JPH0957854A - Fusing method and fusing machine for thermoplastic resin pipe material - Google Patents

Abstract

(57) An object of the present invention is to provide a fusion bonding method and a fusion bonding machine with high reliability and work efficiency of fusion bonding. SOLUTION: An annular magnetic body 3 is arranged on the outer peripheral surface of the outlet of the pipe P and the inner peripheral surface of the receiving end of the joint J, and heat generated by applying a high-frequency magnetic field to the magnetic substance in this state causes heat generation of the magnetic substance. The outer surface of the P outlet and the inner surface of the joint J are melted. As described above, by using the magnetic body 3 as the heating element and using the high frequency power as the heating energy, uniform heating and melting can be performed, and as a result, the intended purpose can be achieved.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method of connecting a pipe material made of resin and a joint by fusion bonding, and more specifically, a thermoplastic resin used for clean applications such as transportation of ultrapure water. The present invention relates to a fusing method and a fusing machine suitable for connecting a resin pipe material and a joint.

[0002]

2. Description of the Related Art Conventionally, an adhesive has been used for connecting a thermoplastic resin pipe and a joint. However, if this joining method is used for connecting a pipe of a transport path for ultrapure water, organic substances in the adhesive will be used. Elutes in ultrapure water and causes a serious problem in clean applications such as a decrease in cleanliness (purity) of ultrapure water.

Therefore, in recent years, a method of fusion bonding without using an adhesive has been adopted for connecting pipe materials used for clean applications. One of the fusion bonding methods is shown in FIG. 6, for example. As described above, the outer surface of the pipe P and the inner surface of the joint J are heated and melted by the heat source H through the heater faces (heating types) Fp and Fj, and then the pipe J is inserted into the joint J. Then, there is a method of fusion-bonding both (Japanese Patent Publication No. 42340/1990).

[0004]

When the heater faces Fp, Fj having the structure shown in FIG. 6 are used, the temperature near the heat source H becomes higher than that at the distant parts, and the respective positions of the heater faces Fp, Fj are increased. There is a problem in that it is not possible to uniformly heat the joint surfaces of the spigot and the receptacle because the temperature variation at the temperature becomes large.

Further, in the conventional fusion bonding method, when fusion bonding of various sizes (caliber) is continuously performed, it is necessary to replace the heater face at a high temperature (for example, 200 ° C. or higher) each time the size is changed. After replacing the heater face, it takes a lot of time to heat the heater face used for the next connection to the working temperature, and there is also a problem that the waiting time reduces the work efficiency.

[0006] In this type of fusion bonding method, for example, when using PVC pipe materials and joints, the product has a dimensional tolerance of a few millimeters. Is the minimum dimension, the adhesion to the heater face becomes poor during heating, the melting does not complete in the standard heating time, and a gap occurs at the fusion-bonded portion, causing defective water leakage. There are also problems such as.

The present invention has been made in view of such circumstances, and an object of the present invention is to provide a fusion bonding method with high reliability and work efficiency of fusion bonding, and to carry out such a method. An object is to provide a suitable fusion bonding machine.

[0008]

In order to achieve the above object, the method of the present invention comprises heating and melting the outer surface of the inlet of the pipe and the inner surface of the receiving end of the joint, and then inserting the end of the pipe into the receiving end of the joint. In the fusion method of fusion-bonding both with,
An annular magnetic body is placed on the outer peripheral surface of the pipe mouth and the inner peripheral surface of the receiving mouth of the joint, and heat generation of the magnetic body generated by applying a high frequency magnetic field to the magnetic body in this state causes the outer surface of the pipe mouth and the joint Characterized by melting the inner surface of the receptacle.

As described above, by using the magnetic material as the heating element and using the high frequency power as the heating energy, uniform heating and melting can be performed. That is, when a high-frequency magnetic field is applied to a magnetic body using an induction coil, the magnetic body itself generates heat due to induction heating, and the entire body instantly reaches a uniform temperature. By heating the outer surface and the inner surface of the receiving opening of the joint by heating, the joint surfaces of the outlet and the receiving opening can be uniformly melted.

Further, in the present invention, since the magnetic material is heated by using the high frequency power only when the pipe material and the joint are heated and melted, the heating condition is always constant, whereby the fusion bonding is continuously performed. Even if there is, the heating state does not vary depending on the joining work.

On the other hand, an apparatus suitable for carrying out the fusion bonding method of the present invention is, for example, as shown in FIG. 1, the outer surface of the outlet of the pipe P held by a pair of clamps 1 and 2, and the receiving port of the joint J. If the configuration is provided with an annular magnetic body 3 disposed on the inner surface, an induction coil 4 disposed inside or outside of the outlet and the receiving port, and a high frequency power source 5 for applying high frequency power to the induction coil 4. Good.

The magnetic material used in the present invention may be cylindrical (see FIG. 1), or
As shown in FIGS. 3 and 4, a band-shaped member B made of a magnetic material may be spirally wound, and if such a spiral structure is adopted, it is possible to cope with fusion bonding of plural kinds of sizes. In addition, the outer surface of the outlet of the pipe P and the joint J
The magnetic substance can be adhered to the inner surface of the receptacle of the.

Further, in the present invention, if the surface of the magnetic material is coated with a heat-resistant resin, it is difficult for the melted portion of the inlet of the pipe material and the receiving portion of the joint to adhere to the surface of the magnetic material, so that after heating and melting. Good releasability of the magnetic material.

The magnetic material used in the present invention is preferably a ferromagnetic material such as iron, stainless steel, iron alloy, or aluminum. The fusion method and fusion machine of the present invention are made of PP, PE, PVC, cPVC or PVDF.
It can be used for fusion-bonding such as.

[0015]

Embodiments of the present invention will be described below with reference to the drawings. First, the fusion machine (the entire structure is not shown) shown in FIG. 1 includes a pair of clamps 1 and 2 arranged to face each other, a cylindrical magnetic body 3, an induction coil 4 and a high frequency power source 5. I have it.

The pair of clamps 1 and 2 respectively hold the pipe material P to be fusion-bonded and its joint J individually.
The structure is such that they can move relative to each other toward and away from each other.

The magnetic body 3 is used as a heating element, and the inner diameter of the cylinder has a dimension corresponding to the outer diameter of the pipe material P to be connected. Can be inserted. Further, the outer peripheral surface of the magnetic body 3 is formed into a conical taper shape so as to correspond to the inner surface of the receiving port of the joint J, and the end portion on the small diameter side can be inserted into the receiving port of the joint J.

The induction coil 4 is wound with a diameter larger than that of the pipe material P and the joint J, and is arranged outside the outlet of the pipe material P and the receiving end of the joint J at the time of heating and melting, which will be described later. In this state, high frequency power is supplied from the high frequency power supply 5.

Next, the procedure for fusion-bonding the thermoplastic resin pipe material P and the joint J using the fusion machine having the above structure will be described with reference to FIG. 2 and FIG. . First, a pair of clamps 1 and 2 are placed in a clamp open state with a predetermined gap therebetween, and an induction coil 4 is placed between the clamps 1 and 2.

Next, the magnetic body 3 is inserted into the receiving port of the joint J and placed in the clamp 2, and the pipe material P is clamped.
Place each and tighten each clamp. At this time, each clamp is clamped in a state where the outlet of the pipe material P is fitted inside the magnetic body 3 put in the receiving port of the joint J.

When high frequency power is supplied from the high frequency power source 5 to the induction coil 4 in the above-mentioned setting state, that is, in the state shown in FIG. 1, a high frequency magnetic field is applied to the magnetic body 3, whereby the magnetic body 3 generates heat and the tubular material The outer surface of the outlet of P and the inner surface of the receiving port of the joint J are heated and melted.

Then, as shown in FIG. 2 (a), after the pair of clamps 1 and 2 are opened and the induction coil 4 and the magnetic body 3 are removed from between the clamps 1 and 2, the pair of clamps 1 , 2 are relatively moved to insert the inlet of the pipe material P into the receptacle of the joint J to perform fusion bonding [FIG. 2 (b)].

Here, in the embodiment shown in FIG. 1, the magnetic material 3 is sandwiched between the outer surface of the outlet of the pipe P and the inner surface of the outlet of the joint J to temporarily fit the pipe P and the joint J. Since the heating and melting are performed in the state, the centering work for both of them can be omitted, and the work can be easily performed even when the angle is required. As a result, work efficiency is improved.

Incidentally, the heater face F shown in FIG.
Compared to the case where fusion bonding of pipe materials of the same size was performed using P and Fj, the time required for one welding operation was 1
It was confirmed that it can be shortened to about / 2 to 2/3.

FIG. 3 is a diagram showing another embodiment of the present invention. The fusion machine shown in FIG. 3 is characterized by the structure of the magnetic bodies 13p and 13j used as heating elements.

That is, each of the magnetic bodies 13p and 13j used in this embodiment has a structure in which a strip-shaped member B made of a magnetic material is spirally wound, and the inner and outer diameters thereof can be expanded / contracted. Has become. These magnetic bodies 13p and 13j are incorporated in the heating unit 10.

The heating unit 10 is provided with a support base 11 made of an insulating material such as ceramics and having a central opening, and a roll (not shown) around which the strip-shaped member B constituting each magnetic body 13p, 13j is wound. The belt-shaped member B is pulled out from the roll when the diameter of each magnetic body 13p, 13j is expanded, and the belt-shaped member B is wound around the roll when the diameter is reduced. A jig 12 for defining the diameter is detachably attached to the heating unit 10.

In this embodiment, each induction coil 14p, 14j has a structure in which the pipe material P side is arranged outside the magnetic body 13p and the joint J side is arranged inside the magnetic body 3j.

Then, in the fusion machine having the above structure, when the size of the connecting pipe material is changed, a jig 12 for diameter regulation is used, and each magnetic material 13p, depending on the diameter of the pipe material after the size change, By simply expanding and contracting the diameter of 13j, the size can be changed without replacing the magnetic bodies 13p and 13j which are heating elements. By the way, when the fusion work was actually performed, the magnetic material 13p, 1 up to about 3 sizes
There was no need to replace 3j. Note that the diameter defining jig 12 may be removed from the magnetic bodies 13p and 13j during heating and melting, or if interference with the pipe material P and the joint J can be avoided, the diameter defining jig 12 is You may heat-melt in the state with mounting | wearing.

Further, since the inner and outer diameters of the spiral magnetic bodies 13p and 13j shown in FIGS. 3 and 4 can be finely adjusted, the inner diameter of the receiving port of the joint J varies depending on the product. Even if they are different, in any case, the magnetic body 13j can be brought into close contact with the inner surface of the receiving port of the joint J, whereby uniform and reliable heating and melting can be always performed in the standard heating time. The same applies to the pipe material P in this respect.

In the case where the magnetic material is spirally wound as described above, for example, as shown in FIG. 5, an uneven fitting portion C may be provided along the joint of the belt-shaped member B. , Points to increase the overall strength of the spiral magnetic body,
It is preferable for improving the operability when the diameter is reduced.

The surfaces of the magnetic bodies 3 and 13p and 13j used in the embodiments of FIGS. 1 and 3 may be coated with a heat resistant resin. As the coating material, a material having a higher melting point and better releasability than the pipe material to be connected, such as PTFE (tetrafluoroethylene) or fluororubber is used.

Further, as a coating material, a material that radiates far infrared rays with high efficiency, for example, Tetuzole B-66.
(Trade name: manufactured by Nippon Paint Co., Ltd.), Pyromark (trade name: manufactured by Tempil Co.) or Ceracoat 31 (trade name: manufactured by Odek Co., Ltd.), or the coating material is filled with these far infrared radiation materials. In other words, even if there is a portion where the magnetic body does not adhere to the inner surface of the receiving port due to the dimensional tolerance of the joint product, there will be no variation in heating due to radiant heat, and uniform heating and melting will be possible.

Further, as the shape of the induction coil used in the present invention, a generally known single-turn type,
Examples include multi-turn type, hairpin type and pancake type.

[0035]

As described above, according to the present invention,
Since the magnetic material is used as the heating element and the heating and melting are performed by the heat generation of the magnetic material itself by the induction heating, the outer surface of the outlet of the pipe material and the inner surface of the receiving end of the joint can be uniformly heated and melted. As a result, the reliability of the bonding strength is improved. further,
Since the magnetic material is heated using high-frequency power only during heating and melting, there is no variation in the heating state even during continuous work, and size change is required when continuously performing fusion bonding of various sizes. The time is short and the work efficiency is improved.

In the present invention, if a magnetic member having a structure in which a belt-shaped member is spirally wound is used, it is possible to perform fusion bonding of pipe materials of a plurality of sizes without exchanging the magnetic member. . In addition, by using a magnetic material with such a spiral structure, it is possible to bring the magnetic material into close contact with the heating / melting surface regardless of the dimensional tolerance of the tubular product, and this makes it possible to complete the insertion / reception at the standard heating time. The effect of being able to melt uniformly and uniformly can be achieved.

[Brief description of drawings]

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

FIG. 2 is a diagram illustrating a procedure of fusion bonding.

FIG. 3 is a diagram showing another embodiment of the present invention.

FIG. 4 shows magnetic bodies 13p and 13 used in the embodiment.
The figure which shows the structure of j typically.

FIG. 5 is a diagram schematically showing the structure of magnetic bodies 13p and 13j.

FIG. 6 is an explanatory view of a conventional fusing method.

[Explanation of symbols]

 1, 2 clamps 3, 13p, 13j magnetic material 4, 14p, 14j induction coil 5 high frequency power supply P pipe material F joint

Claims (4)

[Claims] 1. A method for connecting a pipe material made of a thermoplastic resin and a joint, wherein after heating and melting the outer surface of the outlet of the pipe material and the inner surface of the socket of the joint, the end of the pipe material is inserted into the socket of the joint. In the fusion method of fusion-bonding the two, the annular magnetic body is arranged on the outer peripheral surface of the outlet of the pipe material and the inner peripheral surface of the receiving port of the joint, and in this state, the magnetic material produced by applying a high-frequency magnetic field to the magnetic body A method for fusing a thermoplastic resin pipe material, which comprises melting the outer surface of the outlet of the pipe material and the inner surface of the receiving end of the joint by heat generation. 2. A device for connecting a pipe member made of a thermoplastic resin and a joint, wherein a pair of clamps are arranged so as to face each other and are capable of relative movement in the directions of approaching and separating from each other. In a fusion welding machine configured to heat and melt the outer surface of the inlet of the pipe and the inner surface of the receiving end of the joint while gripping the pipe and the joint, and to bring these fused parts into contact by the movement of the clamps on the approach side. , An annular magnetic body disposed on the outer surface of the outlet of the pipe material held by the clamp and the inner surface of the receiving end of the joint, an induction coil disposed inside or outside of the outlet and the receiving end, and high-frequency power is applied to this induction coil. A fusion splicer characterized by being provided with a high frequency power supply. 3. The fusion machine according to claim 2, wherein the annular magnetic body has a structure in which a band-shaped member made of a magnetic material is spirally wound. 4. The fusion machine according to claim 2, wherein the surface of the magnetic body is coated with a heat resistant resin.