DE10307223A1 - Holding jig for welding plastic pipes, e.g. in building installations, comprises movable clamps to bring the pipe ends together - Google Patents

Abstract

The ends of the pipes and the sleeve to be welded are held in clamps (2, 4). The movable clamp (4) is brought towards the fixed clamp (2) by turning the screwed spindle (5), which engages a lug on the movable clamp that projects through a slot (13), till the component ends are inside the heater (6). When they have reached the required temperature, the clamps are moved apart to swing the heater (6) of the way and then brought together to make the weld. An independent claim is also included for a welding jig with clamp jaws (2', 4') that can be brought together by turning spindles (7), which have opposed threads. The clamps (2, 4), one of which (4) is spring loaded, can be moved longitudinally by means of a screwed spindle (5).

Description

The invention initially relates to a Welding process of plastic pipes, the plastic pipes for example by hanging are pre-installed on a ceiling, with one for merging the Sufficient freedom of movement.

It is known to connect plastic pipes with one another by butt welding or socket welding, for which purpose clamping devices with clamping jaws are used. So is from the EP 0 793 572 B1 a device for butt welding pipes made of thermoplastic material is known, which device has two pipe clamping units aligned relative to one another. This device is used to connect underbody pipes, which are arranged lying in an exposed trench. To bring the pipe ends together, the pipe clamping units are moved towards one another via two electromotively driven spindles.

In view of the state described above technology becomes a technical problem of the invention therein seen, a simplified handling method for welding Specify plastic pipes.

This problem is first and essentially solved by the subject matter of claim 1, with the focus being that a clamping device, which has two clamping jaws, is connected to a clamping jaw at one of the pipe ends and that the clamping jaws are then free while the clamping device is free is held on the pipe ends, are brought together to weld the pipe ends. As a result of this novel method, handling is simplified so that it can be used for welding pre-installed plastic pipes to suit the construction site. Connections even of large nominal widths can only be carried out by one person, even in a working position in which the operator works overhead, for example on a ladder. The tensioning device is initially held freely on the pipe ends to be welded, for example in the case of plastic pipes preinstalled on a ceiling, by means of the clamping jaws which also guide the plastic pipes. The tensioning device is designed as a hand-held device, has a low weight and is overall handy and can also be operated by only one person. The method according to the invention can of course not only be used for pre-installed plastic pipes suspended from a ceiling, but also for plastic pipes which are pre-installed on walls or floors, for example. In a further development of the method, it has proven particularly advantageous in terms of handling technology that the clamping jaws are adjusted relative to one another by only one adjusting spindle. For this purpose, the adjusting spindle can be provided with a tool holder and, alternatively, can also have a hand crank or the like. One is also conceivable, as mentioned in the introduction EP 0 793 572 B1 known electromotive loading of the adjusting spindle. A further development of the method has proven to be particularly advantageous, in which a welding device held on the tensioning device is pivoted in alignment between the pipe ends in preparation for the connection of the pipe ends. Thus, the method according to the invention not only makes it easier to tension the plastic tube ends that are spaced apart from one another, but also enables the plastic tube ends to be prepared for welding in a manner that is simple to handle. Thus, even in difficult construction site situations, for example standing on a ladder and working overhead, an operator can first attach the clamping device to the plastic pipes pre-installed on a ceiling using the clamping jaws, then position the clamping jaws in the areas of the plastic pipe ends and fix them there. The welding device is then pivoted in alignment between the ends and activated, so that the pipe ends are brought to their welding temperature in preparation for welding. After the welding device has been swung back, the pipe ends are moved towards one another by welding the pipe ends by welding.

The invention further relates to a bracing device for welding plastic pipes with two jaws, one of which is movable and one the adjusting jaws driving the jaws. To a tensioning device It is proposed to improve the type in question in terms of handling technology, that the clamping jaws are transverse to the axis of the pipe ends to be welded has adjustable clamping elements. As a result of this configuration are the jaws in the simplest way on the pipe ends to be welded fixable. It is not a cumbersome flip over jaw half around the pipe end necessary which in particular with pre-installed plastic pipes, which is low are spaced from the supporting wall or ceiling, causes problems, partly also not possible is. About that is also through the transverse to the axis of the pipe ends to be welded adjustably arranged clamping elements the accessibility of the relocating the clamping elements Elements improved.

The invention also relates to a bracing device according to the features of the preamble of claim 4, it being proposed here in order to achieve improved manageability that a pivotable welding device is arranged between the clamping jaws, which is to be brought into alignment with the pipe ends to be welded is also held on the clamping device. As a result of this configuration, the preparation for welding the pipe ends is advantageously simplified. The welding device is part of the clamping device and is therefore always present. The correct alignment of the welding device is also advantageously simplified, which also ensures the correct heating of the pipe ends to the required welding temperature. After the heating process, the welding device is swiveled out of the area of the pipe ends in the simplest way. Thus, in particular when handling the tensioning device according to the invention in the overhead area, no cumbersome removal and removal of the welding device is necessary. The operator can concentrate entirely on the quick bracing of the heated pipe ends.

The object of the invention is further a tensioning device according to the features of the preamble of Claim 4. To a tensioning device of the type in question To improve handling, it is proposed that the tensioning device in the area of the adjusting spindle for hand gripping. This is the tensioning device according to the invention trained in such a way that they can be easily moved by hand to the Plastic pipes to be connected can be introduced and after definition the same can be held on the plastic pipes, for example, with one hand can with simultaneous actuation the adjusting spindle with the other hand. As a result of this configuration the tensioning device is the simplest even in hard-to-reach places Manageable, for example to connect to one Suspended ceiling, pre-installed plastic pipes, the operator on a If necessary, ladder over Head works.

The inventions of independent claims 4 to 6 are for both essential to the invention as well as in combination.

The training courses listed below are both for themselves as well as in combination with one or more of the independent claims 4 to 6 essential to the invention. So it is further suggested that the movable Clamping jaw due to a pre-tensioning spring even without further spindle adjustment is movable in the clamping direction. This is especially true during the heating process advantageous. So are used to heat the pipe ends to the welding temperature Heizaufsätze the welding device pushed into or on the pipe ends. Since these heating attachments compared to the Have oversized pipe ends or the molded part to be connected to a pipe end, can these are only pushed onto or into them as they are pushed through the Heizaufsätze heated and the oversize material smelted. To the heating attachments up to the respective welding depth to bring on or in the pipe end or fitting is a continuous Pressure is required, which is provided by the biasing spring mentioned. The adjusting spindle is encased by a tube, which at the same time as Torque support for the movable jaw or the welding device is used. according to This configuration is the clamping device in the area of the adjusting spindle designed for hand gripping. In addition, according to that the adjusting spindle is arranged in a hidden position, so that this and the area of the movable jaw that interacts with it protected from contamination are. The tube has a reach-through slot opening, which in any case extends over the adjustment length of the movable jaw, preferably extended over the adjustment length, for rotation support the welding device. In the reach-through slot opening engages a portion of the movable jaw to support the rotation thereof. In this regard, it is further proposed that the slot opening on the top, the clamping elements facing, is trained. Particularly advantageous in terms of handling A further development of the invention has been found, in which the clamping elements have a opposing Spindle with thread formations can be moved for clamping or releasing are. You can do this the clamping elements can be moved in dovetail-shaped guides of the clamping jaw his. By actuation Only one spindle, the clamping elements at the same time and evenly in the direction moved to the central axis of the plastic pipe to be clamped. It is also proposed that the welding device be in the direction of the adjusting spindle is adjustable. So is the welding device in the axial direction the adjusting spindle and in the opening direction the movable jaw can be moved with limited stops, whereby further it is proposed that the welding device at least over a partial area their travel distance in the opening travel direction the movable jaw is dragged along by the movable jaw becomes. As a result of this configuration, the welding device is after The heating process is carried out using the adjustable spindle via the movable clamping jaw first from the pipe end held by the fixed jaw up to a stop-limited position in which the movable jaw continue in the opening direction is moved, which is entrained by the movable jaw held pipe end caused by the welding device. The latter is afterwards exposed and can be swung down. The bracing device according to the invention can have a movable jaw and a fixed jaw which the latter rotates the adjusting spindle without thread engagement is supported. However, an embodiment is also conceivable with a opposing Adjustment spindle having thread formations, by means of which two movable jaws simultaneously and evenly on each other can be moved.

The invention is based on the attached drawings, which only represent an embodiment, explained in more detail. It shows:

1 a longitudinal section through an inventive bracing device attached to pre-installed plastic pipes with the welding device pivoted into alignment with the pipe ends to be welded;

2 the section along the line II-II in 1 , at opposite 1 enlarged view;

3 a perspective view of the bracing device according to the invention.

Is shown and described initially with reference to the representation in 1 a bracing device 1 for welding plastic pipes, in the illustrations a bracing device 1 for a method of heating element socket welding connection is shown. However, the bracing device according to the invention can also be used for a heating element butt weld connection, possibly with minor changes.

The tensioning device 1 is designed as a hand-held device and essentially consists of a fixed jaw 2 , one with the fixed jaw 2 connected guide tube designed for hand gripping 3 , a clamping jaw movable on the guide tube along its axial extent 4 which have one in the guide tube 3 centrally located adjustment spindle 5 is acted upon, and one is pivotable on the guide tube 3 arranged welding device 6 ,

Fixed clamping jaw 2 and movable jaw 4 are parallel to each other and perpendicular to the longitudinal axis x of the guide tube 3 aligned. Every jaw 2 . 4 has x adjustable clamping elements transverse to the longitudinal axis 2 ' respectively. 4 ' on. In the illustrated embodiment, the clamping elements 2 ' respectively. 4 ' on the jaws 2 or guided, as shown - in a dovetail-shaped guide. These are pairs of clamping elements for clamping a tubular part 2 ' respectively. 4 ' synchronously via a spindle with opposite thread formations 7 movable for tensioning or loosening. As shown in the illustrations, the clamping elements 2 ' respectively. 4 ' Be V-shaped. This enables centric clamping of tubular parts with different nominal diameters.

Fixed clamping jaw 2 and guide tube 3 are positively connected to each other, which is why the guide tube on the outside of the jacket on the fixed jaw 2 facing end area an external thread 8th has, which in one, in a broad side of the fixed jaw 2 trained ring groove internal thread 9 intervenes.

Coaxial to the guide tube 3 in this is the adjusting spindle 5 arranged. This is at one end in a stepped bore 10 the fixed jaw 2 rotatably supported. The opposite end preferably passes through a cover section 11 of the guide tube 3 what lid section 11 a sleeve guide for the adjusting spindle 5 ausformt. The axial lock of the adjusting spindle 5 is due to positive locking in the area of the stepped bore 10 reached.

That over the lid section 11 free end of the adjusting spindle protruding from the guide tube 5 is designed to actuate the same, for example for manual actuation by means of a crank or the like or also as from the EP 0 793 572 B1 known to attack an electric motor.

Over the outer surface of the guide tube 3 is the movable jaw 4 through a hole 12 guided. Longitudinal to the axis x of the guide tube 3 one runs in the direction of the clamping elements 2 ' respectively. 4 ' directional reach-through slot opening 13 , which extends almost over the entire length of the guide tube 3 leaving areas not slotted on both ends.

For rotating support of the movable jaw 4 grips them with a feather-like part 14 into the reach-through slot opening 13 on.

In the guide tube 3 there is also a slider 15 which is in the guide tube 3 and on a threaded engagement to the lead screw 5 standing driver part 16 is slidably mounted.

The driver part 16 has measured in the axial direction approximately opposite the slider 15 twice the length. The driver part has ends on both sides 16 one radial collar each 17 . 18 , In a basic position according to 1 this is due to the in the feed direction r of the tensioning device 1 pointing end of the driver part 16 arranged radial collar 17 inside of the collar on the assigned end face of the sliding piece 15 on. On the opposite side of the slider 15 is between this and the removed radial collar 18 one, the driver part 16 comprehensive compression spring 19 arranged. The loading of the driver part 16 and over it the movable jaw 4 consequently takes place indirectly via the driver part when the spindle is actuated 16 and the on the slider 15 acting compression spring 19 ,

The two radial collars 17 and 18 serve to limit the glide path of the slider 15 on the driver part 16 ,

On the movable jaw 4 is also an outside of the guide tube 3 arranged welding depth gauge 20 aligned parallel to the longitudinal axis x and in the longitudinal extension of the guide tube 3 adjustable holder.

Between fixed jaws 2 and movable jaw 4 is the welding device 6 arranged, which match the existing nominal widths of the pipes to be welded in the illustrated embodiment with a heating mandrel 21 and a heating sleeve attachment 22 is equipped. The welding device 6 is on a pivoting lever 23 trained holding part 24 removable or swiveling arranged. The holding part 24 is here on the guide tube 3 axially displaceable and by engaging in the reach-through slot opening 13 of the guide tube 3 secured against rotation. The swivel path is limited by a stop, not shown.

For welding a plastic pipe 25 with a plastic sleeve 26 will proceed as follows:
The pipes are suspended, for example running under a ceiling, in previously attached pipe supports or pipe clamps and, as far as possible with the support used, aligned coaxially with one another.

The fitting side to be connected 27 the plastic sleeve 26 is in the clamping elements 2 ' the fixed jaw 2 clamped so that the opening of the plastic sleeve 26 the pipe end 28 of the plastic pipe 25 is facing. The plastic tube 25 is here between the clamping elements 4 ' the movable jaw 4 guided.

The entire tensioning device 1 is overall free on the pipe ends or on the plastic pipe 25 and the plastic sleeve 26 accordingly, it hangs freely in the illustrated embodiment on the pipe structure suspended from a ceiling. The longitudinal axis x of the guide tube 3 extends parallel to the pipe axis y.

The two jaws 2 and 4 are so far apart that the nominal depth-dependent welding depth gauge 20 can be set according to the nominal size to be processed.

The movable jaw 4 as long as in the direction of arrow r on the fixed jaw 2 by turning the adjustment spindle 5 moved until the path through the weld depth gauge 20 is limited. The pipe end to be welded 28 is against the plastic sleeve 26 brought into stop and by moving the clamping elements together 4 ' clamped. The entire tensioning device 1 now hangs freely on the pipeline. The welding depth gauge 20 is then the effective range of the movable jaw 4 taken. Because the centers of the clamping elements 2 ' and 4 ' the fixed jaw 2 and movable jaw 4 lie on the pipe axis y, the center points of the clamped plastic sleeve now lie 26 and the plastic tube 25 exactly on the pipe axis y.

The one with the matching mandrel attachment 21 and heating sleeve attachment 22 provided welding device 6 after the jaws have been moved apart 2 . 3 between the plastic sleeve 26 and the plastic tube 25 swiveled in and switched on. The welding device 6 heats the mandrel attachment 21 and the heating sleeve attachment 22 to the material-specific temperature to be welded. The movable jaw 4 will move towards the fixed jaw 2 (Arrow r) moves, so the mandrel 21 into the plastic sleeve 26 and the heating sleeve 22 on the pipe end 28 can be pushed to the nominal welding depth and heat it up. Because the heater attachments 21 . 22 opposite the pipe end 28 and the plastic sleeve 26 If they are oversized, they can only be pushed onto or into them as they are through the heating attachments 21 . 22 are heated and the oversize material melts. To the heating attachments 21 . 22 up to the respective welding depth on or into the pipe end 28 or plastic sleeve 26 to bring a continuous pressure is necessary. This force is from the compression spring 19 rendered between the slider 15 and the radial collar forming a stop 18 located.

After the material and nominal width-specific heating time has elapsed, the clamping jaws 2 . 4 as far apart as possible.

To ensure that the heater tops 21 . 22 from or from the pipe end 28 or plastic sleeve 26 pulled, receives the holding part 24 an axial maximum travel path in the direction of the movable clamping jaw 4 , This is achieved, for example, in that the holding part 24 with a pen 29 in a further groove aligned parallel to the longitudinal axis x 30 of the guide tube 3 to be led. The groove length is at least equivalent to the welding depth of the largest with the tensioning device 1 nominal size to be processed.

The holding part 24 and the movable jaw 4 are with a device, not shown 31 connected to one another in such a way that the movable clamping jaw 4 holds the holding part apart 24 pulls after the movable jaw 4 so far from the holding part 24 is that the plastic tube is removed 25 completely from the heating sleeve attachment 22 was pulled.

The welding device 6 is about the swivel lever 23 of the holding part 24 from the effective range of the movable jaw 4 pivoted.

The movable jaw 4 is then so far in the direction of the fixed jaw 2 proceed so that it comes to rest against it, with the externally heated pipe end 28 according to the nominal width-related welding depth into the inside of the molded part 27 the plastic sleeve 26 penetrates.

The welding device 6 can from the pivoting lever 23 be removed.

After the nominal cooling time has expired, the clamping jaws can 2 . 4 by turning the adjustment spindle 5 be opened and the tensioning device 1 be removed from the completed connection.

All parts of the tensioning device are preferred 1 If possible in terms of construction and manufacturing technology, made from high-strength, light and corrosion-resistant material, preferably from aluminum.

By using a central guide tube 3 with reach-through slot opening 13 and internal adjustment spindle 5 is a very compact design. By accommodating a molded part in a fixed clamping jaw 2 , which is smooth, flush and narrow in the direction of the molded part, ensures that the molded part is clamped in any position.

All disclosed features are (in themselves) essential to the invention. In the disclosure of the application is hereby also the disclosure content of the associated / attached priority documents (Copy of the pre-registration) fully included, too for the purpose of features of these documents in claims of this Registration included.

Claims (14)

Process for welding plastic pipes ( 25 ), the plastic pipes ( 25 ) are pre-installed, for example, by hanging from a ceiling, with one for bringing the pipe ends together ( 28 ) sufficient freedom of movement, characterized in that a tensioning device ( 1 ), the two jaws ( 2 . 4 ), each with a jaw ( 2 . 4 ) at one of the pipe ends ( 28 ) and the jaws ( 2 . 4 ) then while the tensioning device ( 1 ) free at the pipe ends ( 28 ) is held for welding the pipe ends ( 28 ) are moved towards each other. Method according to claim 1 or in particular according thereto, characterized in that the clamping jaws ( 2 . 4 ) via only one adjustment spindle ( 5 ) can be adjusted to each other. Method according to one or more of the preceding claims or in particular according thereto, characterized in that a on the clamping device ( 1 ) held welding device ( 6 ) to prepare the connection of the pipe ends ( 28 ) aligned between the pipe ends ( 28 ) is pivoted. Bracing device ( 1 ) for welding plastic pipes ( 25 ), with two jaws ( 2 . 4 ), at least one is movable and one is the jaws ( 2 . 4 ) adjusting spindle ( 5 ), characterized in that the clamping jaws ( 2 . 4 ) transverse to the axis (y) of the pipe ends to be welded ( 28 ) adjustable clamping elements ( 2 ' . 4 ' ) having. Bracing device according to the features of the preamble of claim 4, characterized in that between the clamping jaws ( 2 . 4 ) one in alignment with the pipe ends to be welded ( 28 ) swiveling welding device to be brought ( 6 ) is arranged, which is also on the clamping device ( 1 ) is supported. Bracing device according to the features of the preamble of claim 4, characterized in that the clamping device ( 1 ) in the area of the adjustment spindle ( 5 ) is designed for gripping the hand. Clamping device according to one or more of claims 4 to 6, or in particular according thereto, characterized in that the movable clamping jaw ( 4 ) due to a preload spring ( 19 ) can also be moved in the clamping direction (r) without (further) spindle adjustment. Bracing device according to one or more of claims 4 to 7, or in particular according thereto, characterized in that the adjusting spindle ( 5 ) from a pipe ( 3 ) is covered, which also serves as a rotating support for the movable clamping jaw ( 4 ) and / or the welding device ( 6 ) serves. Bracing device according to one or more of claims 4 to 8, or in particular according thereto, characterized in that the tube ( 3 ) a reach-through slot opening ( 13 ), which in any case extends over the adjustment length of the movable clamping jaw ( 4 ) extends. Bracing device according to one or more of claims 4 to 9, or in particular according thereto, characterized in that the slot opening ( 13 ) on the top, the clamping elements ( 2 ' . 4 ' ) is designed facing. Bracing device according to one or more of claims 4 to 10, or in particular according thereto, characterized in that the clamping elements ( 2 ' . 4 ' ) via a counter-rotating thread ( 7 ) can be moved for clamping or releasing. Bracing device according to one or more of claims 4 to 11, or in particular according thereto, characterized in that the welding device ( 6 ) is arranged to be adjustable in the direction of the adjusting spindle. Bracing device according to one or more of claims 4 to 12, or in particular according thereto, characterized in that the welding device ( 6 ) in the axial direction of the adjusting spindle ( 5 ) and in the opening travel direction of the movable jaw ( 4 ) can be moved with limited stroke. Bracing device according to one or more of claims 4 to 13, or in particular according thereto, characterized in that the welding device ( 6 ) at least over part of their travel distance in the opening travel direction of the movable clamping jaw ( 4 ) from the movable jaw ( 4 ) is dragged along.