CS212966B1 - Device for longitudinal joining of unvulcanized rubber layers - Google Patents

Abstract

The invention concerns a device for joining unvulcanized rubber layers for the production of rubber conveyors with steel reinforcement, consisting of a joining tunnel, above which heated welding knives are placed, while a connecting element consisting of at least 4 conical rollers is attached under the joining knife. The essence of the invention is that at least two unvulcanized rubber layers are brought between a system of at least four conical rollers, the different peripheral speeds of which on the cone cause the layers to be pressed together, thereby achieving mutual longitudinal connection. The invention can be used exclusively in the rubber industry.

Description

BACKGROUND OF THE INVENTION The present invention relates to a device for the longitudinal joining of unvulcanized rubber layers used mainly in the manufacture of rubber belt conveyors with a steel structure, in which the individual layers move against a set of mutually rolling conical pulleys with different circumferential velocities.

At present, the rubber layers used in the manufacture of rubber belt conveyors fulfill the function of so-called cover layers. The width and thickness of the layer is determined by the rubber line, and in the case of the need for more widths it is desirable to join the individual layers together to form a single layer of greater width. So far, no device has been used for such coupling. In the manufacture of rubber conveyors, however, a long-lasting method of joining was used, so-called overlapping, in which two layers over a certain width were overlapped over time and under the action of pressure rollers, or pulleys-manually the joint was closed. The disadvantage of such bonding is that during the subsequent vulcanization, an accumulation of material has been formed at the bonding point, which has been extruded into non-recoverable technological waste. In the manufacture of rubber belt conveyors with a steel structure, where the steel ropes are guided in a long-term manner, the overlapping of the wire leads to an increase in the defect of the products.

These disadvantages are overcome by the device for the longitudinal joining of the unvulcanized rubber layers according to the invention, which consists of a connecting shaft above which are placed heated cutting knives, and below the connecting table there is a connecting element formed of a set of at least four conical pulleys. the two pulleys are fixed and the two pulleys are movable on the arm and each spring is connected to each other by toothing. The advantage of the connection according to the invention is that the longitudinal joint is continuous, there is no loss of material, and the conveyor structure and steel construction do not change the rope configuration. This joining also eliminates the finishing operation where the necessary technological waste resulting from the overlapping had to be trimmed. The device as well as its control is easy without the need to purchase other investments !.

Further applications of the present design of the device for the longitudinal bonding of unvulcanized rubber layers according to the invention for which protection is also required are mentioned in connection with the described embodiment. Such an example is illustrated in the accompanying drawings, wherein FIG. 1 schematically shows a device for joining unvulcanized rubber layers, and FIG. 2 shows in detail and schematically the connecting element.

Unwinding elements 10, 30 consisting of unwinding rollers 110, 310 and winding rollers 120, 320 and tensioning rollers 130, 330 provided with a textile wrap 140, 340 connected to a connecting table 80, above which are heated heated cutting knives £ 0, 60 wherein a connecting element 40 is attached below the connecting table 80. The connecting element 40 consists of four conical rollers 41, 42, 43 and 44 above which

212 966, a guide element 48 is disposed, wherein the rollers 44, 44 and 44 are fixedly fixed by the arm 44 and the sleeve 451 and the rollers 46, 52 are housed in a sleeve 471 which is connected via a coupling 472 to the arm 47 and screw 462. Each pulley spring is connected to each other by toothing 431, 441 and 411, 421. The arm 47 moves the pulleys £ 1, 42 in the horizontal direction while being secured by a spring £ 24 against spontaneous displacement. 4 are retained in the sleeves 471, 451 by means of screws 412, 422, 432 and 442, while the fluidity of movement is ensured by guide bushes 423, 433 and bearings 424, 425. 434 and 435.

Underneath the connecting element 40 is a dragging conveyor 35, carrying β tensioning rollers 91, 92 and a rubber layer 70 connected by an inclined conveyor 36 into the winding element.

20 consisting of a take-up roll 210, a take-up roll 220 and a tension roll 230, provided with a textile wrap 240.

From the unwinding rollers 10, 30, the goma layers 21, 72 are unwound in the direction of the bag and the textile wrapping inserts 140, 340 are unwound. The rubber layers 21, 72 are adhered to the joining table 80 and adjusted by the heated cutting knives 50. 60 At the same time, the rubber layer layer 70 is wound onto the rollers 120. 320. The rubber layers 21, 72 are fed vertically into the connecting element 40 between the set of four conical pulleys 64, 42. 44. The guide element 48 simultaneously ensures that the rubber layers 21, 72 are not overlapped. The thickness of the rubber layer 70 is secured by opening the conical pulleys 41, 42 by means of the movable arm 47 and the screw 462. 43 and 44 provided with 411 toothing.

441 causes the layers 21, 72 to squeeze together, thereby joining them together to form a separate rubber layer 22. 22 ^{, the} winding roller 210 does not know at the same time as the textile wrapper 240 to prevent it from sticking.

The device for joining unvulcanized rubber layers can be used wherever a rubber layer in maximum widths is required, with the possibility of using multiple devices side by side.

Example

For the production of a rubber belt conveyor with a steel structure, a 400 mm wide cover layer is prepared. Of two differently disposed unwinding rollers, 1300 mm wide layers are fed to the connecting stdl by means of conveyors. The excess Width is trimmed by means of heated trimming knives and the two layers are introduced in a vertical position between a set of four conical pulleys 3a rolling against each other so that two and two pulleys are connected by toothing, one pair being fixed and the other movable on the shoulder, thereby forming a slit according to the desired depth of joining

212 966 rubber unvulcanised layers. Above the set of pulleys there is a guide element at the same time preventing the possibility of overlapping the guide layers. The construction of the conical pulleys and hence their different peripheral velocity on the cone causes the layers to be pressed together, thereby joining them together. The bonded rubber layer is transferred by means of loading rollers and a conveyor to the winding point. Due to the high tackiness of the mixture, the rubber unvulcanized layers are unwound and wound together with a textile wrap insert preventing any sticking.

Claims (2)

A device for the longitudinal joining of unvulcanized rubber layers for rubber belt conveyors with a steel structure, comprising unwinding and winding elements, characterized in that it consists of a connecting gallery (80) over which heated cutting knives (50), (60) are placed, wherein, below the connecting table (80), the connecting member (40) is comprised of a set of at least four conical pulleys (41), (42), (43) and (44). Device according to claim 1, characterized in that the connecting element (40) consists of a system of at least four conical pulleys (41), (42), (43), (44) of which two and two pulleys are interconnected by toothing ( 411), (421) and (431), (441), the rollers (43), (44) being fixed and the rollers (41), (42) movable on the arm (47).