JPH08258155A - Electric fusion bonding apparatus for resin product - Google Patents

Abstract

PURPOSE: To improve the fusion bonding accuracy of a joint to a tube on the basis of a heat pattern corresponding to the type by automatically discriminating the type of the joint. CONSTITUTION: An electric fusion bonding apparatus for the connecting surface to a resin tube, which supplies power to a heater embedded in a resin joint and connects it to the receptacle of the joint, comprises a heat pattern selecting recess to allow a movable terminal for discriminating the type of the joint to telescopically protrude to a connector 15 and to engage the movable terminal along the axial central direction of the tube at the end face of the receptacle of the joint, and correcting means for detecting the maximum energy from the start of fusion bonding at a time difference at a controller 40 to correct the heat pattern set on the basis of the energy and the difference.

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 However, according to the present invention, the two terminals at both ends of the heating element embedded in the resin joint are connected to the fixed terminals protruding from the connector of the controller to supply power to the heating element. , In the electric fusion welding equipment for resin products, which is designed to perform the electric fusion of the joint surface with the resin pipe that is connected to the receiving port of the joint, the movable terminal for distinguishing the joint type is projected to the connector And a recess for heat pattern selection for engaging the power supply female terminal for connecting the fixed terminal and the movable terminal is provided along the axial direction of the pipe at the receiving end face of the joint, and the fusion welding work is performed. The controller is provided with correction means for detecting the maximum amount of power from the start with a time difference, and is configured to correct the heat pattern set based on the maximum amount of power and the time difference.

[0005]

[Operation] Therefore, according to the present invention, an automatic fusion welding operation is performed based on a heat pattern corresponding to a product type such as a joint material shape and size preset in the controller.
When connecting the connector, the movable terminals are automatically engaged in the recesses to identify the product type and select an appropriate heat pattern to enable fusion welding that properly addresses the product type. In this case, connect the fixed terminal in particular. By providing a recess for engaging the terminal and the movable terminal on the joint end face in the axial direction of the pipe, the axial center of the pipe can be connected even in a narrow space such as between houses or other installations. It is possible to perform good work without hindrance along with excellent handling and maintain a simple appearance structure that does not cause these terminals and recesses to protrude outward even after connection and maintain them. Durability, etc. can be improved, and the gap between the joint and the pipe can be detected from the maximum amount of electric power from the start of fusion welding work and its time, and the heat pattern can be automatically corrected according to this gap to create a gap. Large of It is always free from being affected one which enables stable high-precision melt adhesive work.

[0006]

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 a connecting cord (16) having a connector (15) for connecting to a terminal of the joint at a tip thereof extend 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 and thickness of the electric resistance wire (20) and the electric resistance are appropriately selected according to the material such as the material, shape and size of the joint (17).

Further, the respective receiving ports (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 projected. A movable terminal (27) inserted into the recess (24) is projected from between.

Further, a potentiometer (28) which is 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.

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 having the connector (15) attached at its 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 are 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.

The amount of heat generated by the heating element (21) according to the first set current value (A1) is used to set the joint (17) and the pipe (1).
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.

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 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 resin temperature rises slowly, the temperature sensor (3
4) The heat pattern is also corrected based on the output.

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.

[0024]

As is apparent from the above embodiments, according to the present invention, the two terminals (22) and (23) at both ends of the heating element (21) embedded in the resin joint (17) are connected to the controller (4).
Fixed terminal (2) protruding from the connector (15)
5) To supply electric power to the heating element (21) by connecting (26), and to perform electric fusion of the joint surface with the resin pipe (18) connected to the socket (19) of the joint (17). In the electric fusion welding apparatus for resin products, the movable terminal (27) for discriminating the type of the joint (17) is projectably provided in the connector (15) so as to be retractable, and the fixed terminals (25) and (26) are connected. A recess (24) for selecting a heat pattern for engaging the female terminals (22) (23) for supplying power and the movable terminal (27) is provided with a pipe (1) at the end face of the socket (19) of the joint (17).
8) Along with the axial direction, the controller (40) is provided with a correction means for detecting the maximum amount of electric power from the start of the welding operation with a time difference, and the heat set based on the maximum amount of electric power and the time difference. Since it is configured to correct the pattern, it is possible to perform an automatic welding operation based on the heat pattern corresponding to the type such as the material shape and size of the joint (17) preset in the controller (40). , When the connector (15) is connected, the movable terminal (27) is automatically engaged with the recessed portion (24) to select an appropriate heat pattern, thereby enabling fusion welding in which the product type is appropriately dealt with. Yes, especially in this case the fixed terminal (2
5) The recesses (24) for engaging the terminals (22) (23) for connecting the (26) and the movable terminal (27) are provided with the joint (17).
The end face is provided along the axial direction of the pipe (18), and even in the connection in a small space such as between houses or other installations, there is no problem along the axial center of the pipe. Maintains a simple appearance structure that allows work to be performed and is excellent in handleability, and does not cause the terminals (22) (23) and the recesses (24) to protrude outward even after connection to cause an obstacle. Maintenance and durability can be improved by detecting the gap between the joint (17) and the pipe (18) from the maximum amount of electric power from the start of fusion welding work and its time. Accordingly, the heat pattern is automatically corrected, and it is possible to perform a stable and highly accurate fusion welding operation without being affected by the size of the gap, which is a remarkable effect.

[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]

 (15) Connector (17) Joint (18) Pipe (19) Receptacle (21) Heating element (22) (23) Terminal (24) Recess (25) (26) Terminal (40) Controller

Claims (1)

[Claims] 1. A resin-made joint for supplying electric power to a heating element by connecting fixed terminals projecting from a connector of a controller to two terminals at both ends of the heating element embedded in a resin-made coupling, and connecting to a socket of the coupling. In an electric fusion welding device for resin products, which is designed to perform electric fusion of the joint surface with a pipe, a movable terminal that determines the type of joint is projected in a connector so that it can be retracted, and a power supply that connects the fixed terminal A recess for heat pattern selection that engages the female terminal and movable terminal for use is provided along the axial direction of the pipe at the receiving end surface of the joint, and the maximum amount of power from the start of fusion welding work is detected with a time difference. An electric fusion welding apparatus for resin products, characterized in that the controller is provided with a correcting means for correcting the heat pattern set based on the maximum electric energy and the time difference.