CN210978170U - Eccentric shaft with balance block - Google Patents

Abstract

The utility model discloses an eccentric shaft with balancing piece, including an eccentric main shaft, be equipped with the eccentric inertia axle that is used for cup jointing link assembly at an eccentric main shaft terminal surface, the terminal surface that eccentric main shaft is equipped with eccentric inertia axle still is equipped with the balancing piece, when eccentric main shaft is static or rotate, the static balance focus A that the link assembly that the balancing piece cup jointed on and the eccentric inertia axle constitutes all within 5mm with the distance H in the eccentric main shaft centre of a circle. The utility model discloses an eccentricity D is 15-30mm, is applied to the numerical control cutting bed, can change the current not strong problem of equipment working ability because of the eccentricity is little. The utility model discloses install the balancing piece additional on eccentric main shaft, the combination power point of the link assembly and the balancing piece that cup joint on the eccentric inertia axle, static balance focus A is within 5mm all the time with the distance H in the eccentric main shaft centre of a circle promptly to eliminate most unbalanced force on the eccentric inertia axle, owing to the effect of centrifugal force inevitably causes vibrations and noise when reducing high-speed rotation.

Description

Eccentric shaft with balance block

Technical Field

The utility model relates to an axle type part technical field, specific saying so relates to an eccentric shaft with balancing piece, especially an eccentric shaft suitable for numerical control cutting bed cut-off knife power take off equipment.

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 performance of the cutting bed 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 of marking and verifying noise emission values of machines and equipment cannot be reached.

The utility model discloses when increasing eccentric distance, install the balancing piece additional on eccentric main shaft and can offset most unbalanced force, owing to the effect of centrifugal force inevitably causes vibrations and noise when reducing high-speed rotatory.

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 shaft with a balance weight.

In order to achieve the above purpose, the utility model adopts the following technical scheme:

an eccentric shaft with a balance block comprises an eccentric main shaft, wherein an eccentric inertia shaft used for being sleeved with a connecting rod assembly is arranged on one end face of the eccentric main shaft, and the balance block is further arranged on the end face, provided with the eccentric inertia shaft, of the eccentric main shaft.

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 scheme, when the eccentric main shaft is static or rotates, the distance H between the center of the eccentric main shaft and the static balance center of gravity formed by the balance block and the connecting rod assembly sleeved on the eccentric inertia shaft is within 5mm, wherein the static balance center of gravity a is the resultant force point of the center of gravity E of the connecting rod assembly sleeved on the eccentric inertia shaft and the center of gravity F of the balance block.

In the above technical scheme, when the eccentric main shaft is static or rotates, the distance H between the static balance gravity center formed by the balance block and the connecting rod assembly sleeved on the eccentric inertia shaft and the center of the eccentric main shaft is 0.5-3 mm

In the above technical solution, the balance weight is a fan-shaped balance weight.

In the above technical scheme, the eccentric main shaft is a linear spindle shaft or a stepped shaft.

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 install the balancing piece additional on eccentric main shaft, the link assembly that cup joints on the eccentric inertia axle and the resultant force point (static balance focus A promptly) of balancing piece and the distance H in the eccentric main shaft centre of a circle are within 5mm all the time to eliminate eccentric inertia epaxial most unbalanced force, because the effect of centrifugal force causes vibrations and noise when reducing high-speed rotation.

Drawings

Fig. 1 is a schematic structural view of the present invention;

fig. 2 is a side sectional view of the present invention;

FIG. 3 is a schematic structural view of an eccentric spindle;

fig. 4a is a schematic view of the position of the first balance center of gravity a when the present invention is in the first position state;

fig. 4b is a schematic diagram of the position of the first balance center of gravity a when the present invention is in the second position;

fig. 4c is a schematic diagram of the position of the first balance center of gravity a when the present invention is in the third position state;

fig. 4d is a schematic diagram of the position of the first balance center of gravity a when the present invention is in the fourth position state;

in fig. 4a to 4d, E represents the position of the center of gravity of the link assembly, F represents the position of the center of gravity of the balance weight, and a represents the position of the resultant center of gravity of the link assembly and the center of gravity of the balance weight;

h represents the distance between the static balance gravity center A and the center of the eccentric main shaft; 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; 2. an eccentric inertial shaft; 3. a connecting rod assembly; 4. a counterbalance; 5. 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 is suitable for a numerical control cutting bed cut-off knife power take-off's eccentric shaft adopts the utility model provides an eccentric shaft changes the rotary motion of motor into and promotes the piston and carry out reciprocal linear motion.

As shown in fig. 1 and 2, the utility model provides an eccentric shaft with a balance block, which comprises an eccentric main shaft 1, wherein an end face of the eccentric main shaft 1 is provided with an eccentric inertia shaft 2 for sleeving a connecting rod assembly 3, one end of the sleeving connecting rod assembly 3 is sleeved on the eccentric inertia shaft 2, and the other end pushes a piston 5 to do reciprocating linear motion; the eccentricity D between the eccentric main shaft 1 and the eccentric inertia shaft 2 is 15-30 mm. The end surface of the eccentric main shaft 1 provided with the eccentric inertia shaft 2 is also provided with a balance block 4;

when the eccentric main shaft 1 is static or rotates, the distance H between the static balance gravity center A formed by the balance block 4 and the connecting rod assembly 3 sleeved on the eccentric inertia shaft 2 and the center of the circle of the eccentric main shaft 1 is within 5mm, preferably, the distance H is 0.5-3 mm; wherein, the static balance gravity center A is the resultant force point of the gravity center E of the connecting rod assembly 3 and the gravity center F of the balance block 4 which are sleeved on the eccentric inertia shaft 2.

The utility model discloses in, balancing piece 4 is fan-shaped balancing weight, and the inferior cambered surface of fan-shaped balancing weight (the face that is close to fan-shaped centre of a circle) is close to eccentric inertia axle 2, and eccentric inertia axle 2 is kept away from to the excellent cambered surface of fan-shaped balancing weight (the face of keeping away from fan-shaped centre of a circle).

The utility model discloses in, eccentric main shaft 1 is straight line polished rod axle or step shaft. As shown in fig. 3, the eccentric main shaft 1 is a stepped shaft, a power input end of the eccentric main shaft 1 is in transmission connection with a power mechanism, the power mechanism is a servo motor, and a driving wheel arranged on an output shaft of the servo motor is in transmission connection with an eccentric main shaft wheel (not shown in the figure) arranged on the first shaft body 1.1; the end face of the power output end of the eccentric main shaft 1 is provided with the eccentric inertia shaft 2 and the balance block 4.

As shown in fig. 4a to 4d, in the rotation process of the eccentric main shaft 1, the balance weight 4 and the connecting rod assembly 3 sleeved on the eccentric inertia shaft 2 rotate with each other to form static balance (the distance between the center of gravity of the balance weight 4 and the connecting rod assembly 3 sleeved on the eccentric inertia shaft 2 and the center of the circle of the eccentric main shaft 1 is within 5 mm); the eccentric main shaft 1 rotates along with the eccentric inertia shaft, the gravity center of the connecting rod assembly 3 and the gravity center of the balance block 4 which are sleeved on the eccentric inertia shaft 2 are changed, and the distance H between the resultant force point (namely the static balance gravity center A) of the connecting rod assembly 3 and the balance block 4 which are sleeved on the eccentric inertia shaft 2 and the circle center of the eccentric main shaft 1 is always within 5mm, 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 utility model discloses in, the basis that sets up of eccentric distance:

will the utility model provides an eccentric shaft sets up different eccentricities, shakes and the noise experiment, obtains experimental data, as shown in Table 1:

TABLE 1 Effect of setting different eccentricity distances

As can be seen from Table 1, when the eccentric distance is greater than 32mm, the vibration value is as high as 0.123mm/s and the noise value is 95Db, 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 install the balancing piece additional on eccentric main shaft, 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 (6)

1. The eccentric shaft with the balance block is characterized by comprising an eccentric main shaft (1), wherein an eccentric inertia shaft (2) used for being sleeved with a connecting rod assembly (3) is arranged on one end face of the eccentric main shaft (1), and a balance block (4) is further arranged on the end face, provided with the eccentric inertia shaft (2), of the eccentric main shaft (1).

2. An eccentric shaft with a balancing mass according to claim 1, characterised in that the eccentricity (D) of the eccentric main shaft (1) from the eccentric inertia shaft (2) is 15-30 mm.

3. The eccentric shaft with the balance weight according to claim 1, wherein when the eccentric main shaft (1) is static or rotating, the distance H between the center of the circle of the eccentric main shaft (1) and the static balance center of gravity (A) formed by the balance weight (4) and the connecting rod assembly (3) sleeved on the eccentric inertia shaft (2) is within 5mm, wherein the static balance center of gravity (A) is the resultant force point of the center of gravity (E) of the connecting rod assembly (3) sleeved on the eccentric inertia shaft (2) and the center of gravity (F) of the balance weight (4).

4. The eccentric shaft with balance weight according to claim 3, characterized in that when the eccentric main shaft (1) is stationary or rotating, the distance H between the static balance center of gravity (A) formed by the balance weight (4) and the connecting rod assembly (3) sleeved on the eccentric inertia shaft (2) and the center of the eccentric main shaft (1) is 0.5-3 mm.

5. An eccentric shaft with a balancing mass according to claim 1, characterised in that the balancing mass (4) is a sector-shaped balancing mass.

6. An eccentric shaft with weights according to claim 1, characterized in that the eccentric main shaft (1) is a straight polished shaft or a stepped shaft.

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