JP2546783B2 - Electric fusion welding equipment - Google Patents

Abstract

PURPOSE:To eliminate failure in electric fusion caused by defective insertion of a pipe. CONSTITUTION:In an electric fusing device, a spigot of a thermoplastic resin pipe 17 is fused to a faucet 18 of a joint 16 by supplying electric current to a heat generating body 20 provided on the inner peripheral face of the faucet 18 of the thermoplastic resin joint 16. In the electric fusing device, there is provided an defective insertion detection means for determining that the spigot of the pipe 17 is not properly inserted into the faucet 18 of the joint 16 when a time where a current value flowing to the heat generating body 20 rises to a set current value exceeds a set time. When the detecting means detects a defective insertion of the pipe 17, the supply of the current to the heat generating body 20 is interrupted.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a pipe opening made of a thermoplastic resin for receiving a joint of a thermoplastic resin by supplying an electric current to a heating element provided on an inner peripheral surface of the joint. The present invention relates to an electric fusing device for fusing.

[0002]

2. Description of the Related Art In this kind of fusion welding work,
For heat pattern according to product type such as material, shape and size
Based on the
Work is being done.

[0003]

[Problems to be Solved by the Invention] However,
Even when supplying the selected and set current, for example,
Improper insertion of the pipe into the mouth of the hand, or defective control device.
Good or due to various factors such as heater error,
The time required for the current value to rise to the set current value is
It may exceed the interval. Emitted under such working conditions
The heating element is not adequately supplied with the required current.
However, if fusion welding failure occurs and it is easy to separate after fusion welding,
I have a problem.

[0004]

SUMMARY OF THE INVENTION However, according to the present invention, by supplying an electric current to a heating element provided on the inner peripheral surface of the receiving end of a joint made of a thermoplastic resin, a pipe made of a thermoplastic resin is received at the receiving end of the joint. In an electric fusing device for fusing and welding the insertion hole, a higher level than the lower set current value in the heating element is used.
Heat detection means for detecting the rise time up to the set current value of
To control the heat generation of the heating element by changing the rise time.
Up to the set current value of the current supplied to the heating element.
When the rise time of exceeds the set time,
Poor tube insertion into the receiving port, or defective control device,
Or by a variety of factors such as product error of the heater, heating element
It was determined that the current required for
The welding work is interrupted and the work is continued.
If it is performed, the occurrence of defective welding will be prevented.
Therefore, it is possible to improve the efficiency and accuracy of this fusion welding work.
Wear.

[0005]

Embodiments of the present invention will be described below in detail with reference to the drawings. FIG. 1 is a heat pattern diagram, and FIG. 2 is an explanatory view of an electric fusion welding operation. In FIG. 2, reference numeral (1) denotes a controller for electric fusion wearing, and a start button (3) and a stop are provided on the upper surface of a main body case (2). A button (4) and a liquid crystal display (5) are provided, a plug (6) for connecting to a power supply is provided at a tip thereof, and a power cord (7) and a connector (8) connected to an end face of a thermoplastic resin opening. A control code (9) provided at the end extends from the main body case (2).

As shown in FIG. 3, the main body case (2)
Is a rectangular box-shaped hermetically sealed structure including a side plate (10) having a rectangular frame shape, a top plate (11) closing the upper surface of the side plate (10), and a bottom plate (12) closing the lower surface of the side plate (10). Aluminum, which prevents water from entering the inside of the main body case (2) in which various electric and electronic parts and wiring boards on which they are mounted are arranged, and which is excellent in heat dissipation of the bottom plate (12). And the like, and a large number of heat dissipation blades (13) are integrally formed on the lower surface side of the bottom plate (12), and the bottom plate (12) is used as a heat dissipation plate to suppress the temperature rise inside the main case (2). Protects various electric and electronic parts from heat, and attaches a power control element (14) or the like, which has a high temperature during operation, to the bottom plate (12) in close contact with the bracket (15) to obtain a high temperature rise suppressing effect. Is configured as

In FIG. 2, reference numeral (16) denotes a joint made of a thermoplastic resin, and reference numeral (17) denotes the joint (16).
This is a tube made of a thermoplastic resin of the same material.

As shown in FIG. 4, the inner peripheral surface of each receiving port (18) of the joint (16) into which the insertion port of the pipe (17) is inserted is provided with a folded electric resistance wire (19) on a cylindrical surface. (20) Heating element formed into a sleeve shape by spirally winding along it
However, terminal pins (21) and (21) attached to both ends of the electric resistance wire (19) protrude from the end face of each of the receptacles (18) and are fixed by insert molding in advance.

The electric resistance wire (19) is obtained by forming an insulation coating on a resistance electric wire such as a nickel wire with a thermoplastic resin of the same material as the joint (16).

In addition, between the terminal pins (21) and (21) at the end face of each of the receptacles (18), a concave portion for discriminating the kind, which has a different depth depending on the kind, such as the material, shape and size of the joint (16). (22) is formed.

As shown in FIG. 5, fixed terminals (23) and (23) for inserting and connecting the terminal pins (21) and (21) are embedded in the connection end surface of the connector (8), and fixed terminals (23). ) And (23) through the recesses (2).
A movable terminal (25), which is a sensor arm having a tip portion inserted into 2), is slidably projected.

A potentiometer type sensor (26) is provided inside the connector (8),
The movable terminal (25) inside the connector (8) is formed with a rack gear (28) that is always engaged with the pinion gear (27) of the type sensor (26), and is connected to each terminal pin (21) (21) of the receptacle (18). When the respective fixed terminals (23) and (23) of (8) are connected, the receptacle (1)
The movable terminal (2) of the connector (8) is placed in the concave portion (22) of (8).
5) is connected and the moving amount of the movable terminal (25) is detected by the product type sensor (26).
It is configured to determine the product type of 5).

The movable terminal (25) is connected to a spring (29) for elastically pressing the movable terminal (25) in a projecting direction and a mounting bracket (30) of the product type sensor (26) to regulate the projecting amount of the movable terminal (25). The movable terminal (25) is positioned at the reference position of the type sensor (26) by the stopper (31).

In addition, the movable terminal (25) is formed in a cylindrical shaft shape, and a cylindrical shaft-shaped sensor case (32) is detachably inserted and fixed in the movable terminal (25). The temperature sensor (33), which is a thermistor, is attached to the tip of the movable terminal (2), and the tip of the temperature sensor (33) is exposed to the tip of the movable terminal (25).
When 5) is connected to the recess (22), the recess (2)
2) The tip surface of the temperature sensor (33) is brought into contact with the bottom surface to detect the temperature (outside air temperature) of the joint (16) at the time of starting the electric fusion welding operation.

The control code (9) having the connector (8) attached at the tip thereof includes a power supply cord connected to the fixed terminals (23) and (23) and a kind signal transmission code connected to the kind sensor (26). And a temperature signal transmission cord connected to the temperature sensor (33) is connected to a CPU (34) provided in the controller (1).

As shown in FIG. 6, the controller (1)
A CPU (34) constituted by a microcomputer, and the CPU (34) is provided with the start button (3).
And a stop button (4) and the type sensor (26)
A temperature sensor (33), the heating element (20), the display (5), and a memory (35) for storing a heat pattern are connected to each other, and a current is supplied to the heating element (20) based on the heat pattern. Of the pipe (17) is electrically fused to the receptacle (18) of the joint (16).

The memory (35) stores a heat pattern for each type of the joint (16). As is clear from the heat pattern diagram of FIG. ) Electric resistance wire (1
9) shows the relationship between the current value (A) to flow in (9) and time (S). The current starts to flow from the start of the electrofusion operation, and the current value (A) is first raised to a first set current value (A1). The first set current value (A1) is maintained for a first time (S1).
Next, the current value (A) is increased to a second set current value (A2), and the second set current value (A2) is increased for a second time (S2).
2) Keep. Next, the current value (A) is increased to a fifth set current value (A5) which is the maximum current value, and the fifth set current value (A5) is maintained for a third time (S3). Next, the current value (A) is decreased to a third current value (A3),
Current value (A3) for a fourth time (S4),
After the elapse of the time (S4), the current supply is cut off.

The fourth current value (S4) is the current value for heating the thermoplastic resin, which is the molding material for the insulating film of the joint (16), the pipe (17) and the electric resistance wire (19), to this melting temperature. And the first to third set current values (A
1) (A2) (A3) is the fourth set current value (A4)
While setting it lower, the fifth set current value (A5) is set higher than the fourth set current value (A4), and A1 <A
2 <A3 <A4 <A5 is set, and a period from the start of the electric welding operation until the second set time (S2) elapses is a drying step, and the heating element (2
0) evaporating the water adhered to the inner peripheral surface of the receiving port (18) of the joint (16) and the outer peripheral surface of the insertion port of the pipe (17) by the amount of heat generated from the heating step, thereby drying the surface of the resin to be melted; A period until the third set time (S3) elapses from the end is defined as a melting step, and the amount of heat generated from the heating element (20) in this melting step is used as the inner peripheral surface of the receiving port (18) of the joint (16) and the pipe ( 17) Melting the insulating film on the outer peripheral surface of the insertion opening and the electric resistance wire (19), and the fixing process is performed until the fourth set time (S4) elapses after the completion of the melting process. , The molten resin is gradually solidified in a stable state by the amount of heat generated from the heating element (20).

Thus, as shown in FIG. 2, the controller (1) is brought into the piping site, and the plug (6) at the end of the power cord (7) is connected to a power source such as a generator provided at the piping site. At the same time, the terminal pin (2) on the end face of the receptacle (18) of the joint (16) into which the insertion port of the pipe (17) is inserted.
After connecting the fixed terminals (23) and (23) and the movable terminal (25) of the connector (8) at the end of the control cord (9) of the controller (1) to the controller (1) (21) and the recess (22), By turning on the start button (3) of (1), the socket (1) of the joint (16) is
8) and the automatic control to automatically fuse the mouth of the pipe (17) is started. As shown in the heat pattern diagram of FIG. 1 and the flowchart of FIG. 7, the start button (3) is When turned on, first, the output values of the product type sensor (26) and the temperature sensor (33) are read, the product type of the joint (16) is determined based on the output values of the product type sensor (26), and the product type is selected. Heat pattern selection setting control (initial setting) of reading the corresponding heat pattern from the memory (35) is performed. After that, the drying control, the melting control, and the fixing control for controlling the current flowing through the heating element (20) are performed based on the heat pattern that is selectively set, and the electric fusion deposition is completed.

As shown in the flowchart of FIG. 8, in the melting control, the output value (t
When a) is within the set range (for example, 10 ° C to 30 ° C), the heating element (2
0) is controlled, but when the outside air temperature at the work site is high, the resin temperature rises quickly, and when it is low, the rise of the resin temperature becomes slow.
When the output value (ta) of 3) is higher than the set range, the third set time (S3) of the heat pattern corresponding to the difference.
Is shortened, and conversely, if it is low, the heat pattern is corrected so as to increase the third set time (S3) of the heat pattern in accordance with the difference, and thereafter, the heating element based on the corrected heat pattern The current flowing to (20) is controlled.

Further, a socket (18) of the joint (16)
If the opening of the pipe (17) is not properly inserted into the tube, the amount of heat transferred from the heating element (20) to the resin is small, and the temperature of the heating element (20) rises quickly, and the temperature rises. Then, while the electric resistance increases, on the other hand, when inserted properly, the amount of heat transmitted to the resin is large, and the temperature rise of the heating element (20) is delayed. Then, the fact that the rising time of the current value flowing through the heating element (20) changes due to this characteristic is used to detect the defective insertion of the pipe (17), and it flows into the heating element (20) from the start of melting control. When the current value (Ax) rises to the set current value (A0) set lower than the fourth set current value (A4) of the heat pattern within the set time (S0), the pipe (17) is properly inserted. And the controller and heater etc. operate normally.
When the rising time exceeds the set time (S0), the pipe (17) is turned on while the electric fusion welding work is performed by continuing to supply the electric current to the heating element (20). If it is not inserted properly , or if it is in a control device, heater, etc.
It is judged that an abnormality has occurred, and the supply of electric current to the heating element (20) is relayed, and at the same time, the display (5) displays a defective welding such as a defective insertion of the pipe (17), and the electric fusion welding operation is performed. It is interrupted before the resin is melted, and prevents the pipe (17) from being melted and adhered to the joint (16) due to poor insertion or the like .

[0022]

As is apparent from the above embodiments, the present invention is directed to a socket (18) of a joint (16) made of a thermoplastic resin.
An electric fusion welding in which an electric current is supplied to a heating element (20) provided on an inner peripheral surface of the pipe (17) made of a thermoplastic resin to be fused to a receiving port (18) of the joint (16). In the device, a low setting in the heating element (20)
Stand up to a higher set current value (A0) than the current value (A2)
Providing heat generation detection means to detect rise time,
The heat generation of the heating element (20) is controlled by the change.
Therefore, the set current value of the current supplied to the heating element (20)
Rise time to (A0) exceeds set time (SO)
When in the state, for the socket (18) of the joint (16)
Poor insertion of pipe (17), defective control device, or
Due to various factors such as heater product error, the heating element (2
The current required for 0) does not flow properly
Therefore, the fusion welding work is interrupted and the work is continued.
If there is a problem with welding, it is possible to prevent problems such as defective fusion adhesion.
It is possible to improve the efficiency and accuracy of the fusion welding work of
It has a remarkable effect.

[Brief description of drawings]

FIG. 1 is a heat pattern diagram.

FIG. 2 is an explanatory view of electric fusion welding work.

FIG. 3 is a sectional view of a controller.

FIG. 4 is a cross-sectional view of a joint receiving port.

FIG. 5 is a sectional view of the connector.

FIG. 6 is an electric fusion control circuit diagram.

FIG. 7 is a flowchart of the entire control.

FIG. 8 is a flowchart of melting control.

[Explanation of symbols]

 (1) Controller (16) Joint (17) Pipe (18) Receptacle (20) Heating element

Claims (1)

(57) [Claims] 1. An electric fusion system in which an electric current is supplied to a heating element provided on an inner peripheral surface of a receiving port of a thermoplastic resin joint so as to melt and attach an end of a thermoplastic resin tube to the receiving port of the joint. in wearing device, the low in the heating element
Rise time up to the set current value higher than the set current value is detected.
By providing a heat generation detector that emits heat,
An electric fusion welding apparatus characterized in that heat generation of a heating element is controlled .