SU961989A1 - Tongs for welding polymer films - Google Patents

Description

(54) POLYMER FILM MITES

one

The invention relates to the field of welding of polymer films and can be used when packing products, as well as when welding polymer films in hard-to-reach places.

The known design of pliers for contact welding of thermoplastic blanks, containing two clamping clamps, having the ability to move along a common guide, and pivotally interconnected levers. An additional lever is connected to one of the levers by means of a joint, which is interconnected with it by means of a rack with a spring-loaded ratchet, which are designed to hold the main (power) levers in the collapsed (ts-boom) position. The dynamometer serves to control the compressive force of the polymer preforms 1.

The drawbacks of the device are design complexity and laboriousness of the welding process.

Pincers for welding of a polymer film are known, containing pivotally connected and interconnected by means of a spring arms, at the end of which there are fastened welding jaws with spring-loaded heating elements 2.

A disadvantage of the known tick design is that it does not allow to obtain high-quality double-sided shchi when welding polymer films due to the misalignment of the welding jaws along the length as a result of the jaws skewing due to the inevitable backlash in the connecting arm of the power levers.

A second disadvantage of the known construction is that its management is time consuming due to the large stroke of the levers when they are pressed by the hand.

The purpose of the invention is to increase the quality of the welded joint and reduce the complexity of the welding process.

Claims (2)

The goal is achieved by the fact that in ticks for welding a polymer film containing pivotally connected and interconnected through a spring levers, on the end of which are welding sponges with a spring-loaded heating element, one of the levers is made in the form of a T-shaped backstage and pivotally connected to it a lever link, and the second lever is provided with a protrusion pivotally connected to the T-shaped wings. In addition, at the ends of the welding jaws there are holes in which spring-loaded pins are installed, and the heating elements are fixed on the said pins. FIG. 1 shows pliers for welding polymer films; general view; on fits. 2 shows a section of a welding sponge. Pliers for welding polymer plexes, knob consist of a lever 1 (Fig. 1) and a lever link 2, which are interconnected by means of a joint 3. Lever link 2 is connected to a T-shaped slide 4 by a hinge 5. The lever 1 is made with a protrusion 6, pivotally connected to the T-shaped slide 4. The lever 1 and the lever link 2 are interconnected by means of a stretching spring 7. One of the welding jaws 8 is fixed at the end of the lever 1, and the second welding jaw 9 - on the T-shaped link 4. The welding jaws (Fig. 2) are made in the form of plates 10 of electrically insulating material, For example, textolite. At the end of each of the plates 10 there are holes 11, in which the springs 12 are spring-loaded but for fixing and fixing the heating elements 13, made in the form of nichrome tape 14 of the welding process control, the neon light comes on). After the welding time has expired, the neon light goes out, thus signaling the end of the process. At the same time, the voltage is removed from the welding electrodes. The cycle is over. Performing one of the levers as a composite of the T-shaped link 4 and the link link 2, as well as fastening the latter to the lever 1 using two hinges 3 and 5, increases the convergence of the flat surfaces of the electrodes of the welding jaws 8 and 9, which improves the quality of the welds produced. The double-sided weld is uniform, of constant width. The proposed design of claws makes it possible to reduce the stroke between lever 1 and lever link 2 when they converge and diverge, which contributes to less fatigue of the hand when working with a tool, i.e. reduce the complexity. The presence of spring-loaded pins 12 in the holes 11 of the plates of the welding jaws 10 allows the heating elements in the form of nichrome tapes to always be in a tensioned state, even during the thermal expansion of the electrodes at the time of welding, which is also an indispensable factor for high-quality welds . The proposed design of mites for welding polymer films is very convenient to use when packing large-sized products into a polymer film by means of a hermetic casing. Pincers make it possible to obtain high-quality welded shields, which guarantees the safety of products during their transportation and storage. Claim 1. Ticks For welding polymer films, which are pivotally connected and interconnected by means of a spring, levers on which are welding sponges attached with a spring-loaded heating element, characterized in that, in order to improve the quality of the welded joint, one of the levers is made in the form of T- shaped backstage and pivotally connected with her lever link, and the second lever is made with a protrusion, pivotally connected with the T-shaped wings. 2. Pliers according to claim 1, characterized in that the ends of the welding jaws are provided with holes in which spring-loaded pins are installed, and the heating elements are fixed on the pins mentioned above. Sources of information taken into account in the examination 1. USSR author's certificate number 3387401, cl. B 29 C 27/02, 27.04.70. 2.Smotrina A. A. and V. Kosovtseva. Tools and equipment developed by innovators of Leningrad enterprises. Ed. ADPSP of the Leningrad Oblast Organization “Knowledge, RSFSR, 1976 (prototype).