Dynamically adjustable torsion damper

Abstract

The invention discloses a dynamic adjustable torsion damper, and relates to the technical field of mechanical transmission. The problems that an existing complex transmission system needs to be provided with a plurality of torsion dampers with different parameters, and use is very inconvenient are solved. The device comprises a supporting base, a first box body, a rotating shaft and a connecting shaft, the first box body is installed on the supporting base, the rotating shaft is connected with a plurality of mass blocks capable of moving in the radial direction, and the mass blocks are evenly distributed in the circumferential direction; in the continuous operation process of the complex transmission system, the radial distance between the mass block and the rotating shaft can be adjusted according to the torsional vibration condition in the actual operation process, the inherent frequency of the torsional vibration damper is continuously adjusted by changing the rotating inertia, torsional vibration energy is absorbed from the complex transmission system through reverse-phase torsional vibration coupling, and the torsional vibration damper is used for continuously adjusting the torsional vibration energy. And the elastic damping pieces are consumed, the multi-frequency-band torsion vibration reduction effect in the full-operation working condition range is achieved, the application range is wider, and use is more convenient.

Description

Technical Field

[0001] The invention relates to the technical field of mechanical transmission, and in particular to a dynamically adjustable torsional vibration damper. Background Art

[0002] Torsional vibration of the rotating machinery shaft system is a form of vibration in the rotation direction. When the transmission elements such as couplings, drive shafts, gears on the shaft system experience torsional vibration, it will cause tangential alternating torsional stress inside the material. If the torsion amplitude is too large and the shear stress exceeds the elastic limit, fatigue accumulation will occur in the material. When the fatigue accumulates to the service life, cracks will begin to appear in the material. The cracks will gradually develop and eventually lead to a serious accident of material breakage.

[0003] In the prior art, vibration reduction devices such as TVD torsional vibration dampers, dual-mass flywheels, and elastic couplings are generally used to change the response of the system under torsional excitation. In complex transmission systems, such as power system test benches, the transmission system must take into account the spatial position and speed ratio requirements of related transmission parts. It is composed of multiple couplings, drive shafts, and gear pairs. The system has more torsional degrees of freedom and more natural frequencies. Multiple torsional natural frequencies will be encountered within the operating frequency. The use of series elastic couplings or parallel TVD torsional vibration dampers often cannot solve the vibration reduction needs of complex transmission systems at multiple torsional natural frequencies. If torsional vibrations in multiple frequency bands need to be attenuated, it is often necessary to set multiple torsional vibration dampers with different parameters, which is very inconvenient to use.

[0004] In summary, the existing complex transmission system needs to be equipped with multiple torsional vibration dampers with different parameters, which is very inconvenient to use. Summary of the invention

[0005] The purpose of the present invention is to solve the problem that the existing complex transmission system needs to be equipped with multiple torsional vibration dampers with different parameters, which is very inconvenient to use, and further provide a dynamically adjustable torsional vibration damper.

[0006] The technical solution of the present invention is: a dynamically adjustable torsional vibration damper, comprising: a support base, a first housing, a rotating shaft and a connecting shaft, wherein the first housing is mounted on the support base, one end of the rotating shaft passes through the first housing and is mounted on the inner ring of a first bearing in the first housing, one end of the connecting shaft is connected to one end of the rotating shaft passing through the first housing through a first flange, the other end of the connecting shaft is connected to an output shaft of a complex transmission system through a second flange, and an elastic damping member is connected to the first flange and / or the second flange, and the elastic damping member is used to absorb torsional vibration energy;

[0007] The rotating shaft is connected with a mass block that can move in the radial direction. The mass blocks are uniformly distributed along the circumference. The rotational inertia is adjusted by changing the radial distance between the mass blocks and the rotating shaft, thereby dynamically adjusting the torsional natural frequency.

[0008] Furthermore, the rotating shaft is connected to a first annular seat and a second annular seat which can approach or move away from each other along the axial direction, and each of the mass blocks is rotatably connected to two rod bodies, the free end of one of the rod bodies is hingedly connected to the first annular seat, and the free end of the other rod body is hingedly connected to the second annular seat.

[0009] Furthermore, the first annular seat is located on a side close to the first housing and is fixedly connected to the rotating shaft, the second annular seat is located on a side away from the first housing and is splined with the rotating shaft, a second housing is slidably connected to the support base, one end of the second annular seat is mounted on an inner ring of a second bearing in the second housing, the second housing is connected to a driving end of a driving member, and the driving member is used to drive the second housing to move axially.

[0010] Furthermore, the driving member is a motor installed on the supporting base, and the driving end of the motor is connected to the second box through a transmission assembly.

[0011] Furthermore, the transmission assembly includes: a screw rod installed on the driving end of the motor, one end of the screw rod passes through the second box body and is threadedly connected to the second box body.

[0012] Furthermore, the support base has two symmetrically arranged guide rails, and the second box body is connected to a sliding block for cooperating with the guide rails.

[0013] Furthermore, the mass block includes two disc structures that are spaced apart, the two disc structures are connected via a transverse axis, and two rods are rotatably connected to the transverse axis and are located between the two disc structures.

[0014] Furthermore, the elastic damping member is a rubber block, which is respectively mounted on the first flange and the second flange.

[0015] Furthermore, the rubber block is detachably mounted on the first flange and the second flange by bolts.

[0016] Compared with the prior art, the present invention has the following effects:

[0017] 1. The dynamically adjustable torsional vibration damper provided by the present invention can adjust the radial distance between the mass block and the rotating shaft in combination with the torsional vibration conditions during the continuous operation of the complex transmission system, and continuously adjust the natural frequency of the torsional vibration damper by changing the rotational inertia. When the natural torsional vibration frequency of the torsional vibration damper is close to the torsional vibration frequency of the complex transmission system, its torsional vibration will be coupled with the complex transmission system, and the torsional vibration energy will be absorbed from the complex transmission system through the torsional vibration coupling of the anti-phase, and consumed by the elastic damping member, thereby realizing the multi-band torsional vibration reduction effect within the full operating condition range, with a wider range of application and more convenient use.

[0018] 2. The dynamically adjustable torsional vibration damper provided by the present invention can cause relative rotation between the rod body and the mass block by bringing the first annular seat and the second annular seat closer to or farther away from each other, thereby driving the mass block to move radially to adjust the rotational inertia.

[0019] 3. In the dynamically adjustable torsional vibration damper provided by the present invention, the threaded connection between the screw rod and the second housing has a self-locking property, so that the second housing stays firmly in the corresponding position and is not easily changed, making the torsional vibration damper operate more stably. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 It is a schematic diagram of the overall structure of the dynamically adjustable torsional vibration damper of the present invention;

[0021] Figure 2 yes Figure 1 A cross-sectional view of

[0022] Figure 3 yes Figure 1 Side view of

[0023] Figure 4 yes Figure 2 A magnified image of area A;

[0024] Figure 5 yes Figure 2 Enlarged view of area B;

[0025] Figure 6 yes Figure 2 Magnified view of area C.

[0026] In the figure: 1. support base; 2. first box body; 3. rotating shaft; 4. connecting shaft; 5. first bearing; 6. first flange; 7. second flange; 8. complex transmission system; 9. elastic damping member; 10. mass block; 11. first annular seat; 12. second annular seat; 13. rod body; 14. second box body; 15. second bearing; 16. driving member; 17. transmission assembly; 18. guide rail; 19. slider; 20. horizontal axis; 21. bolt. DETAILED DESCRIPTION

[0027] Specific implementation method 1: Combination Figures 1 to 5 The present embodiment is described. The present embodiment includes a support base 1, a first housing 2, a rotating shaft 3 and a connecting shaft 4. The first housing 2 is installed on the support base 1. The first housing 2 has a lubrication system, a cooling system and a first bearing 5 inside. The first housing 2 mainly provides suitable support stiffness, lubrication and sealing for the first bearing 5 to ensure its reasonable cooling and clean operating environment. One end of the rotating shaft 3 passes through the first housing 2 and is installed on the inner ring of the first bearing 5. One end of the connecting shaft 4 is connected to the end of the rotating shaft 3 passing through the first housing 2 through a first flange 6. The other end of the connecting shaft 4 is connected to the output shaft of the complex transmission system 8 through a second flange 7. The connection method here is a parallel connection. An elastic damping member 9 is connected to the first flange 6 and / or the second flange 7. The elastic damping member 9 is used to absorb the torsional vibration energy transmitted from the complex transmission system 8. A radially movable mass block 10 is connected to the rotating shaft 3. The mass block 10 has a plurality of masses evenly distributed along the circumferential direction. The rotational inertia is adjusted by changing the radial distance between the plurality of mass blocks 10 and the rotating shaft 3, thereby dynamically adjusting the torsional natural frequency.

[0028] It should be noted that only when the natural torsional vibration frequency of the torsional damper is close to the torsional vibration frequency of the complex transmission system 8, its torsional vibration will be coupled with the complex transmission system 8, and then the torsional vibration energy will be absorbed by the elastic damping member 9. For a torsional elastic rod, such as an axis, its torsional natural frequency is related to the torsional stiffness and the moment of inertia. The moment of inertia is a measure of the inertia of an object with respect to the rotating axis 3, which depends on the mass distribution of the object and the position of the rotating axis 3. As the position between the mass block 10 and the rotating axis 3 changes, the mass distribution also changes accordingly, thereby adjusting the moment of inertia and then dynamically adjusting the torsional natural frequency.

[0029] The dynamically adjustable torsional vibration damper of this embodiment can adjust the radial distance between the mass block 10 and the rotating shaft 3 during the continuous operation of the complex transmission system 8 in combination with the torsional vibration conditions during actual operation, and continuously adjust the natural frequency of the torsional vibration damper by changing the rotational inertia. When the natural torsional vibration frequency of the torsional vibration damper is close to the torsional vibration frequency of the complex transmission system 8, its torsional vibration will be coupled with the complex transmission system 8, and the torsional vibration energy will be absorbed from the complex transmission system 8 through anti-phase torsional vibration coupling, and consumed by the elastic damping member 9, thereby realizing multi-band torsional vibration reduction within the full operating range, with a wider range of applications and more convenient use.

[0030] Specific implementation method 2: Combination Figure 2 , Figure 5 , Figure 6This embodiment is described. The difference between this embodiment and the first embodiment is that the rotating shaft 3 is connected with a first annular seat 11 and a second annular seat 12 that can move closer to or farther from each other in the axial direction. Two rod bodies 13 are rotatably connected to each mass block 10. The free end of one rod body 13 is hingedly connected to the first annular seat 11, and the free end of the other rod body 13 is hingedly connected to the second annular seat 12. The first annular seat 11 and the second annular seat 12 move closer to or farther from each other, so that the rod body 13 and the mass block 10 can rotate relative to each other, thereby driving the mass block 10 to move radially to adjust the rotational inertia. Other components and connection relationships are the same as those of the first embodiment.

[0031] Specific implementation method three: Combination Figure 1 , Figure 2 , Figure 5 , Figure 6 The present embodiment is described. The present embodiment differs from the second embodiment in that the first annular seat 11 is located on a side close to the first housing 2 and is fixedly connected to the rotating shaft 3, the second annular seat 12 is located on a side away from the first housing 2 and is splined with the rotating shaft 3, a second housing 14 is slidably connected to the support base 1, one end of the second annular seat 12 is mounted on an inner ring of a second bearing 15 in the second housing 14, the second housing 14 has a lubrication system, a cooling system, and a second bearing 15 inside, the second housing 14 mainly provides suitable support stiffness, lubrication, and sealing for the second bearing 15 to ensure reasonable cooling and a clean operating environment, the second housing 14 is connected to the driving end of a driving member 16, the driving member 16 is used to drive the second housing 14 to move axially, the second housing 14 can drive the second annular seat 12 to move, and thus change the radial position of the mass block 10. Of course, the above description is not restrictive. As an alternative embodiment, the first annular seat 11 and the second annular seat 12 can also be splined with the connecting shaft 4, and a telescopic rod is arranged between the first annular seat 11 and the second annular seat 12, and the first annular seat 11 and the second annular seat 12 are controlled to approach or move away from each other by the telescopic rod. Other components and connection relationships are the same as those of the second embodiment.

[0032] Specific implementation method four: Combination Figure 1 This embodiment is described. The difference between this embodiment and the third embodiment is that the driving member 16 is a motor installed on the support base 1. The driving end of the motor is connected to the second box 14 through the transmission assembly 17. The second box 14 can be driven to move by the rotation of the motor. The motor provides driving power, no manual operation is required, and it is easy to control, and the use effect is better. Of course, the above description is not restrictive. As an alternative embodiment, the driving member 16 can also be selected as a hydraulic cylinder, a pneumatic cylinder, etc., and its piston rod is connected to the second box 14. Other components and connection relationships are the same as those of the third embodiment.

[0033] Specific implementation method five: Combination Figure 1 This embodiment is described. The difference between this embodiment and the fourth embodiment is that the transmission assembly 17 includes a screw, which is installed on the driving end of the motor. One end of the screw passes through the second housing 14 and is threadedly connected to the second housing 14. The motor is arranged horizontally, and the motor drives the screw to rotate. The screw and the second housing 14 are threadedly matched to drive the second housing 14 to move axially. The threaded connection has self-locking properties, so that the second housing 14 stays firmly in the corresponding position and is not easy to change, so that the torsional vibration damper can operate more stably. Of course, the above description is not restrictive. As an alternative embodiment, the transmission assembly 17 can also be a gear rack that meshes with each other, the rack is installed on the second housing 14, and the gear is installed on the driving end of the motor. Other components and connection relationships are the same as those of the fourth embodiment.

[0034] Specific implementation method six: Combination Figure 1 This embodiment is described. The difference between this embodiment and the third embodiment is that the support base 1 has two symmetrically arranged guide rails 18, and the second box body 14 is connected with a slider 19 for cooperating with the guide rails 18. The guide rails 18 can play a guiding role, so that the second box body 14 moves along a fixed path. Of course, the above description is not restrictive. As an alternative embodiment, a slide groove can also be provided on the second box body 14, and an insert block that slides with the slide groove can be provided on the support base 1. Other components and connection relationships are the same as those of the third embodiment.

[0035] Specific implementation method seven: Combination Figure 1 , Figure 3 This embodiment is described. The difference between this embodiment and the second embodiment is that the mass block 10 includes two disc structures arranged at intervals, and the two disc structures are connected by a transverse axis 20. The two rod bodies 13 are rotatably connected to the transverse axis 20 and located between the two disc structures. The two disc structures can limit the rod bodies 13, so that the rod bodies 13 and the transverse axis 20 are firmly connected. Of course, the above description is not restrictive. As an alternative embodiment, the mass block 10 can also be other structures such as a rectangular structure, and the transverse axes 20 are respectively set on its two sides, and the rod bodies 13 are rotatably installed on the transverse axis 20. The other components and connection relationships of other shapes are the same as those of the second embodiment.

[0036] Specific implementation method eight: Combination Figure 2 , Figure 4This embodiment is described. The difference between this embodiment and the first embodiment is that the elastic damping member 9 is a rubber block, which is respectively installed on the first flange 6 and the second flange 7. The rubber block has a better effect of absorbing vibration energy, and the number of rubber blocks is greater, which further enhances the energy absorption effect. Of course, the above description is not restrictive. As an alternative embodiment, the elastic damping member 9 can be only arranged on the first flange 6, or only arranged on the second flange 7. Other components and connection relationships are the same as any one of the first to seventh embodiments.

[0037] Specific implementation method nine: Combination Figure 1 , Figure 2 This embodiment is described. The difference between this embodiment and the eighth embodiment is that the rubber block is detachably mounted on the first flange 6 and the second flange 7 by bolts 21. After the rubber block has been used for a certain period of time, the rubber block can be quickly replaced, which makes maintenance more convenient. Of course, the above description is not restrictive. As an alternative embodiment, the rubber block can also be mounted on the first flange 6 and the second flange 7 in an embedded manner. Other components and connection relationships are the same as those of the eighth embodiment.

[0038] How to use this implementation:

[0039] First, the connecting shaft 4 is connected to the output shaft of the complex transmission system 8 through the second flange 7, thereby driving the rotating shaft 3 to rotate. At this time, the natural frequency of the torsional vibration damper is adjusted, and the motor is started. The motor drives the screw to rotate, and the screw and the second box body 14 are threadedly matched to make the second box body 14 move along the guide rail 18. The second box body 14 will drive the second annular seat 12 to move, so that the rod body 13 rotates, thereby driving the mass block 10 to move radially until it is close to the torsional vibration frequency of the complex transmission system 8 and the vibration energy is absorbed by the rubber block.

[0040] The content of the present invention is not limited to the content of the above-mentioned embodiments. The combination of one or several specific embodiments can also achieve the purpose of the invention.

Claims

1. A dynamically adjustable torsional vibration damper, comprising: A support base (1), a first housing (2), a rotating shaft (3) and a connecting shaft (4), wherein the first housing (2) is mounted on the support base (1), one end of the rotating shaft (3) passes through the first housing (2) and is mounted on the inner ring of a first bearing (5) in the first housing (2), one end of the connecting shaft (4) is connected to one end of the rotating shaft (3) passing through the first housing (2) via a first flange (6), the other end of the connecting shaft (4) is connected to an output shaft of a complex transmission system (8) via a second flange (7), and an elastic damping member (9) is connected to the first flange (6) and / or the second flange (7), and the elastic damping member (9) is used to absorb torsional vibration energy; The invention is characterized in that a mass block (10) movable in the radial direction is connected to the rotating shaft (3), and the mass blocks (10) are uniformly distributed in the circumferential direction. The rotational inertia is adjusted by changing the radial distance between the mass blocks (10) and the rotating shaft (3), thereby dynamically adjusting the torsional natural frequency.

2. A dynamically adjustable torsional vibration damper according to claim 1, characterized in that: The rotating shaft (3) is connected to a first annular seat (11) and a second annular seat (12) which can move closer to or farther from each other along the axial direction. Each mass block (10) is rotatably connected to two rod bodies (13), the free end of one of the rod bodies (13) being hingedly connected to the first annular seat (11), and the free end of the other of the rod bodies (13) being hingedly connected to the second annular seat (12).

3. A dynamically adjustable torsional vibration damper according to claim 2, characterized in that: The first annular seat (11) is located on a side close to the first housing (2) and is fixedly connected to the rotating shaft (3); the second annular seat (12) is located on a side away from the first housing (2) and is spline-matched with the rotating shaft (3); a second housing (14) is slidably connected to the support base (1); one end of the second annular seat (12) is mounted on an inner ring of a second bearing (15) in the second housing (14); the second housing (14) is connected to a driving end of a driving member (16); and the driving member (16) is used to drive the second housing (14) to move axially.

4. A dynamically adjustable torsional vibration damper according to claim 3, characterized in that: The driving member (16) is a motor mounted on the supporting base (1), and the driving end of the motor is connected to the second box (14) via a transmission assembly (17).

5. A dynamically adjustable torsional vibration damper according to claim 4, characterized in that: The transmission assembly (17) comprises a screw rod mounted on the driving end of the motor, one end of the screw rod passing through the second housing (14) and being threadedly connected to the second housing (14).

6. The dynamically adjustable torsional vibration damper according to claim 3, characterized in that: The support base (1) is provided with two symmetrically arranged guide rails (18), and the second box body (14) is connected with a sliding block (19) for cooperating with the guide rails (18).

7. The dynamically adjustable torsional vibration damper according to claim 2, characterized in that: The mass block (10) comprises two disc structures arranged at an interval, the two disc structures are connected via a transverse axis (20), and two rod bodies (13) are rotatably connected to the transverse axis (20) and are located between the two disc structures.

8. A dynamically adjustable torsional vibration damper according to any one of claims 1 to 7, characterized in that: The elastic damping member (9) is a rubber block, which is respectively mounted on the first flange (6) and the second flange (7).

9. The dynamically adjustable torsional vibration damper according to claim 8, characterized in that: The rubber block is detachably mounted on the first flange (6) and the second flange (7) by means of bolts (21).

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