JPH1177834A - Welding machine for thermoplastic resin piping material - Google Patents

Abstract

PROBLEM TO BE SOLVED: To always accurately weld piping materials mutually by reducing a slide speed so that the pressing force of a welding surface to a heating element is brought to a prescribed value by a control means when it is detected that the piping materials slide to an abutting preparation position thereof relatively. SOLUTION: Fixed clamps 3, 4 clamp piping materials P1, P2 by hydraulic cylinders and the clamp 4 advances and retreats in the direction of the clamp 3 to stop. Respective positions, that is, an abutting position, a heating position, a cutting feed end, a cutting position and a retreat end are detected by a sensor constituted of the proximity switch fixed to the fixing plate provided to a stand 2 and the permanent magnet of the support plate fixed to the side surface of the clamp 4. A control apparatus controls oil pressure predetermined at every kind and caliber of the piping materials to a predetermined value when it is detected that the clamp 4 reaches the abutting preparation position and adjusts the oil pressure of the cylinder to perform the changeover of the low and high speeds of a slide and the changeover of the low and high pressures of pressing force.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a welding machine for thermoplastic resin piping.

[0002]

2. Description of the Related Art A conventional fusion splicer for thermoplastic resin piping is
Normally, the fused surface is thinly cut in advance using a cutting device or the like,
Remove the oxide film on the surface and, if necessary, remove the oil on the surface with a cloth soaked in acetone.
An interval for allowing a heating element such as a heater plate or a heater face to be inserted is opened, and clamps provided on a gantry are held so that the fusion surfaces face each other.

[0003] Then, after the heating element is supported by a support member provided between the clamps of the gantry, both clamps are relatively slid in the direction of the support member so that the pipe member is placed on both sides of the heating element. The fusion surface is pressed and the fusion surface is heated and melted by the heat of the heater.

[0004] Next, when the fusion surface is melted, the clamp is slid in the opposite direction to remove the heating element from between the pipe members, and then the clamp is slid again in the other clamp direction. The contact surfaces are directly butted and fused at a predetermined pressure (JP-A-6-8331).
JP-A-9-85828, etc.).

In the fusing machine disclosed in Japanese Patent Application Laid-Open No. 2-101718, the driving means for sliding the clamp can be manually switched between low-speed driving and high-speed driving. When fitting the tube and fitting to the heater face as a low speed drive,
When the fusion surface is melted by the heater face, the fitting is released by quickly pulling it out at a high speed to release the fitting, and then the pipe and the fitting are fitted again and fused.

[0006] That is, in this fusion machine, the connection with the heater face is quickly pulled out to prevent the resin from being biased, and to obtain a constant joining quality at the time of subsequent joining.

However, in the above-mentioned fusing machine, the low-speed drive and the high-speed drive are manually performed, so that the switching from the low-speed to the high-speed or the high-speed to the low-speed during the slide of the clamp can be accurately performed. Can't do it. Therefore, after the fusion surface is melted, the joining of the pipe members to each other must be performed in a high-speed driving state, and there is a problem particularly in butt fusion.

That is, in the case of butt fusion, the pipe end faces of the pipe material are brought into contact with each other and fused, so that the fused pipe end face, that is, the fusion face is made as described above. When butted at a high speed, the resin portion melted by the impact at the time of the butting escapes to the outside, and the unmelted portions may be abutted to make it impossible to join them properly.

[0009]

SUMMARY OF THE INVENTION In view of the foregoing, it is an object of the present invention to provide a thermoplastic resin piping material which can always accurately and accurately fuse a piping material to a piping material even in butt welding. The purpose is to provide a fusion machine.

[0010]

According to the first aspect of the present invention, there is provided a welding machine for a thermoplastic resin piping material (hereinafter referred to as "a first aspect of the invention").
In order to achieve such an object, two clamps for holding two pipe members to be fused so that their fusion surfaces face each other, and a clamp between the clamps are used. A heating element that is detachable at the heating and melting position, and the driving unit slides the two clamps and the heating element relatively to each other to move the fusion surface of the pipe material gripped by the clamp to the heating element. After pressing and melting against the heating surface, both clamps are slid relatively to each other in the opposite direction to release the heating body, and the pipe material gripped by both clamps is again slid relatively to the fused surface in a molten state. In a thermoplastic resin pipe material fusing machine adapted to fuse both pipe materials by abutting each other, the control means of the driving means and the two pipe materials relatively slide to a butting preparation position immediately before the butting position. Pier detecting When the sensor detects that both pipe members have slid to the butting preparation position, the control means determines in advance the pressing force of the driving means on the heating body of the fusion surface by the type of both pipe materials, The pressure is automatically switched to the pressing force set for each caliber, and the sliding speed is reduced.

Further, the fusing machine according to claim 1 includes a heating position sensor for detecting that the fusing surface of the pipe member is close to the heating surface of the heating element, and the control means includes: The pressing force of the driving means is automatically switched to the pressing force at the time of melting, which is set in advance for each type and diameter of the two pipe members, or gripped by two clamps as in claim 3. Cutting means or polishing means that can be freely mounted between the pipe materials, slide relatively with both clamps, and the pipe end face of the pipe material is pressed to cut or polish the pipe end face to expose the fused surface. A cutting position sensor or a polishing position sensor for detecting that the pipe end surface of the pipe material is close to the cutting or polishing position, and the control means is configured to set the cutting means or the polishing means set in advance for each type of the pipe material and for each diameter. The pressure on the means It is preferred that is as a switched manner.

In the above configuration, although not particularly limited,
The process of mounting the heater plate or heater face to the mounting position, the process of sliding the clamp in the direction in which both piping materials approach and pressing the fusion surface of the piping material against the heating surface of the heater plate or heater face, respectively. After melting, slide the clamp in the direction in which both pipes separate, then remove the heater plate or heater face from between the two pipes, and slide the clamp again until the end faces of both pipes abut. Thus, it is preferable that the step of press-contacting at a predetermined pressure and fusing both pipe members can be automatically performed.

The heating element is not particularly limited as long as it has a surface on both sides capable of heating and melting the fusion surface of both pipe members, and examples thereof include a heater plate and a heater face. A method of relatively sliding the two clamps and the heating element relative to each other includes a method in which the heating element is supported by a support member fixed on a gantry to be in a fixed state, and the two clamps are slid toward the support member from both sides. , One of the clamps is fixed, and the support member and the other clamp are slid toward the one clamp.

The material of the pipe material that can be fused by the fusion machine of the present invention is not particularly limited as long as it can be thermally fused, and examples thereof include polyvinyl chloride, polyethylene, polypropylene, and polyvinylidene fluoride. . The shape of the pipe material that can be fused by the fusion machine of the present invention is not particularly limited, and examples thereof include a combination of a straight pipe and a straight pipe, a receiving pipe and a short pipe, and a cheese and cheese.

Although the driving means is not particularly limited,
For example, a pneumatic cylinder and a hydraulic cylinder are mentioned, but a hydraulic cylinder is preferable in consideration of accuracy such as speed control. As a sensor, other than a butting position sensor, a cutting position sensor or a polishing position sensor, another sensor such as a retreat end sensor for detecting the retreat end of the clamp may be provided.

The type of sensor is not particularly limited, and examples thereof include a combination of a proximity switch and a permanent magnet. Further, the position of the sensor may be fixed, but it is preferable that the detection position can be adjusted by sliding the sensor in the sliding direction of the clamp. The adjustment width of the detection position of the sensor is not particularly limited, but is preferably about 0.1 mm to 50 mm.

[0017]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the present invention will be described below.
The details will be described with reference to the drawings. FIG. 1 to FIG. 4 show an embodiment of a welding machine for thermoplastic resin piping material according to the present invention.

As shown in FIGS. 1 and 2, this thermoplastic resin pipe material fusing machine (hereinafter, simply referred to as "fusing machine").
1 is a gantry 2, a fixed clamp 3, and a movable clamp 4.
And a cutting device 5 as a cutting means, and a heating and melting device 6
, A support 7, an operation panel 8, and a hydraulic unit 9. The fixed clamp 3 is fixed on the gantry 2 and can hold one of the pipe members P1 to be fused.

As shown in FIG. 1, the movable clamp 4 can hold the other pipe material P2 to be fused, and the hydraulic cylinder 41 connected to the hydraulic unit 9 as shown in FIG. Thereby, the rails 21 and 21 provided on the gantry 2 advance and retreat in the direction of the fixed clamp 3. That is, the hydraulic cylinder 41 is configured to advance and retreat and stop by switching the switching valve 91 to any one of the normal rotation position, the reverse rotation position, and the neutral position, and to operate the operating means 8 provided in the operation panel 8.
The solenoid valve provided in the relief circuit 92 is opened / closed by the signal from 1 to adjust the oil pressure, and it is possible to switch between low speed and high speed or to switch the pressing force between low pressure and high pressure.

As shown in FIGS. 2, 3 and 5, the cutting device 5 is slidably supported on rails 22, 22 provided in parallel with the rails 21, 21 of the movable clamp 4. A base 51, a disk-shaped cutter plate 52 having blades 52 a provided on both sides, and an arm 5 rotatably supported by the base 51 to rotatably support the cutter plate 52.
3, a motor 54 fixed on the arm 53 for driving the cutter plate 52 to rotate, and a hydraulic cylinder 55 for driving the arm 53 to rotate about its pivot shaft.

The arm 53 has locking claws 53a, 53a which engage with locking grooves 71 of the support 7 described later.

The heating and melting device 6 is shown in FIGS.
As shown in FIG. 7, a base 61 slidably supported on the same rail 22 as the cutting device 5, a heater plate 62 as a heating body main body and a heater plate 62 are supported and pivotally supported on the base 61 so as to be rotatable. Heating body 6a composed of arm 63
And a hydraulic cylinder 64 that rotationally drives an arm 63 as a support member mounting portion around a pivot shaft thereof.

Although not shown, the heater plate 62 has a temperature sensor provided therein. The temperature sensor measures the temperature of the heater plate 62 and sends the result to the control means 81 of the operation panel 8. It has become.

The arm 63 is provided with locking claws 63a, 63a which engage with locking grooves 71 of the support 7 described later. Further, the cutting device 5 and the heating / melting device 6 are configured to slide along a rail 22 to a cutting position or a heating / melting position, respectively, by a pneumatic cylinder (not shown) as a driving means.

The support 7 is, as shown in FIG.
Support rails 2 provided in parallel outside 1, 21
When the movable clamp 4 is slid by the hydraulic cylinder 41 while being slidably supported by the movable clamp 4 and the movable clamp 4 via the link 72, the movable clamp 4 is simultaneously slidably supported in the same direction as the movable clamp 4. 4 and is slidable with a movable width of about 1/2.

The support 7 is provided with support columns 74 at both ends.
And the engaging claw 53a, 53a of the cutting device 5 or the engaging claw 63a, 63a of the heating / melting device 6 is engaged with the engaging groove 71 provided at the upper end of the support column 74 when it comes to the mounting position. It is supposed to.

Further, the fusion splicer 1 is similar to that shown in FIGS.
As shown in the figure, the butting position sensor S1, the heating position sensor S2, the cutting feed end sensor S3, and the cutting position sensor S
4. A retreat end sensor S5 is provided.

Each of the sensors S1 to S5 is shown in FIGS.
As shown, the proximity switch S₁₁, S_{twenty one}, S₃₁, S₄₁, S₅₁
And permanent magnet S₁₂, S_{twenty two}, S₃₂, S₄₂, S₅₂And composed from
The proximity switch S₁₁, S_{twenty one}, S₃₁, S₄₁, S₅₁
Fixing plate provided so that it rises from the gantry 2
28, a permanent magnet S₁₂,
S _{twenty two}, S₃₂, S₄₂, S₅₂Is fixed to the side of the movable clamp 4.
The corresponding proximity switch S of the defined support plate 42
₁₁(Or S_{twenty one}, S₃₁, S₄₁, S₅₁At the same height as
Can slide into the long holes 43 ... 43 provided
It is fixedly supported.

The long hole 43 has a width of 50 mm and is
Hisaku magnet S₁₂, S_{twenty two}, S₃₂, S₄₂, S ₅₂The given slide
By sliding it into position and fixing it, the sensor
The detection position can be adjusted. The operation panel 8
The control means 81 is provided as described above.
However, the position of the movable clamp 4 is at a predetermined position in each sensor.
Is detected, the hydraulic pressure of the hydraulic cylinder 41 is adjusted in advance.
Switch to the hydraulic pressure and slide the movable clamp 4
Speed and pressing force of hydraulic cylinder 41
It is supposed to.

The operation of the fusing machine 1 will be described below in the order of working steps. A. Preparation Step The power (not shown) of the heater plate 62 provided on the operation panel 8 is turned on, and the heater plate 62 is heated and heated.

Fixed clamp 3 and movable clamp 4
Are gripped so that the fusion surfaces face each other. Each of the permanent magnets S ₁₂ , S ₂₂ , S is set so that the detection position is determined according to the type and diameter of the pipe materials P 1, P 2 to be fused.
₃₂ , S ₄₂ and S ₅₂ are slid along the long hole 43.

B. Cutting Step A switch (not shown) for starting cutting of the operation panel 8 is turned on, and the pipe end faces of both the pipe members P1 and P2 are cut. That is, when the switch for starting cutting is turned on, the cutting device 5 moves to the position of the support base 7, and then the hydraulic cylinder 55 operates to rotate the arm 54, and the locking claw 53 of the cutting device 5 is moved.
a, 53a are engaged with the locking grooves 71, 71 of the support base 7, and the cutter plate 52 is supported by the support base 7.

The movable clamp 4 slides toward the fixed clamp 3 by the hydraulic cylinder 41 with the relief circuit 92 closed while the cutter plate 52 is driven to rotate by the motor 54. That is, it slides at high pressure and high speed. Next, the permanent magnet S ₄₂ of the cutting position sensor S4 that slides with the movable clamp 4.
Press but reaches far corresponding proximity switch S _41, the required hydraulic pressure applied to the hydraulic cylinder 41 the control unit 81 receives the signal by operating the solenoid valve of the relief circuit 92 opens the relief circuit 92 to the cutting Reduce to pressure.

Then, the cutting proceeds, and the permanent magnet S of the cutting feed end sensor S3 that slides with the movable clamp 4.
₃₂ When reaches the place of the corresponding proximity switch S _31,
In response to the signal, the control means 81 switches the switching valve 91 to the neutral position and sets the pressing force of the hydraulic cylinder 41 to zero. That is, when the pipe end surfaces of the pipe members P1 and P2 pressed against the cutter plate 52 are cut by pressing, and a surface without oxidation is exposed as a fusion surface, it is prevented from being cut further.

Next, the control means 81 sets the switching valve 91 to
Switching to the reverse rotation position,
Activate the magnetic valve to close the relief circuit 92
The movable clamp 4 is driven by driving the hydraulic cylinder 41 in the reverse direction.
Slide at high speed in the reverse direction. And the movable clan
Permanent magnet of the retraction sensor S5 that slides with the
S ₅₂The corresponding proximity switch S₅₁Control
The means 81 receives the signal and sets the switching valve 91 to the neutral position.
And the movable clamp 4 is stopped.

Next, the rotation of the cutter plate 52 stops, and the arm 53 is pulled up. If necessary, the cut surface, that is, the fused surface is wiped with a cloth or paper towel soaked with acetone to remove oil and dirt. Align the piping materials P1 and P2.

C. Fusion Step As shown in FIG. 8, the switch for automatic fusion of the operation panel 8 is turned ON, and both the pipe members P1 and P2 are automatically fused. That is, when the automatic fusion switch is turned on, when the temperature of the heater plate 62 sent from the temperature sensor has risen to the set temperature, the thermal fusion device 6 moves on the rail 22 to the mounting position, The arm 63 rotates and the heater plate 6
2 faces between both piping materials P1 and P2. At this time, the locking claws 63a, 63a of the heating / melting device 6
1,71.

The movable clamp 4 is slid toward the fixed clamp 3 by the hydraulic cylinder 41 with the relief circuit 92 closed. That is, it slides at high pressure and high speed.

Next, operation when the permanent magnets S ₂₂ of heating position sensor S2 to slide together with the movable clamp 4 reaches up to the corresponding proximity switch S _21, the control unit 81 to the solenoid valve of the relief circuit 92 receives the signal Then, the relief circuit 92 is opened to reduce the hydraulic pressure applied to the hydraulic cylinder 41 until a predetermined pressing force p ₁ is reached, and the pressure is reduced to a low speed to hit the heater plate 62, and the timer is operated to release the piping materials P 1 and P 2. Heating time t according to type and diameter
_While maintaining this state by _one , the fusion surfaces of the pipe members P1 and P2 are melted under pressure.

After a predetermined pressure melting time has elapsed, the control means 8
1 the pressing force p ₂ of the hydraulic cylinder 41 is kept heated for a predetermined time t ₂ in the 0 pressure by switching the switching valve 91 to the neutral position. After a predetermined time t _2, together with the control means 81 switches the switching valve 91 to the reverse rotation position, the movable clamp to the hydraulic pressure exerted on the hydraulic cylinder 42 closes the relief circuit 92 actuates the solenoid valve of the relief circuit 92 to a high pressure 4 is retreated at high speed.

Next, slide with the movable clamp 4.
Permanent magnet S of the retracted end sensor S5 ₅₂The corresponding proximity switch
Switch S₅₁When the control unit 81 reaches the point
The switching valve 91 is switched to the neutral position and
The lamp 4 is stopped. When the movable clamp 4 stops,
The arm 63 rotates and the heater plate 62 is positioned above the support base 7.
It is lifted and removed, and the control means 81 is immediately turned off.
The switching valve 91 is switched to the normal rotation position, and the movable clamp 4 is
To the fixed clamp 3 side at high speed.

Thrust that slides with the movable clamp 4
Permanent magnet S of alignment position sensor S1 ₁₂The corresponding proximity switch
Luitsch S₁₁When the control unit 81 reaches the point
The solenoid valve of the relief circuit 92 is actuated in response to the
Opening the leaf circuit 92 and applying oil to the hydraulic cylinder 41
The pressure is the predetermined pressing force p_ThreeReduce the pressure until
The timer and activate the timer.
And the time t according to the type and diameter of the piping materials P1 and P2_ThreeIs
Crimping is performed while maintaining the injured state.

After a lapse of a predetermined time t ₃ , the control means 81 switches the switching valve 91 to the neutral position and sets the pressing force p ₄ of the hydraulic cylinder 41 to zero pressure, and the fusion portion is moved to the predetermined time t ₄
It is cooled and solidified to obtain a fused pipe material.

That is, according to the fusion machine 1, after the fusion surface is fused by the heater plate 62, the movable clamp 4 slides back and forth at a high speed to the butting preparation position. Does not solidify. In addition, when reaching the butting preparation position, the sliding speed of the movable clamp 4 is automatically reduced, and the fusion surfaces of the two pipe members P1 and P2 are accurately butted. Therefore, fusion can always be performed with a predetermined bonding strength.

The fusing machine according to the present invention is not limited to the above embodiment. For example, in the above embodiment,
Although the fusion machine includes the cutting device, the cutting device does not have to be provided.

Further, in the above embodiment, the heating and fusing apparatus automatically and continuously performs a series of steps of mounting the heater plate, melting the fusion surface, detaching the heater plate, and fusing. However, the attachment of the heater plate to the support member may be performed manually.

[0047]

The welding machine according to the present invention is constructed as described above, so that even in the case of butt welding, it is possible to always weld the pipe members accurately. That is, the quality stability of the product can be improved.

[Brief description of the drawings]

FIG. 1 is a plan view showing an embodiment of a fusing machine according to the present invention.

FIG. 2 is a front view of the welding machine of FIG.

FIG. 3 is an enlarged view of a cutting device portion of the welding machine of FIG. 1;

FIG. 4 is an enlarged view of a heating and melting device of the fusing machine of FIG. 1;

FIG. 5 is a hydraulic circuit diagram of the welding machine of FIG. 1;

FIG. 6 is a front view showing a movable clamp part of the welding machine of FIG. 1;

FIG. 7 is a side view showing a movable clamp portion of the welding machine of FIG. 1;

FIG. 8 is a flowchart of a fusing step of the fusing machine of FIG. 1;

[Explanation of symbols]

 P1, P2 Piping material 1 Fusing machine 2 Mount 3 Fixed clamp 4 Movable clamp 5 Cutting device 52 Cutter plate 6a Heating body 62 Heater plate (heating body main body) 63 Arm (support member mounting portion) 7 Support member 81 Control means S1 Butt Position sensor S2 Heating position sensor S3 Cutting feed end sensor S4 Cutting position sensor S5 Retreat end sensor

Claims (3)

[Claims] The present invention comprises two clamps for holding two pipe members to be welded such that their fusion surfaces face each other, and a heating element which is detachably provided at a heating and melting position between the clamps. , By the driving means, two clamps and a heating element,
After fusing the fused surface of the pipe material gripped by the clamp by sliding relatively against the heated surface of the heating body,
The two clamps are slid relatively to each other in the opposite direction to separate the heating element, and the pipe members gripped by both clamps are again slid relatively to each other so that the fusion surfaces in the molten state are joined to fuse the two pipe members. The thermoplastic resin pipe material fusing machine is provided with a control means of a driving means, and a butt position sensor for detecting that both pipe members relatively slide to a butt preparation position immediately before the butt position. When this sensor detects that both pipe members have slid to the abutting preparation position, the control means determines in advance the pressing force of the driving means on the heating body of the fusion surface by the type of both pipe materials,
A welding machine for thermoplastic resin piping, wherein the pressing force is automatically switched to a pressing force set for each caliber, and the sliding speed is reduced. 2. A heating position sensor for detecting that a fusion surface of a pipe member is close to a heating surface of a heating element, wherein the control means comprises:
The thermoplastic resin piping material fusing machine according to claim 1, wherein the pressing force of the driving means is automatically switched to the pressing force at the time of melting, which is set in advance for each type and diameter of both piping materials. 3. A pipe material which can be freely mounted between pipe members gripped by two clamps, slides relatively with both clamps, and a pipe end surface of the pipe material is pressed to cut or polish the pipe end surface to be fused. Cutting means or polishing means to expose the surface, comprising a cutting position sensor or polishing position sensor for detecting that the pipe end face of the pipe material is close to the cutting or polishing position, the control means, the type of both pipe material in advance, The welding machine for thermoplastic resin piping materials according to claim 1 or 2, wherein a pressing force to the cutting means or the polishing means set for each diameter is automatically switched.