JPH0476773B2 - - Google Patents

Abstract

PURPOSE:To increase the efficiency of fusion-bonding work and to manufacture in a mass production by holding the fusion-bonded ends of two tube members formed of molten synthetic resin oppositely by a pair of clamps, lock-securing the clamps, and then electrify a heater interposed between the members to melt and solidify the fusion-bonded ends. CONSTITUTION:Two tube members 4, 4 are formed of molten synthetic resin. Lock plates 11, 11 pivotally secured to the rods 8a, 8a of lower clamps 8, 8 for forming a stationary clamp 5 and a movably clamp 6 are connected to the rods 9a, 9a of upper clamps 9, 9, and lock-secured in a state that the ends of the members 4, 4 are held. Then, a heater 7 is rotated between the opposed members 4 and 4, energized to heat the ends of the members 4, 4, the melting of the ends is confirmed by the worker's visual observation, and the heater 7 is rotated to waiting position. Thereafter, the clamp 6 is fixed, left to stand to be cooled until the fusion-bonded part is solidified to complete the connection.

Description

[Detailed description of the invention] (a) Industrial application field The present invention is directed to a molten resin pipe used for connecting various pipe members made of molten synthetic resin, such as vinyl chloride pipes, polyethylene pipes, and fluorine-based pipes. This invention relates to a welding device for synthetic resin pipes.

(b) Conventional technology Conventionally, the device for connecting the above-mentioned pipe members includes:
As shown in Figure 4, two
There is a welding tool 36 (see Japanese Patent Laid-Open No. 61-20725) for welding the respective pipe members 4, 4 of the present invention.

This welding tool 36 connects the ends of the two pipe members 4, 4 made of molten synthetic resin to the cylindrical slider 3.
7 and the frame 3.
Each nut 4 is inserted into each of the threaded rods 39, 39 which are inserted into the tightening ring portions 38a formed in the respective tightening ring portions 37a, 38a.
0, 40 are screwed together, and the ends of each tube member 4, 4 are tightened and fixed by rotating each nut 40, 40.

Next, a heater 41 interposed between each tube member 4, 4
After melting the tube ends by applying electricity to each tube member 4,
4, pull out the heater 41 from the cylindrical slider 37.
By rotating the lever 42 that is pivotally supported on the
The connection is completed by moving the levers 42 in opposite directions, holding the lever 42 in a state in which the ends of the tube members 4, 4 are pressed together, and cooling the welded portion for a predetermined period of time until the welded portion is solidified.

(c) Problems to be solved by the invention However, when the above-mentioned welding tool 36 is used, 2
The lever 42 is placed in a state in which the tube members 4, 4 of the book are pressed together.
Since the pressure welding force is held by hand, the pressure welding force tends to vary depending on the degree of force applied by the worker, and there is an element of instability in that a constant pressure welding force cannot always be obtained. You cannot release your hands for about 15 to 45 seconds until the ends of the tube members 4, 4 solidify.
During this time, preparation of the pipe member 4 to be welded next and other work cannot be performed, resulting in a problem of poor work efficiency.

Furthermore, since each nut 40, 40 screwed onto each threaded rod 39, 39 is rotated to tighten and fix each pipe member 4, 4, it takes time and effort to attach and remove each pipe member 4, 4. Not only that, but each nut 40, 40 is heated to a high temperature by the residual heat of the heater 41 during heating, so the welded pipe members 4, 4 cannot be removed until the nuts 40, 40 cool down to a temperature that can be maintained. First, there is a problem in terms of mass production.

Furthermore, since each tube member 4, 4 is partially tightened by each tightening ring portion 37a, 38a, the tightening surface pressure on each tube member 4, 4 is weak, and the end portion of the tube member 4 is bent or distorted. Since this is not corrected, there is also the problem that the positioning of the tube members 4, 4 cannot be performed accurately and high accuracy cannot be obtained.

An object of the present invention is to provide a welding device for molten synthetic resin pipes that can accurately weld two pipe members using a constant pressure welding force at all times, thereby increasing the efficiency of welding work and mass production. It is in.

(d) Means for Solving the Problems The welding device for molten synthetic resin pipes of the present invention is a welding device for connecting two pipe members made of molten synthetic resin, and is a welding device for connecting two pipe members made of molten synthetic resin. A pair of clamps that are pivotally connected to each other so as to be openable and closable, the welded ends of each tube member being clamped and fixed by axially long clamping surfaces facing each other, and movable relative to each other in a direction to press the welded ends of each pipe member, and the above-mentioned pair of clamps. a locking means for clamping and fixing each pipe member at a position away from the outer surface of each clamp; a welding position between opposing pipe members fixed to the pair of clamps; a heating element rotatably supported in a standby position removed from the space; and pressure position fixing means for fixing and releasing the welded ends of each pipe member fixed to the pair of clamps in a press-contact state; The structure includes pressure contact interval setting means for stopping the moving position of the pair of clamps at a position where the welded ends of the respective pipe members fixed to the respective clamps come into contact.

(E) Effect According to this invention, two
A state in which the welded ends of each tube member of the book face each other, the welded end of each tube member is clamped by a pair of clamps with long clamping surfaces in the axial direction, and each tube member is clamped by operating the locking means. After each clamp is locked and fixed, the heating element interposed between the opposing pipe members is energized to melt each welded end, and when the melting of each welded end is confirmed by visual inspection by the operator, , the heating body is rotated to a standby position where it is removed from the space between the opposing pipe members, and then the pair of clamps are relatively moved in the direction of pressing each pipe member, and the pressure contact interval adjusting means is used to adjust the distance between each of the pipe members. Stop the pair of clamps at the position where the welded ends abut, press each welded end of each pipe member fixed to each clamp, and position each clamp in a state where each pipe member is pressed by the pressure welding position fixing means. The connection is completed by fixing the parts and leaving them for a predetermined period of time to cool until the welded parts solidify.

Next, the locking means is operated to release the locking means to release the fixation of each clamp, and after removing one pipe member that has been welded, the fixation by the pressure welding position fixing means is released, and the pair of clamps are moved in the direction of separation. Move relatively and wait at the initial position.

(F) Effects of the Invention In this invention, each pipe member is clamped and fixed by a pair of clamps with long clamping surfaces in the axial direction, so that bends and distortions in the welded ends of each pipe member are straightened, and each pipe member is straightened. In addition to easily and accurately aligning the parts, each clamp is stopped at the position where each welding end of each pipe member comes into contact, so there is little error during pressure welding, and welding is always performed accurately with a constant pressure welding force. This increases the accuracy during welding and improves quality.

Moreover, since the pair of clamps are fixed in position while the welded ends of each pipe member are pressed together, there is no need to hold the welded state by hand unlike the conventional welding tool 36, and the work can be continued until the welded parts are solidified. Since the operator's hands are free, the solidification time can be used to prepare the pipe member to be welded next and perform other tasks, improving work efficiency during welding.

Furthermore, since the pair of clamps are pivotally connected so that they can be opened and closed, each pipe member can be installed and removed easily and quickly, and the locking means can be locked and unlocked at a position away from the outer surface of each clamp. There is no fear that the locking means will be heated by the residual heat of the heating element, and there is no risk of burns to the operator due to the heat of the heating element, making it safe, and increasing the efficiency of welding work and mass production.

(g) Embodiment of the invention An embodiment of the invention will be described in detail below based on the drawings.

The drawings show a stationary type welding device for welding two pipe members made of molten synthetic resin, and in FIGS. A plurality of support legs 3 are provided vertically at the four corners of the lower surface of the base 2, and a fixed clamp 5 and a movable clamp 6 for clamping the pipe member 4 are arranged facing each other on the upper surface of the base 2. A pipe member 4 is placed between the fixed clamp 5 and the movable clamp 6, which are opposed to each other.
A heater 7 is provided to melt the welded end of the weld.

The above-mentioned fixed clamp 5 and movable clamp 6 have the same structure, and to explain one structure, it has a shape corresponding to the outer peripheral surface of the pipe member 4,
The base ends of a lower clamp 8, which has a long clamping surface in the axial direction, and an upper clamp 9 are connected by a hinge 10 so as to be openable and closable.
The rods 8a and 9a are respectively protruding from the open end of the lower clamp 8, and are located at a position away from the outer surfaces of the fixed clamp 5 and the movable clamp 6, which are not affected by the heating of the heater 7 mentioned above. A lock plate 11 pivotally attached to the end of the rod 8a is locked to the end of the rod 9a of the upper clamp 9, and the pipe members 4 are locked together in a state where they are clamped.

The above-mentioned fixed clamp 5 is constructed by fitting the lower surface of the lower clamp 8 constituting the fixed clamp 5 onto the upper surface of the clamp stand 12 fixed to the left upper surface of the base 2 shown in FIG. The lower clamp 8 is fixed with respective bolts 13.

A long pressure contact interval adjustment bolt 14 is screwed into the lower part of the above-mentioned clamp base 12 in a direction facing the movable clamp 6.
Nut 15 screwed at the screwing position of No. 4 to the circumferential surface of the proximal end.
The pipe member 4 is tightened and fixed by adjusting the protruding dimension of the tip in the direction facing the movable clamp 6, and the pressure contact interval between the end of the pipe member 4 fixed to the fixed clamp 5 and the end of the pipe member 4 fixed to the movable clamp 6 is determined. is set by the contact between the front end of the movable clamp 6 and the tip of the pressure contact interval adjustment bolt 14.

In addition, a buffer ring 16 is slidably inserted into the tip of the above-mentioned pressure contact interval adjustment bolt 14.
This buffer ring 16 is constantly biased in the direction facing the movable clamp 6 by a spring 17 interposed between the clamp base 12 and the buffer ring 16, and absorbs the impact when the movable clamp 6 collides with the pressure contact interval adjustment bolt 14. ease.

In the movable clamp 6 described above, a slider 19 is slidably engaged with a guide rail 18 laid on the upper right side of the base 2, and the movable clamp 6 is configured on the upper surface of the clamp base 12 fixed to the slider 19. Fit the lower surface of the lower clamp 8, and connect the clamp base 12 and the lower clamp 8 to each bolt 13...
The clamps 5 are fixed to each other and are slidably provided in a direction facing the above-mentioned fixing clamp 5.

A press position fixing lever 20 is rotatably supported on the side surface of the clamp table 12, and the press position fixing lever 20 is tilted in a direction such that its free end is always in contact with the upper surface of the base 2. Then, for example,
A non-slip rubber plate 21 is attached to the free end of the pressure position fixing lever 20 and is grounded so that the ground contact angle between the top surface of the base 2 and the pressure position fixing lever 20 is 60 degrees.
The surface resistance between the base 2 and the upper surface of the base 2 locks and fixes the sliding movement in the separating direction.

In addition, on both side surfaces of the above-mentioned clamp stand 12,
A sliding operation lever 22 for slidingly operating the movable clamp 6 in a direction facing the fixed clamp 5 is provided protrudingly adjacent to the pressing position fixing lever 20.

On the other hand, on the rear side of the movable clamp 6, the first
Each pulley 25, 26 is pivotally supported on each support member 23, 24 fixed to the upper and lower right side of the base 2 shown in the figure, and the wire 2 that goes around each pulley 25, 26
One end of the coil spring 28 is fixed to the rear surface of the slider 19 via a pin 29, and the other end of the coil spring 28 is engaged with a pin 29 which is located on the rear side of the fixed clamp 5 and is vertically provided on the lower left surface of the base 2. The direction is to stop and separate from the fixed clamp 5,
In addition, the movable clamp 6 is constantly pulled and biased in the direction opposite to the return position adjustment bolt 30 screwed into the support member 23 on the upper surface of the base 2.

The return position adjustment bolt 30 described above is screwed into the supporting member 23 fixed to the upper surface of the base 2 in a direction in which it comes into contact with the rear surface of the slider 19 to which the movable clamp 6 is fixed. The screwing position is tightened and fixed with a nut 31 screwed onto the circumferential surface of the base end, and the protruding dimension of the tip in the direction facing the slider 19 is adjusted, and the rear end of the slider 19 and the tip of the return position adjustment bolt 30 are adjusted. The return position of the movable clamp 6 is set by contact with the movable clamp 6.

As shown in FIG. 2, the heater 7 described above has a rotating arm 33 pivotably attached to the upper end of a column 32 erected on the upper surface of the base 2.
A heater 7 is installed vertically at the rotating end of the pipe member 3, and a welding position is set between the opposing end of the pipe member 4 fixed to the fixed clamp 5 and the pipe member 4 end fixed to the movable clamp 6. , a rotary arm 33 is located at a standby position on the side of the welding position that has been removed from between the opposing pipe members 4, 4.
90 by grasping the handle part 34 installed upright on the rotating side end of the
Operate the rotation.

The above-mentioned heater 7 is connected to a power supply section (not shown) via a power cord 35 inserted into the handle section 34, and generates heat to a temperature that melts the end of the tube member 4 made of molten synthetic resin.

The operation of the illustrated embodiment will be described below assuming that it is constructed as described above.

First, as shown in FIG. 1, the return position adjustment bolt 30 is rotated to set the distance between the fixed clamp 5 and the movable clamp 6, and then the fixed clamp 5 and the movable clamp 6 are opened to remove each pipe member. The ends of the tube members 4, 4 are clamped and fixed at positions spaced apart from each other at a predetermined equal interval with respect to both flat surfaces of the heater 7, which is rotated between the opposed tube members 4, 4.

That is, each rod 8a of each lower clamp 8, 8 constituting the fixed clamp 5 and the movable clamp 6,
The respective lock plates 11, 11 pivotally connected to the upper clamps 8a are engaged with the respective rods 9a, 9a of the respective upper clamps 9, 9, and the ends of the respective pipe members 4, 4 are locked and fixed in a state where they are clamped.

Next, after holding the grip portion 34 of the rotating arm 33 and rotating the heater 7 to the standby position, the movable clamp 6 is slid in a direction facing the fixed clamp 5.
At the position where the ends of the pipe members 4, 4 fixed to the fixed clamp 5 and the movable clamp 6 come into contact, rotate the press spacing adjustment bolt 14 to abut the front end of the movable clamp 6, and adjust the mutual press spacing. After setting, lift the pressure contact position fixing lever 20 tilted on the top surface of the base 2 to release the position fixation, and then the coil spring 2
8 returns the movable clamp 6 to its initial position.

Next, after rotating the heater 7 between the opposing tube members 4, 4, the heater 7 is energized so that each tube member 4,
The end of tube 4 is heated, and when melting of the tube end is visually confirmed by the operator, the heater 7 is rotated to the standby position again.

After this, as shown in FIG.
When the movable clamp 6 is slid in the direction opposite to the fixed clamp 5 and the ends of the pipe members 4 fixed to the movable clamp 6 are pressed together, the pressure position fixing lever 20 comes into surface contact with the upper surface of the base 2. Fix the movable clamp 6 in position and wait approximately 5 to 30 minutes until the welded part solidifies.
The connection is completed by leaving it for 10 seconds to cool down.

Next, the lock plates 11 and 11 that clamp the fixed clamp 5 and the movable clamp 6 are unlocked, the fixed clamp 5 and the movable clamp 6 are released, and the single pipe member 4 that has been welded is removed. Remove.

After that, when the press position fixing lever 20 is lifted to release the fixed position of the movable clamp 6, the movable clamp 6 returns to the initial position due to the traction force of the coil spring 28, and the welding work of the two pipe members 4, 4 is completed. Complete.

In this way, each pipe member 4, 4 is clamped and fixed by the fixed clamp 5, which has a long clamping surface in the axial direction, and the movable clamp 6, so that the bends and straightness of each pipe member 4, 4 are corrected, and each pipe member 4, 4 is straightened. Positioning can be done easily and accurately.

During welding, the pressure welding interval adjustment bolt 14 is brought into contact with the front end of the movable clamp 6, and the fixed clamp 5 and the movable clamp 6 are stopped at an interval where the ends of the pipe members 4, 4 are in contact with each other, so errors during welding are avoided. There are few
Each pipe member 4, 4 can be accurately welded with constant pressure welding force at all times, and the accuracy during welding is increased and quality is improved.

Moreover, since the pressure welding position fixing lever 20 is pressed against the upper surface of the base 2 and the fixed clamp 5 and the movable clamp 6 are fixed in position with the respective pipe members 4, 4 in pressure contact, it is not necessary to manually weld the welding tool 36 like the conventional welding tool 36. There is no need to maintain the pressure-welded state with the pipe members 4, 4, and the operator's hands are free until the welded parts of each pipe member 4 are solidified, allowing him to prepare the pipe member 4 to be welded next and perform other tasks. Improves work efficiency.

Furthermore, after rotating the heater 7 to the standby position where it is removed from the opposing space between the respective pipe members 4, 4, and releasing the locks of the respective lock plates 11, 11 that secure the stationary clamp 5 and the movable clamp 6 in a sandwiched state, Since the ends of the rods 8a and 9a protruding apart from the heater 7 are held and opened and closed, they are not affected by the residual heat of the heater 7, and there is no risk of burns to the worker due to the heat of the heater 7, making it safe. , each tube member 4, 4 can be easily attached and detached, and the efficiency of welding work and mass production can be increased.

The heating body constituting this invention corresponds to the heater 7 of the above-mentioned embodiment, and hereinafter, the locking means corresponds to the rods 8a and 9a protruding from each clamp 8 and 9 and the lock plate 11. The pressure welding interval setting means is a pressure welding interval adjustment bolt 14.
Corresponding to this, the pressure welding position fixing means is the pressure welding position fixing lever 20.
However, the present invention is not limited to the configuration of the above-described embodiment.

For example, by replacing the fixed clamp 5 and movable clamp 6 with a fixed clamp 5 and a movable clamp 6 that correspond to the external shape of the pipe member 4 to be welded, a single welding device 1 can be used to weld many types of pipe members 4.
Welding work can be performed.

[Brief explanation of drawings]

The drawings show an embodiment of the present invention; FIG. 1 is a front view of the welding device, FIG. 2 is a side view of the welding device shown in FIG. 1, and FIG. 3 is an explanatory diagram of the welding operation of the welding device;
FIG. 4 is a front view of a conventional welding device. 1... Welding device, 4... Pipe member, 5... Fixed clamp, 6... Movable clamp, 7... Heater, 8... Lower clamp, 9... Upper clamp, 8a, 9a... Rod, 11... Lock plate, 14... Pressure welding interval adjustment Bolt, 20... Pressure position fixing lever.

Claims (1)

[Scope of Claims] 1. A welding device for connecting two pipe members made of molten synthetic resin, wherein the welded ends of each pipe member are held by holding surfaces that face each other and are long in the axial direction. a pair of clamps that are fixed and pivotally connected to each other so as to be openable and closable and move relative to each other in a direction to press the welded ends of the respective pipe members; a locking means for fixing in a clamped state; a heating element rotatably supported at a welding position between the opposed pipe members fixed to the pair of clamps and a standby position removed from between the opposed pipe members; a pressure welding position fixing means for fixing and releasing the welded ends of each pipe member fixed to the pair of clamps in a pressed state; A welding device for molten synthetic resin pipes, comprising: pressure welding interval setting means that stops at a position where the welded ends of pipe members abut.