CN114136651A - Vibration exciter lifting device for automobile body modal test - Google Patents
Vibration exciter lifting device for automobile body modal test Download PDFInfo
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- CN114136651A CN114136651A CN202010921459.0A CN202010921459A CN114136651A CN 114136651 A CN114136651 A CN 114136651A CN 202010921459 A CN202010921459 A CN 202010921459A CN 114136651 A CN114136651 A CN 114136651A
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- upper cover
- cover plate
- vibration exciter
- bottom plate
- automobile body
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
- G01M17/00—Testing of vehicles
- G01M17/007—Wheeled or endless-tracked vehicles
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- General Physics & Mathematics (AREA)
- Testing Of Devices, Machine Parts, Or Other Structures Thereof (AREA)
Abstract
The invention provides a vibration exciter lifting device for automobile body modal testing, which comprises an upper cover plate, a bottom plate, a supporting mechanism, a transmission mechanism and a control box, wherein a motor is arranged in the control box, the motor is in transmission connection with the supporting mechanism through the transmission mechanism, the supporting mechanism is supported between the upper cover plate and the bottom plate, and the supporting mechanism can enable the upper cover plate to move up and down relative to the bottom plate. The height of the vibration exciter is adjusted through the liftable upper cover plate, so that the excitation point can be accurately positioned, the vibration exciter is fully contacted with the excitation point, and the excitation is fully ensured.
Description
Technical Field
The invention relates to the technical field of NVH (noise vibration and harshness) test equipment, in particular to a vibration exciter lifting device for automobile body modal test.
Background
In order to optimize an automobile body modal Test method, obtain accurate automobile body modal parameters, develop contrast Test research, and study the selection principle of three elements of modal Test, namely, the selection mode of measuring point arrangement, boundary constraint and excitation form by combining LMS Test Lab and researching the comparison of a large amount of modal Test data. During the test, the vehicle body is lifted by the portal frame, the excitation point is a certain distance away from the ground, and the distance is not fixed and unchanged, so that a liftable test bed is needed to fix the vibration exciter, the excitation point can be accurately positioned, the vibration exciter is in contact with the excitation point sufficiently, and the excitation is ensured to be sufficient.
Disclosure of Invention
The technical problem to be solved by the invention is as follows: in order to overcome the defects in the prior art, the invention provides a vibration exciter lifting device for automobile body modal testing, which is used for solving the problem that the distance between the vibration exciter and an excitation point is not fixed. The excitation point can be accurately positioned, the vibration exciter is fully contacted with the excitation point, and the excitation is fully ensured.
The technical scheme adopted for solving the technical problems is as follows: the utility model provides a vibration exciter elevating gear of auto body modal test, includes upper cover plate, bottom plate, supporting mechanism, drive mechanism and control box, be equipped with the motor in the control box, the motor passes through drive mechanism and is connected with the drive of supporting mechanism, supporting mechanism supports between upper cover plate and bottom plate, and supporting mechanism can make the relative bottom plate of upper cover plate reciprocate. The height of the vibration exciter is adjusted through the liftable upper cover plate, so that the excitation point can be accurately positioned, the vibration exciter is fully contacted with the excitation point, and the excitation is fully ensured.
Furthermore, in order to realize the up-and-down movement of the upper cover plate, the supporting mechanism comprises at least two threaded rolling bearings, the threaded rolling bearings are supported between the upper cover plate and the bottom plate in a balanced manner, and the threaded rolling bearings can drive the upper cover plate to move up and down relative to the bottom plate. The support column adopts a threaded rolling bearing, so that the support column can play a role in supporting and can also realize the up-and-down movement of the upper cover plate.
Specifically, screw thread antifriction bearing includes bearing portion and pivot portion, pivot portion lower extreme and bearing inner race fixed connection, upper end upwards extend and the outer wall is equipped with the screw thread, bearing portion fixes on the bottom plate, the upper end and the upper cover plate threaded connection of pivot portion, and still be equipped with driven gear in the pivot portion between upper cover plate and the bottom plate, driven gear and the coaxial fixed connection of pivot portion.
Furthermore, in order to guarantee the stability of the upper cover plate when moving up and down, the guide mechanism comprises at least one guide assembly, the guide assembly comprises a guide upright post and a guide sleeve, the guide sleeve is fixed on the upper cover plate, the guide sleeve can be fixed on the upper end face of the upper cover plate and can also be fixed on the lower end face, the bottom of the guide upright post is fixed on the bottom plate, the upper end of the guide upright post extends upwards to penetrate through the guide sleeve and the upper cover plate and is in clearance fit with the guide sleeve, a lubricant is filled between the guide sleeve and the guide upright post, and the guide mechanism mainly limits the degree of freedom of the upper cover plate and plays a role in guiding the upper cover plate in the up-and-down movement process.
Further, in order to realize torque transmission, the transmission mechanism comprises a worm wheel, a worm wheel output shaft, a driving gear and a driven gear, the worm is supported on the bottom plate through worm supports at two ends, one end of the worm is in transmission connection with the motor, the bottom of the worm wheel output shaft is fixed on the bottom plate, the worm wheel is coaxially arranged on the worm wheel output shaft and is meshed with the worm, and the worm wheel and the worm are matched to convert rotation in a vertical plane into rotation in a horizontal plane; the upper end of the worm gear output shaft is also provided with driving gears, the positions and the number of the driving gears are matched with those of the supporting mechanism, the supporting mechanism is provided with driven gears, and the driving gears and the driven gears are matched to enable the upper cover plate to move up and down relative to the bottom plate.
Furthermore, in order to match the actual installation space, the transmission mechanism further comprises a first gear pair and a second gear pair, the input end of the first gear pair is connected with the rotating shaft of the motor, the output end of the first gear pair is in transmission connection with the input end of the second gear pair through the rotating shaft, and the output end of the second gear pair is connected to one end of the worm. The torque transmission from the motor to the worm gear is realized through the gear pair.
Further, in order to satisfy the torque transmission with large space and large distance, the outer diameter of the gear cannot be simply increased, therefore, in order to realize the transmission between the driving gear and the driven gear, the transmission device further comprises an idler wheel, the idler wheel is rotatably supported on the bottom plate through an idler wheel rotating shaft, and two sides of the idler wheel are respectively meshed with the driving gear and the driven gear. The number of idler wheels is the same as the number of threaded rolling bearings in the support mechanism, and each threaded rolling bearing needs to be matched with one idler wheel.
Furthermore, for the height of accurate control vibration exciter, still include displacement sensor, displacement sensor includes transmitting terminal and receiving terminal, transmitting terminal and receiving terminal set up respectively on upper cover plate and bottom plate, and transmitting terminal and receiving terminal just right from top to bottom, displacement sensor is connected with the control box for measure the displacement of the relative bottom plate of upper cover plate, and send measuring result to the control box.
The vibration exciter is arranged on the upper cover plate, a pressure sensor is arranged at the front end of the vibration exciter and used for measuring the pressure between the front end of the vibration exciter and an excitation point and feeding a pressure signal back to the controller, and therefore whether the front end of the vibration exciter is in full contact with the excitation point or not is judged.
Furthermore, the motor comprises two gears of high-speed rotation and low-speed rotation, so that the quick adjustment and fine adjustment of ascending displacement are facilitated.
The invention has the beneficial effects that: the vibration exciter for the automobile body modal test is simple and efficient in arrangement by using the vibration exciter; all transmission modes are gear transmission, so that compared with other transmission modes, the gear transmission mechanism has the advantages of accurate and stable transmission ratio, low noise, high transmission efficiency and reliability. The rotating speed of the motor can be visually seen from the change of the height of the cover plate, and finally, the change of the value is accurately represented on the displacement sensor. When the vibration exciter is far away from an excitation point, the motor rotates at a high speed; when the front end of the vibration exciter is close to an excitation point, the rotating speed is reduced, fine adjustment is carried out until a pressure value appears on a pressure sensor at the front end, and the rotation is stopped at the moment. And finishing the arrangement of the vibration exciters. The process is electrically controlled, is convenient and efficient, and solves the problems of insufficient and inaccurate point contact of manually controlled excitation points and unstable transmission ratio of chain transmission or belt transmission as a transmission mechanism.
Drawings
The invention is further illustrated by the following figures and examples.
Fig. 1 is a schematic perspective view of a preferred embodiment of the present invention.
Fig. 2 is a schematic view of the internal structure of the lifting device (with the upper cover removed).
In the figure: 1. the device comprises a threaded rolling bearing, 2, an upper cover plate, 3, a driven gear, 4, a worm, 5, a displacement sensor, 6, a bottom plate, 7, a worm wheel, 8, a control box, 9, a worm wheel output shaft, 10, an idler wheel, 11, a guide upright post, 12, a driving gear, 13, a guide sleeve, 14, an idler wheel rotating shaft, 15, a first gear pair, 16, a second gear pair, 17 and a worm support.
Detailed Description
The present invention will now be described in further detail with reference to the accompanying drawings. The drawings are simplified schematic diagrams illustrating the basic structure of the present invention only in a schematic manner, and thus show only the constitution related to the present invention, and directions and references (e.g., upper, lower, left, right, etc.) may be used only to help the description of the features in the drawings. The following detailed description is, therefore, not to be taken in a limiting sense, and the scope of the claimed subject matter is defined only by the appended claims and equivalents thereof.
As shown in fig. 1 and 2, the vibration exciter lifting device for the automobile body modal testing of the invention comprises an upper cover plate 2, a bottom plate 6, a supporting mechanism, a guiding mechanism, a transmission mechanism and a control box 8, wherein a motor is arranged in the control box 8, the motor is in transmission connection with the supporting mechanism through the transmission mechanism, the supporting mechanism is supported between the upper cover plate 2 and the bottom plate 6, and the supporting mechanism can enable the upper cover plate 2 to move up and down relative to the bottom plate 6. The bottom plate 6 is a rectangular iron plate and can be fixed on the floor by a clamp, and the upper cover plate 2 is also of a rectangular structure.
The supporting mechanism comprises at least two threaded rolling bearings 1, the threaded rolling bearings 1 are supported between the upper cover plate 2 and the bottom plate 6 in a balanced mode, and the threaded rolling bearings 1 can drive the upper cover plate 2 to move up and down relative to the bottom plate 6. The threaded rolling bearing 1 comprises a bearing portion and a rotating shaft portion, the lower end of the rotating shaft portion is fixedly connected with a bearing inner ring, the upper end of the rotating shaft portion extends upwards, threads are arranged on the outer wall of the rotating shaft portion, the bearing portion is fixed on the bottom plate 6, the upper end of the rotating shaft portion is in threaded connection with the upper cover plate 2, a driven gear 3 is further arranged on the rotating shaft portion between the upper cover plate 2 and the bottom plate 6, and the driven gear 3 is coaxially and fixedly connected with the rotating shaft portion.
The guide mechanism comprises at least one guide assembly, the guide assembly comprises a guide upright 11 and a guide sleeve 13, the guide sleeve 13 is fixed on the upper cover plate 2, can be fixed on the upper end surface of the upper cover plate 2, and can also be fixed on the lower end surface, preferably, and the space structure is reduced, in the embodiment, the guide sleeve 13 is fixed on the lower end surface of the upper cover plate 2 through a screw; the bottom of the guide upright post 11 is fixed on the bottom plate 6, the upper end of the guide upright post extends upwards to penetrate through the guide sleeve 13 and the upper cover plate 2, the guide sleeve 13 is in clearance fit with the upper end of the guide upright post, and lubricant is filled between the guide sleeve 13 and the guide upright post 11.
In the embodiment, the number of the threaded rolling bearings 1 is two, the number of the guide assemblies is also two, the two threaded rolling bearings 1 are arranged on one group of opposite angles, and the two guide assemblies are arranged on the other group of opposite angles and are distributed in a rectangular shape, so that the support and the guide are distributed in a balanced manner.
The transmission mechanism comprises a first gear pair 15, a second gear pair 16, a worm wheel 7, a worm 4, a worm wheel output shaft 9, a driving gear 12, a driven gear 3 and an idler wheel 10, the input end of the first gear pair 15 is connected with a rotating shaft of the motor, the output end of the first gear pair is in transmission connection with the input end of the second gear pair 16 through the rotating shaft, and the output end of the second gear pair 16 is connected with one end of the worm 4; the worm 4 is supported on the bottom plate 6 through worm supports 17 at two ends, one end of the worm is in transmission connection with the motor, the bottom of the worm wheel output shaft 9 is fixed on the bottom plate 6, the worm wheel 7 is coaxially arranged on the worm wheel output shaft 9 and is meshed with the worm 4, and the worm wheel 7 and the worm 4 are matched to convert the rotation in the vertical plane into the rotation in the horizontal plane; the driving gear 12, the driven gear 3 and the idler gear 10 are two and are respectively matched with the threaded rolling bearings 1 on the two sides; the driving gear 12 is coaxially fixed at the upper end of the worm wheel output shaft 9, the driven gear 3 is fixed on the rotating shaft part of the threaded rolling bearing 1, the idler 10 is rotatably supported on the bottom plate 6 between the driving gear 12 and the driven gear 3 through an idler rotating shaft 14, and two sides of the idler 10 are respectively meshed with the driving gear 12 and the driven gear 3. In the present embodiment, the first gear pair 15 and the second gear pair 16 are respectively composed of two gears having the same number of teeth.
Still be equipped with displacement sensor 5 on relative position from top to bottom of bottom plate 6 and upper cover plate 2, displacement sensor 5 includes transmitting terminal and receiving terminal, transmitting terminal and receiving terminal set up respectively on upper cover plate 2 and bottom plate 6, and transmitting terminal and receiving terminal are just right from top to bottom, displacement sensor 5 is connected with control box 8 for measure the displacement of the relative bottom plate 6 of upper cover plate 2, and send measuring result to control box 8.
The vibration exciter is arranged on the upper cover plate 2, a pressure sensor is arranged at the front end of the vibration exciter and used for measuring the pressure between the front end of the vibration exciter and an excitation point and feeding a pressure signal back to the controller, so that whether the front end of the vibration exciter is in full contact with the excitation point or not is judged.
The working process is as follows:
the motor drives the first gear pair 15 and the second gear pair 16 to rotate, then the first gear pair 15 and the second gear pair 16 drive the worm 4 to rotate, and the worm 4 is matched with the worm wheel 7 to convert the rotation in the vertical direction into the rotation in the horizontal plane. The worm wheel 7 rotates coaxially with the two drive gears 12. The two driving gears 12 drive the two diagonal threaded rolling bearings 1 to rotate through the intermediate idler gear 10, and finally the upper cover plate 2 moves upwards. The vibration exciter is placed on the upper cover plate 2 and is fixed through the bolt hole. The upper cover plate 2 is lifted up to move the vibration exciter upwards, and finally the excitation point required by the test is reached. The displacement sensor 5 records the rising distance at the same position of the upper cover plate 2 and the bottom plate 6, and feeds back the information to the control box 8. The pressure sensor on the exciter is used for measuring whether the front end of the exciter is in sufficient contact with the excitation point or not, and feeding back a signal to the control box 8.
In light of the foregoing description of preferred embodiments in accordance with the invention, it is to be understood that numerous changes and modifications may be made by those skilled in the art without departing from the scope of the invention. The technical scope of the present invention is not limited to the contents of the specification, and must be determined according to the scope of the claims.
Claims (10)
1. The utility model provides a vibration exciter elevating gear of automobile body mode test which characterized in that: including upper cover plate, bottom plate, supporting mechanism, drive mechanism and control box, be equipped with the motor in the control box, the motor passes through drive mechanism and is connected with the drive of supporting mechanism, supporting mechanism supports between upper cover plate and bottom plate, and supporting mechanism can make the relative bottom plate of upper cover plate reciprocate.
2. The vibration exciter lifting device for the automobile body modal test as recited in claim 1, wherein: the supporting mechanism comprises at least two threaded rolling bearings, the threaded rolling bearings are supported between the upper cover plate and the bottom plate in a balanced mode, and the threaded rolling bearings can drive the upper cover plate to move up and down relative to the bottom plate.
3. The vibration exciter lifting device for the automobile body modal test is characterized in that: the threaded rolling bearing comprises a bearing portion and a rotating shaft portion, the lower end of the rotating shaft portion is fixedly connected with the inner ring of the bearing, the upper end of the rotating shaft portion extends upwards, threads are arranged on the outer wall of the rotating shaft portion, the bearing portion is fixed on the bottom plate, and the upper end of the rotating shaft portion is in threaded connection with the upper cover plate.
4. The vibration exciter lifting device for the automobile body modal test as recited in claim 1, wherein: still include guiding mechanism, guiding mechanism includes at least one direction subassembly, the direction subassembly includes direction stand and guide sleeve, guide sleeve fixes on the upper cover plate, the direction stand bottom is fixed on the bottom plate, and the upper end upwards extends and runs through guide sleeve and upper cover plate, and with guide sleeve clearance fit.
5. The vibration exciter lifting device for the automobile body modal test as recited in claim 1, wherein: the transmission mechanism comprises a worm wheel, a worm wheel output shaft, a driving gear and a driven gear, the worm is arranged on the bottom plate, one end of the worm is in transmission connection with the motor, the bottom of the worm wheel output shaft is fixed on the bottom plate, the worm wheel is coaxially arranged on the worm wheel output shaft and meshed with the worm, the driving gear is further arranged at the upper end of the worm wheel output shaft, the position and the number of the driving gear are matched with those of the supporting mechanism, the driven gear is arranged on the supporting mechanism, and the driving gear and the driven gear are matched to enable the upper cover plate to move up and down relative to the bottom plate.
6. The vibration exciter lifting device for the automobile body modal test is characterized in that: the transmission mechanism further comprises a first gear pair and a second gear pair, the input end of the first gear pair is connected with the rotating shaft of the motor, the output end of the first gear pair is in transmission connection with the input end of the second gear pair through the rotating shaft, and the output end of the second gear pair is connected to one end of the worm.
7. The vibration exciter lifting device for the automobile body modal test is characterized in that: the device also comprises an idler wheel, wherein the idler wheel is rotatably supported on the bottom plate through an idler wheel rotating shaft, and two sides of the idler wheel are respectively meshed with the driving gear and the driven gear.
8. The vibration exciter lifting device for the automobile body modal test as recited in claim 1, wherein: the displacement sensor comprises a transmitting end and a receiving end, the transmitting end and the receiving end are respectively arranged on the upper cover plate and the bottom plate, the transmitting end and the receiving end are vertically opposite, and the displacement sensor is connected with the control box and used for measuring the displacement of the upper cover plate relative to the bottom plate and sending the measuring result to the control box.
9. The vibration exciter lifting device for the automobile body modal test as recited in claim 1, wherein: the vibration exciter is arranged on the upper cover plate, a pressure sensor is arranged at the front end of the vibration exciter and used for measuring the pressure between the front end of the vibration exciter and an excitation point and feeding a pressure signal back to the controller.
10. The vibration exciter lifting device for the automobile body modal test as recited in claim 1, wherein: the motor comprises a high-speed rotation gear and a low-speed rotation gear.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010921459.0A CN114136651A (en) | 2020-09-04 | 2020-09-04 | Vibration exciter lifting device for automobile body modal test |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010921459.0A CN114136651A (en) | 2020-09-04 | 2020-09-04 | Vibration exciter lifting device for automobile body modal test |
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| Publication Number | Publication Date |
|---|---|
| CN114136651A true CN114136651A (en) | 2022-03-04 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202010921459.0A Pending CN114136651A (en) | 2020-09-04 | 2020-09-04 | Vibration exciter lifting device for automobile body modal test |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114923987A (en) * | 2022-05-30 | 2022-08-19 | 沈阳建筑大学 | Vehicle-mounted movable excitation device for steel rail modal test |
| CN115072614A (en) * | 2022-05-23 | 2022-09-20 | 中国第一汽车股份有限公司 | Testing device capable of supporting high-precision horizontal lifting for automobile industry |
-
2020
- 2020-09-04 CN CN202010921459.0A patent/CN114136651A/en active Pending
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115072614A (en) * | 2022-05-23 | 2022-09-20 | 中国第一汽车股份有限公司 | Testing device capable of supporting high-precision horizontal lifting for automobile industry |
| CN114923987A (en) * | 2022-05-30 | 2022-08-19 | 沈阳建筑大学 | Vehicle-mounted movable excitation device for steel rail modal test |
| CN114923987B (en) * | 2022-05-30 | 2024-05-07 | 沈阳建筑大学 | Vehicle-mounted movable excitation device for steel rail modal test |
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