RU2392399C1 - Welding apparatus for polymer membranes - Google Patents

Abstract

FIELD: construction.

SUBSTANCE: welding apparatus for polymer membranes comprises trolley with at least two pressing rolls. There is a sleeve fixed on trolley joined with source of hot air and ending with L-shaped slot nozzle with holes. One end of nozzle is put onto sleeve, and the other one - working one - in process of welding is located between welded edges of membranes. Working end of nozzle has two faces meeting at the sharp angle. Lower face is parallel to basic surface, on which trolley rides, and upper one is arranged at the angle of α=2÷4° to it. On upper face at the distance S from each other there are four rows of hot air supply parallel to flow. In each row via distance H=(1.2-÷1.5)S there are four holes provided. At the lower face there are similar rows of openings arranged.

EFFECT: improved quality of welding.

2 cl, 4 dwg

Description

The invention relates to construction and can be used for roofing.

A welding machine for polymer membranes is known, comprising a trolley with pressure rollers, on which a sleeve is attached, connected to a hot air source and ending with a L-shaped crevice nozzle with holes, one end of the nozzle being put on the sleeve, and the other in the welding process located between the welded edges membranes (see patent SU 1641987, CL. E04D 15/06, publ. 04/19/1991). A disadvantage of the known device is the inefficient distribution of the flow of hot air and, as a consequence, insufficiently strong connection of the membranes using such an apparatus.

The objective of the invention is to remedy these disadvantages. The technical result is to improve the quality of welding. The problem is solved, and the technical result is achieved by the fact that in the welding machine for polymer membranes containing a trolley with at least two pressure rollers, on which is fixed a sleeve connected to a source of hot air and ending with a L-shaped crevice nozzle with holes, moreover, one end of the nozzle is worn on the sleeve, and the other - the worker - is located between the edges of the membranes being welded during the welding process, the working end of the nozzle has two edges converging at an acute angle, the lower of which is parallel to the bases on the upper surface, on which the trolley rolls, and the upper one is located at an angle α = 2 ÷ 4 ° to it, on the upper face at a distance S from each other there are four rows of hot air supply parallel to the flow, in each of which through the distance H = ( 1,2 ÷ 1,5) S there are four openings, similar rows of holes are made on the lower edge, while the distance between the central ones is 1.5S, and the distance from the central rows to the extreme ones is S, the diameter of the four central holes of each face 1.5 times the diameter of the remaining holes and the lower face of the nozzle extends beyond the upper by a value of b = 0.5S and is equipped with a shoulder located between the two central rows of hot air supply. The rear roller in the direction of travel is preferably rotatable around a horizontal axis and provides guaranteed clamping of the membranes when deviating from the flatness of the base surface.

Figure 1 shows a General view of the proposed device;

figure 2 - L-shaped crevice nozzle, side view;

figure 3 is the same, a top view;

figure 4 is the same, bottom view.

The trolley 1 of the welding machine is equipped with a handle 2, pressure rollers 3 and a source of hot air 4. A sleeve 5 with a L-shaped slotted nozzle attached to the trolley 1 is connected to the source 4. One end of the nozzle is worn on the sleeve 5, and the other end is in the process welding is located between the welded edges of the membranes. The working end of the nozzle has two edges 6 and 7 converging at an acute angle. The lower face 6 is parallel to the base surface along which the trolley 1 rolls. The upper face 7 is located at an angle α = 2 ÷ 4 ° to the face 6. On the upper face 7 at a distance S Four rows of hot air supply parallel to the flow are arranged from each other. Four holes are located in each row through a distance H = (1.2 ÷ 1.5) S 8. Similar rows of holes 8 are made on the lower edge 6, while the distance between the central ones is 1.5S, and the distance from the central rows to the extremes is S. The diameter of the four central holes of each face is 1.5 times the diameter of the remaining holes. The lower face 7 of the nozzle extends beyond the upper 6 by a value of b = 0.5S and is provided with a shoulder 9. A shoulder 9 is located between two central rows of holes 8 for supplying hot air.

The device operates as follows.

The trolley 1 by the handle 2 is rolled along the edge of the welded polymer membrane. The crevice nozzle is located under this edge, between two membranes pressed against each other by one of the rollers 1. Hot air from the source 4 is supplied to the slot and the nozzle holes. In this case, the membrane section closest to the pressure point is melted by air from the gap, and the remaining part to the edge is heated by air from the holes. The size and direction of the slit, and, accordingly, the distribution of the air flow are determined by the mutual arrangement of faces 6 and 7 and are optimal under the indicated parameters. The geometry and location of the holes were empirically selected based on the need to ensure a strong connection without damaging the visible decorative surfaces of the membranes. The specified choice of the ratio of the distances between the rows and between the holes in the row provides the necessary local heating for a reliable connection, having a minimum length at a given width of the weld, which allows to increase the accuracy and accuracy of roofing. The presence in the center of the nozzle of broadened holes provides more efficient heating, which allows more securely fasten the edges of the seam. Burt 9, located on the lower edge 7 of the nozzle prevents touching this face and the base surface, while ensuring the necessary circulation of hot air near the surface and eliminating adhesion. The membranes heated in this way are pressed against one another by one or several rollers 3. Moreover, the rear roller in the direction of travel is rotatable around the horizontal axis and provides guaranteed clamping of the membranes when the base surface deviates from flatness.

All this allows to ensure a reliable tight connection of the membranes while maintaining the aesthetic appearance of the products.

Claims (2)

1. A welding machine for polymer membranes, comprising a trolley with at least two pressure rollers, on which a sleeve is attached, connected to a source of hot air and ending with an L-shaped slotted nozzle with holes, one end of the nozzle being put on the sleeve and the other - working - in the welding process it is located between the edges of the membranes to be welded, characterized in that the working end of the nozzle has two faces converging at an acute angle, the lower of which is parallel to the base surface along which the trolley rolls, and the upper is located at an angle α = 2 ÷ 4 ° to it, on the upper face at a distance S from each other there are four rows of hot air supply parallel to the flow, in each of which through the distance Н = (1,2 ÷ 1,5) S is located four holes, on the bottom face similar rows of holes are made, while the distance between the central rows is 1.5S, and the distance from the central rows to the extremes is S, the diameter of the four central holes of each face is 1.5 times the diameter of the other holes, while the lower edge of the nozzle stands for the upper and the value b = 0,5S and is provided with a shoulder located between the two central hot air supply rows. 2. The welding machine according to claim 1, characterized in that the rear roller in the direction of travel is made to rotate around a horizontal axis to ensure guaranteed clamping of the membranes when the base surface deviates from flatness.

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