JPH0357003B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention relates to a balanced vibrating feeder that uses vibration to continuously and automatically feed workpieces such as materials and parts.

[Conventional technology and its problems]

In various production processes, feeders are used as a means to continuously and automatically supply workpieces such as materials and parts. Among these, vibration feeders are becoming increasingly important as production factories become unmanned and labor-saving. Particularly in automatic assembly systems, along with advances in assembly robot usage technology, there is an increasing demand for vibrating feeders with advanced functions such as multi-stage or multiplex feeders. . In order to put such a highly functional vibration feeder into practical use, it is necessary to have a more stable vibration system than that of conventional vibration feeders. A type vibration feeder has been developed.

However, although the series of balanced vibration feeders that have been developed and put into practical use have achieved their goals in terms of basic vibration characteristics and stability, there is still some theoretical knowledge and knowledge needed to manufacture and adjust them. The reality is that its widespread use is slow because it requires skill.

In other words, since a conventional vibration feeder supports an array of parts such as a bowl or a trough by an elastic support such as a leaf spring, it is represented by a vibration system model diagram with one degree of freedom. With this structure, reaction force is transmitted from the parts array such as the bowl or trough to the foundation via the elastic support. This may cause mutual interference between the vibrating feeders, which may also have an adverse effect on other equipment that is based on the same foundation.

As a countermeasure, if an elastic vibration isolator is installed at the bottom of the foundation, a vibration system with two degrees of freedom will be constructed, and the vibration amplitude will fluctuate due to the movement of the natural frequency, making it necessary to readjust the vibration feeder. There were problems such as.

In order to solve the above-mentioned problems with the vibration feeder, an excitation force that vibrates in opposite phases to each other is applied to the two component arrays supported by an elastic support from the foundation, thereby increasing the spring-penetrating properties of each component. If the natural frequencies of the mass system are adjusted to be equal, the total reaction force transmitted to the foundation becomes 0, and the vibrations no longer affect the outside. A vibration feeder having such a basic structure is called a balanced vibration feeder, and this configuration is represented by a vibration model diagram as shown in FIG.

In the vibration model diagram in Figure 1, 1 and 2 are parts arrays such as bowls or troughs, or one of them is a dummy used for the purpose of balancing vibrations, and parts arrays 1 and 2 have independent structures. and
In addition, at least one of the parts arrays 1 and 2 has a work transfer path.

Reference numerals 3 and 4 denote elastic supports having a spring function that support each of the parts array bodies 1 and 2 from the base 10, and the elastic supports 3 and 4 can vibrate in the direction of transport of the workpiece.

11 is an elastic vibration isolator provided at the bottom of the foundation 10, P
represents the vibrational excitation force applied to the component arrays 1 and 2.

This balanced vibration feeder constitutes a one-degree-of-freedom vibration system, but by installing an elastic vibration isolator 11 under the foundation 10, it becomes a two-degree-of-freedom vibration system, with two spring-consistent masses. If the natural frequencies of the system are close to each other, it can be practically treated as a one-degree-of-freedom system.

In FIG. 1, the mass of the component array 1 is m ₁ , the mass of the component array 2 is m ₂ , the mass of the foundation 10 is m ₃ , the spring constant of the elastic support 3 is k ₁ , and the spring constant of the elastic support 4 is k ₂ and the spring constant of the elastic vibration isolator 11 is k ₃ , the natural frequencies of each of m ₁ and m ₂ are
Since the spring constants k ₁ and _{k 2 are} adjusted to match the natural frequencies of m _{1 and} m ₂ as much as possible, this natural frequency is equal to the excitation frequency. Therefore, depending on the size of the inertial mass, the spring constants k ₁ and k ₂
must be adjusted to match the natural frequencies.

[Purpose of the invention]

Therefore, the present invention aims to simplify the design, manufacture, and adjustment of a balanced vibratory feeder by a simple method, without losing the basic vibration characteristics and stability necessary for a balanced vibratory feeder, and to add new advantages to the conventional balanced vibratory feeder. This solves all the problems of molded vibration feeders at once.

[Summary of the invention]

The present invention provides two elastic supports separate from the foundation.
In a balanced vibrating feeder that supports two parts arrays, an elastic body having a spring effect is coupled between the two parts arrays.

[Structure of the invention]

As shown in the vibration model diagram shown in FIG. 2, the balanced vibration feeder with coupled springs of the present invention separates two parts arrays 1 and 2 from a foundation 10 by means of elastic supports 3 and 4. It has a structure in which an elastic body 7 having a spring effect is coupled between the supporting component array 1 and a second component array 2 which is separate from the component array 1.

〔Example〕

This invention can be realized by adding an elastic body 7 having a spring effect to an ordinary balanced vibrating feeder and adjusting various constants, so it is basically an invention of the nature that can be easily implemented.

The structure of the balanced vibration feeder with coupled springs according to the present invention will be explained based on FIGS. 3 and 4.
The drawing is applied to a type of balanced vibrating feeder called a twin type in which two component array bodies 1 and 2 are arranged symmetrically above and below. Specifically, a support column 6 is attached to a foundation 10 by screws 20 , and insert the fixing jig 16 into the support column 6.
Fixing fittings 16 are fixed to column 6 with screws 12.

Mounting brackets 17 are attached to the upper and lower parts of the fixing bracket 16 that is integral with the column 6, and the upper and lower mounting brackets 17
A plurality of leaf springs 3 and 4 are extended in the radial direction, and the upper bowl 1 is integrally attached to the tip of the leaf spring 3, and the lower bowl 2 is integrally attached to the tip of the leaf spring 4 with screws 18, A work transfer path is provided in at least one of the upper bowl 1 and the lower bowl 2,
The leaf springs 3 and 4 are attached to the column 6 in an inclined manner and support the upper bowl 1 and the lower bowl 2 so as to be able to vibrate in the direction of transport of the workpiece.

One end of the elastic body 7 having a spring effect is attached to the upper bowl 1 supported by a leaf spring 3 via a mounting bracket 19, while the other end of the elastic body 7 is attached to the upper bowl 1 supported by a leaf spring 3. Mounting bracket 1 on supporting lower bowl 2
Between the upper bowl 1 and the lower bowl 2, which are attached via an elastic body 7 and arranged so as to be vibrationally balanced by an elastic body 7, a vibrating device 5 that vibrates in the opposite phase of both bowls 1 and 2 is installed. It is something to be installed.

The mounting bracket 19 that is fixed to the bowls 1 and 2 has screws 1
3, and the elastic body 7 fixed to the mounting bracket 19 is fixed with screws 14.
Furthermore, the vibration device 5 is composed of, for example, an electromagnet 8 attached to one of the bowls 1 and 2 and a suction iron plate 9 attached to the other. The bowls 1 and 2 are vibrated by a suction iron plate 9 so that they vibrate in opposite phase directions.

The elastic body 7 having a spring effect installed between the two bowls 1 and 2 is selected from plate springs, coil springs, plate springs, rubber, etc. Moreover, the installation position of the elastic body 7 is the bowl 1,
2 or near the support column 6, or the vibration excitation device 5
Even if it is installed using the electromagnet 8 and suction iron plate 9, the vibration is the same, but in the case of a bowl feeder,
Mounting it on the outside has a larger torque spring constant and is also advantageous in terms of space. A similar thing can be said about the installation position of the excitation electromagnet 8.

〔Effect of the invention〕

In the balanced vibration feeder with coupled springs according to the present invention, the spring constants of the elastic supports 3 and 4 are k ₁ and k ₂
If the spring constant of the elastic body 7 installed between the two parts arrays 1 and 2 is k ₀ , then the equilibrium natural frequency of the vibration system is determined by k ₀ , k ₁ , and k ₂ , and now k ₁ ,
If k ₀ is made more than three times larger than k ₂ , then
Since the natural frequency is mostly dominated by k ₀ , it has the characteristic of not being influenced by k ₁ and k ₂ . Therefore, the equilibrium natural frequency of the vibration system only needs to be adjusted by adjusting k ₀ , which greatly facilitates design and manufacturing adjustment.

Since the functions of the spring constants k ₀ and k ₁ and k ₂ are different in this way, the function of regulating the vibration direction and the function of determining the spring constant can be separated and assigned to each. For example, the role of regulating the direction of vibration can be given to the elastic supports 3 and 4, such as leaf springs with spring constants k ₁ and k ₂ , which can be installed inside the bowl with a relatively small spring constant.

The elastic body that determines the spring constant is not limited to leaf springs, and coil-shaped or ring-shaped springs can also be selected and used as desired. This has the effect of making adjustment easier and increasing the torque spring constant. Furthermore, various combinations can be considered regarding the division of functions between the elastic support and the elastic body, and their types and shapes.

Note that if there is a difference in the natural frequencies of the two component arrays, vibration reaction force will be transmitted to the foundation even with a balanced vibration feeder, but the transmission rate is higher in the balanced vibration feeder of the present invention with coupled springs. It has the advantage of being extremely small. This greatly facilitates the manufacture and adjustment of the balanced vibratory feeder.

[Brief explanation of drawings]

Figure 1 is a vibration model diagram of a conventional balanced vibration feeder, Figure 2 is a model diagram of a balanced vibration feeder with a coupled spring according to the present invention, and Figure 3 is a diagram of a balanced vibration feeder with a coupled spring according to the present invention. FIG. 4 shows a partially cutaway front view showing the structure of the main part, and FIG. 4 shows a side view thereof. 1, 2... Part alignment body, 3, 4... Elastic support body,
5... Vibration device, 6... Column, 7... Elastic body,
8... Vibration electromagnet, 9... Attraction iron plate, 10...
Foundation, 11...Elastic vibration isolator, 12, 13, 14,
18, 20...Screw, 15, 17, 19...Mounting metal fittings, 16...Fixing metal fittings, P...Excitation force.

Claims (1)

[Scope of Claims] 1. A component array body 1 is supported by an elastic support 3 from a foundation 10, while a separate second component array body 2 is supported by another elastic support 4, and both components A work transfer path is provided in at least one of the aligned parts, the elastic support allows both parts aligned bodies to vibrate in one direction with respect to the work, and between the parts aligned body 1 and the second parts aligned body 2, An elastic body 7 having a spring constant k 0 larger than the spring constants k ₁ and k ₂ of the elastic supports 3 and ₄ is connected, and an excitation device 5 is attached to which both parts aligned bodies vibrate with opposite phases. Balanced vibratory feeder with built-in spring. 2. Claims in which the two parts array bodies 1 and 2 are each bowls, and at least one of the elastic body 7 connected between the two bowls and the elastic support bodies 3 and 4 that support both the bowls is a plate-shaped spring. A bowl hopper type balanced vibration feeder having a coupled spring according to item 1. 3. Claims in which the two parts arrays 1 and 2 are each troughs, and at least one of the elastic body 7 connected between the two troughs and the elastic supports 3 and 4 that support both the troughs is a plate-shaped spring. A linear balanced vibration feeder having a coupled spring according to item 1. 4. A balance having a coupled spring according to claim 1, 2, or 3, in which one of the two component arrays 1 and 2 is a dummy for vibrationally balancing the other. Type vibration feeder. 5 The vibration device 5 is composed of an electromagnet 8 and a suction iron plate 9, and the electromagnet is connected to the component alignment body 1 and the second component alignment body 2.
A balanced vibrating feeder having a coupled spring according to claim 1, 2, 3, or 4, wherein a suction iron plate is attached to one side of the feeder and a suction iron plate is attached to the other side.