CN211564177U - Eccentric balance mechanism - Google Patents
Eccentric balance mechanism Download PDFInfo
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- CN211564177U CN211564177U CN201922085662.4U CN201922085662U CN211564177U CN 211564177 U CN211564177 U CN 211564177U CN 201922085662 U CN201922085662 U CN 201922085662U CN 211564177 U CN211564177 U CN 211564177U
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Abstract
The utility model discloses an eccentric balance mechanism, including eccentric shaft and the stabilizer device that has the balancing piece, the stabilizer device is connected with the eccentric shaft transmission. The utility model discloses an eccentricity D is 15-30mm, is applied to the numerical control cutting bed, changes the rotary motion of motor into and promotes the piston and carry out reciprocating linear motion, can change the current not strong problem of production equipment working ability because of the eccentricity is little. The utility model discloses the setting has eccentric shaft and the stabilizer device of balancing piece, the stabilizer device is connected with the eccentric shaft transmission, the balancing piece is with the first balanced focus A that the link assembly that eccentric inertia epaxial cover was established constitutes and the balanced focus B's of second that the stabilizer device constitutes resultant force point, balance mechanism focus C is located eccentric main shaft center promptly, can eliminate because of being equipped with under the action of gravity of link assembly on the eccentric inertia axle, eccentric motion produces unbalanced force, thereby because the effect of centrifugal force inevitably leads to the fact vibrations and noise when reducing high-speed rotation.
Description
Technical Field
The utility model relates to an axle type part technical field, specific saying so relates to an eccentric balance mechanism.
Background
The numerical control cutting machine used in the market at present adopts an eccentric shaft body to convert the rotary motion of a motor into a mode of pushing a piston to perform reciprocating linear motion. In the prior art, the eccentric radius of an eccentric shaft body is less than or equal to 12.5mm, so that the working capacity of the whole equipment is not strong, the cutting of the equipment can be improved by increasing the eccentric distance, however, as the shaft is an eccentric mechanism and is attached with a heavy object, vibration and noise are inevitably caused by the action of centrifugal force during high-speed rotation, the larger the eccentric distance is, the more obvious the noise and vibration are, and the noise standard of GB/T14574-2000 numerical control cutting bed for marking and verifying noise emission values of machines and equipment cannot be reached.
The utility model discloses when increasing eccentric distance, set up balance mechanism on the eccentric shaft, can offset the gravity that is equipped with link assembly on the eccentric shaft, produce unbalanced force under eccentric motion, because the effect of centrifugal force inevitably causes vibrations and noise when reducing high-speed rotation.
SUMMERY OF THE UTILITY MODEL
In order to solve the problems in the prior art, an object of the present invention is to provide an eccentric balance mechanism.
In order to achieve the above purpose, the utility model adopts the following technical scheme:
an eccentric balancing mechanism comprises an eccentric shaft with a balancing block and a balancing wheel device, wherein the balancing wheel device is in transmission connection with the eccentric shaft.
In the above technical solution, the eccentric shaft includes an eccentric main shaft, an eccentric inertia shaft for sleeving the connecting rod assembly is provided at an end surface of a power output end of the eccentric main shaft, and the balance block is further provided at an end surface of the eccentric main shaft where the eccentric inertia shaft is provided;
the balance weight and the connecting rod assembly sleeved on the eccentric inertia shaft form a first balance gravity center A, when the eccentric main shaft is static or rotates, the resultant force point of a second balance gravity center B formed by the first balance gravity center A and the balance wheel device is a balance mechanism gravity center C, the balance mechanism gravity center C is located on the eccentric main shaft center, and the first balance gravity center A is the resultant force point of a connecting rod assembly gravity center E and a balance weight gravity center F.
In the technical scheme, the balance wheel device is in transmission connection with the eccentric main shaft and comprises two balance wheels, the two balance wheels are symmetrically arranged on the left side and the right side of the axial lead of the eccentric main shaft, and the two balance wheels are in transmission connection with an eccentric main shaft wheel arranged at the power output end of the eccentric main shaft; each balance wheel is provided with a balance wheel balancing weight, and the resultant gravity center point of the two balance wheel balancing weights is the second balance gravity center B of the balance wheel device.
In the technical scheme, the eccentricity D between the eccentric main shaft and the eccentric inertia shaft is 15-30 mm.
In the above technical solution, when the eccentric main shaft is stationary or rotating, a distance P between a first balance center of gravity a formed by the balance weight and the connecting rod assembly sleeved on the eccentric inertia shaft and a center of the eccentric main shaft is within 5mm, wherein the first balance center of gravity a is a resultant force point of a center of gravity E of the connecting rod assembly and a center of gravity F of the balance weight.
In the technical scheme, the two balance wheels have the same rotation direction, and the eccentric main shaft wheel and the balance wheels have opposite rotation directions.
In the technical scheme, each balance wheel is synchronously driven through one first tension wheel, and the two first tension wheels are also connected with the two balance wheels and one eccentric spindle wheel through synchronous belt drive.
In the above technical solution, the two balance wheels have opposite rotation directions, and the eccentric main shaft wheel has the same rotation direction as one of the balance wheels.
In the technical scheme, a second tensioning wheel is arranged above one of the balance wheels, and the second tensioning wheel, the two balance wheels and one eccentric spindle wheel are connected through a synchronous belt in a transmission manner.
Compared with the prior art, the beneficial effects of the utility model are that:
1. the utility model discloses an eccentricity D is 15-30mm, is applied to the numerical control cutting bed, changes the rotary motion of motor into and promotes the piston and carry out reciprocating linear motion, can change the current not strong problem of production equipment working ability because of the eccentricity is little.
2. The utility model discloses the setting has eccentric shaft and the stabilizer device of balancing piece, the stabilizer device is connected with the eccentric shaft transmission, the balancing piece is with the first balanced focus A that the link assembly that eccentric inertia epaxial cover was established constitutes and the balanced focus B's of second that the stabilizer device constitutes resultant force point, balance mechanism focus C is located eccentric main shaft center promptly, can eliminate because of being equipped with under the action of gravity of link assembly on the eccentric inertia axle, eccentric motion produces unbalanced force, thereby because the effect of centrifugal force inevitably leads to the fact vibrations and noise when reducing high-speed rotation.
Drawings
Fig. 1 is a schematic structural diagram of embodiment 1 of the present invention;
fig. 2 is a side sectional view of embodiment 2 of the present invention;
FIG. 3a is a schematic diagram showing the position of the first balance center of gravity A in the first position state according to embodiment 1;
FIG. 3b is a schematic diagram showing the position of the first balance center of gravity A in the second position state according to embodiment 1;
FIG. 3c is a schematic view showing the position of the first balance center of gravity A in the third position state according to embodiment 1;
FIG. 3d is a schematic view showing the position of the first balance center of gravity A in the fourth position state according to embodiment 1;
FIG. 4a is a schematic view showing the position of the center of gravity C of the balance mechanism in a first position state according to embodiment 1, wherein point A in the figure corresponds to point A in FIG. 3 a;
FIG. 4b is a schematic view showing the position of the center of gravity C of the balance mechanism in a second position state according to embodiment 1, wherein point A corresponds to FIG. 3 b;
FIG. 4C is a schematic view showing the position of the center of gravity C of the balance mechanism in a third position state according to embodiment 1, wherein point A in the figure corresponds to point 3C;
FIG. 4d is a schematic view showing the position of the center of gravity C of the balance mechanism in a fourth position state according to embodiment 1, wherein point A in the figure corresponds to point 3 d;
fig. 5 is a schematic structural diagram of embodiment 2 of the present invention;
FIG. 6a is a schematic diagram showing the position of the first balance center of gravity A in the first position state according to embodiment 2;
FIG. 6b is a schematic diagram showing the position of the first balance center of gravity A in the second position state according to embodiment 2;
FIG. 6c is a schematic view showing the position of the first balance center of gravity A in the third position state according to embodiment 2;
FIG. 6d is a schematic view showing the position of the first balance center of gravity A in the fourth position state according to embodiment 2;
FIG. 7a is a schematic view showing the position of the center of gravity C of the balance mechanism in a first position state according to embodiment 2, wherein point A corresponds to FIG. 6 a;
FIG. 7b is a schematic view showing the position of the center of gravity C of the balance mechanism in a second position state according to embodiment 2, wherein point A corresponds to FIG. 6 b;
FIG. 7C is a schematic view showing the position of the center of gravity C of the balance mechanism in a third position state according to embodiment 2, wherein point A corresponds to FIG. 6C;
FIG. 7d is a schematic view showing the position of the center of gravity C of the balance mechanism in a fourth position state according to embodiment 2, wherein point A corresponds to FIG. 6 d;
in fig. 3a to 3d and fig. 6a to 6d, E is the center of gravity of the connecting rod assembly, F is the center of gravity of the balance weight, a is the first center of gravity of the balance weight, i.e., the resultant force point of the connecting rod assembly and the balance weight, and P represents the distance between the first center of gravity a and the center of the eccentric spindle;
in fig. 4a to 4d and fig. 7a to 7d, H is the center of gravity of the balance wheel counter weight, B is the center of gravity of the two balance wheel counter weight, and C is the center of gravity of the balance mechanism, i.e., the resultant force point of the first center of gravity and the center of gravity of the two balance wheel counter weight;
d is an eccentricity which represents the axle center distance between the eccentric main shaft and the eccentric inertia shaft;
description of reference numerals:
1. an eccentric main shaft; 1.1, eccentric main shaft wheel; 2. an eccentric inertial shaft; 3. a connecting rod assembly; 4. a balance wheel device; 4.1, a balance wheel; 4.2, balancing weight of the balance wheel; 4.3, a first tensioning wheel; 4.4, a second tensioning wheel; 4.5, synchronous belts; 5. a counterbalance; 6. a main shaft supporting seat; 7. a piston.
Detailed Description
In order to make the technical means, the creation features, the achievement purposes and the functions of the present invention easy to understand and understand, how to implement the present invention is further explained below with reference to the accompanying drawings and the detailed description.
The utility model provides an eccentric balance mechanism, including eccentric shaft and the stabilizer device 4 that has balancing piece 5, stabilizer device 4 is connected with the eccentric shaft transmission.
The eccentric shaft comprises an eccentric main shaft 1, an eccentric inertia shaft 2 for sleeving a connecting rod assembly 3 is arranged on the end surface of the power output end of the eccentric main shaft 1, and the balance block 5 is also arranged on the end surface of the eccentric main shaft 1, which is provided with the eccentric inertia shaft 2; the eccentricity D between the eccentric main shaft 1 and the eccentric inertia shaft 2 is 15-30 mm.
The balance weight 5 and the connecting rod assembly 3 sleeved on the eccentric inertia shaft 2 form a first balance gravity center A, when the eccentric main shaft 1 is static or rotates, the resultant force point of a second balance gravity center B formed by the first balance gravity center A and the balance wheel device 4 is a balance mechanism gravity center C, the balance mechanism gravity center C is located on the center of the eccentric main shaft 1, meanwhile, the distance P between the first balance gravity center A and the center of the eccentric main shaft 1 is within 5mm, and the first balance gravity center A is the resultant force point of a connecting rod assembly gravity center E and a balance weight gravity center F.
The balance wheel device 4 is in transmission connection with the eccentric main shaft 1, the balance wheel device 4 comprises two balance wheels 4.1, the two balance wheels 4.1 are symmetrically arranged on the left side and the right side of the axial lead of the eccentric main shaft 1, and the two balance wheels 4.1 are in transmission connection with the eccentric main shaft wheel 1.1 arranged at the power output end of the eccentric main shaft 1; each balance wheel 4.1 is provided with a balance wheel balancing weight 4.2, and the resultant gravity center point of the two balance wheel balancing weights 4.2 is the second balance gravity center B of the balance wheel device 4.
Example 1
As shown in fig. 1 to 2, the present embodiment provides an eccentric balance mechanism, which includes an eccentric shaft having a balance weight 5 and a balance wheel device 4, wherein the balance wheel device 4 is drivingly connected with the eccentric shaft.
The eccentric shaft comprises an eccentric main shaft 1, the eccentric main shaft 1 is fixed on an eccentric main shaft supporting seat 6 through a bearing, and the power output end of the eccentric main shaft 1 is in transmission connection with a power mechanism (such as a servo motor); an eccentric inertia shaft 2 for sleeving a connecting rod assembly 3 is arranged on the end face of the power output end of the eccentric main shaft 1, one end of the sleeving connecting rod assembly 3 is sleeved on the eccentric inertia shaft 2, and the other end of the sleeving connecting rod assembly 3 pushes a piston 7 to do reciprocating linear motion; the end face of the eccentric main shaft 1 provided with the eccentric inertia shaft 2 is also provided with the balance block 5; the eccentricity D between the eccentric main shaft 1 and the eccentric inertia shaft 2 is 15-30 mm.
The balance weight 5 and the eccentric inertia shaft 2 are sleeved with the gravity center of the connecting rod assembly 3 to form a first balance gravity center A, when the eccentric main shaft 1 rotates, the resultant force point of a second balance gravity center B formed by the first balance gravity center A and the balance wheel device 4 is a balance mechanism gravity center C, the balance mechanism gravity center C is located on the center of the circle of the eccentric main shaft 1, and the first balance gravity center A is the resultant force point of a connecting rod assembly gravity center E and a balance weight gravity center F.
The balance wheel device 4 is in transmission connection with the eccentric main shaft 1, the balance wheel device 4 comprises two balance wheels 4.1, the two balance wheels 4.1 are symmetrically arranged on the left side and the right side of the axial lead of the eccentric main shaft 1, the two balance wheels 4.1 are arranged on one side, close to the power output end of the eccentric main shaft 1, of the main shaft supporting seat 6, and the two balance wheels 4.1 are in transmission connection with the eccentric main shaft wheel 1.1 arranged at the power output end of the eccentric main shaft 1; every 4.1's top all is equipped with a first tight pulley 4.3 that rises, and every 4.1 of stabilizer is equallyd divide and is do not passed through a corresponding first tight pulley 4.3 synchronous drive that rises with it, two first tight pulleys 4.3 that rise still with two 4.1 of stabilizer and one eccentric main shaft wheel 1.1 passes through hold-in range 4.5 transmission and connects, makes two 4.1's the turning to the same of stabilizer, eccentric main shaft wheel 1.1 turns to opposite with two 4.1's of stabilizer.
Each balance wheel 4.1 is provided with a balance wheel balancing weight 4.2, and the resultant force point of the gravity centers of the two balance wheel balancing weights 4.2 is the second balance gravity center B of the balance wheel device 4.
As shown in fig. 3a to 3d and fig. 4a to 4d, in the rotation process of the eccentric main shaft 1, the balance wheel device 4 and the balance mass 5 rotate with the eccentric main shaft to form dynamic balance, and as the eccentric main shaft 1 rotates, the barycenter (i.e. the first balance barycenter a) of the connecting rod assembly 3 and the balance mass 5 sleeved on the eccentric inertia shaft 2 and the second balance barycenter B of the balance wheel device 4 all change in position, but the resultant barycenter C of the second balance barycenter B formed by the first balance barycenter a and the balance wheel device 4 is always located on the center of the circle of the eccentric main shaft 1, so that most of unbalanced force on the eccentric inertia shaft is eliminated, and vibration and noise caused by the action of centrifugal force during high-speed rotation are reduced. The first balance gravity center A is a resultant force point of the gravity center E of the connecting rod assembly and the gravity center F of the balance block, namely a point A; the second balance center of gravity B is the resultant force point (i.e., the point of the line connecting the centers of gravity H) of the centers of gravity H of the two balance wheel weights 4.2.
Example 2
As shown in fig. 5, the present embodiment provides an eccentric balance mechanism, which includes an eccentric shaft having a balance weight 5 and a balance wheel device 4, wherein the balance wheel device 4 is drivingly connected to the eccentric shaft.
The eccentric shaft comprises an eccentric main shaft 1, the eccentric main shaft 1 is fixed on an eccentric main shaft supporting seat 6 through a bearing, and the power output end of the eccentric main shaft 1 is in transmission connection with a power mechanism (such as a servo motor); an eccentric inertia shaft 2 for sleeving a connecting rod assembly 3 is arranged on the end face of the power output end of the eccentric main shaft 1, one end of the sleeving connecting rod assembly 3 is sleeved on the eccentric inertia shaft 2, and the other end of the sleeving connecting rod assembly 3 pushes a piston 7 to do reciprocating linear motion; the end face of the eccentric main shaft 1 provided with the eccentric inertia shaft 2 is also provided with the balance block 5; the eccentricity D between the eccentric main shaft 1 and the eccentric inertia shaft 2 is 15-30 mm.
The balance weight 5 and the eccentric inertia shaft 2 are sleeved with the gravity center of the connecting rod assembly 3 to form a first balance gravity center A, when the eccentric main shaft 1 is static or rotates, the resultant force point of a second balance gravity center B formed by the first balance gravity center A and the balance wheel device 4 is a balance mechanism gravity center C, the balance mechanism gravity center C is located on the center of the eccentric main shaft 1, and the first balance gravity center A is the resultant force point of a connecting rod assembly gravity center E and a balance weight gravity center F.
The balance wheel device 4 is in transmission connection with the eccentric main shaft 1, the balance wheel device 4 comprises two balance wheels 4.1, the two balance wheels 4.1 are symmetrically arranged on the left side and the right side of the axial lead of the eccentric main shaft 1, the two balance wheels 4.1 are arranged on one side, close to the power output end of the eccentric main shaft 1, of the main shaft supporting seat 6, and the two balance wheels 4.1 are in transmission connection with the eccentric main shaft wheel 1.1 arranged at the power output end of the eccentric main shaft 1; a second tension wheel 4.4 is arranged above one of the balance wheels 4.1, the second tension wheel 4.4 is fixedly arranged on the spindle supporting seat 6, and the second tension wheel 4.4, the two balance wheels 4.1 and one eccentric spindle wheel 1.1 are in transmission connection through a synchronous belt 4.5, so that the two balance wheels 4.1 are opposite in steering, and the eccentric spindle wheel 1.1 and one of the balance wheels 4.1 are the same in steering.
Each balance wheel 4.1 is provided with a balance wheel balancing weight 4.2, and the gravity center of the two balance wheel balancing weights 4.2 is the second balance gravity center B of the balance wheel device 4.
As shown in fig. 6a to 6d and fig. 7a to 7d, in the rotation process of the eccentric main shaft 1, the balance wheel device 4 and the balance mass 5 rotate with the eccentric main shaft to form dynamic balance, as the eccentric main shaft 1 rotates, the gravity centers (i.e., the first balance gravity center a) of the link assembly 3 and the balance mass 5 sleeved on the eccentric inertia shaft 2 and the second balance gravity center B of the balance wheel device 4 both change in position, and the resultant gravity center point C of the second balance gravity center B formed by the first balance gravity center a and the balance wheel device 4 is always located on the center of the circle of the eccentric main shaft 1, so that most unbalanced forces on the eccentric inertia shaft are eliminated, and vibration and noise caused by the action of centrifugal force during high-speed rotation are reduced. The first balance gravity center A is a resultant force point of the gravity center E of the connecting rod assembly and the gravity center F of the balance block, namely a point A; the second balance center of gravity B is the resultant force point (i.e., the point of the line connecting the centers of gravity H) of the centers of gravity H of the two balance wheel weights 4.2.
The utility model discloses in, the basis that sets up of eccentric distance:
the eccentric shaft provided in example 1 was set to different eccentricity and subjected to vibration and noise tests to obtain test data as shown in table 1:
as can be seen from Table 1, when the eccentric distance is greater than 32mm, the vibration value is as high as 0.116mm/s and the noise value is 91Db, the noise of the numerical control cutting bed is less than or equal to 85 according to GB/T14574-2000 labeling and verification of noise emission values of machines and equipment, and the eccentric distance reaches the standard within 30 mm. Therefore, the utility model discloses the setting has the eccentric shaft and the stabilizer device of balancing piece, and the stabilizer device is connected with the eccentric shaft transmission, and the eccentric distance of eccentric shaft can set up to 15mm-30 mm.
Finally, it is noted that the above embodiments are only used for illustrating the technical solutions of the present invention and not for limiting, and although the present invention has been described in detail with reference to the preferred embodiments, those skilled in the art should understand that the technical solutions of the present invention can be modified or replaced by equivalents without departing from the spirit and scope of the technical solutions of the present invention, which should be covered by the claims of the present invention.
Claims (9)
1. An eccentric balancing mechanism is characterized by comprising an eccentric shaft with a balancing block (5) and a balancing wheel device (4), wherein the balancing wheel device (4) is in transmission connection with the eccentric shaft.
2. The eccentric balancing mechanism according to claim 1, wherein the eccentric shaft comprises an eccentric main shaft (1), an eccentric inertia shaft (2) for sleeving the connecting rod assembly (3) is arranged on the end surface of the power output end of the eccentric main shaft (1), and the balance weight (5) is further arranged on the end surface of the eccentric main shaft (1) provided with the eccentric inertia shaft (2);
the balance weight (5) and the connecting rod assembly (3) sleeved on the eccentric inertia shaft (2) form a first balance gravity center (A), when the eccentric main shaft (1) is static or rotates, a resultant force point of a second balance gravity center (B) formed by the first balance gravity center (A) and the balance wheel device (4) is a balance mechanism gravity center (C), and the balance mechanism gravity center (C) is located on the center of the circle of the eccentric main shaft (1).
3. The eccentric balance mechanism according to claim 2, wherein the balance wheel device (4) is in transmission connection with the eccentric main shaft (1), the balance wheel device (4) comprises two balance wheels (4.1), the two balance wheels (4.1) are symmetrically arranged at the left side and the right side of the axial lead of the eccentric main shaft (1), and the two balance wheels (4.1) are in transmission connection with the eccentric main shaft wheel (1.1) arranged at the power output end of the eccentric main shaft (1);
each balance wheel (4.1) is provided with a balance wheel balancing weight (4.2), and the resultant force point of the gravity centers of the two balance wheel balancing weights (4.2) is the second balance gravity center (B) of the balance wheel device (4).
4. An eccentric balance mechanism according to claim 2, characterized in that the eccentricity (D) of the eccentric main shaft (1) and the eccentric inertia shaft (2) is 15-30 mm.
5. The eccentric balance mechanism according to claim 2, wherein when the eccentric main shaft (1) is stationary or rotating, the distance (P) between the center of the eccentric main shaft (1) and a first balance center of gravity (a) formed by the balance weight (5) and the connecting rod assembly (3) sleeved on the eccentric inertia shaft (2) is within 5mm, wherein the first balance center of gravity (a) is the resultant force point of the center of gravity (E) of the connecting rod assembly and the center of gravity (F) of the balance weight.
6. An eccentric balancing mechanism according to claim 3, characterized in that the direction of rotation of the two balancing wheels (4.1) is the same and the direction of rotation of the eccentric main shaft wheel (1.1) is opposite to that of the balancing wheels (4.1).
7. An eccentric balancing mechanism according to claim 6, characterized in that each of the balancing wheels (4.1) is synchronously driven by a first tension wheel (4.3), and two first tension wheels (4.3) are also in transmission connection with two balancing wheels (4.1) and one eccentric main shaft wheel (1.1) through a synchronous belt (4.5).
8. An eccentric balancing mechanism according to claim 3, characterized in that the directions of rotation of the two balancing wheels (4.1) are opposite, and the eccentric main shaft wheel (1.1) is the same as the direction of rotation of one of the balancing wheels (4.1).
9. An eccentric balancing mechanism according to claim 8, characterized in that a second tension wheel (4.4) is arranged above one of the balancing wheels (4.1), and the second tension wheel (4.4), the two balancing wheels (4.1) and an eccentric main shaft wheel (1.1) are in transmission connection through a synchronous belt (4.5).
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201922085662.4U CN211564177U (en) | 2019-11-28 | 2019-11-28 | Eccentric balance mechanism |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201922085662.4U CN211564177U (en) | 2019-11-28 | 2019-11-28 | Eccentric balance mechanism |
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| CN211564177U true CN211564177U (en) | 2020-09-25 |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110860600A (en) * | 2019-11-28 | 2020-03-06 | 武汉科普易能科技有限公司 | Eccentric balance mechanism |
| CN110860600B (en) * | 2019-11-28 | 2024-07-09 | 武汉科普易能科技有限公司 | Eccentric balance mechanism |
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2019
- 2019-11-28 CN CN201922085662.4U patent/CN211564177U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110860600A (en) * | 2019-11-28 | 2020-03-06 | 武汉科普易能科技有限公司 | Eccentric balance mechanism |
| CN110860600B (en) * | 2019-11-28 | 2024-07-09 | 武汉科普易能科技有限公司 | Eccentric balance mechanism |
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