CN111250380A - Eccentric vibrator - Google Patents
Eccentric vibrator Download PDFInfo
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- CN111250380A CN111250380A CN201910736058.5A CN201910736058A CN111250380A CN 111250380 A CN111250380 A CN 111250380A CN 201910736058 A CN201910736058 A CN 201910736058A CN 111250380 A CN111250380 A CN 111250380A
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- eccentric body
- eccentric
- bearing
- shaft hole
- circumferential surface
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B06—GENERATING OR TRANSMITTING MECHANICAL VIBRATIONS IN GENERAL
- B06B—METHODS OR APPARATUS FOR GENERATING OR TRANSMITTING MECHANICAL VIBRATIONS OF INFRASONIC, SONIC, OR ULTRASONIC FREQUENCY, e.g. FOR PERFORMING MECHANICAL WORK IN GENERAL
- B06B1/00—Methods or apparatus for generating mechanical vibrations of infrasonic, sonic, or ultrasonic frequency
- B06B1/10—Methods or apparatus for generating mechanical vibrations of infrasonic, sonic, or ultrasonic frequency making use of mechanical energy
- B06B1/16—Methods or apparatus for generating mechanical vibrations of infrasonic, sonic, or ultrasonic frequency making use of mechanical energy operating with systems involving rotary unbalanced masses
- B06B1/161—Adjustable systems, i.e. where amplitude or direction of frequency of vibration can be varied
- B06B1/162—Making use of masses with adjustable amount of eccentricity
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Apparatuses For Generation Of Mechanical Vibrations (AREA)
Abstract
An eccentric oscillator belongs to the technical field of vibrating machinery and comprises an outer eccentric body (1) and an inner eccentric body (2), wherein the outer eccentric body (1) is provided with an inner circumferential surface, the inner eccentric body (2) is provided with an outer circumferential surface, and at least one first bearing (41) is arranged between the inner circumferential surface and the outer circumferential surface; the centers of gravity of the inner eccentric body (2) and the outer eccentric body (1) are deviated from the centre of rotation formed by the first bearing (41); the outer eccentric body (1) is provided with a left pillow block (10) which is coaxial with the first bearing (41), and the right sides of the outer eccentric body (1) and the inner eccentric body (2) are provided with a right end cover (3). Compared with the prior art, the eccentric vibrator provided by the invention can adjust the included angle of the two eccentric bodies during rotation to adjust the exciting force; the size of the exciting force can be adjusted to be zero in a dynamic state, so that the load of the vibration exciter during starting can be reduced.
Description
Technical Field
The invention belongs to the technical field of vibrating machinery, and particularly relates to an eccentric vibrator applied to a vibration exciter of the vibrating machinery.
Background
The vibration exciter is a relatively central component in a vibrating machine and is a mechanical vibration generation source. The existing mechanical vibration exciter mainly comprises a motor and an eccentric vibrator, wherein the motor drives the eccentric vibrator to move to generate mechanical vibration. The eccentric vibrator generally comprises two eccentric structures, and the size of the exciting force is adjusted by adjusting the included angle of the two eccentric structures. The existing eccentric vibrator structure mainly has two forms. In a first structure, as shown in fig. 1, the eccentric vibrator includes two fan-shaped eccentric bodies arranged side by side: a right eccentric body 100 and a left eccentric body 200. The eccentric vibrator with the structure can be adjusted to the minimum zero exciting force in the rotation direction in a static state. However, because the revolution surfaces of the two fan-shaped eccentric bodies are arranged on the left and the right and are not on the same plane, the excitation force of the whole vibrator cannot be 0, namely the whole vibrator can be adjusted to be in static balance but in dynamic unbalance. In a second configuration, as shown in fig. 2, the eccentric vibrator includes an inner eccentric body 300 and an outer eccentric body 400 coaxially disposed. When the magnitude of the exciting force is adjusted, the rotation centers of the inner eccentric body 300, the outer eccentric body 400 and the whole eccentric vibrator are not in one center. The eccentric vibrator with the structure can only manually adjust the included angle between the inner eccentric angle and the outer eccentric angle in a static state, namely, the size of the exciting force is adjusted, and the exciting force cannot be adjusted in a rotating state.
Disclosure of Invention
Aiming at the defects of the prior art, the invention provides the eccentric vibrator capable of adjusting the exciting force in the rotating process.
An eccentric vibrator comprising an outer eccentric body (1) and an inner eccentric body (2), the outer eccentric body (1) having an inner circumferential surface, the inner eccentric body (2) having an outer circumferential surface, at least one first bearing (41) being provided between the inner circumferential surface and the outer circumferential surface; the centers of gravity of the inner eccentric body (2) and the outer eccentric body (1) are deviated from the centre of rotation formed by the first bearing (41); the outer eccentric body (1) is provided with a left pillow block (10) which is coaxial with the first bearing (41), and the left pillow block (10) is provided with a first shaft hole (11) which is coaxial with the first bearing (41); the inner eccentric body (2) is provided with a second shaft hole (21) which is coaxial with the first bearing (41); a right end cover (3) is arranged on the right sides of the outer eccentric body (1) and the inner eccentric body (2), and the right end cover (3) is tightly attached to the right side surface of the outer ring of the first bearing (41); the right end cover (3) is provided with a third shaft hole (31) which is coaxial with the first bearing (41).
In order to enable the right end cover (3) to be stably abutted against the right side of the first bearing (41), the right end cover (3) is provided with a raised pressing ring (32), and the pressing ring (32) is abutted against the right side of the outer ring of the first bearing (41). The right end cover (3) and the outer eccentric body (1) are fixedly connected by using a bolt or welding mode and the like.
According to the eccentric vibrator provided by the invention, as the gravity centers of the inner eccentric body (2) and the outer eccentric body (1) deviate from the rotation center formed by the first bearing (41), and the inner eccentric body (2) is installed in the inner cavity of the outer eccentric body (1) through the first bearing (41), the inner eccentric body (2) can flexibly rotate in the outer eccentric body (1), and the adjustment of the included angle of the two eccentric bodies in the rotation process can be realized to adjust the exciting force.
Because the inner eccentric body (2) is arranged in the inner cavity of the outer eccentric body (1) through the first bearing (41), and two eccentric body revolution surfaces of the eccentric vibrator are arranged on the same plane, the adjustment of the exciting force to be zero can be realized, and the load of the vibration exciter during starting is reduced.
For the convenience of installation fixed first bearing (41), outer eccentric body (1) interior circumference surface is equipped with first interior step face (12) to keeping away from the direction of axle center on, interior eccentric body (2) outer circumference surface is equipped with first outer step face (22) to the direction that is close to the axle center, first interior step face (12) with first outer step face (22) form first step face, first bearing (41) inside, outer lane left surface seat in on the first step face. In order to fix the right side of the inner ring of the first bearing (41), a retainer ring (25) is arranged on the outer circumferential surface of the inner eccentric body (2), and the retainer ring (25) is fixedly connected with the inner eccentric body (2) in a threaded or hot-fitting mode.
For a larger eccentric vibrator, in order to increase the stability between an inner eccentric body and an outer eccentric body of the eccentric vibrator, a second bearing (42) is further arranged between the outer eccentric body (1) and the inner eccentric body (1), in order to facilitate installation and fixation, a first inner step surface (12) is arranged on the inner circumferential surface of the outer eccentric body (1) in the direction away from the axis, a convex ring (23) is arranged in the middle position of the outer circumferential surface of the inner eccentric body (2) in the direction away from the axis, a space for accommodating the first bearing (41) is formed between the left step surface of the convex ring (23) and the first inner step surface (12), and a space for accommodating the second bearing (42) is formed between the right step surface of the convex ring (23) and a pressure ring (32) of the right end cover (3).
Furthermore, a support ring (43) is arranged between the outer ring of the first bearing (41) and the outer ring of the second bearing (42) for better fixing of the first bearing (41) and the second bearing (42).
In order to realize dynamic adjustment of the exciting force of the eccentric vibrator, the invention provides a further scheme that: the first shaft hole (11) of the left pillow block (10), the second shaft hole (21) of the inner eccentric body (2) and the third shaft hole (31) of the right end cover (3) are sleeved on a connecting shaft (5) in sequence, and a connecting part of the connecting shaft (5) and the second shaft hole (21) is provided with a spiral groove and boss matching structure; the connecting portion of the connecting shaft (5) and the third shaft hole (31) is provided with a linear groove and boss matching structure.
One specific structural form is as follows: a first spiral groove (51) and a first straight line groove (52) are sequentially arranged on the connecting shaft (5) from left to right; a first boss (24) matched with the first spiral groove (51) is arranged on the inner wall of the second shaft hole (21); and a second boss (33) matched with the first straight line groove (52) is arranged on the inner wall of the third shaft hole (31).
In order to increase the connection stability, it is preferable that at least two first bosses (24) are provided on a trajectory line cooperating with the first spiral groove (51); at least two second bosses (33) are arranged on a track line matched with the first linear groove (52).
The motion process is as follows: promote connecting axle (5) move left or right, drive first spiral groove (51) with first straight line recess (52) move left or right, drive first boss (24) are followed first spiral groove (51) rotate, because connecting axle (5) first straight line recess (52) with in third shaft hole (31) second boss (33) cooperation, connecting axle (5) with right-hand member lid (3) with outer eccentric body (1) remain motionless on the circumferencial direction, realized interior eccentric body (2) with the change of contained angle between two eccentric bodies of outer eccentric body (1), realize the dynamic adjustment of the exciting force of this eccentric oscillator according to this.
Another scheme is as follows: a second spiral groove is formed in the inner wall of the second shaft hole (21); a second linear groove is formed in the inner wall of the third shaft hole (31); and a third boss matched with the second spiral groove and a fourth boss matched with the second linear groove are sequentially arranged on the connecting shaft (5) from left to right.
In order to increase the connection stability, it is preferable that at least two of the third bosses are arranged on a trajectory line matched with the second spiral groove; and at least two fourth bosses are arranged on a track line matched with the second straight line groove.
The motion process is as follows: promote connecting axle (5) move left or right, drive third boss and fourth boss move left or right, drive second spiral groove rotates, connecting axle (5) with right-hand member lid (3) with outer eccentric body (1) remain motionless on the circumferencial direction, realize the change of contained angle between two eccentric bodies, adjust the dynamic adjustment of this eccentric oscillator's exciting force according to this.
Compared with the prior art, the eccentric vibrator provided by the invention can adjust the included angle of the two eccentric bodies during rotation to adjust the exciting force; the size of the exciting force can be adjusted to be zero in a dynamic state, so that the load of the vibration exciter during starting can be reduced.
Drawings
FIG. 1 is a schematic view of a prior art eccentric vibrator;
FIG. 2 is a schematic view of another prior art eccentric vibrator;
FIG. 3 is a schematic structural diagram of an embodiment 1 of an eccentric vibrator according to the present invention;
FIG. 4 is a schematic structural diagram of an embodiment 1 of an eccentric vibrator according to the present invention, adjusted to zero exciting force;
FIG. 5 is a schematic view of an eccentric vibrator of embodiment 1 of the present invention adjusted to maximize an exciting force;
FIG. 6 is a schematic structural view of an embodiment 2 of an eccentric vibrator according to the present invention;
fig. 7 is a schematic structural view of an eccentric vibrator according to embodiment 3 of the present invention.
The eccentric shaft comprises an outer eccentric body 1, a left shaft boss 11, a first shaft hole 12, a first inner step surface 2, an inner eccentric body 21, a second shaft hole 22, a first outer step surface 23, a convex ring 24, a first boss 25, a retainer ring 3, a right end cover 31, a third shaft hole 32, a pressing ring 33, a second boss 41, a first bearing 42, a second bearing 43, a support ring 5, a connecting shaft 51, a first spiral groove 52 and a first straight line groove.
Detailed Description
The invention will be described in detail with reference to the accompanying drawings.
Example 1:
as shown in fig. 3, an eccentric vibrator includes an outer eccentric body 1 and an inner eccentric body 2, the outer eccentric body 1 having an inner circumferential surface, the inner eccentric body 2 having an outer circumferential surface, and a first bearing 41 provided between the inner circumferential surface and the outer circumferential surface; the centers of gravity of the inner eccentric body 2 and the outer eccentric body 1 are both deviated from the centre of rotation formed by the first bearing 41; the outer eccentric body 1 is provided with a left pillow block 10 which is coaxial with the first bearing 41, and the left pillow block 10 is provided with a first shaft hole 11 which is coaxial with the first bearing 41; the inner eccentric body 2 is provided with a second shaft hole 21 which is coaxial with the first bearing 41; a right end cover 3 is arranged on the right sides of the outer eccentric body 1 and the inner eccentric body 2, and the right end cover 3 is tightly matched with the right side surface of the first bearing 41; the right end cover 3 is provided with a third shaft hole 31 which is coaxial with the first bearing 41. In order to enable the right end cover 3 to stably abut against the right side of the first bearing 41, the right end cover 3 is provided with a raised pressing ring 32, and the pressing ring 32 abuts against the right side of the outer ring of the first bearing 41. The right end cover 3 and the outer eccentric body 1 are fixedly connected by using a bolt or welding mode and the like.
In the eccentric oscillator provided by this embodiment, because the center of gravity of the inner eccentric body 2 and the center of gravity of the outer eccentric body 1 are both deviated from the center of rotation formed by the first bearing 41, and the inner eccentric body 2 is installed in the inner cavity of the outer eccentric body 1 through the first bearing 41, the inner eccentric body 2 can flexibly rotate in the outer eccentric body 1, and the excitation force can be adjusted by adjusting the included angle of the two eccentric bodies in rotation.
The centrifugal force calculation formulas of the outer eccentric body 1 and the inner eccentric body 2 are as follows:
F＝meω2。
wherein m is the mass of the rotating member, e is the radial direction of the mass center, and omega is the angular velocity of rotation.
Adjusting the included angle between the inner eccentric body and the outer eccentric body, as shown in fig. 4, when the inner eccentric body 2 is adjusted to be 0 degree with the outer eccentric body 1, that is, the diameter of the center of mass of the whole eccentric vibrator is 0, and the exciting force of the whole eccentric vibrator is 0. As shown in fig. 5, when the inner eccentricity is adjusted to 180 degrees from the outer eccentricity, the entire eccentric vibrator exciting force is F ═ m1e1 ω2+ m2e2 ω 2, where the excitation force of the entire eccentric vibrator reaches the maximum value.
Because the inner eccentric body 2 is installed in the inner cavity of the outer eccentric body 1 through the first bearing 41, and two eccentric body revolution surfaces of the eccentric vibrator are arranged on the same plane, the embodiment can realize that the size of the excitation force is adjusted to be zero so as to reduce the load of the vibration exciter when the vibration exciter is started.
As shown in fig. 3, in order to facilitate mounting and fixing the first bearing 41, the inner circumferential surface of the outer eccentric body 1 is provided with a first inner step surface 12 in a direction away from the axis, the outer circumferential surface of the inner eccentric body 2 is provided with a first outer step surface 22 in a direction close to the axis, the first inner step surface 12 and the first outer step surface 22 form a first step surface, and the left side surface of the first bearing 41 is located on the first step surface. In order to fix the inner ring of the first bearing 41, a retaining ring 25 is arranged on the outer circumferential surface of the inner eccentric body 2, and the retaining ring 25 is fixedly connected with the inner eccentric body 2 in a threaded or shrink-fitting manner.
Example 2:
as in embodiment 1, the difference is that, as shown in fig. 6, in the case of a relatively large-sized eccentric oscillator, a first bearing 41 and a second bearing 42 are provided between the outer eccentric body 1 and the inner eccentric body 2 in order to increase the stability between the outer eccentric body and the inner eccentric body of the eccentric oscillator. In order to facilitate installation and fixation, the inner circumferential surface of the outer eccentric body 1 is provided with a first inner step surface 12 in the direction away from the axis, the middle position of the outer circumferential surface of the inner eccentric body 2 is provided with a convex ring 23 in the direction away from the axis, a space for accommodating the first bearing 41 is formed between the left step surface of the convex ring 23 and the first inner step surface 12, and a space for accommodating the second bearing 42 is formed between the right step surface of the convex ring 23 and the pressing ring 32 of the right end cover 3. For better fixing the first bearing 41 and the second bearing 42, a support ring 43 is provided between the outer ring of the first bearing 41 and the outer ring of the second bearing 42.
Example 3:
the technical means for adjusting the exciting force of the eccentric vibrator can be any mode, and the scheme provided by the embodiment is as follows: on the basis of the scheme provided by the embodiment 2, as shown in fig. 7, the first shaft hole 11 of the left pillow block 10, the second shaft hole 21 of the inner eccentric body 2 and the third shaft hole 31 of the right end cover 3 are sequentially sleeved on the connecting shaft 5, the connecting shaft 5 is provided with a spiral groove 51, the inner wall of the second shaft hole 21 is provided with two first bosses 24, and the two first bosses 24 are arranged on a track line matched with the spiral groove 51; the connecting shaft 5 is provided with a first straight groove 52, the third shaft hole 31 is provided with two second bosses 33, and the two second bosses 33 are arranged on a track line matched with the first straight groove 52.
The motion process is as follows: promote connecting axle 5 moves left or right, drives first spiral groove 51 and first straight line recess 52 move left or right, drive second boss 24 is followed first spiral groove 51 rotates, because the first straight line recess 52 of connecting axle 5 with in the 3 third shaft holes 31 of right-hand member lid second boss 33 cooperation, connecting axle 5 with right-hand member lid 3 with outer eccentric body 1 keeps motionless on the circumferencial direction, has realized outer eccentric body 1 with the change of contained angle between two eccentric bodies of inner eccentric body 2 adjusts the dynamic adjustment of the exciting force of this eccentric oscillator according to this.
Example 4:
another scheme for adjusting the exciting force of the eccentric vibrator is as follows: a second spiral groove is formed in the inner wall of the second shaft hole 21; a second linear groove is formed in the inner wall of the third shaft hole 31; and two third bosses matched with the second spiral grooves and two fourth bosses matched with the second linear grooves are sequentially arranged on the connecting shaft 5 from left to right. The two third bosses are arranged on a track line matched with the second spiral groove; the two fourth bosses are arranged on a track line matched with the second straight line groove.
The motion process is as follows: the connecting shaft 5 is pushed to move leftwards or rightwards to drive the third boss and the fourth boss to move leftwards or rightwards to drive the second spiral groove to rotate, the connecting shaft 5, the right end cover 3 and the outer eccentric body 1 are kept immovable in the circumferential direction, the change of an included angle between the outer eccentric body 1 and the two eccentric bodies of the inner eccentric body 2 is realized, and the dynamic adjustment of the exciting force of the eccentric vibrator is adjusted accordingly.
Claims (11)
1. An eccentric vibrator comprising an outer eccentric body (1) and an inner eccentric body (2), the outer eccentric body (1) having an inner circumferential surface and the inner eccentric body (2) having an outer circumferential surface, characterized in that at least one first bearing (41) is provided between the inner circumferential surface and the outer circumferential surface; the centers of gravity of the inner eccentric body (2) and the outer eccentric body (1) are deviated from the centre of rotation formed by the first bearing (41); the outer eccentric body (1) is provided with a left pillow block (10) which is coaxial with the first bearing (41), and the left pillow block (10) is provided with a first shaft hole (11) which is coaxial with the first bearing (41); the inner eccentric body (2) is provided with a second shaft hole (21) which is coaxial with the first bearing (41); a right end cover (3) is arranged on the right sides of the outer eccentric body (1) and the inner eccentric body (2), and the right end cover (3) is tightly attached to the right side surface of the outer ring of the first bearing (41); the right end cover (3) is provided with a third shaft hole (31) which is coaxial with the first bearing (41).
2. The eccentric oscillator according to claim 1, wherein the right end cap (3) is provided with a raised press ring (32), the press ring (32) abuts against the right side of the outer ring of the first bearing (41), and the right end cap (3) is fixedly connected with the outer eccentric body (1).
3. The eccentric oscillator according to claim 2, wherein the inner circumferential surface of the outer eccentric body (1) is provided with a first inner step surface (12) in a direction away from the axial center, the outer circumferential surface of the inner eccentric body (2) is provided with a first outer step surface (22) in a direction close to the axial center, the first inner step surface (12) and the first outer step surface (22) form a first step surface, and the left side surfaces of the inner ring and the outer ring of the first bearing (41) are located on the first step surface.
4. The eccentric oscillator according to claim 3, characterized in that a collar (25) is arranged on the outer circumferential surface of the inner eccentric body (2), the collar (25) being fixedly connected to the inner eccentric body (2).
5. The eccentric oscillator according to claim 2, wherein a second bearing (42) is further disposed between the outer eccentric body (1) and the inner eccentric body (1), a first inner step surface (12) is disposed on the inner circumferential surface of the outer eccentric body (1) in a direction away from the axis, a convex ring (23) is disposed on the outer circumferential surface of the inner eccentric body (2) in a direction away from the axis, a space for accommodating the first bearing (41) is formed between the left step surface of the convex ring (23) and the first inner step surface (12), and a space for accommodating the second bearing (42) is formed between the right step surface of the convex ring (23) and the pressure ring (32) of the right end cap (3).
6. The eccentric oscillator according to claim 5, characterized in that a support ring (43) is provided between the first bearing (41) outer ring and the second bearing (42) outer ring.
7. The eccentric oscillator according to any of claims 1-6, wherein the first shaft hole (11) of the left pillow block (10), the second shaft hole (21) of the inner eccentric body (2) and the third shaft hole (31) of the right end cap (3) are sequentially sleeved on a connecting shaft (5), and the connecting part of the connecting shaft (5) and the second shaft hole (21) is provided with a spiral groove and boss matching structure; the connecting portion of the connecting shaft (5) and the third shaft hole (31) is provided with a linear groove and boss matching structure.
8. The eccentric oscillator according to claim 7, characterized in that a first spiral groove (51) and a first straight groove (52) are provided in this order from left to right on the connecting shaft (5); a first boss (24) matched with the first spiral groove (51) is arranged on the inner wall of the second shaft hole (21); and a second boss (33) matched with the first straight line groove (52) is arranged on the inner wall of the third shaft hole (31).
9. The eccentric oscillator according to claim 8, characterized in that at least two of the first bosses (24) are provided on a locus line which is engaged with the first spiral groove (51); at least two second bosses (33) are arranged on a track line matched with the first linear groove (52).
10. The eccentric oscillator according to claim 7, characterized in that the inner wall of the second shaft hole (21) is provided with a second spiral groove; a second linear groove is formed in the inner wall of the third shaft hole (31); and a third boss matched with the second spiral groove and a fourth boss matched with the second linear groove are sequentially arranged on the connecting shaft (5) from left to right.
11. The eccentric oscillator of claim 7, wherein at least two of the third bosses are disposed on a trace line engaged with the second spiral groove; and at least two fourth bosses are arranged on a track line matched with the second straight line groove.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910736058.5A CN111250380A (en) | 2019-08-09 | 2019-08-09 | Eccentric vibrator |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201910736058.5A CN111250380A (en) | 2019-08-09 | 2019-08-09 | Eccentric vibrator |
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| CN111250380A true CN111250380A (en) | 2020-06-09 |
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| CN201910736058.5A Pending CN111250380A (en) | 2019-08-09 | 2019-08-09 | Eccentric vibrator |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2021027559A1 (en) * | 2019-08-09 | 2021-02-18 | 济南豪特创新管理咨询合伙企业(有限合伙) | Eccentric vibrator |
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2019
- 2019-08-09 CN CN201910736058.5A patent/CN111250380A/en active Pending
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2021027559A1 (en) * | 2019-08-09 | 2021-02-18 | 济南豪特创新管理咨询合伙企业(有限合伙) | Eccentric vibrator |
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