JPS6161898B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an improvement in a tumbler for smoothing the surface of a cast product.

The tumbler is used to remove sand adhering to the cast product and smooth the surface.A container containing an abrasive material called a star is rotated along with the cast product.
This is a device that smooths the surface of the cast product by rubbing it against abrasive particles such as stars and removed sand. However, in conventional devices of this type, the rotation of the container is based on simple rotational movement around the center of the container, so the number of times that the abrasive material such as a star comes into contact with the cast product in the container is small, and the impact force is is too weak to exert its full effect, and therefore a lot of time is required to give the cast product the desired texture. In addition, it is not possible to apply an abrasive material such as a star uniformly to the entire surface of the cast product.
As a result, "unevenness" was likely to occur in the finished product of the casting. The present invention solves these problems and provides a more improved tumbler.

Next, the configuration of the present invention will be explained using examples.
Reference numeral 1 denotes a machine base which fixes a bearing 2 and rotatably supports a rotating shaft 4 via the bearing 2. Further, the rotating shaft 4 includes an eccentric portion 3, and a container 8 is rotatably supported through the eccentric portion 3 via a bearing 5. The outer wall 9 of the container 8 is provided with a rotating ring 10 having an inner peripheral surface concentric with the bearing 5, and the machine base 1 is provided with a rotating ring 10 having an inner peripheral surface concentric with the bearing 5.
A fixed ring 11 having an outer circumferential surface slightly smaller than the inner circumferential surface of the fixed ring 11 is disposed. The fixed ring 11 is provided concentrically with the bearing 2, and the rotating ring 10 is configured such that the inner circumferential surface of the rotating ring 10 and the outer circumferential surface of the fixed ring 11 are always in contact at one point. Note that the amount of eccentricity of the eccentric portion 3 with respect to the rotating shaft 4 described above is the same value as one half of the difference between the inner diameter of the inner peripheral surface of the rotating ring 10 and the outer diameter of the fixed ring 11. When attaching an elastic body such as rubber to the circumferential surface and the outer circumferential surface of the fixed ring 11, the amount of eccentricity is set to be larger than the above value by the amount of deflection of the elastic body. Additionally, a balance weight 12 corresponding to the amount of unbalance is disposed on the rotating shaft 4 to reduce unnecessary vibrations to the machine base 1 and the device. Reference numerals 6 and 7 indicate supply and discharge ports provided in the container 8, which are used to input and discharge contents such as objects to be processed and stars (not shown). A closing lid 13 is provided, but the lid 13 is opened and closed by a hinge (not shown) to facilitate the supply and discharge of contents. Furthermore, in addition to attaching an elastic body such as rubber or resin to the inner circumferential surface of the rotating ring 10 and the outer circumferential surface of the stationary ring 11, grooves are arranged on both circumferential surfaces to increase the frictional resistance on both circumferential surfaces. ,
Furthermore, various design changes can be made, such as placing internal gears and external gears on both circumferential surfaces to completely eliminate slippage between the two circumferential surfaces. Note that 14 is an electric motor, and machine 1
The rotary shaft 4 is fixed to the rotary shaft 4 and is configured to rotate the rotary shaft 4. Further, reference numeral 15 denotes a cover, which protects the rotating shaft 4 that passes through the container 8 from the contents.The rotating shaft 4 is arranged separately at both ends of the container 8, and the rotating shaft 4 is transmitted and driven by another shaft. It is also possible to configure the two rotating shafts to rotate synchronously, in which case the cover 15 is unnecessary and the internal volume of the container 8 can be effectively utilized.

In the above configuration, the rotational motion transmitted by the electric motor 14 to the rotating shaft 4 supported by the bearing 2 fixed to the machine base 1 is transmitted to the eccentric part 3. As shown in FIG. The container 8 is rotatably supported on a shaft, and the center m of a rotating wheel 10 provided on the container 8 is eccentrically rotated about the center s of the rotating shaft 4. ring 11
Since the inner circumferential surface of the rotating ring 10 concentrically disposed on the eccentric portion 3 is in contact with a part of the outer circumferential surface of the Circumferential length of inner peripheral surface of ring 10 and fixed ring 11
_{differentially} rotates _by the difference in _the circumferential length of _the outer peripheral surface of A motion that combines vibration due to rotation or rocking and a speed reduction mechanism due to the differential rotation shown as the locus of the contact point a is generated. As a result, the container 8 equipped with the rotating wheel 10 is subjected to a rocking rotational movement accompanied by vibration,
It acts effectively on the contents inside the container 8. In other words, the objects to be processed and their contents, such as stars, undergo multiple motions that combine vibration and rocking in addition to rolling due to rotation, which significantly increases the number of times the abrasive materials such as stars come into contact with the objects to be processed, or collide with each other. In order to
Due to the contact friction and impact force, the surface of the object to be treated is uniformly polished, and sand and the like adhering to the object to be treated are removed very efficiently or the surface of the object to be treated is smoothed.

As detailed above, according to the present invention, rolling, vibration,
Due to the synergistic effect of the oscillations, the surface of the workpiece can be efficiently finished in a short period of time to produce a high-quality product with no unevenness and a smooth surface.The reduction mechanism has been greatly simplified, and the mechanism is simpler than before. The present invention is industrially useful, as it makes it possible to improve power transmission efficiency.

[Brief explanation of the drawing]

FIG. 1 is a sectional view of a main part showing an embodiment of the present invention, and FIG. 2 is an explanatory diagram of the movement of a rotary wheel 10 shown in the embodiment. In the figure, 1... Machine base, 2... Bearing, 3... Eccentric part,
4... Rotating shaft, 5... Bearing, 6, 7... Supply/discharge port, 8
...container, 9...outer wall, 10...rotating ring, 11...fixed ring.

Claims (1)

[Claims] 1 A rotating shaft 4 having an eccentric part 3 rotatably supported by a bearing 2 fixed to the machine base 1, and a supply/discharge shaft 4 having an eccentric part 3 rotatably supported through the eccentric part 3 via a bearing 5. A container 8 having outlets 6 and 7, a rotating ring 10 having an inner peripheral surface concentric with the bearing 5 provided on the outer wall 9 of the container 8 at a portion through which the rotating shaft 4 penetrates, and an inner peripheral surface of the rotating ring 10. It consists of a fixed ring 11 that is fixed to the machine base 1 and concentrically with a bearing 2 having a slightly smaller outer circumferential surface than the rotating ring 1.
A vibrating rotary tumbler characterized in that the inner circumferential surface of the fixed ring 11 is in contact with one point of the outer circumferential surface of the fixed ring 11.