JP2012030538A - Method of manufacturing circular floating ball, and circular floating ball - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a method of manufacturing a circular floating ball and the circular floating ball, which is used at a flushing toilet, comprising plastic hollow molded bodies.SOLUTION: In the method of manufacturing the circular floating ball 1 by bonding two plastic half-divided molded bodies 3, a tubular through-hole 41 is provided in the center, a flange 42 vertically extending is provided at the outer periphery, and a bonding resin filling groove 43 is provided in the entire outer central periphery of the vertical flange 42, further, a bonding resin injection path 44 for connecting the bonding resin filling groove 43 and the tubular through-hole 41 is provided, a middle plate 4 for enabling the outer surface of the flange 42 and the inner surface of the tubular through-hole 41 to be fitted to the inner surface of the plastic half-divided molded bodies 3 is arranged inside of the two plastic half-divided molded bodies 3, an outer peripheral bonding part 31 of both of the half-divided molded bodies 3 and the bonding resin filling groove 43 of the middle plate 4 are fit to correspond, each other, and melting bonding resin is filled from a circular center hole 2, and cured after arranging in the mold, and mold-clamping.

Description

  The present invention relates to a float used in a flush water tank of a flush toilet, etc., for controlling the opening and closing of a flush water discharge valve and adjusting the supply amount of flush water.

  In the flush water tank of the flush toilet, a constant amount of water is always stored using a ball tap, and the operation valve connected to the drain valve is pulled up to open the flush water drain valve at the bottom of the tank and store the flushed water. Is configured to supply toilets. In this case, instead of discharging the entire amount of stored water, a floating ball is connected to the discharge valve, and the buoyancy of this floating ball is used to control the opening and closing of the discharge valve and adjust the supply amount of washing water. Things are also done. This adjustment is performed by finely balancing the buoyancy of the floating ball, the weight of the discharge valve, the water level in the tank, and the distance between the floating ball and the discharge valve. Therefore, in this application that is used in a limited space and requires constant buoyancy at all times, the shape of the floating ball used has strict dimensional accuracy in terms of thickness, volume, outer shape, etc. In addition to being required, it is also required that deformation of the shape is small with respect to external force such as water pressure and temperature change. Furthermore, in order to control the moving direction and moving distance associated with the fluctuation of the water level of the floating ball, an annular floating ball is used, and a chain or a guide rod can be passed through the central hole in the center of the ring. .

  Common float balls are made of plastic hollow molded products, and such hollow molded products are often manufactured by blow molding, and the float balls used by being connected to the above-described ball taps are produced by blow molding. Many. However, in applications where shape accuracy is required, such as floating balls used in the above applications, blow molded products cannot ensure accuracy due to non-uniform thickness or the occurrence of residual burrs. The injection molding which can obtain the excellent molded product is adopted. In order to manufacture a hollow molded product by injection molding, each half molded product divided into two hollow molded products is injection molded, and each half molded product is abutted to form a temporary joined body, and the joined joint is melted. In addition to fusing and welding with a welding rod, a method of injecting a molten resin into a joint and joining them is performed. However, even if the half-formed product is manufactured with high precision by injection molding, the joining part is heated during the joining, and this part is deformed, and the dimensional accuracy of the hollow molded product is often impaired. Therefore, in applications where shape accuracy is required, it has been limited to those having a large thickness in order to avoid deformation of the hollow molded article to be produced.

  Cavities formed by the two halved molded bodies after being clamped in a state in which the two halved molded bodies are butted together in order to prevent such deformation of the joint portion when joining the half molded bodies. There has been proposed a method in which a fluid pressure is applied inside and molten resin is injected into the outer periphery of the joined joint portion while maintaining the pressurized state (see Patent Document 1). In this method, since the internal cavity of the hollow molded product is in a pressurized state, there is an advantage that the molten resin can be prevented from flowing into the inside and the joining portion from being deformed.

  However, in this method, in order to maintain the internal pressurized state, it is necessary that the butt portion of the half-formed product can be finished and sealed with high accuracy. If this sealing is insufficient, it is difficult to maintain the pressurized state, and even if the pressurized fluid is continuously supplied and the internal pressurized state is maintained, the influence of the pressurized fluid leaking from the butt portion Thus, the joint portion cannot be completely embedded and joined with the molten resin, and pinholes are often generated. Such pinholes are not suitable for use as floating balls.

Japanese Examined Patent Publication No. 6-73875

  An object of the present invention is to produce an annular floating ball made of a plastic hollow molded body having a shape accuracy capable of precisely controlling buoyancy, which is used for controlling the opening / closing of a discharge valve of a flush water tank of a flush toilet. It is to provide a method and an annular float.

The method for producing an annular floating ball according to the present invention includes:
In the method of joining and manufacturing two plastic halved molded parts divided by a halved surface orthogonal to the central hole,
A tubular through-hole is installed in the center, a flange projecting in both the upper and lower directions on the outer periphery, and a bonding resin filling groove on the outer center of the upper and lower flanges. Further, the bonding resin filling groove and the tubular A bonding resin injection path that connects the through hole is installed, and the outer surface of the flange and the inner surface of the tubular through hole are an intermediate plate that can be fitted to the inner surface of the plastic halved molded body,
Placed inside two plastic halves,
After fitting so that the outer peripheral joint part of both halved molded bodies and the joining resin filling groove of the intermediate plate match, after placing in the mold and clamping,
Fill the melt-bonded resin from the central hole into the bonded resin injection path, the bonded resin-filled groove, and the joint part of both halved molded bodies, and then cure the filled resin,
The halved molded body and the intermediate plate are joined together.

  That is, in the method for producing an annular floating ball according to the present invention, two plastic half-molded bodies that have been molded in advance by injection molding are temporarily bonded in a mold, and then a bonding resin is applied to the inner surface of the bonded portion. The resin is injected from the inside of the annular floating ball via the bonding resin injection path of the intermediate plate and cured.

  Further, it is preferable that two bonding resin injection paths installed on the intermediate plate are installed along the diameter of the intermediate plate.

The annular floating ball according to the present invention is
A tubular through hole is installed in the center, a flange projecting in both the vertical direction and a bonding resin filling groove on the outer center of the upper and lower flanges are installed on the outer periphery, and the bonding resin filling groove and the tubular penetration are further provided. A bonding resin injection path that connects the holes, and the outer surface of the flange and the inner surface of the tubular through-hole are an intermediate plate that can be fitted to the inner surface of the plastic half-molded body,
Arranged inside two plastic halved molded parts divided by a half face perpendicular to the central hole,
It is fitted so that the outer periphery joint part of both the half-molded bodies and the joining resin filling groove of the intermediate plate match.
And, the bonding resin is filled and cured in the bonding resin injection path, the bonding resin filling groove, and the joint portion of both halved molded bodies,
It is an annular floating ball in which both the half-formed product and the intermediate plate are joined and joined.

  In the manufacturing method of the present invention, since the joining resin is injected and cured on the inner surface of the joint portion of the two plastic half-molded bodies fitted and clamped in the mold, the joint portion, particularly the outer surface is completely The two halved molded bodies can be reliably bonded without being deformed. Then, the amount of the bonding resin to be injected is regulated by the bonding resin filling groove and the bonding resin injection path of the intermediate plate arranged inside the both halved molded bodies and becomes constant. Therefore, the operation management of the manufacturing is easy, and the annular floating ball created by this method can secure the shape and constant weight maintaining the precise dimensional accuracy of the pre-molded halved molded body. It becomes a suitable thing as a floating ball used for control of the discharge valve of the washing water.

  Further, even if the plastic half-molded product is as thin as 1.5 mm or less, it can be produced without deformation, and the amount of resin used can be reduced. In the annular floating ball according to the present invention, the joint portion of the two plastic half-molded bodies is filled with a uniform joining resin over the entire circumference and cured and firmly joined. In addition, because the inner plate is placed inside the hollow, it can maintain sufficient strength even when the wall thickness is thin, and it can be deformed or damaged even when subjected to sudden changes in external force or environmental temperature. There is nothing to do.

It is an annular floating ball concerning the present invention, and its assembly explanation drawing. It is a top view, a front view, and a cross-sectional view of an annular floating ball according to the present invention. It is a top view, a front view, a bottom view, a cross-sectional view, and an external perspective view of a plastic halved molded body. It is a top view, a front view, a side view, a cross-sectional view, and a perspective view of an intermediate plate. It is sectional drawing of the state which has arrange | positioned and fitted the intermediate | middle board inside two plastic half-molded bodies. It is explanatory sectional drawing of the state which has arrange | positioned the inside plate inside two plastic half-molded bodies, and after having fitted and clamped in a metal mold | die, it is filled with binding resin and is hardened.

  Hereinafter, the present invention will be described in detail with reference to the drawings which are examples.

  FIG. 1 is an explanatory view of an annular floating ball 1 according to the present invention and its assembly. As shown in FIG. 1, the annular floating ball 1 is manufactured by fitting two plastic halved molded bodies 3 from the top and bottom of the intermediate plate 4 as indicated by arrows and then joining them together with a bonding resin. . The middle plate 4 is provided with a tubular through hole 41 at the center, and a flange 42 and a bonding resin filling groove 43 projecting in both the upper and lower directions on the outer periphery. Further, a bonding resin injection path 44 that connects the tubular through hole 41 and the bonding resin filling groove 43 is also installed in the intermediate plate 4. The two plastic half-molded bodies 3 are fitted to the intermediate plate 4 so that the joint portion 31 is on the joint resin filling groove 43. Next, the molten bonding resin is filled in the bonding resin filling groove 43 and the bonding resin injection path 44 for bonding, and cured, and the half molded body 3 and the intermediate plate 4 are joined and joined to form the annular floating ball 1. To manufacture.

  In the above manufacturing, the shape of the bonded resin cured product 5 cured inside the annular floating ball 1 is shown in the upper right part of FIG. The bonded resin cured product 5 includes an annular hole cured portion 51, a filling groove cured portion 53, and an injection path cured portion 54. The central hole hardening part 51 is hardened in the tubular through hole 41, and the central part is cut through after hardening to form a through hole, and the central hole joint part 32 of the two plastic half-molded bodies 3 is formed. It is joined. The filling groove hardening portion 53 is hardened in the bonding resin filling groove 43, and the outer peripheral joint portion 31 of the half-molded product 3 is joined from the inside. The outer periphery of the cured product corresponds to the outer peripheral joint portion 31. The line 55 to be marked is marked. The injection path curing portion 54 is cured in the resin injection path 44. Moreover, 1-1 of FIG. 1 is a cross-sectional perspective explanatory view of the annular floating ball 1, and an intermediate plate 4 is fitted inside the two halved molded bodies 3, and these are bonded by a bonded resin cured product 5, It shows that they are integrated. In the annular floating ball 1, the central hole 2 penetrates through the center, and a chain for controlling movement in water is passed through the hole.

  FIG. 2 is a top view of the annular floating ball 1 and the like, 2A is a top view, 2B is a front view, 2C is a cross-sectional view taken along line AA, and 2D is a cross-sectional view taken along line BB. 2D is a cross-sectional view corresponding to the cross-sectional perspective explanatory view shown as 1-1 in FIG. 1, and is a cross-sectional view that longitudinally cuts the bonding resin injection path 44 installed in the intermediate plate 4. Accordingly, in the cross-sectional view 2D, the injection-cured portion 54 is mainly shown as the bonded resin cured product 5, and in the cross-sectional view 2C, the central hole hardened portion 51 and the filling groove hardened portion 53 are shown. The molded body 3 is joined.

  FIG. 3 is a top view of the plastic half-molded body 3, etc., 3A is a top view, 3B is a front view, 3C is a bottom view, 3D is a cross-sectional view taken along the line CC, and 3E is an external perspective view. The central hole 2 passes through the center of the half molded body 3. As shown in FIG. 1, the two halved molded bodies 3 are fitted from both the upper and lower sides of the intermediate plate 4. In this half-molded product 3, the central hole joint portion 32 is slightly lower than the position of the outer peripheral joint portion 31, and when the outer peripheral joint portion 31 is fitted to the intermediate plate 4, the outer peripheral joint portion 31 is formed in the bonding resin filling groove 43. The center hole joint portion 32 is brought into contact with a stopper 45 of the intermediate plate 4 shown in FIG. 4 as will be described later. The reason why the space between the two central hole joints 32 is opened is to secure an injection port for injecting the joint resin from the central hole 2 and to fill the joint resin between the two joint portions 32. It is. Further, a fitting convex portion 33 is provided inside the outer periphery of the half-molded product 3, and is fitted with a fitting concave portion 46 provided on both sides of the bonding resin filling groove 43 of the intermediate plate 4. Can be made. These two portions are not necessarily essential, but provision of the two halved molded bodies 3 and the intermediate plate 4 can be ensured by fitting the convex portions and the concave portions. It is. In addition, even if the convex part and recessed part in the half-molded body 3 and the intermediate plate 4 are interchanged, the same function can be obtained.

  FIG. 4 shows a top view of the intermediate plate 4, 4A is a top view, 4B is a front view, 4C is a side view, 4D is a sectional view taken along the line DD, 4E is a sectional view taken along the line EE, and 4F is an external perspective view. FIG. A tubular through hole 41 is provided at the center of the intermediate plate 4, and a flange 42 is provided on the outer peripheral portion so as to project in both the upper and lower directions. The inner surface of the tubular through hole 41 and the outer surface of the flange 42 are It can be fitted to the inner surface of the plastic half-molded product 3. The tubular through hole 41 and the bonding resin filling groove 43 are connected by a bonding resin injection path 44, and two bonding resin injection paths 44 are provided linearly along the diameter of the intermediate plate 4. The number of bonding resin injection paths may be one, but by providing two, the bonding resin can be filled smoothly. Furthermore, it is easy to balance the weight of floating balls. Although it is possible to provide three or more resin injection paths, it is preferable to arrange the injection paths symmetrically from such a viewpoint. Further, a stopper 45 is provided inside the tubular through hole 41, and is abutted against the central hole joint portion 32 when the half molded body 3 is fitted. Therefore, a gap corresponding to the width of the stopper 45 is generated between both of the annular hole joint portions 32 and the opening of the injection port 48 can be secured. Furthermore, it is possible to reinforce the strength of the intermediate plate by providing ribs to the intermediate plate substrate 47 as necessary.

  FIG. 5 shows a cross-sectional view of a state in which the two half-molded bodies 3 and the intermediate plate 4 are fitted and combined. The outer peripheral joint portion 31 of the half-molded product 3 is disposed so as to match the joint resin filling groove 43, and the central hole joint portion 32 is abutted against a stopper 45 provided inside the tubular through hole 41. Yes. In such a temporarily joined state, it is placed in a mold and clamped, and then filled with resin.

  FIG. 6 shows the arrangement of the two half-molded bodies 3 and the intermediate plate 4 temporarily joined in the state shown in FIG. 5 in the mold 61, clamping the mold, filling the joining resin, and curing. FIG. The bonding resin 50 is filled from the nozzle (not shown) of the injection molding machine through the sprue 62 and the gate 63 into the bonding resin injection path 44 from the injection port 48 on the tubular through hole 41 side, and then the filling port 49. Via, the filling resin filling groove 43 is also filled. After filling the bonding resin 50, the mold 61 is cooled and the bonding resin 50 is cured. After curing, the mold 61 is opened, the cured resin 50 is cut by the gate 63, the united and joined annular floating ball is taken out, and the cured resin cutting part 56 cured in the central hole is cut through, Let it be the central curing part 51. At this time, if the sprue (or runner) is left without being cut at the gate, it is cut off together. In this way, the annular float 1 shown in FIG. 1 or 2 is manufactured.

  The plastic half-molded body 3 and the intermediate plate 4 are preliminarily molded with high accuracy by injection molding. And the precision at the time of molding is not impaired by heating or pressure at the time of joining with a molten resin, and a strong joining is obtained, and the produced annular float maintains a stable buoyancy. be able to.

  As described above, the present invention has been described based on the drawings as examples, but various aspects are possible, and in the examples, an annular floating ball is shown. The shape may be a shape, an egg shape, or a polygonal shape. Further, in the half-formed product 3, the center hole joint portion 32 is lowered from the position of the outer periphery joint portion 31, and the joining resin is filled between the center hole joint portions 32. A structure in which an opening of an injection port that can be injected from the central hole can be secured, and a groove that can be filled with bonding resin in the bonding portion may be provided. In addition, various aspects can be taken without departing from the spirit of the invention.

  Various thermoplastics can be used as the plastic half-molded body, the intermediate plate, and the bonding resin. For example, polypropylene, polyethylene, polystyrene, styrene, ABS, AES, AAS, polycarbonate, polymethyl methacrylate, polyamide, polyethylene terephthalate, polyvinyl chloride, polyoxymethylene, etc. can be exemplified, and plastic half-molded product, The intermediate plate and the bonding resin are preferably the same, but if the molten bonding resin can be fused to the half-molded body and the intermediate plate, these can be used in combination. Furthermore, various additives, fillers, and coloring agents can be added to these thermoplastics as necessary.

  The annular floating ball according to the present invention can be suitably used as a floating ball for controlling the opening and closing of the discharge valve of the flush water tank of the flush toilet, but it can be applied as a high-precision float, and the water meter of other various tanks It can also be applied as a float for oil gauges.

DESCRIPTION OF SYMBOLS 1 Annular float 2 Central hole 3 Plastic half-molded body 31 Outer peripheral joint part 32 Central hole joint part 33 Fitting part 4 Middle plate 41 Tubular through-hole 42 Flange 43 Bonding resin filling groove 44 Bonding resin injection path 45 Stopper 46 concave portion for fitting 47 middle plate substrate 48 inlet 49 filling port 5 bonded resin cured product 50 bonded resin 51 ring center cured portion 53 filled groove cured portion 54 injection path cured portion 55 wire 56 cured resin cut portion 61 mold 62 sprue 63 Gate

Claims (3)

In the manufacturing method of the annular floating ball manufactured by joining two plastic halved molded parts divided by the half surface orthogonal to the central hole,
A tubular through-hole is installed in the center, a flange projecting in both the upper and lower directions on the outer periphery, and a bonding resin filling groove on the outer center of the upper and lower flanges. Further, the bonding resin filling groove and the tubular A bonding resin injection path that connects the through hole is installed, and the outer surface of the flange and the inner surface of the tubular through hole are an intermediate plate that can be fitted to the inner surface of the plastic halved molded body,
Placed inside two plastic halves,
After fitting so that the outer peripheral joint part of both the half-molded products and the joining resin filling groove of the intermediate plate match, after placing in the mold and clamping,
Fill the melt-bonded resin from the central hole into the bonded resin injection path, the bonded resin-filled groove, and the joint part of both halved molded bodies, and then cure the filled resin,
A method for producing an annular floating ball, characterized in that both halved molded bodies and an intermediate plate are joined together. 2. The method of manufacturing an annular floating ball according to claim 1, wherein two bonding resin injection paths are provided along the diameter of the intermediate plate. A tubular through hole is installed in the center, a flange projecting in both the vertical direction and a bonding resin filling groove on the outer center of the upper and lower flanges are installed on the outer periphery, and the bonding resin filling groove and the tubular penetration are further provided. A bonding resin injection path that connects the holes, and the outer surface of the flange and the inner surface of the tubular through-hole are an intermediate plate that can be fitted to the inner surface of the plastic half-molded body,
Arranged inside two plastic halved molded parts divided by a half face perpendicular to the central hole,
It is fitted so that the outer periphery joint part of both the half-molded bodies and the joining resin filling groove of the intermediate plate match.
And, the bonding resin is filled and cured in the bonding resin injection path, the bonding resin filling groove, and the joint portion of both halved molded bodies,
An annular floating ball in which the halved molded body and the intermediate plate are joined together.

Images