JPS6022215B2 - How to make a balance ring - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for manufacturing a balance ring that is attached to a rotating body, such as a washing and dewatering tank of a fully automatic washing machine.

In conventional balancing rings, fresh concrete is poured into a trough-shaped annular case with an open top, and after the fresh concrete has solidified, an annular lid is attached to cover the top of the annular case.

With this conventional model, it was difficult to uniformly pour fresh concrete around the entire circumference of the annular case, so we created a balance ring with good rotational balance. However, when replacing a gutter-shaped annular case with an open top surface with a hollow one with a closed top surface, it is difficult to fill the case to the top with fresh concrete, which tends to create a space at the top, which may actually affect the rotational balance. It can make things worse. This invention aims to manufacture a balance ring with good rotational balance by uniformly filling a heavy object into a hollow bamboo body formed into an annular shape without any gaps.

Fig. 1 shows a fully automatic washing machine using a balance ring manufactured by the manufacturing method of the present invention, in which 1 shows the external dimensions of the washing machine, and 2 shows the external structure suspended and supported within the external cliff by a vibration isolator 3. A tank 4 is a washing and dehydrating tank rotatably provided in the outer tank, and a pulsator 5 is provided in the washing and dehydrating tank. Reference numeral 6 denotes a motor that connects the washing and dewatering tank 4 and the pulsator 5 via a clutch device and a transmission device 7.
and selectively drive the rotation. Reference numeral 8 denotes a balance ring attached to the open upper end of the washing and dehydrating tank 4, which forms an annular shape surrounding the rotational axis of the washing and dehydrating tank 4.

As shown in FIG. 2, the balance ring 8 consists of a hollow annular weight body 81 made by blow molding a synthetic resin material such as polypropylene, and a heavy object 82 filled in the weight body 81.

The body 81 has three recesses 81a on its outer periphery, and in the recesses 81a, an ear-like piece 81c having a fastening element insertion hole 81b for fixing the balance ring to the washing and dewatering tank 4 is integrated. Shape and prepare. The weight 82 of the balance ring, ie, the filler, is preferably a mixture of powdered stone raw material (calcined gypsum), which has better fluidity than fresh concrete, and Kagami construction waste sand dissolved in water.

In particular, the weight ratio of gypsum raw material, Zenizo waste sand, and water is 150:
A ratio of 100:160 is most preferable because it has good fluidity and high strength in a semi-solidified state and is difficult to crumble.
In order to fill the cliff body 81 with the liquid heavy substance blended as described above, as shown in FIG. body 8
1 is placed on a stand 9 in a tilted state, and the liquid heavy substance 82 in the container 10 is poured into the container 10 through the funnel-shaped pipe 11 from the injection port 81d.

In this inclined state, the body 81 is not completely filled, leaving a space 82a only near the injection port 81d, and left until it becomes semi-solidified. When the heavy object 82 becomes semi-solidified and no longer flows, even if the bonito body 81 is returned to the horizontal position as shown in FIG. 3b, the remaining portion 82a near the injection port 81d remains in the same shape. In this horizontal state, the liquid heavy material 82 is further poured into the remaining portion 82a. Thereafter, as shown in FIG. 3c, a polypropylene lid 83 is placed on the rib-like protrusion 81f provided around the injection port 81d, and pressure is applied and a high-frequency current is applied to the rib-like protrusion 61.
f is melted and the lid 83 is glued to the continuous body 81. In the completed state of the balance ring, the heavy object 82 is in a semi-solid state containing residual moisture, but the water also forms part of the total weight of the balance ring.

Outer tank 2 due to imbalance during rotation of washing and dewatering tank 4.
Even if it shakes, the heavy object 82 has sufficient strength so it will not collapse. Since the heavy object 82 is not visible from the outside, Zenizo waste sand, which is industrial waste, can be used. As described above, the present invention provides a method for collecting liquefied weight by holding a hollow annular body with the injection port provided on the machine surface in the direction of the central axis of the cliff face obliquely. The material is injected through the injection port, leaving only the area near the injection port, and filled into the body, and when the heavy material is semi-solidified, the bonito body is returned to the horizontal position, and the liquefied heavy material is poured into the remaining portion near the injection port. Since the injection port is then closed, there is no risk of air bubbles being trapped in the body when heavy objects are injected, and the heavy object can be filled uniformly into the body without any gaps, which improves rotational balance. It is possible to manufacture a balance ring with good quality.

[Brief explanation of the drawing]

Fig. 1 is a schematic sectional view of a fully automatic washing machine using a balance ring manufactured by the manufacturing method of the present invention, Fig. 2 is a perspective view with a part of the balance ring cut away, and Figs. 3 a, b, and c.
FIG. 2 is a cross-sectional view showing the process of manufacturing a balance ring. Explanation of numbering, 81: Sparrow body, 81d: Inlet, 82: Heavy object, 82a: Remaining part. Figure 1 Figure 2 Blinds Figure 3 (a) Figure 3 (Close) Figure 3 (C)

Claims (1)

[Scope of Claims] 1. In a balance ring that is attached to a rotating body and has an annular shape surrounding the rotational axis of the rotating body, a hollow housing formed in an annular shape is attached to an end surface of the housing in the direction of the rotational axis. The liquefied heavy material is injected from the inlet with the inlet tilted upward, and the liquefied heavy material is filled into the housing, leaving only the vicinity of the inlet, and the heavy material is semi-solidified. A method for manufacturing a balance ring, which comprises returning the casing horizontally, further injecting the liquefied heavy material into the remaining portion near the injection port, and then covering the injection port. 2. The method for manufacturing a balance ring according to claim 1, wherein the casing and the injection port lid are molded from a synthetic resin material and are welded together using a high frequency current.