamic and static stiffness composite loading test system according to claim 2, characterized in that: the second static force loading unit comprises a second driving mechanism, the second driving mechanism is fixedly arranged on a support of the vibration table, and a second transmission shaft of the second driving mechanism is hinged with a to-be-tested part.
7. The high-frequency dynamic and static stiffness composite loading test system according to claim 6, characterized in that: the second transmission shaft is connected with a to-be-tested piece through a hinge.
8. The high-frequency dynamic and static stiffness composite loading test system according to claim 6, characterized in that: the second transmission shaft is further connected with a second pressure sensor, the second pressure sensor is at least used for monitoring the size of a second static load exerted on the piece to be tested by the second driving mechanism, and the second pressure sensor is further connected with the control unit.
9. The high-frequency dynamic and static stiffness composite loading test system according to claim 6, characterized in that: the first driving mechanism and the second driving mechanism are both linear driving mechanisms;
and/or the first driving mechanism and the second driving mechanism are linear air cylinders, and the first driving shaft and the second driving shaft are piston rods.
10. The high-frequency dynamic and static stiffness composite loading test system according to claim 2, characterized in that: the table top of the moving coil of the vibration table, the piece to be tested and the first driving shaft are coaxially arranged.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN202122325339.7U CN215727430U (en) | 2021-09-24 | 2021-09-24 | High-frequency dynamic and static stiffness composite loading test system |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202122325339.7U CN215727430U (en) | 2021-09-24 | 2021-09-24 | High-frequency dynamic and static stiffness composite loading test system |
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| CN215727430U true CN215727430U (en) | 2022-02-01 |
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- 2021-09-24 CN CN202122325339.7U patent/CN215727430U/en active Active
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