DE2153007A1 - Pipe welding clamping unit - esp for holding large thermoplastics pipes for welding in trenches - Google Patents

Abstract

A pipe holding and guiding apparatus comprises pairs of upper and lower shells to hold the pipe ends, the upper shell being of smaller arc (e.g. 120 degrees). The lower shell is suspended from the upper, the upper from a rigid frame by pivoting links permitting the axial approach of the pipes. A connecting rod linking two cranks, one attached to a pivoting arm of one pipe support, the other to a pivoting arm of the other pipe support, ensures symmetrical approach of the pipes ends towards each other under the action of rams. The lower shells (of larger arc) are closed around the pipe in a pincer action by lever arms extending above the pipe from the sides of the shell and pulled together by hydraulic jacks.

Description

Device for coaxial clamping and tubing of tubes made of plastic materials in pressure butt welding The invention relates to a device tin coaxial Tensioning and clocking of pipes made of plastic materials during pressure butt welding, the Clamping shells sum clamping the pipe ends and a lever system for coaxial mutual Has moving the pipe ends.

Devices for the pressure butt welding of pipes are known made of thermoplastic materials, in which clamping devices to hold the Pipes are attached to a machine bed and with the help of straight guides are moved against each other.

In one embodiment, the tubes are also sewn in half-length and braced by chains. Other clamping devices are prismatic or as Pipe clamps formed. The tension around the pipes is done either by means of bxdrauliach or pneumatically operated clamping cylinder or by clamping screws.

Milk was proposed grasping rectilinear cylindrical Body by means of articulated, force-diverting and angled gripper claws that are in a vertically displaceable, rigid gripper part are arranged.

Mechanical ones are used to advance the clamping devices against each other Lever systems or hydraulically or pneumatically operated working cylinders.

Height-adjustable roller blocks are used to move and align the pipes used. The adjustment to different pipe diameters is done through the pipe clamps screw-in clamping rings or by exchanging the clamp pairs.

It has already been suggested two clamps with two on either side of the pipe arranged, double-sided operable hydraulic working cylinder associate. If the design is sufficiently stable, the pipes will be guided coaxially and fixing the hydraulic working cylinders. For rough assembly work will However, suggested additional guidance by means of appropriate guide rods. The hydraulic working cylinders are articulated with the clamps, to avoid jamming. The arrangement of the guide rods takes place in the sluggish of the sliding elements to allow the heating element to be unhindered in and out to enable.

The devices described have the defect that they as a result due to their high mass, they are too unwieldy for use on construction sites. Especially at the pressure butt welding of pipes of larger nominal sizes requires extensive Depressions and widenings of the pipe trench over that for laying the pipes To make the unhandlinchen and To be able to use expensive devices. This lack becomes special Obviously, the laying and welding of the pipes in heavily built-up areas must be made, in which extensions of the pipe trench are often impossible.

In addition to the unwieldy and complex construction of the devices Their sensitivity to corrosion and dirt proves to be disturbing. Endangered are in particular the structural parts below the pipes to be welded like the machine bed as well as the guiding and tensioning elements. In this context it has been found that to move the self-tensioned pipe ends against each other used rectilinear guides particularly difficult from dirt and mechanical Damage caused by sliding earth or rubble must be covered up and through Corrosion and wear easily lose their functionality. The consequences often costly work interruptions. Further disadvantages of the known and proposed Devices are that the laying and tensioning of the pipes in the pipe trench is time-consuming manual exercises also require adaptation to different pipe diameters is expensive and in particular the bracing of the pipes with chain deformations the round cross-section cannot be excluded.

There are disadvantages in the device, which is designed in the form of a forceps that a perfect alignment of the two pipes to be connected through the device is not secured and by additional means, e.g. adjustable roller blocks, must be achieved.

The purpose of the invention is to avoid expensive and unwieldy constructions as well as dirt, wear and corrosion the tension and guide elements, from time-consuming manual handling and additional enlargements and depressions of pipe trenches Thermoplastic pipes To be able to join materials.

The invention is based on the object of a ungs- and clamping device for the butt welding of pipes of thermoplastic materials, which is mechanized and deformation-free, coaxial clamping and tubing of the pipe ends to be joined both in narrow pipe trenches and construction pits as well as in the Workshop or on level ground permitted.

It has been found that deformation-free clamping and coaxial Clocks of the two pipe ends to be welded is achieved in that the pipe ends be picked up by clamping devices, which each consist of three shells: the rigidly arranged central clamping collar and the two pivoting lower clamping shells The two swiveling lower clamping shells each have a rigid clamping shell lever provided, the ends of which are above the central clamping shell by means of a hydraulic or pneumatically operated clamping cylinder are connected. With a selection of the middle clamping shell '1200, same lever lengths and dimensions of the lower clamping shells the pipe ends are properly centered during clamping. The middle clamping shells are suspended from a frame at four points using rocker arms. the Rocking levers are rotatably mounted on the frame and on the central clamping shells. The movement of the two clamping devices towards the middle and the movement in opposite directions is effected by hydraulically or pneumatically operated working stroke cylinders, which with one end on the respective narrow side of the frame and with the other End are attached to the middle clamping shells.

In order to synchronize both clamping devices when moving to the To reach the middle and in the opposite direction of movement are those of the Center-facing rocker arm via a coupling and rigidly connected crank arm connected to one another in such a way that upon movement of one crank lever, the second always performs the opposite rotational movement. Preferably the crank levers when the rocker arm is in a vertical position, it forms an angle of 900 with the coupling.

It is also possible to synchronize the clamping devices Center and their opposite movement by two fixed on the rocker arm shafts, to achieve meshing gear segments.

To adapt to different pipe diameters, the clamping shells Passport segments inserted. Furthermore, a suspension is provided on the frame, which On the one hand, it enables the device to be installed in pipe trenches by means of lifting devices and to bring in construction pits and the other hand by their bow-shaped training does not hinder the introduction and removal of the heating element.

The suspension of the clamping shells on four rocker arms each is guaranteed compliance with the required coaxial clamping and guidance of the pipes. she makes all dirt and corrosion sensitive, straight guide elements as well every machine bed below the pipes to be welded is superficial. The dimensioning and the shape of the clamping shells also ensures secure, deformation-free clamping the pipe ends. The lack of a machine bed below the one to be welded Pipes make it possible to use the device by means of lifting devices and to operate without deepening and widening the pipe trenches. Also ensure the mounting of the rocker arm on a frame and the opening mechanism of the Clamping shells that the device after dismantling the suspension with the frame Can also be used below in stationary operation on pre-assembly platforms and in workshops is.

The invention is to be described in more detail below on the basis of two exemplary embodiments explained. The accompanying drawings show: FIG. 1: front view; FIG. 2: side view of FIG. 1; 3: front view; Fig. 4: Example of use of the Device in pipe trenches; Fig. 5s example of use of the device with stationary Operation Embodiment 1: Rocking levers 2 can be pivoted on a frame 1 stored.

The middle clamping shells 3 of the clamping device are attached to the rocker arms 2 suspended The lower clamping shells can be swiveled on the middle spaun shells 3 8 attached. The rigid clamping shell levers located on the lower clamping shells 8 9 are at their ends above the middle clamping shells 3 by clamping cylinders 10 connected, which by their working stroke a closing of the pivotable lower Clamping shells 8 and thus a bracing of the tubes 14 cause. tie in customization different pipe diameters is achieved in that in the clamping shells 3 and 8 PaBaegmente 13 are inserted.

The rocker arm 2 facing the center are via lifting shafts 4 and Crank lever 5 connected to one another by the coupling 6 and cause in connection with the working stroke cylinders 11 between the narrow sides of the frame 1 and attack the tops of the middle clamping shells 3, a synchronism of the clamping shells 3 8 towards the middle or their opposite movement.

In the Ausftihg according to Fig. 4, a bracket-shaped suspension is on the frame 1 12 attached, which allows the device to be introduced into pipe trenches. To Dismantling the suspension 12 is a stationary operation according to the design 5 possible in that the frame 1 is used for installation.

Embodiment 2: In another embodiment, corresponding to Fig. 3, the rocker arms 2 facing the center are attached to the lever shafts 4 Gear segments 7 coupled and effect in connection with the working stroke cylinders 11 between the Narrow sides of the frame 1 and the upper sides attack the middle clamping shells 3, a synchronism of the clamping shells 3; 8 after the middle or their opposite movement.

Claims (3)

Patent claims: Ii. Device for the coaxial clamping and guiding of pipes made of plastic materials in pressure butt welding, characterized by being pivotable on a frame (1) mounted rocker arm (2) suspended central clamping shells (3), which are movable lower clamping shells (8), which in turn with rigid clamping shell levers (9) are provided, the ends of which are above the central clamping shells (3) by clamping cylinders (10) are connected, as well as in that the rocker arm facing the center (2) by means of a lever system consisting of rigidly attached to lever shafts (4) Crank levers (5) and a Xoppel (6), are coupled and in connection with between the narrow sides of the frame (1) and the upper sides of the middle clamping shells (3) attacking working stroke cylinders (11) a synchronism of the clamping shells (3 8) after cause the center or their opposite movement. 2. Device for the coaxial tensioning and pulling of pipes made of plastic materials in the press butt welding, characterized in that those facing the center Rocker arm (2) coupled by gear segments (7) attached to the lever shafts (4) will. 3. Apparatus according to claim 1 and 2, characterized in that a bow-shaped suspension (12) is attached to the frame (1). 4, device according to claim 1 to 3, characterized in that in the clamping shells (3 8) fitting segments (13) can be attached.