KR100913433B1 - Balance weight, manufacturing apparatus of balance weight and its manufacturing process - Google Patents

Abstract

The balance weight of the present invention is a balance weight mounted on a tub of a washing machine to reduce rotational vibration, and is formed by mixing steel slag and cement, and a plurality of bolting holes penetrating upper and lower surfaces so as to be mounted on the tub. It is provided, and has a concrete block having an outer circumferential surface of the arc shape and the molding molded insert to surround the outer circumferential surface of the concrete block.

Since the balance weight according to the present invention can reduce the volume, it is possible to increase the space utilization inside the washing machine. Since the molding part is formed by the insert molding, it is possible to minimize the occurrence of hygiene and safety problems of the worker.

Washing Machine, Tub, Balance Weight, Molding, Injection, Insert

Description

Balance weight and manufacturing apparatus of the balance weight and its manufacturing method {balance weight, manufacturing apparatus of balance weight and its manufacturing process}

The present invention relates to a balance weight, an apparatus for manufacturing a balance weight, and a method for manufacturing the balance weight, and more particularly, a balance weight having a sufficient weight even with a small volume, sanitary through insert molding, and minimizing the risk of safety accidents. And a manufacturing apparatus of the balance weight and a manufacturing method thereof.

In general, the washing machine is provided with a balance weight to prevent vibration of the washing tank caused by the imbalance of the laundry filled therein.

Conventional balance weights were cured directly from the cement formwork and completed. However, such a conventional balance weight has a very rough surface, which may injure the worker who handles it, and has a disadvantage of being fragile.

Therefore, there is a balance weight made by curing the concrete block inside the injected synthetic resin material to overcome such disadvantages. This balance weight is completed by curing by injecting cement or concrete mortar into the interior of the housing injected with a synthetic resin material. For this purpose, a concrete mortar inlet is formed at one side of the balance weight, and a plurality of bolt holes are formed at one side thereof. Therefore, if the balance weight is to be fixed to the tub, insert the fixing bolt into each bolt hole and fix it firmly to the tub of the washing machine. In particular, the bushing is inserted into the balance weight so that the fixing bolt can pass therethrough.

However, the balance weight by such a concrete block has the following disadvantages. The worker may have to touch the concrete with his hand, which may cause the worker's hygiene problem.Because air bubbles enter the inside of the housing, the concrete mortar may not be completely filled in the housing, and the balance weight may not reach the reference weight. Can be.

If the balance weight does not reach the reference weight, a bad decision is received because the inherent function of preventing vibration is not properly performed. In particular, due to the characteristics of the balance weight, these defective products cannot be recycled, so all of them must be disposed of separately. Will go through.

The present invention includes a steel slag, so that even if the volume is small enough, it is heavy enough, and its object is to provide a balance weight and a manufacturing apparatus of the balance weight and its manufacturing method is wrapped around the outer peripheral surface by a synthetic resin.

Another object of the present invention is to provide a balance weight and a balance weight manufacturing apparatus and a manufacturing method thereof, in which a concrete block including steel slag is positioned at the center of a synthetic resin so that weight imbalance does not occur.

The balance weight of the present invention for achieving the above object is a balance weight mounted on the tub of the washing machine to reduce the rotational vibration, is formed by mixing the steel slag and cement, the upper and lower surfaces to be mounted on the tub A plurality of penetrating holes are provided and provided with a concrete block having an arc-shaped outer circumferential surface and an insert molded molding to surround the outer circumferential surface of the concrete block.

A plurality of pin holes penetrated toward the concrete block are formed on the lower surface of the molding part, and a plurality of fixing holes penetrated toward the concrete block are formed on the side of the molding part and spaced apart at predetermined intervals along the edge of the molding part. It is preferable.

The apparatus for manufacturing a balance weight according to the present invention comprises a block compactor for compressing a mixture comprising steel slag and cement, a plurality of bolting holes penetrating the upper and lower surfaces, and manufacturing a concrete block having an outer circumferential surface of an arc shape; A dryer for drying and firing the concrete block manufactured by the block compactor, and for insert molding the dried concrete block, an upper mold and a cavity in which the concrete block can be mounted in combination with the upper mold. An injection mold including a lower mold forming a lower mold and a plurality of support pins protruding a predetermined length upwardly from the lower mold so that the concrete block is supported at a predetermined distance from the upper and lower surfaces of the cavity. Equipped.

The injection mold includes a plurality of anti-rotation members protruding from the lower mold so that the concrete blocks supported by the support pins are contacted at predetermined intervals along the sides of the concrete blocks to prevent the concrete blocks from rotating inside the cavity. It is desirable to.

According to the present invention, there is provided a method of manufacturing a balance weight, a material mixing step of forming a mixture including steel slag and cement, and a concrete block having a plurality of bolting holes penetrating the upper and lower surfaces by compression molding the mixed mixture. A block fabrication step, a firing step of drying and firing the concrete block, a mounting step of mounting the fired concrete block in a cavity of an injection mold for insert molding, and a synthetic resin to surround the outer circumferential surface of the concrete block. And a molding step of insert molding molten synthetic resin into the insert block, wherein the concrete block is disposed upward from the lower mold of the injection mold such that the upper and lower surfaces of the concrete block are spaced a predetermined distance from the inner circumferential surface of the cavity, respectively. Extended by a given distance It is not to be mounted on are preferable.

Since the balance weight according to the present invention manufactured by the manufacturing method can reduce the volume, it is possible to increase the space utilization inside the washing machine, and the molding part is formed by insert molding. You can minimize it.

Hereinafter, with reference to the accompanying drawings will be described in more detail the balance weight according to the present invention and its manufacturing apparatus and manufacturing method as follows.

1 is a perspective view showing a state in which the balance weight 10 is mounted on the tub 1 of the washing machine, and FIG. 2 is a partially cut perspective view showing the bottom surface of the balance weight 10 upward.
Referring to the drawings, the balance weight 10 according to the present invention is installed on the tub 1 of the washing machine to prevent rotational vibration, and the concrete block 11 and the outer peripheral surface of the concrete block 11 And a molding part 12 which is insert molded to wrap.

Concrete block 11 is produced by compression molding and drying in a drying chamber using a block compactor of a balance weight manufacturing apparatus which will be described later a mixture of steel slag and cement.

The concrete block 11 is formed in an arc shape, and a plurality of bolting holes 11a penetrating the upper and lower surfaces at predetermined intervals along the longitudinal direction are formed to be coupled to the tub 1 of the washing machine.

Steel slag is a good material that can produce a balance weight that is heavy enough to prevent vibrations that may occur due to unbalance of laundry during operation of the washing machine, even with a small volume, due to its high specific gravity. In addition, due to the addition of the steel slag it is possible to reduce the volume of the balance weight to increase the space utilization of the washing machine, it can be expected to reduce the size of the washing machine. In addition, steel slag causes environmental pollution, which can be recycled to produce balance weights together with cement, thereby reducing the environmental pollution.

The molding part 12 is a part surrounding the surface of the concrete block 11 with synthetic resin in order to smooth the surface of the rough concrete block 11.

The molding part 12 is formed by mounting the concrete block 11 inside the injection mold of the balance weight manufacturing apparatus described later, injecting the molten synthetic resin into the injection mold and molding the synthetic resin on the outer surface of the concrete block 11.

A plurality of pinholes 12a are formed in the lower surface of the molding part 12 from the outer circumferential surface of the molding part 12 toward the concrete block 11, and a plurality of fixing holes are also penetrated toward the concrete block 11 in the side surface. 12b are formed to be spaced apart from each other along the edge of the molding part 12.

The pinhole 12a and the fixing hole 12b are injection molded so that the concrete block 11 is spaced apart from the inner surface of the injection mold when insert molding is performed to form the molding part 12 on the outer surface of the concrete block 11. It is formed by a plurality of support pins and anti-rotation members protruding in the mold.

The plurality of support pins and the anti-rotation member support the concrete block 11 without movement in the injection mold, and allow the molten synthetic resin to be uniformly molded on the surface of the concrete block during insert molding. Therefore, the defective rate of the balance weight is reduced.

In addition, it is possible to reduce the amount of synthetic resin injected, it is also effective to reduce the production cost. The injection mold will be described in detail in the description of the apparatus for producing a balance weight described later.

It is preferable that the thickness of the molding part 12 is formed in the range of 1 mm-8 mm.

When the thickness of the molding part 12 is less than 1 mm, the molding part is likely to be damaged by cracking, and the molding part 12 may not sufficiently cover the rough surface of the concrete block so that the outer peripheral surface of the molding part has a rough surface like the concrete block. On the contrary, as the thickness of the molding part becomes thicker, the molding part offsets the rough surface of the concrete block, thereby making it possible to produce a balance weight of a smooth surface. However, when the thickness of the molding part is more than 8 mm, the effect of the molding part is not increased. Rather, it takes a long time to solidify during the molding of the molding part, which increases the production time of the product and the production cost of injecting a large amount of synthetic resin. There is a problem that is raised.

The apparatus for manufacturing a balance weight according to the present invention includes a block presser 20 and a block presser 20 for manufacturing a concrete block 11 by pressing a mortar mixed with steel slag and cement into a molding die 21 and pressing the mold. Concrete block 11 to form a drying chamber (not shown) for drying and sintering the compressed concrete block 11 by hot air, and a molding part 12 molded with synthetic resin on the outer surface of the dried concrete block 11. ) Is composed of an insert injection molding machine 30 having an upper / lower mold which can be mounted at a predetermined distance from the inner surface of the injection mold.

Referring to FIG. 3, the block presser 20 is a molding press 21 having a molding space having a shape corresponding to the shape of the concrete block 11 to be molded, and a mold press 21. Compression plate 22 for compressing the mortar and the hydraulic cylinder 23 for elevating the compression plate 22, the detailed description thereof will be omitted.

4, the bolting hole forming member 21a protrudes at a predetermined interval in order to form the bolting hole 11a of the concrete block 11 in the forming mold 21 of the block compactor 20. , The pressing plate 22 is formed with a hole (not shown) through which the bolting hole forming member passes.

In the drying room, a storage space for storing the concrete block 11 is formed therein, and a warm air fan for supplying hot air to the storage space is installed.

Referring to FIG. 5, the insert injection molding machine 30 includes the upper and lower molds 31 and 32 to be molded as a general injection molding machine, the hydraulic actuator 33 driving the upper and lower molds 31 and 32, and the combined upper and lower molds. It is composed of an injection part provided with an injection gun 34 for injecting molten synthetic resin into the cavity inside the lower mold, and a detailed description thereof will be omitted.

However, referring to FIG. 6, in order to mold the synthetic resin on the outer surface of the concrete block 11, the concrete block 11 has a lower mold such that the outer surface of the concrete block 11 is spaced a predetermined distance from the inner surface of the lower mold 32. A plurality of support pins 32a and a rotation preventing member 32b protrude from the inner bottom and side surfaces of the lower mold 32 so as to be mounted to the 32.

The manufacturing method of the balance weight according to the present invention will be described with reference to FIG.

1. Mortar manufacturing stage

First, a step of manufacturing mortar for manufacturing the concrete block 11 is performed.

Cement and steel slag for increasing the specific gravity of the balance weight are mixed at a predetermined ratio to prepare mortar. Of course, in order to improve the functionality of the concrete block in this step, it is also possible to produce mortar by adding sand or other additives (rust inhibitor, antifoaming agent, etc.).

2. Concrete block manufacturing stage

It is a step of manufacturing the concrete block 11 by compression molding the mortar prepared by the mortar manufacturing step. The concrete block 11 is formed in an arc shape, and is molded to form a bolting hole 11a penetrating the upper and lower surfaces at predetermined intervals along the longitudinal direction.

The compression molding of mortar is performed by the block presser 20 of the balance weight manufacturing apparatus mentioned later. That is, the mortar is injected into the molding die 21, the pressing plate 22 is driven by the hydraulic cylinder 23, and the mortar injected into the molding die 21 is pressed.

3. Concrete block firing step

Drying and firing the concrete block 11 formed by the concrete block manufacturing step. The concrete block 11 is heat-dried by hot air in the drying room (not shown) of the balance weight manufacturing apparatus mentioned later.

4. Concrete block mounting step

In order to mold the synthetic resin on the outer surface of the concrete block 11 fired in the concrete block firing step, it is a step of mounting on the injection mold inner cavity of the insert injection machine of the balance weight manufacturing apparatus described later.

An important task for wrapping the synthetic resin with a uniform thickness on the outer surface of the concrete block 11 is to mount the concrete block 11 to the lower mold 32 so that the outer surface of the concrete block 11 is spaced a predetermined distance from the inner surface of the injection mold. do. That is, the concrete block 11 is supported by the plurality of support pins 32a protruding from the inner bottom of the lower mold 32 and the anti-rotation member 32b protruding from the inner side of the lower mold 32 to move. It is mounted on the lower mold 32 without.

5. Concrete block molding step

When the concrete block 11 is mounted on the lower mold 32, the upper mold 31 is molded into the lower mold 32, and molten synthetic resin is injected into the cavity inside the molded injection mold to form the concrete block 11. Synthetic resin is molded on the outer surface.

When the molding part 12 is formed, synthetic resin is not molded on the outer surface of the concrete block 11 in contact with the support pin 32a and the anti-rotation member 32b, and thus, the pinhole 12a and the fixing part are fixed to the molding part 12. A large number of holes 12b are formed.

As such, when the molding part 12 is formed in the concrete block 11, the balance weight 10 obtained by taking out from the injection mold is obtained.

The embodiments of the present invention described above should not be construed as limiting the technical spirit of the present invention. The scope of protection of the present invention is limited only by the matters described in the claims, and those skilled in the art can change and change the technical idea of the present invention in various forms. Therefore, such improvements and modifications will fall within the protection scope of the present invention as long as it will be apparent to those skilled in the art.

1 is a perspective view illustrating a state in which an embodiment of a balance weight according to the present invention is mounted on a tub of a washing machine;

2 is a partially cut perspective view of the balance weight of FIG. 1, FIG.

Figure 3 is a side view showing a block compactor of the apparatus for producing a balance weight according to the present invention,

Figure 4 is a perspective view showing a part of the molding die of the block compactor of Figure 3,

5 is a side view showing an insert injection machine in the apparatus for manufacturing the balance weight of FIG.

Figure 6 is a perspective view showing a part of the injection mold of the insert injection molding machine of Figure 5,

7 is a block diagram showing a step of manufacturing a balance weight according to the present invention.

<Description of Symbols for Main Parts of Drawings>

1: Tub 10: Weight Balance

11: concrete block 12: molding part

12a: pinhole 12b: fixing hole

20: block pressing machine 30: insert injection machine

32: lower mold 32a: support pin

32b: anti-rotation member

Claims (6)

In the balance weight mounted on the tub of the washing machine to reduce the rotational vibration, A concrete block formed by mixing steel slag and cement and provided with a plurality of bolting holes penetrating upper and lower surfaces so as to be mounted to the tub, and having an outer circumferential surface of an arc shape; And a molding part molded to insert the outer circumferential surface of the concrete block. Balanced weights, characterized in that the lower surface of the molding portion is formed with a plurality of pin holes penetrating toward the concrete block. delete The method of claim 1, Balanced weights, characterized in that formed on the side of the molding portion spaced apart along the edge of the molding portion and a plurality of fixing holes penetrating toward the concrete block. A block compactor for compressing the mixture including the steel slag and cement to provide a plurality of bolting holes penetrating the upper and lower surfaces, and manufacturing a concrete block having an arc-shaped outer circumferential surface; A drying chamber for drying and firing the concrete block produced by the block compactor; Insert molding of the dried concrete block, the upper mold, the lower mold to form a cavity in which the upper mold and the concrete block can be mounted therein, and the concrete block is the cavity And an injection mold comprising a plurality of support pins formed to protrude a predetermined length upward on the lower mold so as to be supported at a predetermined distance from an upper surface and a lower surface of the inside. The method of claim 4, wherein The injection mold includes a plurality of anti-rotation members protruding from the lower mold so that the concrete blocks supported by the support pins are contacted at predetermined intervals along the sides of the concrete blocks to prevent the concrete blocks from rotating inside the cavity. The manufacturing apparatus of the balance weight characterized by the above-mentioned. A mortar manufacturing step of forming a mixture comprising steel slag and cement; A concrete block manufacturing step of manufacturing a concrete block having a plurality of bolting holes penetrating the upper and lower surfaces by compression molding the mixed mixture; A concrete block firing step of drying and firing the concrete block; A concrete block mounting step of mounting the fired concrete block in a cavity of an injection mold for insert molding; And And a concrete block molding step of insert molding molten synthetic resin into the cavity to surround the outer circumferential surface of the concrete block by inserting the molten synthetic resin into the cavity. In the concrete block mounting step, the concrete block is mounted to be supported by a support pin and an anti-rotation member protruding from the inner surface of the lower mold of the injection mold such that the upper and lower surfaces of the concrete block are spaced apart from the inner circumferential surface of the cavity by a predetermined distance, respectively. Method for producing a balance weight, characterized in that.

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