JPS6028579Y2 - fusion machine - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a fusion splicer for melting and butt welding the ends of thermoplastic resin tubes.

In conventional fusion splicers, the ends of a pair of thermoplastic synthetic resin tubes to be butt welded are supported on the same axis,
Operate the operating handle to press both tube ends against the heater.
After heating and melting for a certain period of time, the ends of both tubes are pressed together and fused together.

In this butt welding work, the operation of pressing the end faces of both pipes against the heater is to shorten the part at a certain depth from the end faces of both pipes to be heat-sealed, that is, the part where the ends of the pipes are melted and integrated during pressure welding. This is an operation for heating and melting the material to a predetermined temperature within a certain period of time.

In order to perform this pressing operation more effectively, it is required that both tube end surfaces are brought into close contact with the heater uniformly without any gaps and with as little surface pressure as possible (for example, about 0 to 0.3 kg/cfL). be done.

If this surface pressure is too large, the molten part at the end of the tube will flow out to the side, and if the end surface of the tube is partially or completely separated from the heater due to operator carelessness, the heater The amount of heat supplied to the end of the tube is insufficient, making it impossible to ensure an appropriate amount of melting at the end of the tube.

Therefore, the end faces of both tubes are not completely melted and integrated, and the strength of the fused portion, particularly long-term strength such as creep properties, is poor.

Conventionally, since the pressure of both tube end faces against the heater is held by hand via the operating handle, there are variations in the adjustment of the minute surface pressure, and the surface pressure may be too large or too small, making it difficult to adjust properly. For example, 0 to 0.3ko/
It was difficult to keep it in cJ.

Therefore, the present invention solves the above-mentioned technical problem and can stably press the end faces of a pair of thermoplastic resin tubes to be butt welded against the heater with a very small surface pressure close to O. An object of the present invention is to provide a fusion splicer that does the following.

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

FIG. 1 is a front view of an embodiment of the present invention, and FIG. 2 is a plan view thereof.

The ends of a pair of thermoplastic synthetic resin (for example, polyethylene) tubes 1 and 2 to be butt welded are connected to a clamp member 4 fixed to one end of a base 3, and are connected to a clamp member 4 on the base 3 toward the clamp member 4. and a clamp member 5 supported so as to be movable toward and away from each other, with their axes aligned with each other.

When butt welding both tubes 1 and 2, after grinding the end surfaces of both tubes 1 and 2, weld the tubes 1 and 2 between the ramp members 4 and 5.
A heater 6 having heating surfaces 6a, 6b perpendicular to the axis is interposed.

Then, the clamp member 5 and the tube 2 are displaced toward the clamp member 4 and the tube 1 by the moving means 7, and after the end surfaces of both the tubes 1 and 2 are pressed against the heating surfaces 6a and 6b of the heater 6 for a certain period of time, the spring 8 The pressure on the end faces of both tubes 1.2 and the heating surfaces 6a, 6b of the heater 6 is maintained at a very small pressure close to zero, for example, 0 to 0.3 kg/cfl, for a certain period of time.

Thereafter, the heater 6 is removed, and the abutting end surfaces of the tubes 1 and 2 are again pressed together and fused together by the moving means 7.

Projection allowance 11 from the clamp members 4 and 5 at the ends of both pipes 1 and 2
, 12 are determined in accordance with stoppers 38 and 39 provided on both clamp members 4 and 5, respectively.

Therefore, the distance that the tube 2 moves by operating the operating rod 33 is always constant.

FIG. 3 is a cross-sectional view taken along the section line ``---'' in FIG.

The clamp member 4 is pivotally supported by a hinge pin 9 parallel to the axis of the tube 1 and can be opened and closed upward.

On the opposite side from the hinge pin 9 with respect to the axis of the tube 1, an end of the lock piece 11 is pivotally supported by a pin 10 parallel to the hinge pin 9.

By threading a bolt 12 threaded onto the end of the lock piece 11 opposite to the pin 10 toward the locking protrusion 13, the tube 1 is integrally gripped by the clamp member 4.

Half members 14a and 14b having inner circumferences that match the outer circumference of the tube to be gripped are detachably attached to the inner periphery of the clamp member 4, and these half members 14a and 14b are attached to the tube to be gripped. By changing the grip, it is possible to grip tubes with different diameters.

The leg 15 fixed to the lower part of the clamp member 4 has a bolt 16
It is integrally fixed to one end of the base 3 by.

Between the other end of the base 3 and the leg 15 of the clamp member 4,
A pair of guide rods 17 are provided parallel to the axial extension of the tube 1.

FIG. 4 is a sectional view taken along section line IV-IV in FIG. 2.

The clamp member 5 is pivoted by a hinge pin 19 parallel to the axis of the tube 2 and can be opened and closed upward.

A bolt 23 is screwed into the end of the locking piece 21 opposite to the pin 20 by a pin 20 parallel to the hinge pin 19 on the opposite side of the hinge pin 19 with respect to the axis of the tube 2, and this bolt 23 is locked. By screwing the tube 2 toward the protrusion 22, the tube 2 is integrally attached to the clamp member 5.

Half members 24a and 24b having an inner circumference matching the outer circumference of the tube to be gripped are removably attached to the inner circumference of the clamp member 5.

A pair of guide holes 18 are formed in the lower part of the clamp member 5, and the guide rod 1 is inserted into the guide holes 18 through a bushing 25.
7 is inserted.

Therefore, the clamp member 5 is freely displaceable along the guide rod 17.

FIG. 5 is a cross-sectional view taken along the section line ■--■ in FIG.

The lower part of the clamp member 4 fixed to the base 3 and the guide rod 1
A spring 8 is disposed between the lower part of the lamp member 5 and the lower part of the lamp member 5 .

This spring 8 urges the clamp member 5 toward the clamp member 4 side.

The spring force is applied to the heater 6 between the tubes 1 and 2, and the abutting end surfaces of the tubes 1 and 2 are the heating surfaces 6a of the heater 6,
When the driving means 7 is opened while in contact with the tube 6b, the abutting end surfaces of the tubes 1 and 2 and the heating surfaces 6a and 6b of the heater 6
The contact force is selected to be about 0 to 0.3 ko/clt.

The moving means 7 includes a support shaft 2 that rotatably penetrates the clamp member 5 in a direction perpendicular to the pipe 2 and projects outwardly from both sides of the clamp member 5.
6, a drive rod 27 whose lower end is fixed at a right angle to one end of the support shaft 26 and extends upward, and a pair of links 28 and 29 whose one ends are pivoted to both protruding ends of the support shaft 26 and extend downward. , one end is pin-coupled to one end of the base 3, and the other end is connected to the link 2.
8, 29, and a link 30, 31 pin-coupled to the lower end of the link 8, 29.

A scale plate 32 is fixed to the free end of the drive rod 27.

An operating rod 33 made of a plastic material is fixed to the middle of the drive rod 27.

The operating rod 33 extends upward through the back side of the scale plate 32.

A grip portion 34 is provided at the upper end of the operating rod 33 .

Point the grip part 34 of the operating rod 33 to the left in FIG.
When pressed as shown in 5, the operating rod 33 bends like a virtual green stone.

The drive rod 27 is then pushed in the direction of the arrow 36, and the support shaft 2
The links 28, 29 connected to the drive rod 27 via 6 are rotated as shown by the arrow 37.

Therefore, the tube 2 held by the clamp member 5 is displaced in a direction closer to the tube 1.

The angle α between the operating rod 33 and the drive rod 27 is
Determined by the force of pressing.

Therefore, by pressing the operating rod 33 to position it at a predetermined scale position on the scale plate 32, the tube 1
．． 2 at an appropriate pressure (for example, 1 to 1.5 kg/cJ
) can be pressed together.

The surface pressure p applied to the end faces of both the tubes 1 and 2 when butt-welding the tubes 1 and 2 will be explained with reference to FIG. 6.

First, when the end surfaces of the tubes 1 and 2 are brought into pressure contact with the heating surfaces 6a and 6b of the heater 6, the surface pressure p is set to 1 by the moving means 7.
~ 1.5 to 9/CFll, and
The moving means 7 is released as soon as a melted part (a so-called bead) of the tube end is formed around the entire circumference of the tube end.

At this time, the clamp member 5 and the pipe 2 are urged toward the clamp member 4 by the action of the spring 8, and the surface pressure acting on the end faces of both the pipes 1 and 2 at this time is about 0 to 0.3
It is ko/a#.

This state is maintained until time TI has elapsed.

After time T1 has elapsed, the moving means 7 is operated to displace the clamp member 5 and the tube 2 in a direction away from the clamp member 4, and then the heater 6 is removed.

Then, the moving means 7 is operated again to displace the clamp member 5 and the tube 2 toward the clamp member 4 side, and the end surfaces of both tubes 1 and 2 are pressed against each other.

The surface pressure at this time is 1-t, 5kp/Cft.

This state is maintained for a certain period of time T2, after which the moving means 7 is released.

Thereafter, the butt welding work is completed by leaving it for a certain period of time T3 to cool and solidify.

The aforementioned times TI, T2. T3 varies depending on the material of the pipe to be welded, the pipe diameter, the wall thickness of the pipe, etc., but in the case of polyethylene pipes, when the heating temperature of the heater 6 is 210°C, the time T1 is 2 inches in diameter. For 3-inch polyethylene pipe, approximately 608 seconds is appropriate.

Further, the time T2 may be approximately 4 seconds or more in the case of a 2-inch polyethylene pipe, and approximately 0 seconds or more in the case of a 3-inch polyethylene pipe.

Furthermore, the time T3 for cooling and solidifying both tubes 1 and 2 after the welding operation is completed is preferably about 18 or more.

In another embodiment of the present invention, the operating rod 33 is used instead of the spring 8.
A weight is provided on the gripping portion 34 of the heater 6, and when the moving means 7 is opened, the weight of the weight causes the end surfaces of both tubes 1 and 2 to be heated against both heating surfaces 6a of the heater 6.

6b with a surface pressure of about 0 to 0.3 kg/ak.

FIG. 7 is a partially cutaway front view of another embodiment of the present invention, and parts corresponding to the embodiment of FIGS. 1 to 6 are given the same reference numerals.

In this embodiment, a pressure contact means 40 is provided in place of the spring 8 in the embodiments of FIGS. 1 to 6.

The pressure contact means 40 includes a guide member 42 whose one end is pivotally supported on the base 3 via a pin 46 and has a linear guide hole 41 open at the other end, and whose one end is loosely inserted into the guide hole 41. A press rod 43 whose other end is pivotally supported by the operating rod 33 via a pin 47, a spring 44 inserted into the guide hole 41 and urging the press rod 43 outward in the axial direction, and a spring force adjustment member 45 that is movable and for adjusting the spring force.

The pins 46, 47 are parallel to the support shaft 26.

Both ends of the spring 44 are connected to the other end of the pressing rod 43 and a spring force adjusting member 45, respectively.

An opening 48 communicating with the guide hole 41 is formed in the guide member 42 along the axis.

A threaded rod 49 that passes through the opening 48 and projects outward is fixed to the spring force adjustment member 45.
A nut 50 is screwed onto the free end.

The spring force adjusting member 45 can be fixed by grasping the nut 50, moving the spring force adjusting member 45 along the guide hole 41, and tightening the nut 50 at an appropriate position.

Therefore, the distance between the pressing rod 43 and the screw force adjustment member 45 can be adjusted, and the spring force of the spring 44 can be adjusted accordingly.

When the operating rod 33 is operated to press both ends of the tubes 1 and 2 against the heater 6 to open the moving means 7, the spring force of the spring 44 pushes the end surfaces of the tubes 1 and 2 onto the heating surfaces 6a of the heater 6. , about 0-0.3ko/CFI on 6b! The position of the spring force adjusting member 45 is adjusted so that it is pressed with a surface pressure of .

By doing so, the force with which the end surfaces of both tubes 1 and 2 are pressed against the heater 6 is stabilized.

As described above, according to the present invention, the clamp members that respectively grip the ends of a pair of thermoplastic synthetic resin tubes to be butt welded are placed close to each other in a straight line on a base with their axes aligned. The clamp members are supported so that they can be displaced apart, and are provided with pressure contact means that urges both clamp members toward each other so that the surface pressure on the tube end surfaces becomes a very small pressure close to 0, so that both tube end surfaces are heated. When pressing, the surface pressure can be set to, for example, o-0.3 kp/al, and since the pressing force is stable, the quality of the fused portion between the two pipes is improved.

[Brief explanation of the drawing]

Fig. 1 is a front view of one embodiment of the present invention, Fig. 2 is a plan view of Fig. 1, Fig. 3 is a cross-sectional view taken from section line m-■ in Fig. Figure 5 is a cross-sectional view taken from the cutting plane line ■-IV in Figure 2, Figure 6 is a cross-sectional view taken from the cutting plane line ■-IV in Figure 2, and Figure 6 is a cross-sectional view taken from the cutting plane line ■-IV in Figure 2. A diagram showing the applied surface pressure p over time, and FIG. 7 is a front view of another embodiment of the present invention. 1.2...Pipe, 3...Base, 4,5...
... Clamp member, 8 ... Spring, 40.
... Pressure welding means.

Claims (1)

[Scope of utility model registration request] Clamp members each gripping the ends of a pair of thermoplastic synthetic resin tubes to be butt welded are supported on a base so that they can be moved toward and away from each other while keeping their axes aligned in a straight line; When the end of a tube made of thermoplastic resin is brought into contact with a heater and melted, both clamp members are urged toward each other so that the surface pressure on the end surface of the tube becomes a very small pressure close to 0. A fusion splicer characterized by being equipped with pressure welding means.