JPH031068Y2 - - Google Patents

Description

[Detailed Description of the Invention] <Industrial Application Field> This invention relates to an improvement of a rocking device for a specific gravity sorter.

<Prior art> In a specific gravity sorter, which is installed in a liquid and feeds and sorts raw materials with different specific gravities onto a bed mesh surface that pulsates up and down, the pulsations with multiple amplitudes are more sensitive than the pulsations with only a single amplitude. is effective in improving the sorting effect. Therefore, conventionally, as shown in FIG. 4, a small eccentric high-speed rotating shaft 16 and a large eccentric low-speed rotating shaft 17 are arranged in parallel, and the rotation of each rotating shaft 16, 17 is transferred to the housing 18, 18a, 19, 19a into a rocking motion, and furthermore, the common cross arms 20, 2
0a, and the cross arms 20, 20a combine the two types of rocking motions to generate the journals 21, 20a.
The information was transmitted to the specific gravity sorting machine main body 15 via 21a.

<Problems to be solved by the invention> In the above configuration, rolling bearings are used for the bearings 22, 22a, 23, 23a interposed between the rotating shafts 16, 17 and the housings 18, 18a, 19, 19a. However, other bearings 24, 24 between the housing 18, 18a, 19, 19a and the cross arms 20, 20a
a, 25, 25a and cross arms 20, 20
Bearings 26, 26 between a and journals 21, 21a
Regarding a, a sliding bearing will have to be adopted. However, the large number of sliding bearings (six in total) tends to cause looseness, and when such looseness occurs, the oscillating motion generated on the high-speed rotating shaft 16 side with small eccentricity is absorbed and lost. The resulting pulsations appeared to have a single amplitude, and the drawback was that the expected improvement in screening effect was not achieved. In addition, there were other problems, such as early failure of the device due to bearing play, high maintenance costs due to the large number of parts, and the inability to downsize the device, which required a large installation area. .

<Means for solving the problem> This invention uses two rotating shafts with different rotational speeds and eccentricities, and the combined swinging motion of each swinging motion generated by the rotation of these two rotating shafts. By structuring the arms that transmit information to the sorting machine body side to be stacked on the outside in order, the number of bearings, especially the number of sliding bearings, is reduced, and the small amplitude high-speed pulsations that occur are absorbed and eliminated. In addition to eliminating the causes of
This makes it possible to downsize the device.

<Example> This invention will be explained below based on the drawings.

In FIG. 1, which shows an embodiment of this invention, a central shaft 1 having eccentric portions 2, 2a is rotatably supported by two bearings 3, 3a, and a pulley 4 attached to the end of the shaft is rotatably supported by two bearings 3, 3a. It is designed to rotate by rotating it using an appropriate power transmission means such as a V-belt. Bearings 5, 5a are attached to each eccentric portion 2, 2a of the central shaft 1, and these bearings 5, 5a allow a hollow shaft 6 forming an eccentric portion 7 to rotate freely outside the central shaft 1. Supported. hollow shaft 6
A pulley 8 is attached to the shaft end so as to be concentric with the bearings 5, 5a, and a suitable power transmission means such as a V-belt is used in the same manner as described for the pulley 4 of the central shaft 1. By turning it, the hollow shaft 6 is rotated. Usually, the central shaft 1 is a high-speed rotating shaft with a small amount of eccentricity, and the hollow shaft 6 is a low-speed rotating shaft with a large amount of eccentricity. In this case, the bearings 5, 5a can be smaller than in the opposite case. However, the opposite may be true. In addition, the rotation direction of the central shaft 1 and the hollow shaft 6 is determined from the viewpoint of life extension of the bearings 5 and 5a in which both the outer race and the inner race rotate.
It is preferable that the directions of rotation of the two rotational speeds 6 are made the same so that the actual number of rotations is reduced. However, if this point does not need to be taken into account, the rotation direction may be reversed.

A bearing 9 is attached to the eccentric portion 7 of the hollow shaft 6, and the arm 10 is rotatably supported by the bearing 9. The arm 10 is formed with a sliding bearing 11 having a hole into which a connecting pin 12 is fitted. The connecting pin 12 is attached to the journal 13 so as not to come off, and the journal 13 is connected to the specific gravity sorting machine main body 15 side.

Now, if different eccentric movements are generated by the rotation of both shafts 1 and 6, the combined eccentric movement of the two eccentric movements is transmitted to the arm 10 via the bearing 9, and from the arm 10 it is further transmitted to the connecting pin 12 and the journal 13. It will be transmitted to the specific gravity sorter main body 15 via.

In the example shown in FIG. 1 described above, the inner race of the bearing 9 is directly fitted onto the hollow shaft 6. On the other hand, the example shown in FIG. 3 differs from the example shown in FIG. 1 in that an eccentric ring 14 is provided. This eccentric ring 14 can be fixed as appropriate after being rotated by an arbitrary angle. In other words, means for adjusting the amount of eccentricity is added between the hollow shaft 6 and the bearing 9.

<Effect of the invention> As mentioned above, the central shaft 1 has different rotation speeds and eccentricities.
By adopting a structure in which the hollow shaft 6 and the arm 10 are stacked on the outside in order, the only place where a sliding bearing 11 has to be used is the bearing part for the connecting pin 12 formed on the arm 10, and the rest The bearings 3, 3a, 5, 5a, 9 can be rolling bearings. As a result, for example, if a small eccentric high-speed rocking motion is generated on the central shaft 1, this will not be absorbed and lost by the gap between the sliding bearings, and the pulsation of the composite amplitude will ensure the sorting effect. It can be improved. Moreover, it greatly contributes to miniaturization of the device, and does not require a large installation area.

Furthermore, when the eccentric ring 14 is provided, it is easy to adjust the amplitude to obtain pulsation that is appropriate for the raw material.

[Brief explanation of the drawing]

Fig. 1 is a sectional view showing the main parts of the rocking device of this invention, Fig. 2 is a longitudinal sectional view of Fig. 1, Fig. 3 is a longitudinal sectional view same as Fig. 2 showing another embodiment, FIG. 4 is a sectional view showing a conventional example. 1... Central axis, 2, 2a... Eccentric portion, 5, 5
a...Bearing, 6...Hollow shaft, 7...Eccentric part, 9
... Bearing, 10 ... Arm, 11 ... Sliding bearing, 12 ... Connection pin, 13 ... ... Journal,
14... Eccentric ring, 15... Specific gravity sorting machine body.

Claims (1)

[Claims for Utility Model Registration] 1. A rotatable hollow body whose rotation speed and eccentricity are different from that of the rotatable central shaft 1 through bearings 5, 5a attached to the eccentric portions 2, 2a of the rotatable central shaft 1. A shaft 6 is provided, and a sliding bearing 11 for the connecting pin 12 is installed via a bearing 9 attached to an eccentric portion 7 of the hollow shaft 6.
A rocking device for a specific gravity sorter, in which an arm 10 having a shape formed thereon is rotatably provided, and a connecting pin 12 is fixed to a journal 13 connected to a body 15 of the specific gravity sorter. 2. The rocking device for a specific gravity sorter according to claim 1, wherein the bearing 9 is rotatably attached to the outer periphery of the hollow shaft 6 via an eccentric ring 14 which can be fixed as appropriate. 3. The rocking device for a specific gravity sorter according to claim 1, wherein the central shaft 1 has a smaller eccentricity and higher speed than the hollow shaft 6. 4. The rocking device for a specific gravity sorter according to claim 1, wherein the rotation directions of both shafts 1 and 6 are the same.