JPH08156102A - Automatic welder for thermally weldable resin-made tubular part - Google Patents

Abstract

PURPOSE: To enable thermal welding of a thermally weldable resin-made tubular part to be carried out without requiring skillfulness by a method wherein a cutting part, an abutting part, and a fusing part are arranged at specific intervals in a rotary direction to a rotary disk driven by dividing, and one side tubular part is brought relatively close to the other side one fused by the fusing part to be welded thereto. CONSTITUTION: A pair of tubular parts 12, 12a are set to tubular part receiving parts 16, 17. An abutting part 24 arranged to a rotary disk 30 knocks respective end faces against each other so as to become plane surfaces in a direction normal to an axis, and clamping parts 10, 11 clamp appropriately them. Then, a cutting part 26 chamfers an end face of the tubular part 12a clamped by the clamping part 11, and chamfers an end face of the tubular part 12 clamped by the clamping part 10. Then, a support arm 14b is moved to make intervals to the clamping parts 10, 11 specified lengths. After preheating by a preheating heater of a fusing part 36, the fusing part 36 is inserted between a pair of the tubular parts 12, 12a by a linear transfer mechanism, and heated for a specified time. Thereafter, the tubular part 12a is moved to the tubular part 12 side to weld the tubular parts 12, 12a to each other.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an apparatus for abutting and automatically welding a pair of heat-weldable resin-made tubular parts facing each other, and more particularly to a fluororesin such as polyfluoroalkoxy or polyvinylidene fluoride. ,
The present invention relates to an automatic welding apparatus for heat-weldable resin tubular parts that automatically abuts thermoplastic resin piping materials such as super-engineering plastics such as polyphenylene sulfide and polyetheretherketone against each other.

[0002]

2. Description of the Related Art In recent years, there has been an increasing demand for higher quality resins in the fields of chemicals, food, semiconductor industry, biotechnology, chemical industry, housing, gas, etc. due to their chemical resistance and cleanliness. For example, polyfluoroalkoxy, Fluorine resins such as polyvinylidene fluoride and super engineering plastics such as polyphenylene sulfide and polyether ether ketone have come to be used as piping materials.

As a method of constructing the pipe, it has been common to process the end surface of the pipe material into flare and use flange connection or use fitting (joint) for connection.

However, this construction method has problems that the construction is expensive, there is a risk of liquid leakage, and it is difficult to maintain cleanliness.

In order to solve this problem, attention has been paid to a construction method by welding a piping material made of a thermoplastic resin, and some welding devices have been developed.

That is, in the prior art, as the basic steps of welding, a step of flattening the end surface of a pipe or the like perpendicular to the axis of the pipe, a step of melting the formed end surface with a heater, and a heater being removed. It consists of a process of pressing the end faces of a pipe or the like and a process of holding and cooling.

Further, as disclosed in, for example, Japanese Unexamined Patent Publication No. 4-229231, particularly in an apparatus for butt welding plastic tubular parts, a chuck device for holding the parts in the axial direction does not come into contact with the end of the parts by a heat ray. There is a heating device for heating the portion, and the heating device includes a heating element made of an electrically heatable metal plate coated with a ceramic coating layer.

Further, as disclosed in Japanese Patent Application Laid-Open No. 3-92335, a support cylinder is provided around the tubular member made of a thermoplastic material, and a supporting device is provided around the inside of the tubular member. A welding device for a tubular member, comprising: a heating device for melting a thermoplastic material constituting the tubular member, the tubular member being surrounded by the supporting tube and the supporting device, wherein the heating device is at least one first infrared ray. There has been one in which a heating source is provided and the support cylinder is made of an infrared permeable material.

Further, as another known example, there is a welding device as shown in Japanese Patent Publication No. 43054/1988 and Japanese Patent Laid-Open No. 63-104824.

[0010]

By the way, in such a basic process of conventional welding, these processes must be carried out separately, and in order to obtain an appropriate molten state, the heater temperature must be adjusted. However, environmental temperature and material characteristics had to be strictly controlled.

For example, in the known example disclosed in Japanese Patent Laid-Open No. 4-229231, since the heating device is a heating element made of a metal plate that can be electrically heated, the ceramic coating layer is coated, so that the ceramic coating layer is substantially uniform. It had the drawback that it took a considerable amount of time to be heated.

Due to a slight temperature variation in the ceramic coating layer, there was no choice but to widen the gap between the heating device and the plastic tubular part.

Therefore, it is necessary to raise the surface temperature of the ceramic coating layer to a considerably high temperature (for example, 1100 ° C. or higher). Therefore, the time required to heat the ceramic coating layer to the temperature required to melt the end surface of the plastic tubular component was further increased.

Further, at the above high temperature, only the surface of the end face is melted and the melting depth required for proper welding cannot be obtained.

Further, in the known example disclosed in Japanese Patent Laid-Open No. 3-92335, the first infrared heating source and the support cylinder are required, the apparatus is complicated, the handling is difficult, and the cost is high.

The present invention has been made in view of the above-mentioned problems of the prior art, and all the steps for abutting and automatically welding a pair of heat-weldable resin tubular parts facing each other ( Abut, fix, cut, melt, bond,
It is an object of the present invention to provide an automatic welding device for heat-weldable resin tubular parts capable of continuously and smoothly performing cooling and requiring no troublesome skill.

[0017]

In order to achieve the above object, an automatic welding apparatus for heat-weldable resinous tubular parts of the present invention comprises a pair of heat-weldable resinous tubular parts facing each other. In the welding device, a pair of clamp parts for respectively holding the pair of tubular parts, and a protrusion for abutting the end faces of the pair of tubular parts when the pair of tubular parts are respectively held by the pair of clamp parts. This part, a cutting part for cutting each end surface of the pair of tubular parts clamped by the pair of clamping parts into flat surfaces in the direction perpendicular to the axis of these tubular parts, and this cutting part. Including a melting portion for melting the flat surface cut by the substantially equal melting depth, the cutting portion, abutting portion and the melting portion,
At least one tubular part melted by the melting part is arranged at a predetermined interval in the rotation direction on a rotating disk driven for indexing, and the other tubular part is melted by the melting part. It is designed to be welded to each other.

As another aspect of the present invention, in a device for abutting and welding a pair of heat-weldable resinous tubular parts facing each other, a pair of clamp parts for respectively holding the pair of tubular parts, and the pair of When the tubular parts are held by the pair of clamp parts, respectively, the abutting parts for abutting the end faces of the pair of tubular parts, and the ends of the pair of tubular parts clamped by the pair of clamp parts, respectively. The edge is composed of a cutting portion for cutting and cutting almost entirely from the outer circumference to the inner circumference, and a melting portion for melting the edge cut and cut by this cutting portion to a substantially equal melting depth. Cutting part,
The abutting portion and the melting portion are arranged at a predetermined interval in the rotational direction on a rotary disk that is index-driven, and at least one tubular component melted by the melting portion is melted by the melting portion. The other tubular component is relatively close to the other tubular component so as to be welded to each other.

Further, as a preferred embodiment of the present invention, the melting portion has a heater sandwiched in a sandwich shape by a pair of infrared-transmissive glass plates, and a pair of clamps clamped by the pair of clamp portions. It is configured to be preheated before being inserted between the tubular parts, preheated to a predetermined temperature, and then inserted between the pair of tubular parts clamped by the pair of clamp parts.

Further, as a preferred embodiment of the present invention, the pair of clamp portions are configured to fix the tubular parts at two places respectively.

Further, as another preferred embodiment of the present invention, a tray for accommodating cutting chips generated at the end face cutting forming of the tubular part is arranged below the cutting part.

Furthermore, as another preferred embodiment of the present invention, an air collecting duct for sucking gas generated at the time of melting is arranged at the upper rear portion of a hood installed above the apparatus.

[0023]

The rotary disk is indexed and driven so that the abutting portion is located in the middle of the pair of tubular parts clamped by the pair of clamp portions. Next, the pair of heat-weldable resin-made tubular parts facing each other are respectively held by the pair of clamp parts.

When the pair of tubular parts are held by the pair of clamp parts respectively, the end faces of the pair of tubular parts are butted against each other by the abutting parts.

The rotary disk is indexed and driven so that the cutting portion is located in the middle of the pair of tubular parts clamped by the pair of clamping portions, respectively. Next, the end faces of each of the pair of tubular parts are flattened by the cutting portion in a direction perpendicular to the axis of these tubular parts, or almost entirely from the outer circumference to the inner circumference. To cut. The rotating disk is indexed and driven so that the fusion zone is located between the pair of tubular parts clamped by the pair of clamp parts.

The surface cut by the cutting portion is moved to a position necessary for heating, and then, for example, a melting portion having a heater sandwiched between a pair of infrared-transparent glass plates in a sandwich shape. Are melted to almost the same melting depth.

In a preferred embodiment of the invention, the fusion zone is
It is preheated before being inserted between the pair of tubular parts clamped by the pair of clamp parts, and is preheated to a predetermined temperature, and then inserted between the pair of tubular parts clamped by the pair of clamp parts. Is configured to.

The rotating disk is indexed so that nothing is present in the middle of the pair of tubular parts clamped by the pair of clamps. Then, at least one tubular part melted by the melting part is relatively close to the other tubular part melted by the melting part and welded to each other.

Since the cutting section, the abutting section and the melting section are arranged on the rotating disk at a predetermined interval in the rotation direction, the end faces of the pair of tubular parts do not cause misalignment. Reliable automatic welding is possible.

[0030]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of an automatic welding device for heat-weldable resin tubular parts according to the present invention will be described in detail below with reference to FIGS.

FIG. 1 is a basic schematic external perspective view of an automatic welding apparatus for heat-weldable resin tubular parts according to the present invention,
2 is a front view of the same, FIG. 3 is a left side view of the same, and FIG. 4 is a right side view of the same.

The automatic welding apparatus for heat-weldable resin tubular parts according to the present invention comprises a pair of heat-weldable thermoplastic resin tubular parts 12, 12a (hereinafter referred to as "tubular parts") which are opposed to each other.
Referred to as “)”, respectively.
11 (FIGS. 5 and 6) and a pair of tubular parts 12 and 12 clamped by the pair of clamp parts 10 and 11, respectively.
A cutting portion 26 that cuts each end surface of a so as to be a flat surface in a direction perpendicular to the axis of the tubular component 12 or 12a, or to substantially entirely cut from the outer circumference to the inner circumference. (FIGS. 9 and 10), and a melting portion 36 (FIGS. 12 and 13) having a heater sandwiched in a sandwich shape by a pair of infrared-transparent glass plates for melting the end face cut by the cutting portion 26. And one of the tubular parts melted by the melting part 36 is
The other tubular component melted by 6 is relatively close to the other tubular component side to be welded to each other.

The clamp parts 10 and 11 have the same structure and are respectively structured as follows. One clamp part 10 is fixed on the support arm 14a of the machine body 14 so as not to move, and the other clamp part 11 can reciprocate in the direction of the one clamp part 10 with respect to the machine body 14. Support arm 11 attached to
It is fixed to b. Although not shown, a pair of tubular parts 12, 12 clamped to the clamp parts 10, 11
In order to finely adjust the axial position of a, the clamp portions 10 and / or 11 may be attached to the body 14 so as to be finely movable.

One clamp portion 10 (fixed side) is a rectangular tubular component receiving portion 16 having four arc-shaped bottom portions 16a arranged in a cross shape fixed on the machine body 14,
It is composed of a clamp member 18 pivotally attached to the tubular component receiving portion 16 for holding and fixing the tubular component 12 placed on the tubular component receiving portion 16 from above.

The clamp member 18 is composed of two clamp arms 18a and 18b and a connecting member 18c interposed in the center thereof, and two are arranged in parallel. One end of one clamp arm 18a is pivotally attached to the tubular component receiving portion 16, and the other end is pivotally attached to the connecting member 18c. The connecting member 18c is also. It is pivotally attached to one end of the other clamp arm 18b. The other end of the other clamp arm 18b is a set screw 2 for engaging with a notch 20 that is notched at the extension end of the tubular component receiving portion 16.
It is attached by 2 so that it can be fixed freely.

The lower surface of the connecting member 18c and the lower surfaces of the two clamp arms 18a and 18b on the side closer to the connecting member 18c are fitted with the arc-shaped bottom surface portion 16a of the tubular component receiving portion 16 to form the tubular components 12, 12a. The shape is such that the outer peripheral surface can be firmly held and fixed.

The other clamp portion 11 (movable side) is a rectangular tubular component receiving portion 17 having four arc-shaped bottom portions 17a arranged in a cross shape which are mounted on the machine body 14 so as to be movable in the axial direction. And a clamp member 19 pivotally attached to the tubular component receiving portion 17 for holding and fixing the tubular component 12a placed on the tubular component receiving portion 17 from above.

The clamp member 19 is composed of two clamp arms 19a and 19b and a connecting member 19c interposed in the central portion of the clamp arms 19a and 19b arranged in parallel. One end of one clamp arm 19a is pivotally attached to the tubular component receiving portion 17, and the other end is pivotally attached to the connecting member 19c. The connecting member 19c is also. It is pivotally attached to one end of the other clamp arm 19b. The other end of the other clamp arm 19b is a set screw 2 which is engaged with a notch 21 which is notched at the extension end of the tubular component receiving portion 17.
It is attached by 3 so that it can be fixed freely.

According to the clamp part 10 and the clamp part 11, the tubular part 1 can be clamped regardless of whether the tubular part 12, 12a is I-shaped, L-shaped, T-shaped or cruciform.
2, 12a are clamped at two places, or the tubular component receiving portions 16 and 17 are received at one place and clamped at one place, so that it is possible to reliably and stably hold them. That is, as the tubular components 12 and 12a, the tubular component receiving portion 1 is used.
Since 6 and 17 are arranged in a cross shape, not only a long pipe (I-shaped), but also a T-shaped joint, an L-shaped joint, or a cross-shaped joint as shown in FIGS. 7 and 8. It is possible to provide a similar strong clamp for.

Therefore, even if the respective end surfaces of the tubular parts 12, 12a are cut by the cutting portion 26, in other words,
Even if a large moment is applied to the pair of tubular parts 12, 12a, their axes do not deviate.

In the embodiment of the present invention, the tubular parts 12 and 12a are clamped at two positions, respectively.
As a matter of course, it may be provided in one place or three places as required.

A rectangular tubular component receiving portion 16 having an arcuate bottom surface portion 16a arranged in a cross shape fixed on the machine body 14, and arranged in a cross shape movably mounted on the machine body 14 in the axial direction. Arc-shaped bottom part 1
The rectangular tubular component receiving portion 17 having 7a is used for the tubular component 1
Various sizes that fit according to the diameter of 2 (eg 1/2
~ 1 inch) and is replaceably attached.

Referring to FIGS. 15 and 16, there is shown another embodiment of the clamp portion used in the automatic welding device according to the present invention. Clamping part 5 for holding the tubular part 12
Since 0 has the same configuration as the clamp part that holds the tubular component 12a, the clamp part 50 will be described in detail below.

The clamp portion 50 is detachably fixed to the support arm 14c fixed to the machine body 14 by, for example, a bolt 51. The clamp part 50 includes tubular component receiving parts 52, 52 provided in parallel. The tubular component receiving portion 52 includes a semi-arcuate receiving surface 52a that receives the outer peripheral surface of the tubular component 12. A clamp member 54 is openably and closably attached to the tubular component receiving portion 52 via a hinge shaft 53. The tubular component receiving portion 52 of the clamp member 54
Is provided with a semi-arcuate pressing surface 54a, and the semi-arcuate receiving surface 52a and the semi-arcuate pressing surface 5 are provided.
4a holds the outer peripheral surface of the tubular component 12 over the entire circumference. The tubular component receiving portion 52 and the clamp member 54 are fastened by a fastening member 56.

In this embodiment, since the tubular part 12 is clamped by the clamp part 50 at two places, it is firmly grasped and does not move even when cutting the end face of the tubular part 12, and the cutting surface is finished neatly. Have the advantage of. Further, since a space is formed between the pair of tubular component receiving portions 52 and the clamp member 54 which are provided in parallel, there is an advantage that the tubular component 12 having the flange 12a can also be clamped.

Further, a plurality of types of clamp parts 50 are prepared in accordance with the outer diameter of the tubular part 12, and they are replaced as needed. This has an advantage that even tubular parts having different diameters can be easily dealt with without performing a troublesome adjustment work such as centering.

Referring to FIGS. 17 and 18, there is shown another embodiment of the clamp portion used in the automatic welding device according to the present invention. The pair of clamp portions 60 that clamp the tubular component 12 have the same configuration as the pair of clamp portions that clamp the tubular component 12a. Therefore, the pair of clamp portions 60 will be described in detail below.

The pair of clamp portions 60 are detachably fixed to the support arms 14d fixed to the machine body 14 independently by, for example, bolts 61. Each of the clamp portions 60 has a tubular component receiving portion 6 having a semicircular arc-shaped receiving surface 62a that is opened in the horizontal direction to receive the outer peripheral surface of the tubular component 12.
Have two. The tubular part receiving portion 62 has a hinge shaft 63.
The clamp member 64 is attached so as to be openable and closable via. A semi-arcuate receiving surface 64a opened in the horizontal direction is provided on the surface of the clamp member 64 with respect to the tubular component receiving portion 62. The semi-arcuate receiving surface 62a and the semi-arcuate receiving surface 6 are provided.
4a holds the outer peripheral surface of the tubular component 12 over the entire circumference. The tubular component receiving portion 62 and the clamp member 64 are fastened by a fastening member 66.

Also in this embodiment, the tubular component 12 can be clamped by the pair of clamp portions 60, and in that case, the tubular component 12 can be firmly gripped even when the end face of the tubular component 12 is cut. Further, if one of the pair of clamp portions 60 provided in parallel is removed, there is an advantage that the tubular component 12 can be applied to a deformed pipe such as a dogleg pipe or a pipe connected to a valve. In addition, one clamp part 60
When the tubular component 12 is clamped by only the tubular component 12, it is necessary to hold the tubular component 12 tightly so that the tubular component 12 does not become loose even during cutting or the like.

Of course, it is also possible to prepare a plurality of types of clamp parts 60 according to the outer diameter of the tubular part 12 and replace them if necessary. As a result, there is an advantage that even tubular parts having different diameters can be easily dealt with.

Reference numeral 24 is an abutting portion arranged on one rotating disk 30. The abutting portion 24 is the clamp portion 1
When the pair of tubular parts 12, 12a are clamped by 0, 11 respectively, the end faces of the pair of tubular parts 12, 12a are butted.

As a result, the pair of tubular parts 12, 12
It is possible to secure a predetermined gap size of a and to make each end surface a flat surface in the direction perpendicular to the axis.

Reference numeral 26 is a cutting portion arranged on one rotary disk 30. The cutting portion 26 is provided with a well-known special cutter 26a for cutting the facing end faces of the pair of tubular parts 12, 12a clamped by the pair of clamp parts 10, 11, respectively. 28 is a motor for rotating the special cutter 26a.

When the opposite end faces of the pair of tubular parts 12, 12a are cut, first, the other clamp part 11 is cut.
The (movable side) is linearly moved to the special cutter 26a of the cutting portion 26, and the end edge of the other tubular component 12a is cut off from the outer circumference toward the inner circumference as shown in FIG. The cutting angle for removing the frame is, for example, 0.5 ° to 10 ° or less. Tubular parts 12, 12a in the welded part around 5 °
It is optimal because it minimizes the inward protrusion.

If necessary, it may be cut substantially at a right angle.

Further, one rotary disk 30 is linearly moved to one clamp portion 10 (fixed side), and as shown in FIG. 14, the end edge of the one tubular component 12 is cut from the outer circumference to the inner circumference by removing the frame. Let

By performing the cutting and cutting in this manner, when the tubular parts 12 and 12a are welded to each other, no weld beads are generated on the inner surface or the weld beads are reduced.

The abutting portion 24 and the cutting portion 26 are arranged on a single rotary disk 30 at a predetermined distance in the rotational direction, and the abutting portion 24 is used for the pair of tubular parts 12,
The cutting portion 26 is adapted to be inserted between the pair of tubular parts 12, 12a after being separated from the space between the tubular parts 12a.

Therefore, since the abutting portion 24 and the cutting portion 26 are arranged on the single rotary disk 30, no misalignment occurs.

The rotational movement displacement from the abutment portion 24 to the cutting portion 26 is caused by the rotation of the motor 32 connected via the well-known Geneva gear 31 attached to the shaft 30a of the one rotary disk 30. Done.

As described above, by using the Geneva gear 31, there is no rattling during the end face cutting and shaping of the tubular parts 12, 12a by the cutting portion 26, and a stable shaping surface can be obtained.

A tray 34 for accommodating chips generated during end face cutting and molding is disposed below the cutting portion 26. In addition, when cutting, the cotton-like chips are cut into tubular parts 12, 12a.
If it adheres to, it is necessary to clean the cutting end face.

Reference numeral 36 is a melting portion for generating an equivalent amount of heat on both sides of the flat surface cut by the cutting portion 26, which is melted by the plate-shaped tungsten heater 36a having a continuous corrugation as shown in FIGS. is there.

Further, the melting portion 36 is arranged at a predetermined interval in the rotation direction on a single rotary disk 30 rotated through the Geneva gear 31.

The cutting portion 26 has a pair of tubular parts 12, 12a.
After being separated from the gap, the fusion zone 36 is heated to a predetermined temperature and then inserted between the pair of tubular parts 12, 12a clamped by the pair of clamp parts 10, 11. The time required for heating is, for example, about 45 seconds in the case of PFA,
After heating to about 700 ° C., the linear movement mechanism 4 as shown in FIG.
2, it is inserted between the pair of tubular parts 12, 12a clamped by the pair of clamp parts 10, 11 and heated for a predetermined time (approximately 70 seconds).

As the linear movement mechanism 42, various mechanisms such as an actuator using an air cylinder can be used in addition to the one using a ball screw. Further, as a mechanism for inserting and removing the melting part 36 between the pair of tubular parts 12, 12a clamped by the pair of clamp parts 10, 11, various mechanisms such as a rotary reciprocating mechanism in addition to the linear reciprocating mechanism shown in the figure. Can be used.

The plate-shaped tungsten heater 36a in the fusion zone 36 and the cut end surfaces of the tubular parts 12, 12a are not in contact with each other, and are approximately 1 to 10 mm, preferably 1.5 to 2.5.
mm is optimal. If it is too close, the tubular part 1 will be heated.
This is because there is a risk that the end faces of the Nos. 2 and 12a will come into contact with the fusion zone 36, while the temperatures of the fusion zone 36 have to be raised when the distance increases. At this time, the time is about 70 seconds, and the end faces of the tubular parts 12 and 12a are uniformly melted by the stable radiant heat.

That is, the melting portion 36 includes the first and second flat infrared ray transmitting glass plates 36c and 36d,
An electrically heatable plate-shaped tungsten heater 36a interposed between both glass plates, and at a position surrounding at least the plate-shaped tungsten heater 36a of both glass plates and slightly higher than the thickness of the plate-shaped tungsten heater 36a. And a built-up portion 36b made of quartz glass that can be adhered to the glass plate that is built up to the height.

In the illustrated preferred embodiment of the present invention, the infrared transmissive glass plate is made of quartz glass, but any infrared transmissive glass plate may be used, such as calcium aluminate. Alternatively, germanate glass and arsenic sulfide glass may be used.

Although not shown, the glass plates 36c, 3
It is preferable to provide a means for scattering heat rays on the surface of 6d. As a result, the end faces of the tubular parts 12, 12a can be heated almost uniformly regardless of the position of the plate-shaped tungsten heater 36, and therefore the end faces of the tubular parts 12, 12a are brought into a molten state at substantially equal melting depths. You can Thereby, bubbles (voids) in the welded portion can be dramatically reduced.

As means for scattering heat rays, for example,
There are scratches on the glass surface like ground glass, and grooves are formed vertically and horizontally or randomly. In addition, a welding agent that can melt glass, for example, a product name "Aron Ceramic" (sold by Toagosei Kagaku Kogyo Co., Ltd.) is applied to the glass surface, and after heating and curing, this Aron ceramic is removed. Since the formed cross section is irregular, the scattering property is particularly excellent. A glass plate 36 is formed by applying the same processing
It can also be attached to the surface of c and 36d.

In the first and second glass plates 36c and 36d, inside the fusion zone 36, and as a part of the built-up portion 36b, a plurality of ridges (having a height of almost 0) are arranged at predetermined intervals. ．
36 e is formed by padding. A plate-shaped tungsten heater 36 is provided between the plurality of ridges 36e.
a is provided. As a result, the first and second glass plates 36c and 36d are supported by the plurality of ridges 36e even in the central portion, so that even if a force is applied to the central portion of the fusion zone 36, damage such as cracking occurs. Less likely to occur.

A temperature sensor 38 such as a thermocouple is arranged at the center of the fusion zone 36. The temperature of the tungsten heater 36a at the time of melting is measured by the temperature sensor 38.
Is controlled and set to an appropriate temperature (approximately 600 to 800 ° C., preferably 700 to 750 ° C.). When the temperature is higher than the proper temperature, only the surface of the end face of the tubular component is melted, and the fusion depth required for proper welding cannot be obtained.

The other tubular part 12a melted by the melting part 36 is moved to the side of the one tubular part 12 melted by the melting part 36 so that the two tubular parts 12,
12a are welded to each other.

The gas generated at the time of melting is sucked by the air collecting duct 40 connected above the rear part of the hood 40 installed above the apparatus.

Next, the operating principle of the automatic welding apparatus for heat-weldable resin tubular parts of the present invention will be described with reference to the drawings.

First, quadrangular tubular component receiving portions 16 and 17 of a size matching the diameters of the pair of tubular components 12 and 12a to be welded to each other are prepared and fixed on the machine body 14.

When a pair of tubular parts 12, 12a are set in the tubular part receiving portions 16, 17 and the power of the apparatus is turned on,
A power lamp (not shown) lights up.

When the size and material of the tubular parts 12, 12a are selected by a selection switch (not shown), a select lamp (not shown) is turned on.

When the select button (not shown) is pressed after confirming the illuminated select lamp, the prepare button lamp (not shown) is turned on and the motor 32 is rotated. This motor 32
The rotation of the Geneva gear 31 causes the abutment portion 24 to stop insertion between the pair of tubular components 12 and 12a.

The pair of tubular parts 12, 12a are abutted against the abutting part 24 so that their end faces become flat surfaces in the direction perpendicular to the axis, and clamped properly by the clamping parts 10, 11, respectively. To do.

Next, when a start button (not shown) is pressed, the preparation button lamp is turned off, the start button lamp is turned on, and the motor 32 is rotated. The rotation of the motor 32 causes the Geneva gear 31 to rotate.
The cutting portion 26 arranged on the turntable 30 that rotates by the rotation of 1 stops insertion between the pair of tubular parts 12 and 12a.

In this cutting section 26, first, the other tubular component 1 clamped by the other clamp section 11 is used.
The edge of 2a is cut off from the outer circumference toward the inner circumference by the special cutter 26a.

Next, the special cutter 26a is moved to the end edge side of the one tubular part 12 clamped by the one clamp part 10, and the end edge of the one tubular part 12 is
The special cutter 26a is used to remove and cut from the outer circumference toward the inner circumference.

In this way, the pair of tubular parts 12, 12a
When the cutting of the edge of the blade is completed, the special cutter 26a
Stops rotating.

The respective edges of the pair of tubular parts 12, 12a can be cut at the same time.

Next, the support arm 14b is moved with respect to the machine body 14, and the clamp portion 1 installed on the support arm 14a is moved.
The length between 0 and the clamp portion 11 installed on the support arm 14b is set to a predetermined length.

Further, the Geneva gear 31 is rotated by the rotation of the motor 32, and the melting portion 36 disposed on the turntable 30 rotated by the rotation of the Geneva gear 31 is set to the original position as shown in FIG. The plate-shaped tungsten heater 36a of the fusion zone 36 starts preheating.

After confirming the completion of the preheating (for about 45 seconds), the melting section 36 is moved by the linear movement mechanism 4 as shown in FIG.
2, it is inserted between the pair of tubular parts 12, 12a and heated for a predetermined time (approximately 70 seconds). This heating time can be set in advance depending on the material and size of the tubular parts 12 and 12a.

Thereafter, the melting portion 36 returns to its original position from between the pair of tubular parts 12 and 12a by the linear movement mechanism 42, and cuts the power input to the melting portion 36.

The other tubular part 12a melted by the melting part 36 is moved to the one tubular part 12 side melted by the melting part 36 so as to move the two tubular parts 12, 12 together.
Weld a together.

After the natural cooling, the welding end-of-work button lamp (not shown) is turned on and the start button lamp is turned off.

A pair of welded tubular parts 12, 12a
Is removed from the clamp parts 10 and 11 and a welding end work button (not shown) is pressed, the welding end work button lamp is turned off, and the abutment portion 24, the cutting portion 26, and the melting portion provided on the Geneva gear 31 and the turntable 30 are melted. The part 36 returns to the original position.

[0094]

The automatic welding apparatus for heat-weldable resin tubular parts of the present invention is an apparatus for abutting and welding a pair of heat-weldable resin tubular parts facing each other as described above in detail. A pair of clamp parts for respectively holding the pair of tubular parts, and an abutting part for abutting the end faces of the pair of tubular parts when holding the pair of tubular parts by the pair of clamp parts, respectively, The end surfaces of the pair of tubular parts clamped by the pair of clamping parts are flattened in a direction perpendicular to the axis of the tubular parts or are almost entirely mened from the outer circumference to the inner circumference. And a melting portion that melts the end faces cut by the cutting portion to substantially equal melting depths, the cutting portion, the abutting portion, and the cutting portion. The fusing part is arranged on the rotating disk at a predetermined interval in the rotation direction, and at least one tubular part melted by the fusing part is relatively disposed on the other tubular part side melted by the fusing part. Since all the steps for automatic welding can be continuously and smoothly performed by one unit, they do not require any troublesome skill. The melted portion can be formed thin, and each end surface of the pair of heat-weldable resin tubular parts can be uniformly melted by stable radiant heat without increasing the temperature of the melted portion, Moreover, since a pair of heat-weldable resin-made tubular parts can be automatically welded in a short time, there is an effect that power consumption is reduced.

[Brief description of drawings]

FIG. 1 is a basic schematic external perspective view of an automatic welding apparatus for heat-weldable resin tubular parts according to the present invention.

FIG. 2 is a front view of the same.

FIG. 3 is a left side view of the same.

FIG. 4 is a right side view of the same.

FIG. 5 is a perspective view of the clamp section.

FIG. 6 is a perspective view showing a usage example of the clamp section.

FIG. 7 is a perspective view showing another usage example of the clamp section.

FIG. 8 is a perspective view of the abutting portion.

FIG. 9 is a left perspective view of the cutting unit.

FIG. 10 is a right side perspective view of the cutting section.

FIG. 11 is a left side view of the same.

FIG. 12 is a plan view of a heater unit.

FIG. 13 is a vertical sectional view of the same.

FIG. 14 is a vertical cross-sectional view of a pair of heat-weldable resin-made tubular parts which are opposed to each other and are abutted and welded to each other.

FIG. 15 is a plan view of another embodiment of the clamp portion used in the automatic welding device according to the present invention.

FIG. 16 is a front view of another embodiment of the clamp portion used in the automatic welding device according to the present invention.

FIG. 17 is a plan view of still another embodiment of the clamp part used in the automatic welding device according to the present invention.

FIG. 18 is a front view of still another embodiment of the clamp portion used in the automatic welding device according to the present invention.

[Explanation of symbols]

 10 One clamp part (fixed side) 11 The other clamp part (movable side) 12, 12a A pair of heat-weldable resin tubular parts 14 Machine body 16,17 Tubular part receiving parts 16a, 17a Arc-shaped bottom part 18,19 Clamp member 18a, 19a One clamp arm 18b, 19b Other clamp arm 18c, 19c Connecting member 20,21 Cut portion 22,23 Set screw 24 Abutment portion 26 Cutting portion 26a Special cutter 28 Motor 30 Rotating plate 30a Rotating plate Shaft 31 Geneva gear 32 Motor 34 Tray 36 Melting part 36a Plate-shaped tungsten heater 36b Overlay part 36c Glass plate 36d Glass plate 36e Convex ridge 38 Temperature sensor 40 Air collecting duct 42 Linear movement mechanism

Claims (6)

[Claims] 1. A device for abutting and welding a pair of heat-weldable resin-made tubular parts facing each other, wherein a pair of clamp parts for respectively holding the pair of tubular parts and a pair of the pair of tubular parts are provided. When holding by the clamp portions, the abutting portions for abutting the end surfaces of the pair of tubular parts, and the end surfaces of the pair of tubular parts clamped by the pair of clamp parts, respectively, of the tubular parts. A cutting part for cutting a flat surface in a direction perpendicular to the axis and a melting part for melting the flat surface cut by the cutting part to a substantially equal melting depth. The melting portion and the melting portion are arranged at a predetermined interval in the rotation direction on a rotating disk driven for indexing, and at least one of the melting portions melted by the melting portion. The Jo parts, automatic welding device of the heat-weldable plastic tubular part, characterized in that so as to be welded to each other close relative to the other tubular part side which is melted by the melting unit. 2. An apparatus for abutting and welding a pair of heat-weldable resin-made tubular parts facing each other, wherein a pair of clamp parts for respectively holding the pair of tubular parts and a pair of the pair of tubular parts are provided. When held by the clamp parts, the abutting parts for abutting the end faces of the pair of tubular parts, and the respective end edges of the pair of tubular parts clamped by the pair of clamp parts are inscribed from the outer circumference. A cutting portion for cutting and cutting the whole body toward the circumference and a melting portion for melting the edges cut and cut by the cutting portion to have substantially the same melting depth. And the fusion zone
At least one tubular part melted by the melting part is arranged at a predetermined interval in the rotation direction on a rotating disk driven for indexing, and the other tubular part is melted by the melting part. An automatic welding device for heat-weldable resin tubular parts, characterized in that they are made to approach each other and are welded to each other. 3. The automatic welding device for heat-weldable resin tubular parts according to claim 1 or 2, wherein the melting portion is composed of a heater sandwiched between a pair of infrared-transparent glass plates in a sandwich shape. And preheat before being inserted between a pair of tubular parts clamped by a pair of clamp parts,
After being preheated to a predetermined temperature, it is configured to be inserted between a pair of tubular parts clamped by the pair of clamping parts, and automatic welding of a heat-weldable resin tubular part apparatus. 4. The automatic welding apparatus for heat-weldable resin tubular parts according to any one of claims 1 to 3, wherein the pair of clamp portions fix the tubular parts at two positions respectively. An automatic welding device for heat-weldable resin tubular parts, which is configured as follows. 5. The automatic welding apparatus for heat-weldable resin tubular parts according to any one of claims 1 to 4, wherein a cut generated at the lower end of the cutting portion during end face cutting of the tubular part. An automatic welding device for heat-welding resin-made tubular parts, characterized in that a tray for storing powder is arranged. 6. The automatic welding device for heat-weldable resin tubular parts according to claim 5, wherein an air collecting duct for sucking gas generated during melting is arranged above a rear part of a hood installed above the device. An automatic welding device for heat-welding resin-made tubular parts, which is characterized in that