JPS5934042A - Vibrating device - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention includes a drive device, a drive device coupled to the drive device, and
A rotating shaft supported by the casing via a bearing,
The present invention relates to a vibration excitation device including an eccentric unbalance member supported by the rotating shaft.

A wide variety of devices are used to make fluid substances easily flowable, to excite containers, etc. to empty their contents, or to excite mechanical devices such as conveyance devices. Excitation devices of the same type are known.

Vibratory devices of this type are also widely used, in particular for compacting building materials such as concrete.

As a vibration excitation device used for such a purpose, one is known that includes an electric motor and an unbalanced weight, each end of which is pivotally supported within a cylindrical casing.

In such vibration excitation devices, the rotating shaft of the unbalanced weight and the rotating shaft of the electric motor may be common, or both rotating shafts may be connected by a suitable joint. be.

In this type of vibrator, sometimes called a "vibrating bottle" or "internal vibrator," each part must be firmly attached, and the bearings are prone to wear. Therefore, bearings must be replaced periodically. Actually, it takes a lot of effort to assemble such a device! ll's labor is obscene.

The common characteristics of vibration devices using unbalanced weights are 4-contact,
The weight is fixed to the rotating shaft by using screws, clamps, or such a weight integrally formed with the rotating shaft. The centrifugal force generated by rotating the unbalanced weight is transmitted to the casing via the bearing, and vibrates the object as desired.

As described above, this type of vibration device has disadvantages because it is formed by fixing an unbalanced overlapping structure. That is, the bearing tends to wear out prematurely, and since the inner ring is tightly fitted to the rotating shaft, replacing the bearing is extremely difficult and complicated.

A pull-out tool is used for this purpose, but it is difficult to insert it between the weight and the bearing. Only when such a tool can be inserted between the weight and the bearing and engage the inner ring of the bearing can it be possible to remove the bearing and replace it.

In view of these points, the main object of the present invention is to improve the vibration exciter of the type described above and to facilitate its assembly.

According to the invention, this objective is achieved by loosely attaching the unbalanced member to the rotating shaft.

According to the prior art, it has been taken for granted that an eccentric weight or an unbalanced weight cannot be rotated unless it is fixed to a rotating shaft. Breaking away from this concept, the rotating shaft and unbalanced member are loosely connected. In contrast to known vibration excitation devices, in the vibration excitation device according to the invention the unbalanced member is not fixed to the rotation axis by force.

When the vibration excitation device according to the invention is in the inactive state, the asymmetrical member and the rotating shaft are not fixed to each other, but are in a mutually abutting manner.

When this vibration excitation device starts operating, that is, when the rotating shaft starts rotating, the unbalanced member first follows the rotating shaft with a certain delay due to its inertia force. The above-mentioned state of contact between the two members is a necessary requirement for generating frictional force between the two members.

As the rotational speed of the rotating shaft increases, the frictional force between both members increases, and the unbalanced member is accelerated. Experiments have shown that the desired excitation effect can be obtained even though the unbalanced member is loosely attached to the rotating shaft. If it is desired to replace the bearing, it can simply be pulled out of the rotating shaft with a loosely attached unbalanced member.

The vibration device based on the present invention can be applied to any drive type including electric, pneumatic, hydraulic, and others. The present invention can be suitably applied even if the vibration device is not of a type in which the rotation axis of the motor and the rotation axis of the vibration device body are common, such as a vibration device for compacting concrete. is possible. Two rotating shafts are connected to each other via a hard or flexible joint, a flexible rotating shaft is connected between both rotating shafts, or there is an arbitrary connection between both rotating shafts. The present invention is suitably applicable to a wide range of types of vibration excitation devices, including those connected via gaps of various sizes.

According to a preferred embodiment of the invention, the unbalanced member at least partially surrounds and abuts the axis of rotation. The unbalanced member can be attached to the rotating shaft, for example, by a member that surrounds the rotating shaft in the center or at another location with respect to the axial force direction. In this way, a large unbalanced mass, that is, a good vibration effect can be obtained, and the unbalanced member can be suitably attached to the rotating shaft.

According to another embodiment of the invention, the unbalanced member has a generally semi-cylindrical shape and is provided with a bearing box at each end thereof. This bearing box has a smaller mass than the unbalanced member and its function is simply to surround the rotation axis and achieve a surface or line contact.

When the vibration excitation device according to the invention is started, a small frictional force is generated in this contact area, as a result of which the unbalanced member starts to undergo a slight rotational movement. As a result, the side opposite to the part where the eccentric mass is present, such as the part of the bearing box surrounding the waist rotation shaft where centrifugal force is generated, comes to be strongly pressed against the rotation shaft. In this way, the entire unbalanced member is accelerated and its movement becomes synchronized with the movement of the axis of rotation.

Apart from this, the frictional force between the rotating shaft and the bearing box in contact with it gradually increases as the rotational speed of the unbalanced member increases and the centrifugal force increases in proportion to the square of the rotational speed.

However, when the rotating shaft rotates, it is often only the members surrounding the rotating shaft or the bearing box that generate friction force between the rotating shaft and the unbalanced member in order to cause the unbalanced member to follow it. stomach.

The frictional force between the rotating member and the unbalanced member is strong only in the rotating shaft, which rotates fully, and also causes the inner ring of the bearing to rotate. Depending on the configuration and posture of the vibration excitation device, other members may come into frictional contact as well, depending on contact, inclination, direction of weight, etc. This is due to the fact that they are used in different positions, as can be seen from the use of vibrating devices for emptying containers, vibrating bottles for pouring concrete, and the like. Typically, vibrating bottles are suspended vertically into concrete.

In the preferred embodiments described above, loosely mounting the unbalanced member on the rotating shaft allows the bearing box to engage the enclosure of the unbalanced member via the rotating shaft, or the unbalanced member to be attached to the bearings at both ends thereof. It is said that the device is attached to a rotating shaft using a box. The bearing box and other members surrounding the rotating shaft are fitted onto the rotating shaft with a suitable degree of fit. That is,
There is only a relatively small air gap between the rotating shaft and the bearing box.

For example, if the diameter of the rotating shaft of the vibration excitation device is 75 and the diameter is about 20 cylinders, and the rotating shaft is driven at a speed of about 200 revolutions per second, the above-mentioned gap between the rotating shaft and the bearing box is At the largest point, it can be made approximately 1/10th the capacity.

Preferred embodiments of the invention will now be described in detail with reference to the accompanying drawings. It is believed that this will make the objects, features, and effects of the present invention other than those described above clear.

The vibrating device shown in FIG. 1 is of a type suitable for compacting concrete, and its tip (1) is fixed to a casing (2) at the left end in the figure. At the right end in the figure, a stator (3) is attached, and when the vibration device is assembled and raised, its outer surface contacts the outer surface of the casing (2) without any gaps.

The rotor (4), which is integral with the rotating shaft (5), is located inside the casing (2) and the stator (3), also in the assembled state. The rotating shaft (5) is supported by the casing (2) via two bearings (6).

In other words, the base end (8) of the rotor (4) is mounted on another bearing (
9) and is pivotally supported by the stator (3). An unbalanced member, indicated in its entirety by the reference numeral (10), is loosely fitted on the rotating shaft (5) between the two bearings (6) (γ).

FIG. 2 shows how the unbalanced member (10) is fitted onto the rotating shaft (5).
is shown exaggerated.

The unbalanced member (10) has a semi-cylindrical shape obtained by cutting a cylinder along the axial direction. In addition, the inside is <:il-shaped inner surface 0 to receive rotation @ (5)
1).

In the perspective view of FIG. 1, the portion of the rotating shaft (5) fitted into the unbalanced member (10) is entirely surrounded by the bearing box (12) except for the portion surrounded by the bearing box (12). , one half is exposed. For this reason,
When the illustrated vibration exciter is placed horizontally, line contact is made between the rotating shaft (5) and the unbalanced member (10) at two locations, and the unbalanced member (10) It can be seen that the box is suspended from the rotating shaft (5) by its part. The part that makes this &l contact is indicated by the reference numeral (13) in FIG.

When the vibration excitation device is in operation, as the rotating shaft begins to rotate, the unbalanced member (10) first rotates slightly due to the line contact at the portion (1B), and due to the centrifugal force generated accordingly. , the unbalanced member (10
) will start to rotate more violently. The centrifugal force, which increases in proportion to the square of the rotational speed, increases the frictional force, and eventually the rotational speeds of the rotating shaft (5) and the unbalanced member (10) become synchronized.

In the above explanation, we did not specifically mention the fact that, for example, members such as bearings also apply accelerating force to unbalanced members due to frictional force, simply because the importance of item 7 is relatively small. It is.

The retaining ring 0 kalpa holds each part of the casing member (1)
(2) It functions to hold within (3).

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 shows a conc! using an unbalanced member according to the present invention! /-t'5 The second diagram of the vibration device for compaction is as follows:
FIG. 2 is a longitudinal cross-sectional view of the vibration excitation device of FIG. 1 taken along the front end surface of the unbalanced member. (1) Tip (2) Casing (3) Stator (4) Rotor (5) Rotating shaft
(6) (7) Bearing (8) Base end (
9) Bearing (10) Unbalanced member (11) Inner surface (12) Bearing box θB) part (14) Retaining ring (S) Air gap procedure amendment (method) January 18, 1980 Kazuo Wakasugi, Commissioner of the Japan Patent Office, 1. Display of the case 1982 Patent Application No. 143168 2, Title of the invention Vibration device 3 Person making the amendment Relationship in the case Patent applicant name: Igin Jeannetta

Claims (3)

[Claims] (1) A drive device, a rotating shaft connected to the drive device and pivotally supported by a casing via a bearing, and an eccentric unbalance member supported by the rotating shaft; Device, characterized in that - said unbalanced member (10) is loosely supported on said axis of rotation (5) K. (2) The device f5 according to claim 1, wherein the unbalanced member at least partially surrounds and abuts the rotating shaft. (3) Claim (1) is also characterized in that the unbalanced member has a generally semi-cylindrical shape and has a bearing box +12'(f) at each end thereof. Apparatus according to paragraph (2).