KR20040068731A - Vibration Dampering System of Conveyor - Google Patents

Abstract

PURPOSE: A vibration dampening system of a vibration apparatus is provided to efficiently restrict the mechanical vibration, generated by the deceleration or the acceleration of a linear motor of the linear motor type vibration conveyor, from being transmitted to a lower structure of the vibration conveyor. CONSTITUTION: In a vibration apparatus comprising a lower structure, a linear motor(10), a trap(20), and a vibration dampening system, the vibration dampening system comprises a rack(50) installed to an upper plane of a lower structure(40); a pinion(52) which has at least one eccentric shaft(51), is engaged with the rack, and is connected to the lower part of the linear motor divided into a motor(11) and a stator(12), so that supporting the trap and the linear motor by rotating on the rack; and a fixing bracket(53) coupling the pinion to the linear motor on the eccentric shaft.

Description

Vibration Dampering System of Conveyor

The present invention relates to a vibration suppression system of a vibration machine including a vibration conveyor to which a linear motor is applied. More particularly, the present invention relates to a vibration vibration device for conveying a medium such as a vibration conveyor or a vibration feeder. The present invention relates to a vibration suppression system of a vibrating machine for stably blocking mechanical vibrations from being transmitted to the substructure.

Vibration machines such as vibration conveyors and vibration feeders use linear motors, rotary vibration motors or magnetic electromagnets to transfer goods from one location to another, such as minerals, earth and sand, and parts transfer in automated lines, or ceramic powder, It is a kind of transfer device for supplying a certain amount of powder such as fuel particles per hour. Such a vibrating device should be designed to cause vibration only in necessary parts and to be damped in order to suppress the conveyance of the medium or mechanical vibration in other areas, and for such damping, vibration damping is mostly performed using a damping spring or an air spring.

Vibration conveyors using linear motors, which have been recently developed, also apply vibration suppression systems using these springs, but vibration suppression of supporting structures is difficult with vibration suppression using such springs. That is, the responsiveness to the vibration in the downward direction can be greatly improved by the reaction force of the spring, but there is a problem of mechanical weakness and wear or defects because of the significant vertical movement of the upper structure.

As such, the vibration machine generally uses a linear motor, a rotary vibration motor, or a magnetic electromagnet to transfer minerals or earth and sand from one location to another, or to supply a certain amount of powder such as ceramic powder and abrasive particles per hour. As a type of type conveying apparatus, there is typically a horizontal vibration type linear motor-type vibration conveyor.

The horizontal vibration type linear motor vibration conveyor is a vibration damping system that prevents the vibration of the linear motor 10, the trap 20 for conveying the material, and the linear motor 10 to the substructure as shown in FIG. 30, the linear motor itself is composed of a motor unit 11 and a stator 12 to be a base unit.

The linear motor 10 periodically excites the motor 11 or the stator 12 with respect to the speed profile with respect to the stator 12, which is the base of the linear motor, with different acceleration and deceleration times. The medium in the trap 20 which is mounted on the upper part of the motor unit 11 or the stator 12 is excited.

The vibration conveyor system structure using the linear motor 10 can be largely divided into four parts. The lower structure 40 corresponding to the lowermost lower frame, the vibration suppression system 30 for reducing vibration of the upper excitation system, the linear motor 10 for vibration excitation, the medium installed on the upper part of the motor part of the upper excitation system Consists of the transfer trap 20 and the upper structure for supporting it.

The vibration suppression system 30 includes wheels 32 positioned between four concave jigs 31 and concave jigs 31 installed between the substructure 40 and the linear motor 10, which are main frames, as shown in FIG. It consists of a trolley | bogie 33 etc. which support a wheel.

Figure 3 (a) shows the details of the concave jig type vibration suppression system 30, Figure 3 (b) shows the curvature relationship of the concave jig to experimentally obtain the curvature value to maximize the concave jig effect Indicated. Here, D is the curvature height of the concave jig 31, L is the maximum distance of the concave jig curvature, θd is the diameter of the wheel 32, R is the circumferential outer diameter of the concave jig 31.

4 schematically shows a linear motor 10 system.

The linear motor type vibration conveyor system adjusts the acceleration / deceleration time of the motor with respect to the stator 12 of the linear motor 10 so that the medium on the vibration conveyor system chute to be mounted on the upper part of the motor can move. The biggest problem of such a system is that the greater the thrust of the linear motor, the greater the difference in acceleration and deceleration, the greater the vibration of the lower portion 13 on which the stator (base) of the linear motor is mounted.

In some cases, the whole system may be moved by vibration, and the vibration may be a factor that affects machines installed in other places.

The method of compensating for this is to block the mechanical vibration generated by the acceleration and deceleration of the linear motor 10 from being transmitted to the substructure, and to maximize the thrust of the linear motor which is a vibration element for smooth transportation of the medium. Thrust linear motor.

To this end, a damping spring is installed between the stator part (base part) and the lower structure 40 to use spring elasticity, or in the case of a linear motor vibration conveyor, a vibration reducing device using a concave hemispherical jig and a spherical wheel as shown in FIG. It was configured separately.

In FIG. 3, the hemisphere concave jig 31, which is a curved jig having a constant curvature fixed to the upper jig, and the wheel 32 having a predetermined diameter that moves under the concave jig 31, which is curved jig, are in contact with each other.

In this case, when the motor part 11 is operated with respect to the stator 12, reaction force acts in the direction opposite to the operation direction of the motor, and by this reaction force, the overall height of the upper structure including the motor 11 and the stator 12 is increased. The motion is caused, but the vibration suppression system 30 composed of the concave jig 31 and the wheel 32 causes the wheel to return to the lowest point of the concave jig 31 for system stability. That is, the vibration of the upper structure is suppressed from being transmitted to the lower structure by absorbing energy to be transmitted to the structure in the height direction and then returning it to its original position by gravity.

When applying these methods to a vibration conveyor, when using a coil spring or a leaf spring between the upper structure and the lower structure, or when applying a vibration reducing device using a hemispherical concave jig 31 and a spherical wheel 32 as shown in FIG. Can be This structure is configured to contact a hemispherical concave jig having a constant curvature fixed to the upper jig and a wheel 32 of a certain diameter moving in a curved jig, in the case of Figure 3 more stable damping force than the method using a spring Performance. However, this vibration suppression system has a fatal disadvantage that the height of the trap is changed by causing the vertical movement.

Thus, the conventional vibration suppression system applied to the vibration machine for vibration reduction is divided into spring type and concave jig method. However, it is difficult to suppress vibration of the supporting structure by damping using spring, and in case of concave jig, It did not show stable vibration damping performance due to height change.

In addition, the processing of the concave jig not only takes a high cost, but also generates a vertical change of the trap, resulting in a change in height, which does not stably induce a conveying state of the medium in the vibration conveyor and has a problem of unstable transfer.

Accordingly, it is an object of the present invention to provide a vibration suppression system that effectively blocks mechanical vibrations generated by acceleration and deceleration of a linear motor from a linear motor vibration conveyor so as not to be transmitted to the substructure.

Another object of the present invention is to enable manual vibration suppression while enabling a vibration suppression system design of a linear motor vibratory conveyor at low cost.

Still another object of the present invention is to allow the use of racks and pinions that are commercially available without additional processing, while controlling the damping effect according to the deviation between the rotation center and the shape center of the rotating wheel.

Vibration damping system according to the present invention for achieving this object is,

A lower structure corresponding to the main frame supported on the floor as the lowermost part, a linear motor having an upper conveying trap, a trap carried by the linear motor to convey a material, and a trap for reducing vibration between the trap and the structure. In a linear motor vibration conveyor having a vibration suppression system,

The vibration suppression system,

A rack installed on an upper plane of the substructure;

A pinion engaged with the rack and engaged with the upper side and coupled with the lower side of the linear motor divided into a motor and a stator, and having one or more eccentric shafts formed to support the trap and the linear motor while rotating along the rack as a whole;

It characterized in that the pinion is made of a fixing bracket for coupling the linear motor on the eccentric shaft.

By installing an eccentric wheel that rotates with an eccentric shaft between the upper structure and the lower structure of the linear motor vibratory conveyor, it is possible to design the vibration damping system of the vibration conveyor at low cost, and also to passively damp the vibration center. The damping effect can be adjusted according to the deviation between the center of the shape, and the rack and pinion, which are commercially available as ready-made products, can be used, so the application compatibility is large.

1 is a schematic view showing the configuration of a linear motor vibrating conveyor

2 is a conventional vibration suppression system configured in a linear motor vibrating conveyor

Figure 3 shows the main components of the conventional vibration suppression system

(a) details the concave jig vibration suppression system,

(b) shows the detail of curvature relation of concave jig

4 is a schematic view of a linear motor system;

Figure 5 is a one-cycle drive profile of the mechanical vibration generated by the acceleration and deceleration of the linear motor in the linear motor vibration conveyor

6 is a configuration diagram of a vibration suppression system applied to a linear motor vibration conveyor according to the present invention

7 is a view showing in detail the main portion of the vibration suppression system according to the present invention;

8 is a view for explaining the relationship between the rotation radius and the restoring force of the pinion which is the eccentric wheel according to the present invention

9 is a view showing an example of the eccentric shaft machining of the pinion for the design of the eccentric wheel according to the present invention

* Description of the symbols for the main parts of the drawings *

10: linear motor 11: motor part

12: Stator 20: Trap

30: vibration suppression system 40: substructure

50: rack 51: eccentric shaft

52: Pinion 53: Bracket

Hereinafter, an embodiment of the present invention will be described with reference to the drawings.

5 is a cycle reference diagram for explaining the driving profile of the mechanical vibration generated by the acceleration and deceleration of the linear motor in the linear motor vibration conveyor for reference. 6 is a configuration diagram of a vibration suppression system applied to a linear motor vibration conveyor according to the present invention. Figure 7 shows the main part of the vibration suppression system according to the present invention in detail. 8 is a view for explaining the relationship between the rotation radius and the restoring force of the pinion which is the eccentric wheel according to the present invention. Figure 9 shows an example of the eccentric shaft machining of the pinion for the design of the eccentric wheel according to the present invention.

The present invention is configured as shown in Figure 6 to prevent the vibration generated by the acceleration and deceleration of the drive unit of the motor in a vibrating device such as a vibration conveyor to which the linear motor is applied to the lower structure.

That is, the lower structure 40 corresponding to the main frame supported at the bottom as the lowermost portion, the linear motor 10 having the upper side conveying trap 20, and the linear motor 10 is excited by the linear motor 10 to convey the material And a vibration suppression system 30 for reducing vibration between the trap 20 and the trap 20 and the substructure 40.

The vibration suppression system 30 according to the present invention includes a rack 50 installed on an upper plane of the lower structure 40, a motor 11 and a stator 12 engaged with the rack 50 and being excited to an upper side thereof. One or more eccentric shafts 51 are formed to be coupled to the lower side of the linear motor 10, which is divided into a plurality, to support the trap 20 and the linear motor 10 while rotating along the rack 50. 52 and a fixing bracket 53 for coupling the pinion 52 to the linear motor 10 on the eccentric shaft 51.

Here, the positions of the motor 11 and the stator 12 constituting the linear motor 10 may be changed. In addition, the weight of the stator 12 is configured to be heavier than the weight of the motor 11, which is an excitation part. In addition, the eccentric shaft 51 is drilled into a plurality of pinions 52 to be used in various ways.

Effects of the present invention configured as described above are as follows.

In order to analyze the configuration of the present invention, the mechanical vibration generated by the acceleration and deceleration of the linear motor in the linear motor vibration conveyor will be described with reference to the driving profile of the linear motor of FIG. 5.

The duty ratio of the linear motor applied to the vibration conveyor is defined as the ratio of the acceleration time to the deceleration time.

The frequency is determined by the ratio of completion time (sec) to one cycle when the motor is in normal reciprocation, and is expressed in cpm (cycle per minute multiplied by 60 (sec)). That is, it can be expressed by the following formula.

freq = 60 / (acceleration time + deceleration time) cpm ------------------ (Equation 1-1)

Given the acceleration time, deceleration time, and speed, the amplitude S is determined by the following equation (1-2) assuming that there is no constant velocity section, which is a characteristic of the vibration conveyor.

S (mm) = 0.5 × (Acceleration time + Acceleration time) × Feeding speed (mm / s) --- (Equation 1-2)

In the vibration conveyor using the linear motor 10, the basic vibration source comes from the linear motor itself. And the transfer of the medium is affected by the acceleration and deceleration behavior of the motor 11 on the basis of the stator 12 of the linear motor. In other words, during rapid acceleration of the motor, the trap 20 mounted on the motor is accelerated at the same time and the medium on the trap slides and moves. At the time of deceleration, the deceleration time is delayed, so that the friction force between the medium and the trap surface is greatly acted and the medium does not move or moves backwards. As the operation is repeated, the medium is transferred. In other words, by appropriately changing the acceleration and deceleration time it is possible to adjust the feed rate of the medium. Therefore, it can be seen that the performance of the vibration conveyor is determined by the characteristics of the static and dynamic thrust of the linear motor 10. In addition, in order to utilize the characteristics of the linear motor 100%, the trap 20 mounted on the motor and the motor to be moved, and the lighter the medium weight of the trap, the better the performance.

In order to know this, the linear motor vibration conveyor was sampled and tested as follows.

The linear thrust force of the linear motor has a force of up to 2,000 N, and the mass of the drive part of the motor is 60 kg, the base part of the motor is 250 kg, and the mass of the chute or trap to be installed on the drive part of the motor can be varied up to 40 kg. It was. In addition, the experiment was performed in the light state as possible, and the result of the experiment was allowed to move except for the variable weight.

In this case, the weight of the driving part and the chute of the motor is close to the mass of the base part of the motor. During acceleration and deceleration of the motor, the base part and the motor driving part move in opposite directions according to the principle of action reaction. Will not. That is, the stator 12 serving as the lower base does not move as much as possible, and only the driving unit of the upper motor 11 performs the acceleration / deceleration movement so that the medium on the trap (suit) can move. However, no matter how strong the stator 12 becomes the lower base, the vibration generated by the acceleration and deceleration of the driving unit of the motor 11 is inevitably transmitted to the lower structure 40. Therefore, it is necessary to prevent the vibration generated by the acceleration and deceleration of the motor to be transmitted to the substructure.

According to the necessity, the vibration reduction device is configured to prevent vibration from being transmitted to the substructure by using a hemispherical concave jig and a spherical wheel as described above.

The vibration damping system 30 configured according to the present invention has a rack 50 installed on the upper plane of the lower structure 40, meshes with the rack 50, is engaged with the motor 11, and the upper side thereof. One or more eccentric shafts 51 are coupled to the lower side of the linear motor 10 divided by the stator 12 to support the trap 20 and the linear motor 10 while rotating along the rack 50 as a whole. The pinion 52 was formed, and the pinion 52 was coupled to the linear motor 10 side and the fixing bracket 53 on the eccentric shaft 51.

The positions of the motor 11 and the stator 12 constituting the linear motor 10 can be changed according to the configuration of the entire vibration conveyor.

The weight of the stator 12 is heavier than the weight of the motor 11, which is an excitation part, so that it is stable to vibration and is advantageous in stabilizing dynamic movement of the motor.

The eccentric shaft 51 of the pinion 52 coupled to the linear motor part side can be changed to change the rotation radius of the pinion 52 in consideration of the movement characteristics of the trap 20 flowing on the substructure 40. It is advantageous to drill several pieces.

The pinion 52 serves as an eccentric wheel while being located between the upper trap 20 and the undercarriage 40. The pinion 52 which becomes the eccentric wheel is in a stable state when the eccentric shaft 51 and the bottom surface are at a minimum distance. That is, when the eccentric wheel rotates to R 'as shown in FIG. 8, the restoring force is generated in a direction in which the distance between the eccentric shaft 51 and the sea surface is minimized, and this action is a condition in which gravity (F = Mg) is applied to the eccentric wheel. Repeat until it stabilizes.

When there is a vibration generated by the acceleration and deceleration of the motor according to the dynamic movement of the pinion 52 and the vibration movement of the vibration to the upper trap 20, the pinion 52 is repeatedly rotated along the rack 50. Cancel out the vibrations that appear continuously.

As described above, the present invention enables the design of a vibration suppression system of a vibration machine such as a vibration conveyor at low cost by installing an eccentric wheel made of a pinion that rotates with an eccentric shaft between the upper structure and the lower structure of a vibration machine such as a linear motor vibration conveyor. It works. In addition, passive vibration suppression is possible, and the vibration damping effect can be adjusted according to the deviation between the rotational center of the rotating wheel and the center of the shape. The rack and pinion, which are commercially available as ready-made products, can be used, and the application compatibility is also great.

Claims (4)

A lower structure corresponding to the main frame supported on the floor as the lowermost part, a linear motor having an upper conveying trap, a trap carried by the linear motor to convey a material, and a vibration reduction between the trap and the structure. In a vibrator having a vibration damping system, The vibration suppression system, A rack installed on an upper plane of the substructure; A pinion engaged with the rack and engaged with the upper side and coupled with the lower side of the linear motor divided into a motor and a stator, and having one or more eccentric shafts formed to support the trap and the linear motor while rotating along the rack as a whole; And a fixing bracket for coupling the pinion with the linear motor on the eccentric shaft. The method of claim 1, The weight of the stator is a vibration damping system of the vibration device, characterized in that configured to be heavier than the weight of the motor portion to be an excitation. The method of claim 1, The eccentric shaft is a vibration suppression system of the vibration device, characterized in that formed by drilling a plurality of eccentric holes of different positions in one pinion. The method of claim 1, And a pinion which becomes an eccentric wheel according to the excitation of the linear motor so that the eccentric shaft and the bottom surface are kept at a stable state from vibration when the eccentric shaft and the bottom surface are at a minimum distance.