JPH0247000Y2 - - Google Patents

Description

[Detailed Description of the Invention] Industrial Application Field The present invention provides a handle having a support rod, a container for swelling welding agent attached to the handle, and a conduit for uniformly swelling welding the overlapping seams of plastic strips. The present invention therefore relates to a manual device having a swelling agent application nozzle connected to a container, the opening of which is oriented towards a flat brush mounted on a support rod.

PRIOR ART Transportable swelling welding devices are described, for example, in German Patent Application No. 1704056, and manual devices are described, for example, in German Patent Application No. 1704056.
Described in No. 2459208.

The joining technique of swelling welding is a joining technique that has proven effective for several years in the case of plastic strips whose dissolution can be initiated using solvents. This bonding technique is used in particular in civil engineering to obtain seals on the job site. However, the weldability of plastic strips varies considerably, especially at temperatures lower than 20°C or 15°C, so that especially in cold seasons it is necessary to It is necessary to preheat the body. This preheating is often carried out at the construction site using hot gas blowers or even using open flames. In both of these cases, most of the heat is lost unused rather than being utilized to heat the joint surfaces, and this generally means that the swelling welding agent is flammable. It is also extremely dangerous.

Problems to be Solved by the Invention The problem of the invention is to provide a heating device by means of swelling welding, in which a uniform seam connection is to be achieved even in the case of unsatisfactory environments, i.e. too low working temperatures. It is obtained in conjunction with a manual device for obtaining a joint seam. This manual device is used in particular in locations that are inaccessible or difficult to access with large transportable devices, such as corners and connections.

Means for Solving the Problems According to the present invention, the set problem is solved by the fact that the heating plate is disposed parallel to the flat brush and is connected to the support rod. be done. Preferably, the heating element according to the invention comprises:
For example, it consists of an electrically heatable metal surface, with which the edge surface is preheated immediately before applying the swelling welding agent to the edge surface in the immediate joining area. Immediately following the preheating, the application of the swelling agent and the immediate subsequent crimping of the wet joint surfaces, i.e. the edges of the plastic strips, ensure a tight seam connection without defects using the manual device according to the invention. guaranteed. The heatable heating plate can have an anti-stick layer to prevent sticking of the plastic strip to be heated. The heating power of the heating plate can also be designed to be adjustable, so that the temperature of the heating device can be limited, so that, for example, the ignition temperature of the swelling welding agent is not reached.

According to one preferred embodiment of the invention, it is provided that the heating plate is formed at right angles and is fixed in the plug-in joint plate of the support rod with the legs of the L-profile.

A heating plate, an applicator for the swelling welding agent, a container for the swelling welding agent and at the same time a pressure roll which allows simplified guidance are preferably fixed to the support rod of the manual device. The fixing can take place by at least partially surrounding the support rod from the outside and/or by inserting, for example, a receptacle or the like into the support rod. The support rod can also be formed hollow as a casing.

In order to ensure uniform heating of the joint surfaces, the manual device can also have a pivotably formed flat brush on the front side of the heating plate, which flat brush can press the plastic in the working position of the manual device. The upper surface of the strip is pressed and at the same time the joint surfaces are pressed together or evenly against the heating plate.

Swell welding becomes effective because the pressure roll ensures the task of obtaining wet edge-to-edge, ie joint surface-to-joint contact immediately after application of the swelling welding agent. Manual devices are moved by sliding or sliding motions. The pressing force of the pressing roll on the joint surface is determined by the user's individual handling and holding of the manual device. Furthermore, the fixing of the edges of the strip is also ensured by the pressure rolls, allowing sufficient guidance and easy sliding. The manual device according to the invention for swelling welding can also be used for joining plastic strips of the type of heated wedge welding. In the case of heated wedge welding of plastic strips, the joint surfaces are generally plasticized by heat, ie heated wedges, and then welded together by compression. Furthermore, when using a manual device, the working direction of this device is reversed and the applicator is used for so-called primer application as a dissolution initiation effect instead of a swelling welding agent, and heating with a heating wedge is A plasticized state of the plastic strip is brought about by means of a hot plate in the welding area, so that an improved weld bond is produced after so-called hot wedge welding due to the weld initiation effect.

Example Next, the present invention will be explained in detail with reference to the drawings.

Figure 1 shows a manual device for swelling welding plastic strips (also called a seam joining device).
Two preferred embodiments are schematically shown in perspective view. The working direction, ie the direction of movement, of the seam joining device is represented by the arrow A, in which case the device is moved by sliding or sliding by grasping the handle 1 by the user. This manual device has a support rod 3 with an end 1 at the extension of the handle 1.
4 is inserted and fixed. A pressing roll 12, a swelling welding agent applicator having a flat brush 3, a heating plate 9, and a rotatable flat brush 11 are attached to the support rod 2 in order from rear to front in the working direction. This manual device comprises, in the direction of the arrow A, a flat brush which presses against the upper surface of the upper layer of the plastic strips in the welding region, and a flat brush and a heating plate which are guided between the two plastic strips in the welding region. In addition, the pressing roll can be guided so that it is again guided to the upper surface. The flat brush 3 that applies the swelling welding agent is connected to the support rod 2 through the support joint plate 6.
The bristles of the flat brush thus extend transversely to the direction of forward movement, ie the working direction. Attached to the extension of the support seam plate with the U-shaped receptacle 61 is a container 5 for swelling welding agent, for example via a support rod, the opening of which is connected to the application nozzle 4 via a conduit 7. are combined. This supply pipe 7 for the swelling welding agent is equipped with a valve 8 for regulating the quantity. The applicator nozzle 4 is formed as a longitudinal slit and, as shown in the drawing, covers the entire width of the flat brush transversely to the brush spreading direction, so that the entire flat brush is uniformly swollen and welded. and is arranged to supply the agent. Immediately before the flat brush 3, that is, immediately before the flat brush 3 in the working direction, the heating plate 9
The support rod 2 is designed, for example, as an L-profile, so that the support rod 2 is guided parallel to the brushes of the flat brush 3 together with the heating surface at a distance and can be introduced at the same time into the overlap seam. is fixed. This heating plate can be heated, for example, by a current supply line 10. The heating plate 9, which is designed as an L-profile, can be fixed in a plug-in joint plate 21 formed, for example, at the end of the support rod, through which the current supply and heating can take place. You can also do it. On the front side of this manual device there is a holding device for the plastic strips to be welded and heated.
For example, they can be arranged in the shape of a flat brush 11. The flat brush 11 can be fixed so that it can turn in the direction of the arrow, in which case the bristles of this brush are
When the bristles rotate the flat brush to a vertical position, the heating plate 9
and is curved so as to extend parallel to the flat brush 3 and lie flat on the upper surface of the plastic strip. Furthermore, the supply pipe 7 is guided into a seam plate 22 which is fastened at right angles to the support seam plate 6 . A plastic strip, not shown in FIG. 1, is guided above and below the heating plate 9 and the flat brush 3. Only after leaving the pressure roll 12 do the joint surfaces of the plastic strips overlap again.
The pressure roll 12 can hold the surface moistened with the swelling welding agent in that state and can be permanently connected by swelling welding.

In the case of FIG. 2, it can be seen schematically in the sectional view that the heating plate 9, for example a copper plate, protrudes between the plastic strips 15 and 16 to be joined together, the joining surfaces being , 15a and 16
Indicated by a. Since only the joint surface is preheated by the heating plate 9, this joint surface quickly produces a uniform and satisfactory bond with the swelling welding agent applied directly thereon. Such a preheating of the plastics to be joined by swelling welding is advantageous, for example, in the case of strips based on ethylene-propylene rubber or chlorinated polyethylene. but,
This preheating can also be applied at temperatures as low as zero, for example when bonding plastic strips made of flexible PVC. FIG. 3 schematically shows the arrangement of the applicator for the swelling welding agent in the joint area between the plastic strips 15 and 16 to be joined together, in which case the swelling welding agent coming from the application nozzle 4 is shown schematically in FIG. passes into the next brush 3 or into the brush itself and is uniformly distributed by this brush within the joining area. In FIG. 4, it can be seen schematically that the joint surfaces 15a and 16a of the plastic strips 15 and 16, which have now begun to melt with the swelling welding agent, join together to form a seam 17.

The manual device according to the invention can likewise be used to obtain overlapping seam connections by welding plastic tapes.

In the case of swelling welding, the bond between the plastics is
This is obtained by "swelling", ie dissolution with a solvent, which subsequently evaporates again, especially at room temperature. Hot wedge welding, on the other hand, is based on plasticizing plastics with heat. The manual device according to FIG. 1 can be used for heated wedge welding, preferably in the direction opposite to the working direction arrow A;
In this case, the heating plate 9 is heated appropriately. By applying a small amount of solvent with the applicator nozzle 4 on the flat brush 3 before plasticizing the joint surfaces 15a, 16a, good welding of the heat-plasticized joint surfaces results. The swiveling flat brush 11 is kept out of service in this method of operation. This manual device advantageously has to weld small seam areas tightly and uniformly with great security. For example, it can be used everywhere that is not possible with large transportable devices.

[Brief explanation of the drawing]

FIG. 1 is a schematic perspective view showing the manual device according to the present invention, and FIGS. 2, 3, and 4 show the bonding process sequentially including heating, applying swelling agent, and compressing the bonded part. FIG. 2... Support rod, 3... Flat brush, 9... Heating plate, 12... Pressing roll.

Claims (1)

[Claims for Utility Model Registration] 1. A handle with a support rod for uniformly swelling welding the overlapping seams of plastic strips, a container for swelling welding agent attached to the handle, and itself connected to the container by a conduit. In a manual device having a swelling welding agent application nozzle, the opening of which is directed towards a flat brush mounted on a support rod, a heating plate 9 is arranged parallel to and parallel to the flat brush 3, and Manual device for homogeneous swelling welding of overlapping seams of plastic strips, characterized in that it is connected to a rod 2. 2. The device according to claim 1, wherein a pressing roll 12 is disposed on the opposite side of the flat brush 3 from the heating plate 9, and the axis of the pressing roll runs parallel to the bristles of the flat brush. 3. The device according to claim 1 or 2, wherein the heating plate 9 can be electrically heated. 4. The device according to claim 3, wherein the heating plate 9 has an anti-adhesion layer. 5. Any one of claims 1 to 4 of the utility model registration claims, in which the heating plate 9 is formed as an L-shaped member and is fixed in the insertion joint plate of the support rod by the leg of the L-shaped member. The device according to item 1. 6 Utility model registration claim 1, in which a rotatable flat brush is fixed to a support rod in front of the heating plate.
The device according to any one of paragraphs 1 to 5.