JPH10686A - Tube material fusion bonding machine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To easily detect heater faces of heating mechanisms for heating ends of respective tube materials becoming predetermined heating temperatures. SOLUTION: Before a clamping mechanism 20 for a pipe to clamp a pipe 71 in a horizontal state and a clamping mechanism 30 for a tube joint to hold a tube joint 72 in a horizontal state are approached to one another and heated by heating mechanism 40 disposed between the both, surface temperatures of a heater face 42 for the pipe and a heater face 43 for the joint of the mechanisms 40 at retracted positions are detected by a pipe temperature sensor 55 and a tube joint temperature sensor 57 using radiation thermometers, and the faces 42 and 43 become predetermined temperatures. Thereafter, ends of the pipe 71 and joint 72 are respectively engaged with the faces 42 and 43, and heated to molten states.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to, for example, a pipe material fusion splicer used to fuse an end of a synthetic resin pipe and an end of a synthetic resin pipe joint to each other. More specifically, after the outer peripheral surface of the end of the pipe and the inner peripheral surface of the end of the pipe joint are simultaneously heated to a molten state by a heating mechanism, the ends of the pipe and the pipe joint in the molten state are mutually connected. TECHNICAL FIELD The present invention relates to a tube material fusion machine fitted and joined to a pipe.

[0002]

2. Description of the Related Art An outer peripheral surface of an end of a synthetic resin pipe and an inner peripheral surface of an end of a synthetic resin pipe joint are simultaneously heated to a molten state. A tube material fusing machine that fits and fuses each other is disclosed, for example, in Japanese Patent Application Laid-Open No. 6-297852.
Such a fusing machine generally includes a pair of clamp mechanisms that clamp an outer peripheral surface of an end of a pipe and an inner peripheral surface of an end of a pipe joint concentrically so as to be able to approach and separate from each other. And a heating mechanism for simultaneously heating the outer peripheral surface of the end of the pipe and the inner peripheral surface of the pipe joint to bring each of them into a predetermined molten state.

[0003] The heating mechanism provided in the pipe fusion machine is provided with a heater face for pipes and a heater face for pipe joints respectively on opposing surfaces of a flat heater plate. The pipe heater face is for heating an outer peripheral surface of an end portion of a synthetic resin pipe to be fused to a molten state, and has a cylindrical shape so that the end portion of the pipe is inserted. The heater face for a pipe joint heats the inner peripheral surface of the end of the pipe joint to be in a molten state, and has a cylindrical shape so as to be inserted into the pipe joint. The pipe heater face and the pipe joint heater face are each heated by heating the heater plate.

[0004] Such a heating mechanism is configured to be able to retreat from a heating position between the two clamping mechanisms. In a state where the heating mechanism is set to a heating position between the two clamping mechanisms, the heating plate is used. The pipe heater face and the pipe joint heater face are each heated to a predetermined temperature. Then, the pipe and the pipe joint each concentrically clamped by each clamp mechanism approach each other, and the end of the pipe and the end of the pipe joint clamped by each clamp mechanism are connected to the heater face for the pipe and the pipe joint. Each is fitted to a heater face and heated at the same time.

In this way, when the outer peripheral surface of the end of the pipe and the inner peripheral surface of the end of the pipe joint are heated and melted for a predetermined time, the clamp mechanisms are moved away from each other, and the pipe and the pipe are moved away from each other. The pipe joint is separated from the heating mechanism. Then, the heating mechanism is moved to the retreat position. Then, each clamp mechanism is again approached to each other, and the end of the pipe whose outer peripheral surface is in a molten state and the end of the pipe joint whose inner peripheral surface is in a molten state are mutually fitted. The two are fused.

[0006]

In such a tube welding machine, each clamping mechanism can clamp a pipe and a pipe joint having different diameters, and the pipe and the pipe joint are relatively small. It can correspond to various sizes from a large diameter to a large diameter. Also,
The heating mechanism is also changed to one provided with a pipe heater face and a pipe joint heater face of a size corresponding to the diameter of the pipe and the pipe joint to be clamped by the clamp mechanism. However, even when pipes and pipe joints have different diameters, the heating temperature for bringing each end into a molten state is substantially constant.

[0007] The heater plate of the heating mechanism usually has
A thermocouple is provided, and the heater plate is controlled to a predetermined temperature based on the measurement result of the thermocouple. The heater face for the pipe and the heater plate for the pipe joint are heated by the heater plate controlled to a predetermined temperature.

However, the state of heat conduction from the heater plate to each of the pipe heater face and the pipe joint heater face is not constant, and the respective interface depends on the size of the pipe heater face and the pipe joint heater face and the surrounding environment. Are different in heat conduction state. For this purpose, before heating the ends of the pipe and the pipe joint, the respective surface temperatures of the pipe heater face and the pipe joint heater face are measured by a contact-type surface thermometer, and each heater face is determined to have a predetermined temperature. After confirming that the pipes and fittings have been heated to the temperatures described above, each end of the pipes and fittings must be heated. As described above, it is troublesome to manually measure the surface temperature of each heater face before the pipe and the pipe joint are heated, and there is a problem that the working efficiency is poor.

An object of the present invention is to solve such a problem, and an object of the present invention is to provide a tube welding machine capable of setting each heater face in a heating mechanism to a predetermined heating temperature in a short time. It is in.

[0010]

SUMMARY OF THE INVENTION A tube material fusion machine according to the present invention comprises:
A pair of clamp mechanisms configured to clamp a pair of synthetic resin tubes whose ends are joined to each other in a concentric state facing each other so as to be brought into contact with and separated from each other; A pair of heater faces are provided on both sides of the heater plate, and are disposed so as to be able to retreat from between the respective tube materials clamped at each other, and heat the ends of the respective tube materials when the respective tube materials approach. It is characterized by comprising a heating mechanism, and a pair of non-contact type temperature sensors arranged to face each heater face of the heating mechanism.

Each of the temperature sensors is constituted by a radiation thermometer.

[0012]

Embodiments of the present invention will be described below in detail with reference to the drawings.

FIG. 1 is a side view showing an example of an embodiment of a tube fusing machine according to the present invention. This tube material fusion machine uses a truck 1
0 clamp mechanism 2 provided on one side of
0, a pipe joint clamp mechanism 30 provided on the other side of the carriage 10, and a heating mechanism 40 disposed between the clamp mechanisms 20 and 30.

On the center of the carriage 10, a heat insulating chamber 11 is disposed so as to be sandwiched between the pipe clamp mechanism 20 and the pipe joint clamp mechanism 30. The heating mechanism 40 is accommodated in the heat insulating chamber 11. The pipe clamp mechanism 20 and the pipe joint clamp mechanism 30 disposed adjacent to the heat insulating chamber 11 clamp the synthetic resin pipe 71 and the pipe joint 72 in a horizontal state, respectively.

The heat-insulating chamber 11 has a rectangular parallelepiped shape with an open upper surface, and each side and bottom surface is formed of a heat insulating material. The heating mechanism 40 is arranged to be able to move up and down between a retracted position accommodated in the heat insulation chamber 11 and a heating position above the heat insulation chamber 11. The heating mechanism 40 at the heating position above the heat insulating chamber 11 is located between the pipe 71 clamped by the pipe clamp mechanism 20 and the pipe joint 72 clamped by the pipe joint clamp mechanism 30.

The pipe clamp mechanism 20 has a pair of support frames 21 provided vertically on the carriage 10. Each support frame 21 is disposed at an appropriate distance in the horizontal direction between a position close to the heat insulating chamber 11 and a side end position of the carriage 10, and a pair of guide rails 22 is provided between upper end surfaces thereof. However, it is installed horizontally at appropriate intervals in the horizontal direction. In both guide rails 22,
The horizontal slide plate 23 is slidably supported. This slide plate 23 is mounted on each guide rail 2.
By sliding along 2, it comes into contact with and separates from the heat insulating chamber 11.

A slide block 24 is attached to the lower surface of the slide plate 23. The slide block 24 passes between the guide rails 22 and protrudes below the respective guide rails 22. A ball screw 25 parallel to each guide rail 22 is inserted through the lower end of the slide block 24 in a state where the ball screw 25 is screwed. The ball screw 25 is provided horizontally between the upper ends of the support frames 21 at a position slightly lower than the guide rails 22. A reducer 26 is connected to an end of the ball screw 25 on the far side of the heat insulating chamber 11.

Below the speed reducer 26, a pipe positioning motor 27 is provided. The output of the pipe positioning motor 27 is transmitted to a speed reducer 26 via a belt transmission mechanism 28. Belt transmission mechanism 2
The output of the pipe positioning motor 27 transmitted to the speed reducer 26 via 8 is transmitted to the ball screw 25 in a state where the speed is reduced by the speed reducer 26, so that the ball screw 25 rotates forward and reverse. Then, by the forward and reverse rotation of the ball screw 25, the slide plate 23 is
Each of the guide rails 2 is moved toward and away from the heat insulating chamber 11.
Slide 2

On the slide plate 23, a pair of pipe clamps 29 are provided. The pipe clamps 29 are arranged at appropriate intervals in the horizontal direction along each guide rail 22. Clamp for pipes 2
Numeral 9 has a pair of clamp halves separated vertically. Each of the clamp halves is provided with a concave portion in which a square opening is formed so as to abut each other, and the upper clamp half is moved upward, and the lower clamp half is moved upward. The pipe 71 is clamped by fitting the pipe 71 into the recess and fitting the recess of the upper clamp half into the pipe 71. The upper clamp half and the lower clamp half are fastened to each other so that the clamped pipe 71 is held. The pipe 71 clamped by each pipe clamp 29 is held in a horizontal state.

The pipe joint clamp mechanism 30 for holding the pipe joint 72 in a horizontal state is disposed opposite to the pipe clamp mechanism 20 with the heat insulating chamber 11 interposed therebetween. The clamp mechanism 30 for a pipe joint has the same configuration as the clamp mechanism 20 for a pipe except that the clamp mechanism 30 faces the pipe. That is, the slide plate 33 is horizontally slidably supported by the pair of guide rails 32 supported horizontally by the pair of support frames 31, and the pipe joint 72 is placed on the slide plate 33. A pair of pipe fitting clamps 39 for holding the pipe in a horizontal state is provided. A slide block 34 is attached to the lower surface of the slide plate 33, and the slide block 34 is inserted with a ball screw 35 screwed thereto. The rotation of the pipe joint positioning motor 37 is applied to the ball screw 35.
The transmission is performed via a transmission mechanism 38 and a speed reducer 36, and the forward / reverse rotation of the ball screw 35 causes the slide plate 33 to slide so as to be in contact with or separate from the pipe clamp mechanism 20. It has become.

When the length of the pipe joint 72 in the axial direction is short, the pipe joint 72 is held in a horizontal state by one of the clamps 39 disposed close to the heat insulating chamber 11. When the pipe joint 72 is attached to the end of the pipe 71, the pipe joint 72 is held by one of the clamps 39 disposed close to the heat insulation chamber 11, and With the tool 39, the pipe 71 to which the pipe joint 72 is attached is clamped.

A heating mechanism 40 provided between the pipe clamp mechanism 20 and the pipe joint clamp mechanism 30 can move up and down between a standby position accommodated in the heat insulating chamber 11 and a heating position above the heat insulating chamber 11. Heater plate 41
have. The heater plate 41 is provided in a ceramic case and provided with a heater, is configured in a disk shape, and is arranged vertically. At the center of the side surface of the heater plate 41 on the side of the pipe clamp mechanism 20, a cylindrical pipe heater face 42 is provided.
In addition, in the center of the side surface on the side of the clamp mechanism 30 for the pipe joint,
A cylindrical pipe joint heater face 43 is provided.

The end of a synthetic resin pipe 71 to be fused is inserted into the inside of the pipe heater face 42, and the inner peripheral surface thereof is made of a tetrafluoroethylene resin. Coated with a coating film.

The pipe heater face 43 is provided between the heater face 41 for the pipe and the heater face 43 for the pipe joint, which is provided with the heater plate 41 interposed therebetween, and is inserted into the pipe joint 72. Is coated with a coating film made of tetrafluoroethylene resin.

The heater plate 41 has an arm portion 41a extending obliquely downward.

A support 44 extending horizontally into the heat insulating chamber 11 is supported on one side surface of the heat insulating chamber 11 extending in the longitudinal direction of the carriage 10. Rotating shaft 45 that is horizontal along the longitudinal direction of
Are provided rotatably. At the center of the rotating shaft 45, the tip of an arm portion 41a provided on the heater plate 41 is attached, and the entire heater plate 41 is supported by the rotating shaft 45.

Rotary shaft 4 supporting heater plate 41
5 is rotated forward and reverse by a crank mechanism 47. The crank mechanism 47 includes a rotating shaft 45.
A first link 47a connected to one end of the first link 47 and parallel to the arm portion 41a of the heater plate 41, and a second link 47 having an upper end connected to the other end of the first link 47a.
It has a link 47b and a crank wheel 47c having a lower end portion of the second link 47b connected to an outer peripheral portion. The crank wheel 47c is disposed vertically below the inside of the heat insulating chamber 11 along the side surface on the side of the pipe clamping mechanism 20, and the pipe clamping mechanism 2 on the side of the heat insulating chamber 11.
It is configured to be rotated by a lifting / lowering motor 47d arranged in the center.

When the lifting motor 47d is rotated to rotate the crank wheel 47c, the crank wheel 4c
7c is rotated by the second link 47b and the first link 47a.
The heater plate 41 is moved up and down to a heating position above the heat insulating chamber 11 and a retracted position inside the heat insulating chamber 11 by the rotation of the rotary shaft 45.

When the pipe 71 clamped by the pair of clamps 29 and supported in a horizontal state approaches the heater plate 41 raised to the heating position, the pipe clamp mechanism 20 heats the pipe 71. A pipe sensor 51 for detecting the tip on the plate 41 side is provided. The pipe sensor 51 detects that the pipe 71 has approached a position separated by a predetermined distance from the heater plate 41 raised to the heating position. A light-emitting unit and a light-receiving unit are provided at the upper ends of a pair of support rods 52 disposed vertically with the light-emitting unit and the light-receiving unit facing each other.

When the pipe joint 72 clamped by the clamp 39 and supported in a horizontal state approaches the heater plate 41 raised to the heating position, the pipe joint clamping mechanism 30 also has the pipe joint 72. A pipe joint sensor 53 for detecting the end of the heater plate 41 on the heater plate 41 side is provided. The pipe joint sensor 53 also detects that the pipe joint 72 has approached a position separated by a predetermined distance from the heater plate 41 raised to the heating position. A light-emitting unit and a light-receiving unit are provided at the upper ends of a pair of support rods 54 arranged vertically with the moving area therebetween as a transmission-type photoelectric tube.

Further, when the heater plate 41 of the heating mechanism 40 is lowered to the retracted position in the heat insulating chamber 11, the outer peripheral surfaces of the pipe heater face 42 and the pipe joint heater face 43 attached to the heater plate 41 are formed. A non-contact type pipe temperature sensor 55 and a pipe joint temperature sensor 57 are provided along the inner surface of the heat insulating chamber 11 so as to face each other. Pipe temperature sensor 55 and pipe joint temperature sensor 57
Are supported on the upper ends of support rods 56 and 58 provided along one inner side surface of the heat insulating chamber 11, respectively. The pipe temperature sensor 55 and the pipe joint temperature sensor 57 are each configured by a radiation thermometer that measures the temperature based on the emissivity of infrared rays.

The tubing fusion splicer of the present invention having such a structure operates as follows. The pipe 71 to be joined and the pipe joint 72 are fixed to each clamp fixture 29 of the pipe clamp mechanism 20.
The clamp is clamped by the clamp 39 of the clamp mechanism 30 for a pipe joint. As a result, the pipe 71 held horizontally by the clamps 29 of the pipe clamp mechanism 20 and the pipe joint 72 held horizontally by the clamps 39 of the pipe joint clamp mechanism 30 are mutually reciprocated. Is held in a concentric state opposite to.

At this time, the heater plate 41 of the heating mechanism 40 is lowered to the retracted position so as to be located in the heat insulating chamber 11, and the pipe 71 is moved by the pipe clamp mechanism 20 and the pipe joint clamp mechanism 30. When the pipe joint 72 is clamped, the heater plate 41 in the heat insulating chamber 11 is heated. When the heater plate 41 is heated, the pipe heater face 42 and the pipe joint heater face 43 provided on each surface thereof are heated. The surface temperatures of the pipe heater face 42 and the pipe joint heater face 43 are determined by the heat insulation chamber 11.
The pipe temperature sensor 55 and the pipe joint temperature sensor 57 are disposed in close proximity to the pipe heater face 42 and the pipe joint heater face 43, respectively.
, Respectively.

By each of the temperature sensors 55 and 57,
When it is detected that the surface temperatures of the pipe heater face 42 and the pipe joint heater face 43 have reached preset heating temperatures, respectively, the lifting motor 4
7d is driven forward. When the elevating motor 47d is driven to rotate forward, the crank wheel 47c is rotated, and the second
The rotation shaft 4 is formed by the link 47b and the first link 47a.
5 is rotated forward in a predetermined direction. Thereby, the heater plate 41 in which the arm 41a is connected to the rotating shaft 45 is raised. The elevating motor 47d is driven to rotate forward for a predetermined period of time.
When the state is raised to the heating position above the heat insulating chamber 11, the drive of the elevating motor 47d is stopped.

As described above, when the heater plate 41 is set to the heating position above the heat insulating chamber 11, the pipe heater face 42 and the pipe joint heater plate 43, which are concentric, and the pipe clamp mechanism 2
0 and the pipe joint 72 held horizontally by the clamp mechanism 30 for a pipe joint.
Each is concentrically opposed.

In this state, the pipe positioning motor 27 of the pipe clamp mechanism 20 is driven forward at a relatively low speed for a predetermined time, and the pipe joint positioning motor 37 of the pipe joint clamp mechanism 30 is rotated.
Is driven forward at a relatively low speed for a predetermined time.

As a result, the slide plate 23 of the pipe clamp mechanism 20 and the slide plate 33 of the pipe joint clamp mechanism 30 are moved from the heater plate 41 to the heating position.
Each is slid so that it approaches. And
When the tip of the pipe 71 held by the pipe clamp mechanism 20 is detected by the pipe sensor 51 disposed at a position separated from the heater plate 41 by a predetermined distance, the pipe positioning motor 27 operates at a relatively high speed. Is driven forward for a predetermined time. The tip of the pipe joint 72 held by the pipe joint clamp mechanism 30 is
When detected by the pipe joint sensor 53 disposed at a predetermined distance from the heater plate 41, the pipe joint positioning motor 37 is also driven forward at a relatively high speed for a predetermined time.

The pipe positioning motor 27 and the pipe joint positioning motor 37 are connected to the respective distances from the heater plate 41 to the pipe sensor 51 and the pipe joint sensor 53, and the respective rotations of the pipe positioning motor 27 and the pipe joint positioning motor 37. Based on the speed, the respective ends of the pipe 71 and the pipe joint 72 are required to be inserted into the pipe heater face 42 and the pipe joint heater face 43 over a predetermined length. Are determined in advance, and the motor is driven to rotate forward for the determined time.

When the pipe positioning motor 27 and the pipe joint positioning motor 37 are driven to rotate forward for a predetermined period of time, the slid pipe 71 is moved into the pipe heater face 42 heated to a predetermined temperature by the heater plate 41. The fitting interface 43 heated to the predetermined temperature by the heater plate 41 is fitted into the sliding fitting 72 to the predetermined position while being fitted to the predetermined position.

As described above, when the pipe 71 and the pipe joint 72 are fitted to the pipe interface 42 and the pipe joint interface 43 heated to predetermined temperatures by the heater plate 41, respectively, the pipe positioning motor The forward rotation drive of the pipe joint positioning motor 37 is stopped while the forward rotation drive of the tube 27 is stopped.

Thereafter, the heated state of the pipe 71 and the pipe joint 72 is maintained until a predetermined time has elapsed by the timer. During this time, the outer peripheral surface of the distal end of the pipe 71 inserted into the pipe heater face 42 is heated and melted, and the pipe joint heater face 4 is heated.
The inner peripheral surface of the distal end portion of the pipe joint 72 fitted to 3 is heated and brought into a molten state. The outer peripheral surface of the distal end portion of the pipe 71 and the inner peripheral surface of the distal end portion of the pipe joint 72 are heated by the pipe interface 42 and the pipe joint interface 43 heated to predetermined temperatures, respectively, for an equal period of time, so that the same melting occurs. State.

The heating time of the pipe 71 and the pipe joint 72 is set in advance by a timer, and when the set time is detected by the timer, the pipe positioning motor 27 operates at high speed for a predetermined time. The pipe joint positioning motor 37 is driven in reverse.
Is driven in reverse at high speed for a predetermined time. As a result, the pipes 71 each having a molten state at the tip end.
The pipe joint 72 is disengaged from each of the pipe heater face 42 and the pipe joint heater face 43, is separated from each other by a predetermined distance at a high speed, and is set to a predetermined retreat position. You.

As described above, when the pipe 71 and the pipe joint 72 are set to the retracted positions separated from each other, the heating mechanism 4
The zero elevating motor 47d is driven in the reverse direction for a predetermined time, and the heater plate 41 is lowered into the heat insulating chamber 11 to be in a retracted state.

When the heater plate 41 is retracted into the heat insulating chamber 11, the pipe positioning motor 27
Is driven forward at a high speed for a predetermined time, and the fitting positioning motor 37 is similarly driven at a high speed.
The motor is driven for reverse rotation for a predetermined time. As a result, the pipe 71 and the pipe joint 72, each of which has a molten end, are brought closer to each other at a high speed, and the outer peripheral surface is in a molten state inside the distal end of the pipe joint 72 whose inner peripheral surface is molten. The tip of the pipe 71 is fitted.

In such a state, the fitted state of the pipe 71 and the pipe joint 72 is maintained for a predetermined time. As a result, the outer peripheral surface of the tip of the pipe 71 is
2 is fused to the inner peripheral surface of the end, and the pipe 71 is
The clamped state of the pipe clamp mechanism 20 by each clamp 29 is released, and the clamp state of the pipe joint 72 by the clamp 39 of the pipe joint clamp mechanism 30 is released. And the pipes 71 fused to each other
And the pipe joint 72 is removed from the pipe clamp mechanism 20 and the pipe joint clamp mechanism 30.

Thereafter, the pipe positioning motor 27 is driven in reverse for a predetermined time, and the pipe joint positioning motor 37 is driven in reverse for a predetermined time, so that the clamps 29 of the pipe clamp mechanism 20 and the pipe joint clamp mechanism 30 are driven. Are set at predetermined positions where the pipe 71 and the pipe joint 72 are clamped, respectively.

In the above embodiment, the temperature sensors 55 and 57 for detecting the surface temperatures of the pipe heater face 42 and the pipe joint heater face 43 of the heating mechanism 40 and the heater plate 41 are retracted in the heat insulating chamber 11. When it comes to the position, it was configured to be disposed so as to face the outer peripheral surfaces of the pipe heater face 42 and the pipe joint heater face 43. However, the present invention is not limited to such a configuration, and as shown in FIG. When the heater plate 41 is at the heating position above the heat insulating chamber 11, the heater plate 41 may be disposed so as to face the outer peripheral surfaces of the pipe heater face 42 and the pipe joint heater face 43, respectively. In this case, the heating mechanism 40 is set to the heating position,
Before the pipe 71 and the pipe joint 72 are fitted to the pipe heater face 42 and the pipe joint heater face 43, respectively, the respective surface temperatures may be detected.

[0048]

As described above, in the tube welding machine of the present invention, since the temperature of each heater face of the heating mechanism is detected by the non-contact type temperature sensor, each heater face is connected to each clamp mechanism. The optimum heating temperature can be set for each tube material clamped by the above. Therefore, even when the diameter of the tube material to be clamped by each clamp mechanism is changed, the end of each tube material can be heated under optimal heating conditions. In addition, since the temperature of each heater face is detected by each temperature sensor, a special operation for measuring each heater face is not required, and work efficiency is significantly improved.

[Brief description of the drawings]

FIG. 1 is a partially cutaway side view showing an example of an embodiment of a tube material fusion splicer of the present invention.

FIG. 2 is a sectional view taken along line AA of FIG.

FIG. 3 is a cross-sectional view showing another example of the embodiment of the tube material fusion splicer of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 10 Dolly 11 Heat insulation room 20 Pipe clamp mechanism 22 Guide rail 23 Slide plate 24 Slide block 25 Ball screw 27 Pipe positioning motor 29 Clamping tool 30 Pipe joint clamp mechanism 32 Guide rail 33 Slide plate 34 Slide block 35 Ball screw 37 Pipe joint positioning motor 39 Clamping Tool 40 Heating Mechanism 41 Heater Plate 42 Heater Face for Pipe 43 Heater Plate for Fitting 51 Pipe Sensor 52 Support Rod 53 Fitting Sensor 54 Support Rod 55 Temperature Sensor for Pipe 56 Support Rod 57 Temperature Sensor for Fitting 58 Support Rod 71 pipe 72 pipe fitting

Claims (2)

[Claims] 1. A pair of clamp mechanisms configured to clamp a pair of synthetic resin tubes whose end portions are joined to each other in a concentric state facing each other and to move toward and away from each other. And a pair of heater faces for heating the ends of each tube when the respective tubes approach each other are disposed so as to be retractable from between the respective tubes clamped by the respective clamp mechanisms. And a pair of non-contact type temperature sensors disposed so as to face the respective heater faces of the heating mechanism. 2. The tube welding machine according to claim 1, wherein each of the temperature sensors is constituted by a radiation thermometer.