Vibration isolation supporting device for crankshaft dynamic balance test
Through the combined structure of the floating vibration absorbing pad and dynamic column, the serious vibration transmission problem in the crankshaft dynamic balance test is solved, and the efficient vibration isolation effect is achieved, which improves the test accuracy and environmental stability.
Patent Information
- Application Number
- CN202510740836.3
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2025-06-05
- Publication Date
- 2025-08-15
- Estimated Expiration
- Not applicable · inactive patent
AI Technical Summary
The existing crankshaft dynamic balance test support devices mostly use rigid structures, which leads to serious vibration transmission, affects the test accuracy and environmental stability, and lacks effective vibration reduction measures.
The combined structure of floating vibration absorbing pad and dynamic column is adopted. Through the precise coordination between the floating vibration absorbing pad and the bottom bracket, the design of dynamic column and vibration damping sleeve is enhanced to enhance the absorption and damping control of high-frequency vibration, and the elastic recovery force of the pulling spring ensures rapid and stable reset of the system.
It effectively improves vibration isolation performance, reduces vibration transmission, improves test accuracy and stability, and prevents test data distortion and resonance of peripheral equipment.
Smart Images
Figure CN120489444A_ABST
Abstract
Description
Technical Field
[0001] The present invention relates to the technical field of crankshaft detection equipment, in particular to a vibration isolation support device for a crankshaft dynamic balance test. Background Art
[0002] During engine manufacturing and maintenance, the crankshaft, a critical rotating component, has a dynamic balance performance that directly impacts the smooth operation and service life of the entire engine. Therefore, dynamic balancing tests are often required before crankshaft assembly or after repair to verify uniform mass distribution and to adjust the counterweight accordingly. During this test, the crankshaft is mounted on specialized testing equipment and rotated at high speed. Sensors collect vibration signals to analyze the location and magnitude of imbalance.
[0003] Existing crankshaft dynamic balancing test support devices mostly use a rigid support structure. Although this structure can provide the necessary mechanical support to ensure that the crankshaft remains stable during the test, due to its rigidity, it cannot effectively isolate the vibrations generated by the high-speed rotation of the crankshaft. These vibrations will not only be transmitted to the ground or other adjacent equipment through the support structure, affecting the accuracy of the test data, but may also cause resonance in surrounding equipment, further interfering with the stability of the test environment. At the same time, due to the lack of a specially designed vibration reduction structure, existing support devices are difficult to achieve the ideal vibration isolation effect, which to a certain extent limits the accuracy and reliability of the dynamic balancing test. Summary of the Invention
[0004] The purpose of the present invention is to provide a vibration isolation support device for crankshaft dynamic balancing test, so as to solve the problems raised in the above background technology that the current crankshaft dynamic balancing test support devices mostly adopt rigid structures, resulting in serious vibration transmission, lack of effective vibration reduction measures, and affecting test accuracy and environmental stability.
[0005] To achieve the above-mentioned objectives, the present invention provides the following technical solutions: a vibration isolation support device for a crankshaft dynamic balancing test, comprising a support base, a movable seat driven by a guide rail system on the top of the support base, side supports symmetrically provided on the top of the movable seat, a support main frame of which the height can be raised or lowered is provided between the side supports, a support bracket is provided above the support main frame, rollers for supporting the rotation of the crankshaft are symmetrically provided in the middle of the support bracket, and a bottom support plate is provided in the middle of the support main frame through a rectangular recess, a floating vibration-absorbing pad is provided above the bottom support plate and pressed against the bottom of the support bracket, and the bottom plate of the floating vibration-absorbing pad is connected to the bottom support plate through a plurality of dynamic columns.
[0006] Preferably, a vibration-damping sleeve is provided on the outer sleeve of the upper end of the dynamic column, and the edges of the upper and lower ends of the vibration-damping sleeve are respectively fitted with the bottom of the base plate of the floating vibration-absorbing pad and the top of the bottom support plate.
[0007] Preferably, the bottom end of the dynamic column is movable and extends to the outside of the bottom end of the bottom supporting plate, and a tension spring is sleeved on the outside of the dynamic column located at the bottom end of the bottom supporting plate.
[0008] Preferably, a lifting cylinder is provided in the rectangular recess of the supporting main frame, and the output end of the lifting cylinder is fixedly connected to the middle of the bottom of the bottom supporting plate.
[0009] Preferably, auxiliary elastic supports are connected between the two sides of the bottom of the bottom support plate and the bottom inner wall of the rectangular recess supporting the main frame, and the auxiliary elastic supports are in a "C"-shaped structure as a whole.
[0010] Preferably, linkage shafts are provided on both sides of the bottom of the support frame, and through holes matching the linkage shaft structure are provided on both sides of the support main frame, and the bottom end of the linkage shaft passes through the through hole on the support main frame to the outside of the bottom end of the support main frame.
[0011] Preferably, elastic extrusion blocks with an arc-shaped structure are fixed on both sides of the bottom edge of the through hole on the supporting main frame, and a laterally distributed limiting shaft is passed through the bottom end of the linkage shaft, and the upper end part of the limiting shaft is pressed against the inner wall of the elastic extrusion block.
[0012] Preferably, positioning columns are provided on both sides of the top of the support bracket through strip-shaped recesses, and the outer sleeves of the positioning columns are provided with positioning sleeves, and the center of the roller is connected to the outer side of the positioning sleeve through a rotating shaft.
[0013] Preferably, a circular plate is fixedly embedded in the center of the bottom of the supporting main frame, and a plurality of balancing modules are embedded around the circular plate.
[0014] Preferably, a rectangular inlay matching the floating vibration-absorbing pad structure is provided at the bottom of the support bracket, and the support bracket is located in a central position above the supporting main frame.
[0015] Compared with the prior art, the present invention has the following beneficial effects: the vibration isolation support device for crankshaft dynamic balancing tests effectively improves vibration isolation performance, reduces vibration transmission, and enhances test accuracy and stability. The device suppresses vibration transmission to the support structure through the precise fit between the floating vibration-absorbing pad and the base plate. The design of the dynamic column and vibration-damping sleeve enhances effective absorption and damping control of high-frequency vibrations. The elastic restoring force of the tension spring ensures rapid and stable reset of the system during vibration attenuation, avoiding errors caused by energy accumulation. Overall, this significantly improves the device's anti-interference capability and data accuracy during crankshaft dynamic balancing tests. BRIEF DESCRIPTION OF THE DRAWINGS
[0016] Figure 1 This is a schematic structural diagram of a vibration isolation support device for a crankshaft dynamic balancing test according to the present invention;
[0017] Figure 2 This is a schematic diagram of the front view of the structure of the connection between the support bracket and the support main frame of a vibration isolation support device for crankshaft dynamic balancing test of the present invention;
[0018] Figure 3 This is a side view structural diagram of the connection between the support bracket and the support main frame of a vibration isolation support device for crankshaft dynamic balancing test of the present invention;
[0019] Figure 4 This is a schematic diagram of a top view of a support bracket of a vibration isolation support device for a crankshaft dynamic balancing test according to the present invention;
[0020] Figure 5 This is a schematic diagram of the bottom structure of the support main frame of a vibration isolation support device for crankshaft dynamic balancing test of the present invention.
[0021] In the figure: 1. Support base; 2. Moving seat; 3. Side support seat; 4. Support main frame; 5. Support frame; 6. Roller; 7. Bottom support plate; 8. Floating vibration absorbing pad; 9. Dynamic column; 10. Linkage shaft; 11. Limit shaft; 12. Elastic extrusion block; 13. Vibration damping sleeve; 14. Tension spring; 15. Lifting cylinder; 16. Auxiliary elastic support; 17. Positioning column; 18. Positioning sleeve; 19. Circular plate; 20. Balancing module. DETAILED DESCRIPTION
[0022] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. All other embodiments obtained by ordinary technicians in this field based on the embodiments of the present invention without making any creative efforts shall fall within the scope of protection of the present invention.
[0023] See also Figure 1-5The present invention provides a technical solution: a vibration isolation support device for a crankshaft dynamic balancing test, comprising a support base 1, a movable base 2 driven by a guide rail system on the top of the support base 1, symmetrical side supports 3 on the top of the movable base 2, a support main frame 4 with a height that can be raised and lowered is provided between the side supports 3, a lifting mechanism that drives the support main frame 4 to move up and down is provided inside the side supports 3, a support bracket 5 is provided above the support main frame 4, a roller 6 for supporting the rotation of the crankshaft is symmetrically provided in the middle of the support bracket 5, and a bottom support plate 7 is provided in the middle of the support main frame 4 through a rectangular recess, a floating vibration absorbing pad 8 is provided above the bottom of the bottom support plate 7, and the bottom plate of the floating vibration absorbing pad 8 is connected to the bottom support plate 7 through a plurality of dynamic columns 9. When the crankshaft is mounted on the support bracket, this structure On the roller 6 of the support frame 5, the main support frame 4 provides a height-adjustable basic support, and the bottom support plate 7 can be raised and lowered to a suitable height position in the rectangular recess in the middle of the main support frame 4 by the jacking cylinder 15, so that the floating vibration-absorbing pad 8 above it is close to the bottom of the support frame 5, which is used to absorb the vibration energy generated by the high-speed rotation of the crankshaft. The dynamic column 9 connects the bottom plate of the floating vibration-absorbing pad 8 and the bottom support plate 7 to form an elastic support structure. When vibration occurs, the up and down movement of the dynamic column 9 and the elastic deformation of the floating vibration-absorbing pad 8 work together to achieve multi-dimensional isolation and buffering of vertical and partially horizontal vibrations, thereby effectively suppressing the transmission of vibration to the main support frame 4 and the external structure, solving the problem in the prior art that the rigid support structure is used, resulting in poor vibration isolation effect and easy to cause test data To solve the problem of distortion and resonance of peripheral equipment, a vibration-damping sleeve 13 is provided on the outer sleeve of the upper end of the dynamic column 9, and the edges of the upper and lower ends of the vibration-damping sleeve 13 are respectively fitted with the bottom of the bottom plate of the floating vibration-absorbing pad 8 and the top of the bottom support plate 7. The dynamic column 9 of this structure produces reciprocating motion in the up and down directions under the action of vibration, and the vibration-damping sleeve 13 is clamped between the bottom of the bottom plate of the floating vibration-absorbing pad 8 and the top of the bottom support plate 7, which will provide additional damping force during the movement of the dynamic column 9, effectively suppress the transmission of high-frequency vibration, and enhance the vibration absorption coordination and anti-eccentric load capability of the overall structure, thereby further improving the vibration isolation accuracy and system reliability of the device during the dynamic balancing test of the crankshaft. The bottom end of the dynamic column 9 moves through to the outside of the bottom end of the bottom support plate 7, and the dynamic column 9 is located in the outer sleeve of the bottom end of the bottom support plate 7. A tension spring 14 is provided. When vibration occurs, the dynamic column 9 produces vertical displacement, which causes the tension spring 14 to be stretched or compressed, generating a restoring force to buffer the movement amplitude of the dynamic column 9 and prompting the dynamic column 9 to quickly reset during the vibration attenuation stage. This more effectively enhances the response sensitivity and dynamic stability of the entire floating vibration absorption system, and effectively prevents structural instability or energy accumulation caused by excessive vibration impact. A lifting cylinder 15 is fixed with bolts in the rectangular recess of the supporting main frame 4, and the output end of the lifting cylinder 15 is fixedly connected to the middle of the bottom of the bottom support plate 7. This structure drives the bottom support plate 7 fixedly connected to its output end to perform precise lifting and lowering adjustments in the rectangular recess of the supporting main frame 4 by controlling the telescopic action of the lifting cylinder 15.Thereby, real-time adjustment of the height position of the floating vibration-absorbing pad 8 is achieved, so that the floating vibration-absorbing pad 8 can automatically adapt to the optimal contact position according to different crankshaft specifications and test working conditions, ensuring that it always maintains effective contact with the bottom of the support frame 5 and exerts maximum vibration absorption efficiency. Auxiliary elastic supports 16 are connected between the two sides of the bottom of the bottom support plate 7 and the bottom inner wall of the rectangular recess of the supporting main frame 4. The connection between the auxiliary elastic support 16 and the bottom support plate 7 and the supporting main frame 4 is fixed by welding, and the auxiliary elastic support 16 is a "C"-shaped structure as a whole. When the bottom support plate 7 moves up and down, the auxiliary elastic support 16 of this structure undergoes elastic deformation through its "C"-shaped structure, providing a composite elastic support force in the horizontal and vertical directions, effectively enhancing the bottom support plate 7 in motion In order to improve the stability and rebound response ability during the process, linkage shafts 10 are provided on both sides of the bottom of the support bracket 5, and through holes are provided on both sides of the support main frame 4 that match the linkage shaft 10 structure, and the bottom end of the linkage shaft 10 passes through the through hole on the support main frame 4 to the outside of the bottom end of the support main frame 4, and elastic extrusion blocks 12 with an arc-shaped structure are welded and fixed on both sides of the edge of the bottom end of the through hole on the support main frame 4, and the bottom end of the linkage shaft 10 is detachably penetrated by a laterally distributed limiting shaft 11, and the upper end part of the limiting shaft 11 is pressed against the inner wall of the elastic extrusion block 12. When the support bracket 5 is subjected to downward force due to the weight of the crankshaft or vibration, the linkage shaft 10 will subsequently undergo a slight displacement in the through hole of the support main frame 4, and the limiting shaft 11 and the elastic extrusion block 12 will be displaced slightly. Elastic contact pressure is generated between the support bracket 5, which allows it to swing flexibly and move with buffering within the set range while limiting excessive sinking of the support bracket 5. This can also achieve effective response and dispersion of dynamic loads during crankshaft testing, and help enhance the stability and vibration reduction coordination of the entire support structure. Positioning columns 17 are welded and fixed on both sides of the top of the support bracket 5 through strip-shaped recesses, and a positioning sleeve 18 is provided on the outer sleeve of the positioning column 17, and the center of the roller 6 is connected to the outer side of the positioning sleeve 18 through a rotating shaft. A fixing bolt is connected to the positioning sleeve 18 through a threaded structure. This structural positioning sleeve 18 can drive the roller 6 to move synchronously by moving outside the positioning column 17, thereby realizing flexible adjustment of the relative distance between the two rollers 6 to adapt to different lengths and crank distributions. The crankshaft workpiece is fixed with a circular plate 19 at the center of the bottom of the support main frame 4 by bolts, and a number of balancing modules 20 are embedded around the circular plate 19. During the dynamic balancing test of the crankshaft, the circular plate 19 controls the appropriate number of balancing modules 20 to form an adjustable inertial mass system with the support main frame 4, which can be dynamically matched and adjusted according to the imbalance and speed characteristics of the crankshaft being tested, so that when vibration occurs, the inertial force of the balancing module 20 is used to offset part of the vibration energy, thereby ensuring the center of gravity stability and dynamic response consistency of the support main frame 4 during the test. A rectangular inlay is provided at the bottom of the support bracket 5 that matches the structure of the floating vibration absorbing pad 8, and the support bracket 5 is located in the center above the support main frame 4.This structure allows the floating vibration-absorbing pad 8 to fit tightly against the bottom of the support bracket 5 through the rectangular inset at the bottom, ensuring uniform vertical force distribution on the floating vibration-absorbing pad 8. Furthermore, the support bracket 5 is centrally located above the main support frame 4, ensuring that the center of gravity of the roller 6 and crankshaft it carries is aligned with the center of the vibration reduction system, reducing additional disturbances caused by eccentric vibration.
[0024] Working principle: When using the vibration isolation support device for the crankshaft dynamic balancing test, first place the crankshaft to be tested in the middle position of the top of the support bracket 5, and control the distance between the two rollers 6 by adjusting the position of the positioning sleeve 18 outside the positioning column 17, so that the rollers 6 form a stable support for the journals at both ends of the crankshaft. Then, by starting the jacking cylinder 15, the bottom support plate 7 connected to its output end rises along the rectangular recess to adjust the fit between the floating vibration absorbing pad 8 and the bottom of the support bracket 5, ensuring that it is embedded in the rectangular recess at the bottom of the support bracket 5 and is in an effective position. Contact position, after completing the initial height adjustment, start the guide rail system to drive the moving seat 2 to move horizontally on the support base 1, driving the side support 3 and the supporting main frame 4 to move as a whole to the test station. During the test, the crankshaft begins to rotate. At this time, the linkage shaft 10 is slightly displaced as the support bracket 5 is subjected to force. The limit shaft 11 cooperates with the elastic extrusion block 12 to achieve flexible constraint. At the same time, the dynamic column 9 generates elastic movement between the floating vibration absorbing pad 8 and the bottom support plate 7, and provides a reset force through the tension spring 14 to maintain the stability of the structure, thereby completing a series of tasks.
[0025] Although the present invention has been described in detail with reference to the aforementioned embodiments, it is still possible for those skilled in the art to modify the technical solutions described in the aforementioned embodiments, or to make equivalent substitutions for some of the technical features therein. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.
Claims
1. A vibration isolation support device for a crankshaft dynamic balancing test, comprising a support base (1), a top portion of the support base (1) being driven by a guide rail system to provide a movable seat (2), characterized in that: The top of the movable seat (2) is symmetrically provided with side supports (3), a main support frame (4) with a height that can be raised or lowered is provided between the side supports (3), a support frame (5) is provided above the main support frame (4), a roller (6) for supporting the rotation of the crankshaft is symmetrically provided in the middle of the support frame (5), and a bottom support plate (7) is provided in the middle of the main support frame (4) through a rectangular recess, a floating vibration absorbing pad (8) is provided above the bottom support plate (7) and is pressed against the bottom of the support frame (5), and the bottom plate of the floating vibration absorbing pad (8) is connected to the bottom support plate (7) through a plurality of dynamic columns (9).
2. The vibration isolation support device for crankshaft dynamic balancing test according to claim 1, characterized in that: The outer sleeve of the upper end of the dynamic column (9) is provided with a vibration-damping sleeve (13), and the edges at the upper and lower ends of the vibration-damping sleeve (13) are respectively fitted with the bottom of the bottom plate of the floating vibration-absorbing pad (8) and the top of the bottom support plate (7).
3. The vibration isolation support device for crankshaft dynamic balancing test according to claim 1, characterized in that: The bottom end of the dynamic column (9) is movable and extends to the outside of the bottom end of the bottom support plate (7), and a tension spring (14) is sleeved on the outside of the dynamic column (9) located at the bottom end of the bottom support plate (7).
4. The vibration isolation support device for crankshaft dynamic balancing test according to claim 1, characterized in that: A lifting cylinder (15) is provided in the rectangular recess of the supporting main frame (4), and the output end of the lifting cylinder (15) is fixedly connected to the middle of the bottom of the bottom supporting plate (7).
5. The vibration isolation support device for crankshaft dynamic balancing test according to claim 4, characterized in that: Auxiliary elastic supports (16) are connected between the two sides of the bottom of the bottom support plate (7) and the bottom inner wall of the rectangular recess of the supporting main frame (4), and the auxiliary elastic supports (16) are in a "C"-shaped structure as a whole.
6. The vibration isolation support device for crankshaft dynamic balancing test according to claim 1, characterized in that: Both sides of the bottom of the support frame (5) are provided with linkage shafts (10), and both sides of the supporting main frame (4) are provided with through holes that match the linkage shaft (10) structure, and the bottom end of the linkage shaft (10) passes through the through holes on the supporting main frame (4) to the outside of the bottom end of the supporting main frame (4).
7. The vibration isolation support device for crankshaft dynamic balancing test according to claim 6, characterized in that: Elastic extrusion blocks (12) with an arc-shaped structure are fixed on both sides of the bottom edge of the through hole on the supporting main frame (4), and a horizontally distributed limiting shaft (11) is passed through the bottom end of the linkage shaft (10), and the upper end portion of the limiting shaft (11) is pressed against the inner wall of the elastic extrusion block (12).
8. The vibration isolation support device for crankshaft dynamic balancing test according to claim 1, characterized in that: Positioning columns (17) are provided on both sides of the top of the support frame (5) through strip-shaped recesses, and the outer sleeve of the positioning column (17) is provided with a positioning sleeve (18), and the center of the roller (6) is connected to the outer side of the positioning sleeve (18) through a rotating shaft.
9. The vibration isolation support device for crankshaft dynamic balancing test according to claim 1, characterized in that: A circular plate (19) is fixedly embedded in the center of the bottom of the supporting main frame (4), and a plurality of balancing modules (20) are embedded around the circular plate (19).
10. The vibration isolation support device for crankshaft dynamic balancing test according to claim 1, characterized in that: The bottom of the support frame (5) is provided with a rectangular inlay that matches the structure of the floating vibration absorbing pad (8), and the support frame (5) is located in the center above the supporting main frame (4).