JPH0716931A - Electric melt welding apparatus of resin product - Google Patents

Abstract

PURPOSE:To properly perform melt welding work by automatically and accurately setting the heat pattern based on the kind of a resin product to be melted and welded by providing a controller automatically performing melt welding work. CONSTITUTION:When a melt welding work starting button is pushed, the output value of a potentiometer 28 is read at first to discriminate the kind such as the material quality, shape or size of a joint. The heat pattern corresponding to the kind of the joint is read from a memory and melt welding work is automatically initialized. Thereafter, a current is allowed to flow to a heating element 21 and, when the current reaches a first set current value, the output value of a temp. sensor 34 is read. Further, a gap is calculated and proper heat value is operated and the heat pattern selected and set at the time of initialization is corrected on the basis of the proper heat value.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an electric fusion welding apparatus for joining thermoplastic resin products.

[0002]

2. Description of the Related Art Conventionally, a current is applied to an electric resistance wire which is spirally wound in advance on an inner peripheral surface of a receiving end of a resin joint into which an end portion of a resin pipe is inserted to join the pipe and the joint. There was an electric fusion welding device for melting and joining parts.

[0003]

In the conventional electric fusion welding apparatus, the operator himself needs to determine the amount of heat generation (work) from the type (material, shape, size of joint) of the resin product to be welded before starting the welding operation. Therefore, the heat pattern is input to the controller and the fusion work is performed based on the heat pattern. Therefore, there is a problem that skill and experience are required for handling.

[0004]

SUMMARY OF THE INVENTION Therefore, according to the present invention, there is provided an electric fusion welding apparatus for a resin product, in which electric power is supplied to a heating element provided in the resin product to be fused to melt the resin at the joint. Depending on the product type of the resin product, the mechanical or electrical changes for product type determination given to the resin to be melted are read in advance, the heat pattern corresponding to the resin product to be melted is selected and set, and the welding process is performed automatically. A terminal that is equipped with a controller and that is connected to the terminals at both ends of the electric resistance wire exposed on the surface or end face of the resin material to be melted, and a mechanical change part or an electrical change part for product type discrimination given to the resin product to be melted And a terminal to be connected to the controller connector.

[0005]

[Operation] Therefore, in an electric fusion welding apparatus for resin products that supplies electric power to the heating element provided in the resin products to be fused and melts the resin at the joint, The controller is equipped with a controller that reads the mechanical changes or electrical changes that are applied to the resin products for product type discrimination, selects and sets the heat pattern that corresponds to the resin products to be melted, and automatically performs the welding work. The heat pattern setting (initial setting) based on the type of the resin product can be automatically and appropriately performed, and anyone can handle it and perform the fusion welding work of the resin product appropriately.

[0006] Further, the terminals to be connected to the terminals at both ends of the electric resistance wire exposed on the surface or the end face of the resin material to be melted, and the mechanical change portion or the electric change portion for determining the kind given to the resin material to be melt welded. Since the connector of the controller is provided with the terminal to be connected, the initial setting can be performed by the operation of connecting the connector of the controller to the resin product to be melted without performing a special operation.

[0007]

Embodiments of the present invention will now be described in detail with reference to the drawings. FIG. 1 is a control circuit diagram, and FIG. 2 is an external view of the entire electric fusion attachment. In FIG. ) (4)
And a button (6) for starting and stopping the fusion welding work is provided on the operation panel (5) surface on one side of the main body case (2).
(7) and a plurality of input buttons for heat pattern setting (8)
..., a digital display (9) for visually displaying the welding operation state and a heat pattern for setting and input, and a speaker (10) for generating various notification voices. In addition, a plug (1
1) Power cord (12) provided at the tip and earth cord (1) provided at the tip with a metal rod (13) that is inserted into the ground
4) and the connector (1
A connecting cord (16) provided with 5) at the tip extends from the main body case (2).

Further, (17) and (18) in the figure are joints and pipes, which are thermoplastic resin products of the same material for melting and joining the joints.

As shown in FIGS. 3 and 4, the joint (1
A heating element (21) formed in a sleeve shape by spirally winding an electric resistance wire (20) coated with an electric insulating coating is embedded in advance in the inner peripheral surface of each receptacle (19) of 7) by secondary molding. At the same time, the end faces of the respective receiving ports (19) of the joint (17) are
Electric resistance wire (20) on the inner peripheral surface of the terminals (22) at both ends
A small hole (19a) for confirming melting is provided to expose (23) and to penetrate from the inner peripheral surface to the outer peripheral surface of each receiving port (19).

The material, length, thickness, and electrical resistance of the electric resistance wire (20) are appropriately selected depending on the type, such as the material, shape, and size of the joint (17).

Further, each receiving port (19) of the joint (17)
Formed between the terminals (22) and (23) on the end surface is a recess (24) for determining the type of the joint (17) having a different depth depending on the type, such as material, shape and size.

On the other hand, fixed terminals (25) and (26) for inserting and connecting to the terminals (22) and (23) are projected from the connection end surface of the connector (15), and the fixed terminals (25) and (26) are also provided. A movable terminal (27) inserted into the recess (24) is projected from between.

Further, a potentiometer (28) as a product type sensor is provided inside the connector (15),
A rack (30) meshing with the pinion gear (29) of the potentiometer (28) is formed in the movable terminal (27) inside the connector (15), and each terminal (22) on the joint (17) side is formed.
Each terminal (25) (2) on the connector (15) side is connected to (23).
6) is inserted and connected, the movable terminal (29) on the connector (15) side is simultaneously inserted into the recess (24) on the joint (17) side.
Is inserted and the amount of retreat movement of the movable terminal (27) is detected by the potentiometer (28),
It is configured to discriminate product types such as 7) material, shape, and size.

Further, a spring (31) for elastically pressing the movable terminal (27) in a protruding direction, and the potentiometer (2).
8) A stopper (33) that abuts against the mounting bracket (32) and restricts the movement of the movable terminal (27) in the protruding direction.
The movable terminal (27) to the potentiometer (28).
It is positioned at the reference position of.

A temperature sensor (34) is provided inside the connector (15), and a detection surface (3) of the temperature sensor (34) is provided.
5) is exposed to the outside through a hole (36) formed in the connector (15), and the joint (17) is attached by the temperature sensor (34).
It is configured to detect the latest outside air temperature.

The connection cord attached with the connector (15) at the tip includes a power cord (37) connected to the terminals (25) and (26), a connection cord (38) connected to the potentiometer (28), and A connection cord (39) connected to the temperature sensor (34) is connected to the main body (1).

As shown in FIG. 1, the main body (1) is provided with a controller (40) composed of a microcomputer, and each button (6) (7) for starting and stopping the fusion welding and each for setting a heat pattern. A heat pattern setting device (41) having an input button (8), the display device (9), a voice synthesis circuit (42) of the speaker (10), the potentiometer (28), and the temperature sensor (34). And a memory (43) for storing a heat pattern is connected to the controller (40), and a joint (17) is connected to the controller (40) via the connector (15).
The heating element (21) is connected to the potentiometer (2
The type of the joint (17) is discriminated based on the output of 8), the heat pattern corresponding to the type of the joint (17) is selectively set, and the heating element (21) is based on the heat pattern.
Controls the amount of heat (work) generated by the joint (17) and pipe (18)
It is configured to perform the electric fusion welding work.

By the way, the memory (43) stores a heat pattern for each type of the joint (17). As is clear from the heat pattern diagram of FIG. 5, the heat pattern is a heating element (21). ) Current value (A)
And the time (t) are set, current starts to flow from the start of the welding work, and when the first set current value (A1) is reached, the first
Keep the set current value (A1) of the first time (t1)
When the time (t1) has passed, the current value (A) is decreased by a certain degree during the fourth time, and when the second set current value (A2) is reached, the second set current value (A2) is set to the second value. 2 hours (t
2) It is kept and the current value is set to “0” when the second time (t2) has elapsed.

Then, the joint (17) and the pipe (1) are controlled by the heat generation amount of the heating element (21) according to the first set current value (A1).
8) The resin at the joint is melted and the second set current value (A
The molten resin is fixed by the amount of heat generated by the heating element (21) by (2), and the joint portion between the joint (17) and the pipe (18) is joined.

Further, when the gap (L) between the joint (17) and the pipe (18) is large, the amount of heat transferred to the resin is small, and the temperature of the heating element (21) rises quickly and the temperature rises. Then, the electrical resistance also increases, while conversely the gap (L)
Is small, the amount of heat transferred to the resin is large, and the temperature rise of the heating element (21) becomes slow. Then, utilizing this characteristic, the joint (1
The gap (L) at the joint between 7) and the pipe (18) is detected, and the heat pattern is corrected.

When the outside air temperature at the welding work site is high, the resin temperature rises quickly, and conversely, when the outside air temperature is low,
Since the rise in the resin temperature slows down, the heat pattern is also corrected based on the output of the outside air temperature sensor (34).

This embodiment is constructed as described above, and the main body (1) of the electric fuser is brought into the welding work site, and the plug (11) at the tip of the power cord (12) of the main body (1).
Is connected to a power source provided at the welding work site, and the metal rod (13) at the tip of the earth cord (12) of the main body (1) is inserted into the ground at the welding work site to melt the main body (1). Fitting (17) after set to work
The end (19) of the pipe (18) is inserted into the receiving end (19) of the pipe, and the receiving end (19) of the joint (17) in which the end of the pipe (18) is inserted
The connector (15) at the tip of the connection cord (16) of the main body (1) is provided in the terminals (22) (23) and the recess (24) on the end surface.
The fusion welding work is automatically started by inserting the fixed terminals (25) (26) and the movable terminals (27) of the above and turning on the fusion welding work start button (6) of the main body (1). Then, as shown in the flow chart of FIG. 6, when the welding operation start button (6) is turned on, the output value of the potentiometer (28) is first read and the type such as the material, shape and size of the joint (17) is selected. It is determined and the heat pattern corresponding to the product type is read from the memory (43), and the initial setting of the welding operation is automatically performed. After that, the current starts to flow to the heating element (21), and the first set current value (A1)
When the temperature reaches, read the output value of the temperature sensor (34),
Further, the gap (L) is calculated, the proper heat generation (work) amount is calculated, and the heat pattern selected and set at the time of initial setting is corrected based on the proper heat generation (work) amount. Then, when the corrected heat pattern time (t1) has elapsed, the current value (A) is reduced to a certain degree, and the current value fall time (t
4) After that, when the second set current value (A2) is reached, the decrease of the current value (A) is stopped, and when the time (t2) elapses,
The welding operation is completed by setting the current value (A) to "0".

Further, as shown in the flow chart of FIG.
Input button (8) for setting the heat pattern of the main body (1)
It is possible to read the output value of the product type setting device (41) based on the operation and make the controller (40) determine the product type. In this case, the corresponding heat pattern is the memory (4
If it is stored in 3), the heat pattern is read out, and the fusion welding work is started. On the other hand, if the corresponding heat pattern is not stored in the memory (43), the operator is informed that work is impossible. It is a notification.

By the way, in the above embodiment, the concave portion (24)
Is applied to the end surface of the socket (19) of the joint (17), the depth of the recess (24) is converted into an electric signal by the potentiometer (28), and the controller (4
0) the type such as the material, shape and size of the joint (17) was automatically discriminated. However, as shown in FIG. 9, the joint (17) is placed inside each of the receiving ports (19) of the joint (17). A resistance element (44) having a different electric resistance value depending on the type of material, shape, size, etc. is embedded beforehand by secondary molding, and one end of the resistance element (44) is connected to the electric resistance wire (20) of the heating element (21). Terminals (45) connected to the other end of the resistance element (44) are connected between the terminals (22) (23) for the heating element (21) and the respective sockets (1) of the joint (17).
A fixed terminal which is exposed at the end face of 9) and is inserted and connected to the terminal (45) between the terminals (25) and (26) for the heating element (21) on the connection end face of the connector (15) of the controller (40) By projecting (46) and inserting and connecting the terminals (25), (26) and (46) on the connector (15) side to the terminals (22), (23) and (45) on the joint (17) side at the same time, By inputting the electric resistance value of the resistance element (44) of the joint (17) to the controller (40), the controller (40) gave the joint (17) a type such as the material, shape, and size of the joint (17). You may make it discriminate | determine by an electrical change.

[0025]

As is apparent from the above-described embodiments, the present invention provides an electric fusion welding apparatus for resin products, in which electric power is supplied to a heating element provided in the resin products to be fusion-bonded to melt the resin at the joint. Depending on the type of fusion-bonded resin product, mechanical changes or electrical changes for product type determination given to the fusion-bonded resin product are read in advance, the heat pattern corresponding to the fusion-bonded resin product is selected and set, and the fusion welding work is performed automatically Since it is equipped with a controller to perform the process, the heat pattern setting (initial setting) based on the type of the resin product to be melted can be automatically and accurately performed, and anyone can handle it and melt the resin product. Can be properly performed.

Further, the terminals to be connected to the terminals at both ends of the electric resistance wire exposed on the surface or the end face of the resin material to be melted, and the mechanical change portion or the electric change portion for determining the kind to be given to the resin material to be melt welded. Since the connector of the controller is provided with the terminal to be connected, the initial setting can be performed by the operation of connecting the connector of the controller to the resin material to be melted without performing a special operation.

[Brief description of drawings]

FIG. 1 is a control circuit diagram.

FIG. 2 is an external view of the entire electric fusion welding apparatus.

FIG. 3 is an explanatory cross-sectional view of a joint portion of a resin product.

FIG. 4 is a connection explanatory view of a heating element and a controller.

FIG. 5 is a heat pattern diagram.

FIG. 6 is a flowchart.

FIG. 7 is a flowchart.

FIG. 8 is a flowchart.

FIG. 9 is an explanatory diagram of a modified example of a resin product type determination unit.

[Explanation of symbols]

 (1) Electric fuser body (15) Connector (17) Joint (resin product) (18) Pipe (resin product) (19) Receptacle (resin product) (20) Electric resistance wire (21) Heating element (24) ) Recess (28) Potentiometer (product type sensor) (34) Temperature sensor (40) Controller (44) Resistance element

Claims (2)

[Claims] 1. An electric fusion welding apparatus for a resin product, which supplies electric power to a heating element provided on the resin to be fused to melt the resin at the joint portion, in advance depending on the kind of the resin to be fused. It is equipped with a controller that reads the mechanical change or electrical change for product type discrimination given to the product, selects and sets the heat pattern corresponding to the resin product to be melted, and automatically performs the melt bonding work. Electric fusion welding equipment for resin products. 2. A terminal to be connected to terminals at both ends of an electric resistance wire exposed on a surface or an end surface of a resin product to be melted, and a mechanical change portion or an electric change portion for determining a kind to be given to the resin product to be melted. The electric fusion welding device for a resin product according to claim 1, wherein the connector of the controller is provided with a terminal to be connected.