JP3180102B2 - Flanged socket and its manufacturing method - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a blow-molded socket made of synthetic resin and used for drainage equipment and the like, and a method for producing the same.

[0002]

2. Description of the Related Art In general, a branch pipe is known as one of members for drainage equipment. This branch pipe is originally used when a mounting pipe is installed by making a hole in a sewer main pipe, and its structure is a flange. And a short tube with a one-sided socket.

The applicant of the present invention has proposed the following for such a branch pipe, particularly for a synthetic resin branch pipe formed by blow molding.

[0004] That is, as shown in FIG. 4, in a blow molding die 30, a movable mounting plate 31 is connected to a cylindrical outer die 32.
The original pipe P, which is a short pipe made of hard vinyl chloride and having a predetermined length, is passed through the inner mold 33 and fitted to the moving core 34 so as to be fitted outside. Next, the movable mounting plate 31 is mounted on the cylindrical outer mold 32. Next, very low pressure heating air is supplied to the nozzle hole 35 of the moving mounting plate 31 to soften the original tube P, and then the moving core 34 is moved to the inner mold 33 side, and the end of the moving core 34 is moved. When the part has advanced to the inner mold 33, it stops. At this time, the original tube P is swelled in the radial direction by the moving core 34 to form a one-side socket 36.

Next, the movable mounting plate 31 is made to approach the inner mold 33 and a low pressure (3 to 4 kg /
cm ² ) of heated air. As a result, while the original pipe P swells in the radial direction, the axial distance between the movable mounting plate 31 and the inner mold 33 is gradually reduced. Further, when the movable mounting plate 31 is moved closer to the inner mold 33 and the supply of the heated air is stopped, the portion of the original tube P bulged in the radial direction as shown in FIG. The flanges 37 are formed in close contact with each other.

In this manner, a branch pipe made of PVC, that is, an inexpensive one-sided socket 36 with a flange 37 can be formed by blow molding.

On the other hand, FR for purifying domestic wastewater
A contact aeration type treatment tank made of P is known, but this contact aeration type treatment tank is, for example, three aeration tanks are connected in series if the family is composed of 8 people, and a sedimentation tank is provided before it. Yes,
An inflow pipe, a transfer pipe and an outflow pipe are connected to these tanks.

In the contact aeration type processing tank, the tank and the pipe are connected by using a flanged double-sided socket instead of using the flanged single-sided socket (branch pipe).

[0009]

However, in the blow-molding method of the one-sided socket with a flange (branch tube), since a two-folded flange is formed, the socket on the side cannot be formed. Socket is blown
Since molding cannot be performed and injection molding is generally used, there is a problem that equipment costs required for a high-pressure injection molding machine and its mold are expensive, and the product price is increased.

In particular, when a double-sided socket with a flange attached to the outer surface of the tank is used, the mounting side of the tank is not necessarily vertical, and the flange of the injection-molded product and the double-sided socket are integrally formed. Therefore, there is a problem that the sockets do not open horizontally.

SUMMARY OF THE INVENTION An object of the present invention is to provide a flange with flexibility while manufacturing a double-sided socket with a flange as inexpensively as a single-sided socket by blow molding.

[0012]

SUMMARY OF THE INVENTION In order to achieve the above object, the gist of the present invention is as follows. 1) A doughnut-shaped synthetic resin thick plate and a flange to be attached to the outer surface are provided at substantially the center thereof. The synthetic resin original tube is blown by the set mold.
A rubber ring socket or a TS socket, and the flange is integrated so as not to come off from the outer periphery of the socket by blow molding for molding the socket. In a double-ended socket with a flange formed by molding and a socket, and 2) in a mold in which a donut-shaped synthetic resin thick plate and a flange to be attached to the outer surface are set in the approximate center thereof in advance,
An original tube made of synthetic resin is set, and the original tube is blown to form a socket as a rubber ring port or a TS port, and the flange is blow-molded to form the socket. A method of manufacturing a socket with a flange comprising a flange and a socket by blow molding, characterized in that the socket can be inclined with respect to the opening surface of the socket with the center as the center. A synthetic resin raw tube is blown with a mold having a doughnut-shaped synthetic resin thick plate provided with a moving portion and a flange attached to the outer surface substantially at the center thereof, and a double-ended socket and both ends are formed. Each of the arc surfaces sandwiched by the mouth sockets is formed, and the socket is formed by blow molding so that the sliding portion is slidable on the arc surface so that the flange has flexibility and is integrally formed. Bro, characterized in that the - is in the flange and the flanged both openings socket consisting of a socket by molding, also, 4) in the double-ended socket flanged, either receptacle stopper both said outlet socket -
The flanged single-sided socket according to claim 3, wherein the reduced-diameter portion side is cut into a flanged single-sided socket.

[0013]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described in detail with reference to embodiments shown in the accompanying drawings. FIG. 1 is a view showing an embodiment of the present invention, in which (A) is a cutaway side view of the upper half, (B) is a partially omitted front view, FIG. 2 is a view of another embodiment, and FIG. FIG. 3 is a diagram illustrating a mold used in these embodiments and main parts of FIGS. 1 and 2.

The double-sided socket with flange 1 of this embodiment is manufactured at low cost by blow molding, and is used for a treatment tank for purifying domestic wastewater and a pipe for drainage and the like. It is used not only for connecting a pipe, but also for connecting a general drain pipe to a concrete manhole and for building piping.

First, the outline of the structure of the flanged double-sided socket 1 and the manufacturing (forming) method thereof will be described.

In FIGS. 1, 2 and 3, the double-sided socket 1 with flange is made of synthetic resin such as PVC.
The double-sided socket body 2 and the flange 3 are separate bodies before molding, but are integrated by blow molding.

The double-sided socket with flange 1 is manufactured as follows.

A donut-shaped flange 3 previously formed by injection molding or punching of a synthetic resin plate or the like is set at the center or substantially the center of a blow molding die 4. After setting the original tube which is a synthetic resin short tube, blow (blow) ordinary pressurized and heated air (fluid) or preheat the original tube and blow compressed air to open both ends. The sockets with flanges 1 and 5 are formed by a method of forming the sockets 5 and 5 and mounting the flange 3 so as not to come off the center outer periphery of the socket body 2.

Next, the blow molding die 4 will be described.

The mold 4 is entirely cylindrical.
The left and right socket molds 6 and 6 are integrally formed with a flange mold 7 sandwiched between the socket molds 6, and the mold 4 composed of these is located at the center thereof. When the line O is made horizontal, it is divided into two in the vertical direction.

Each of the cavities of the two socket molds 6 has an outer shape of a receiving port for molding the socket 5 by blowing the original tube, and has an outer diameter 8 of the receiving stopper portion. It can be molded.

The socket mold 6 is not shown in the drawing because the socket 5 having the same nominal diameter is applied to a VP pipe (for general piping) and a VU pipe (thin wall used for drainage and ventilation). However, a mold having a cavity with a different thickness can be attached to and detached from the inside of the matrix.

On the other hand, the flange mold 7 is entirely in the form of a thick donut plate, into which the donut plate 9 of the donut flange 3 is inserted with a slight gap. Do
A hole 10 for a nut plate and a hole 12 for a sliding plate into which a thin arc-shaped sliding plate (body or part) 11 integrally provided on the inner diameter side of the donut plate 9 is inserted through a slight gap. , Are recessed.

On the inner diameter side on both sides of the sliding plate hole 12, sliding arc surfaces 13, 13 having a radius R1 are formed so that the sliding plate 11 can slightly reciprocate in an arc shape after blow molding. The outer end of the sliding arc surface 13 and the outer end of the outer diameter 8 of the stopper portion coincide with each other.

The details of the double-flanged socket 1 with a flexible flange obtained by blow-molding an original tube with the above-described blow molding die 4 will be described.

A donut plate 9 with an arc-shaped sliding plate 11 is inserted and set in advance in each of the holes 10 and 12 of the flange mold 7 of one lower mold 4 which is divided into two. Next, after the other upper mold 4 is covered and fixed, the original tube is inserted into the donut plate 9. Alternatively, the original tube is inserted through the donut plate 9, and the other upper mold 4 is covered and fixed.

Next, the usual blow molding (about 10 kg /
Use heated air at 150 ° C or less with a pressure of ² cm2 or less)
After cooling, the coated mold 4 is opened, and the double-sided socket body 2 and the flange 3 integrated therewith are taken out to obtain the following double-sided socket 1 with a flexible flange. .

That is, sockets 5 are formed on both sides of the double-sided socket body 2, and the radius R is sandwiched between these sockets 5 and coincides with the outer end of the receiving stopper.
An arc-shaped sliding arc surface 1 (formed by the sliding arc surface 13 of the flange mold 7) 14 is formed,
The sliding plate 11 of the flange 3 is reciprocally slidably and reciprocally slidable in an arc shape in the range of, for example, θ = approximately 5 ° on the sliding arc surface 14 so as not to come off. The double-sided socket 1 is configured.

That is, the flange 3 is attached so as to be tiltable about the center line O within a range of about 5 ° with respect to the opening surface of the socket 5. That is, the flange 3 has flexibility.

Therefore, when this flexible double-sided socket 1 with a flange is attached to, for example, the processing tank of the above-mentioned prior art, even if the mounting side surface of the processing tank is an inclined surface, the flange 3 is provided with a bolt hole 15 on the inclined outer surface. When the sliding plate 11 is attached by a bolt through which
Since it reciprocally slides in an arc shape within a range of about 5 °, that is, it exhibits flexibility, the double-sided socket body 2 is straightened and opened, which is convenient for piping work and the like.

The double-sided socket with a flexible flange 1 can be modified into a single-sided socket with a flexible flange.

In other words, when one of the sockets 5 is cut in a direction perpendicular to the center line O (or simply called a cut tube) in the vicinity of the enlarged diameter of the receiving stopper enlarged portion 16 or the outside thereof, the socket can be remodeled immediately. Therefore, the pipe can be cut at the construction site, and the workability can be improved.

When the flexibility of the flange 3 (slidability or tiltability of the flange 3) is improved,
If the nominal diameter increases and the sliding resistance increases,
As shown in (B), a flange in which an O-ring 17 of a JIS standard G type (for fixing only), which is slightly hard and can resist a blow, is embedded in the center of the arc surface of the sliding plate 11, that is, in the sliding surface. 3 is used.

When the O-ring 17 is used, for example, a seal between the inclined surface of the processing tank and the double-sided socket 1 with the flexible flange is provided.
The effect of improving the sealing property is also exhibited, and other sealing work can be omitted.

The main specifications of the double-ended socket 1 with a flexible flange as described above will be described.

That is, the material of the raw tube is PVC and the nominal diameter is 1
In the case of a 00 mm VP tube, d1 = 1 in FIG.
14.55 mmφ, d2 = 113.55 mmφ, socket length L = 50 mm, diameter of flange 3 180 mmφ, thickness t of flange 3 t = 6 mm, R1 = 57 mm.
And especially, nominal diameters 50 mm, 65 mm, 75 mm, 1
25 m and 150 mm can be conveniently manufactured. Of course, it can also be manufactured for 200 mm or 250 mm sewer pipes.

Next, a non-flexible double-sided socket 20 according to another embodiment of the present invention will be described using the blow molding die 4 as it is.

This non-flexible double-ended socket with flange 20
As shown in FIG. 3C, a flange 23 consisting of a simple donut plate 22 is used for the double-sided socket body 21.

That is, the flange 23 is inserted and set in the hole 10 for a donut plate in the mold 4 for blow molding shown in FIG. 3, and the original tube is inserted through the flange 23 to perform blow molding.

The inner diameter of the donut plate 22 of the flange 23 is determined by the reduced diameter portion 2 of each socket stopper of the socket 24 on both sides.
Since the outer diameters are matched with the outer diameters of 5, 25, the flow path area of the non-flexible double-sided socket with flange 20 is not changed.

By such ordinary blow molding, sockets 24, 24 are formed on both sides of the double-sided socket body 21. The double-sided socket body 21 is sandwiched between these sockets 24 and has a reduced diameter portion of the receiving stopper. Connection part 2 that matches 25
6 are formed, and the connecting portion 26 is swelled by the sliding plate hole 12, so that small projections 27, 27 are formed with the flange 23 interposed therebetween, and the flange 23 is gripped.

Accordingly, the flange 23 of the flanged double-sided socket 20 is fixed orthogonally to the double-sided socket body 21 and has the same structure as a conventional injection-molded product.

As a result, by simply replacing the flanges 3 or 23 with one blow molding machine, the flexible or non-flexible double-sided socket 1 or 20 with a flange can be formed, thus reducing equipment costs. The product price can be further reduced.

Of course, if the cavity of the socket mold 6 of the blow molding mold 4 is changed from the shape of the TS joining port as shown in the figure to the shape of the rubber ring port, both flanged ports are provided. An extremely versatile manufacturing facility capable of molding a rubber ring socket or a single rubber socket and a single socket.

Therefore, in this specification, the term socket may be used to include a rubber ring port for a main pipe or a mounting pipe, a TS connection port, and the like.

[0046]

According to the first or second aspect of the present invention, since a flange having an arbitrary shape and a desired socket are integrated at the time of blow molding for forming the socket, productivity can be improved, and An inexpensive flanged socket can be provided and the flange can be flexible or non-flexible relative to the socket.

According to the third aspect, not only can the two-sided socket with a flexible flange be provided at low cost by blow molding, but also the flange can be freely adjusted with respect to the two-sided socket body (center line O).
Rocking around. That is, the flange can be inclined with respect to the socket opening surface. ), The pipe joint is extremely inexpensive (about one-tenth the price) while having the same effect as the universal joint, and is advantageous in terms of piping.

For example, when a flange is attached to a concrete man
An inflow pipe with a large pipe inclination can be connected to the socket buried in the pipe.

According to the fourth aspect, by simply cutting one of the two-sided sockets, a one-sided socket with a flexible flange can be provided, and the workability at the construction site can be improved.

[Brief description of the drawings]

FIG. 1 is a diagram showing an embodiment of the present invention.

FIG. 2 is a diagram showing another embodiment.

FIG. 3 is a mold diagram of the embodiment of the present invention.

FIG. 4 is a diagram of a conventional example.

[Explanation of symbols]

1 ... double-sided socket with flange, 2 ... double-sided socket body, 3
... Flange, 4 ... Mold, 5 ... Socket, 11 ... Sliding plate,
13, 14 ... Sliding arc surface

──────────────────────────────────────────────────続 き Continued on the front page (58) Field surveyed (Int. Cl. ⁷ , DB name) F16L 23/026 B29C 49/20 F16L 23/024 F16L 23/028

Claims (4)

(57) [Claims] 1. A doughnut-shaped synthetic resin thick plate and an outer surface
A synthetic resin raw tube is blown by a mold having an attached flange set substantially at the center thereof, and a rubber ring socket or T
Together forming the S receptacle serving socket, said flange, blow molding the socket - consisting flange and socket according molding - by molding, blow, characterized in that integrated so as not to deviate from the outer circumference of the socket Double- sided socket with flange. 2. A doughnut-shaped synthetic resin thick plate is used in advance.
A synthetic resin raw tube is set in a mold in which a flange to be attached to the outer surface is set substantially at the center thereof , and the raw tube is blown.
A socket which is a rubber ring socket or a TS socket is formed, and the flange is formed by a blow molding for forming the socket.
According to the shape, it can be inclined with respect to the socket opening surface about the center line of the socket, and is integrated with the socket.
That the preparation of the socket with flange. 3. A synthetic resin raw tube is formed by a mold made of a doughnut-shaped synthetic resin thick plate provided with a sliding portion on the inner diameter side and a flange set on the outer surface substantially at the center thereof. blow - to the arcuate surface sandwiched by both the mouth socket and the both opening socket while forming respectively, to mold the socket
Bro - from the flange and the socket by molding - by molding, the blow of the sliding portion is slidable on the arc surface, characterized in that integrated in remembering flexibility to the flange
Consisting of both the mouth socket with flange. 4. The double-sided socket with flange according to claim 1,
The Ryokuchi one receptacle stopper socket - Bro according to claim 3, the reduced diameter portion side cut pipe and is characterized in that the single-ended socket flanged - Flanged katakuchi socket by molding.