RU2491215C1 - Thermo-blade of packaging machine - Google Patents

Abstract

FIELD: packaging industry.

SUBSTANCE: thermo-blade comprises a holder 1, pivotally 2 connected with a rest 3 mounted on the table, on which a plate 5 of porous heat-resistant and elastic material is fixed, coated at the top and on the sides of the rest with nonstick fabric. On the holder 1 a cutting element in the form of stretched continuous nickel-chromium thread is fixed which is located over the rest 3 with the ability of pressing of the cutting element to the nonstick fabric through the welded film. The ends of the cutting element are connected to the electric wires for supplying current for pulse heating of the cutting element. The positive electric wire is connected to the rest 3 and is attached to it, and the negative electric wire is connected to the cutting element. At the ends of the holder 1 the plates of dielectric material, for example, of cloth-based laminate, are fixed. In each plate from the side of its end a slot is made with a slider and a compression spring located in it, which is located in a compressed state between the slider and the end of the slot. The slider is mounted with its one end in the slot, and other - in the guide rail of the holder 1. On the slider a screw is mounted for mounting to the slider of the cutting element and the negative electric wire.

EFFECT: invention provides a simplified design, enhanced usability and reliability of work.

2 cl, 14 dwg

Description

The technical solution presented in this description relates to packaging machines for packaging products in shrink film, in particular to the thermal knives of these machines. It is intended for use in the field of technological equipment in the production of piece goods.

A device for packaging thermally adhesive material containing welding elements and a transverse cutting mechanism, including a retractable knife, a cutter in the form of sponges that are mounted on the carriage (RU 2165382 C1, B65B 9/06, 02/10/1998).

A device for splicing thermoplastic tapes containing a welding unit, a cutting tool consisting of heating elements (RU 99116015 A, BV 41/12, 05/20/2001).

A device for connecting the film (options) containing clamps, cutting knives, levers on which the heater and knife are installed (RU 2130411 C1, B65B 41/12, 05.20.1999).

Known thermal knife packaging machine containing heat sealing elements, cutting and stitching knives, providing the formation of two transverse edges of the package (RU 2391266 C1, B65B 9/06, 06/10/2010).

Known welding sponge of a packaging machine for making a weld in heat-sealable packaging material, containing clamps to the welded materials of the working surfaces and made in the form of a rod heater, characterized in that it contains a clamp located on the surface of the sponge indented from the heater and protruding above the sponge (RU 2005115841 A, B65B 1/22, 07.27.2006; RU 2348838 C2, F16B 11/00, B65B 51/22, 03/10/2009).

Known packaging machine with independent cutting and welding rods containing the first longitudinal and second transverse cutting and welding rods (RU 2008135949 A, B65B 9/06, 03/20/2010).

A device for welding a film containing clamps and a heater (RU 95117113 A, B65B 41/12, 12/27/1997) is known.

A packaging machine is known comprising welding and cutting units of a film, which are located separately from each other, respectively, above and below the window of the packaging machine and are arranged to move them towards each other, the cutting unit being equipped with a knife configured to extend it for film cutting (RU 71630 U1, 03.20.2008).

A device is also known in which there is a welding mechanism comprising a spring-loaded thermal knife pivotally connected to the rear wall of the fixed frame (RU 5171 U1, 10.16.1997).

A known installation for packaging products in shrink film containing mounted on the base of the heating elements, while along the perimeter of the lower part on two adjacent sides are linear heaters of the welding device made of nichrome wire (RU 95118220 A 10.10.1997).

Known technical solutions do not meet the requirements for the reliability of the thermal knives, which negatively affects the quality of the package. This is due to the fact that the known thermal knives are prone to stickiness from overheating of the film, and the rigidity of the mechanisms leads to uneven pressing of the thermal knives to the film, which also makes it difficult to work with the thermal knife.

The result of the invention is to improve the quality of product packaging and the reliability of the thermal knife.

The result is obtained by the thermal knife of the packaging machine, characterized in that it contains a holder hinged to the stop of the thermal knife that is mounted on the table of the packaging machine, a plate made of porous heat-resistant and elastic material is fixed on the stop, while the plate is coated on top and on the sides of the stop with non-stick fabric, the cutting element is fixed on the holder in the form of a stretched continuous nichrome thread, the holder is located above the stop with the possibility of pressing the cutting element to the non-stick fabric through welding film, the ends of the cutting element are connected to electric current supply wires for pulsed heating of the cutting element, the plus wire is electrically connected to the stop and fixed to it, and the minus wire is electrically connected to the cutting element, pads made of dielectric material, for example, PCB, are fixed at the ends of the holder , in each plate, from the side of its end, a nest is made with a slider and a compression spring located in it, which is in a compressed position between the slider and the end of the nest, olzun mounted at one end in a socket at the other end it is mounted in a guide holder, is mounted on the slider to the slide fastening screw of the cutting element and the minus electric wires for supplying current to the cutting element.

The non-stick fabric is fixed on the stop by clamping strips located on the sides of the stop and the screws attached to them, and these pads are fixed on the holder by screws located in the nests of the pads, which are filled with a dielectric cured composition, while the stop and the holder are straight in the top view or they are straight L-shaped.

Figure 1 shows the thermal knife packaging machine.

In Fig.2 - view A in Fig.1.

In Fig.3 - place B in Fig.1.

Figure 4 is a section bb in figure 1.

In Fig.5 is a section GG in Fig.1.

Figure 6 is a section DD in figure 2.

In Fig.7 is a cross-section EE in Fig.2.

In Fig.8 - place W in Fig.2 (enlarged).

In Fig.9 - place And in Fig.6.

Figure 10 - the cutting element of the thermal knife for cutting the film, mounted on the L-shaped holder of the cutting element (bottom view).

In Fig.11 - holder of the cutting element with a mechanism for raising and lowering the thermal knife (the front wall of the holder is conventionally not shown).

In Fig.12 - thermal knife packaging machine on the packaging table in the working position.

In Fig.13 - thermal knife packaging machine on the packaging table in the raised position.

On Fig - electrical circuit of the cutting element and the electromagnet of the mechanism for raising and lowering the knife.

The thermal knife of the packaging machine contains a holder 1 (FIGS. 1, 12), connected by a hinge 2 to the stop 3 of the thermal knife, which is mounted on the table 4 of the packaging machine. A plate 5 is mounted on the stop 3, made of a porous elastic dielectric material, while the plate is coated on top and on the sides of the stop with a non-stick heat-resistant self-adhesive Teflon fabric 6 (Fig. 6), fixed on the stop by clamping strips 7 located on the sides of the stop and attached to him screws.

The holder 1 is intended for fastening and holding on it a cutting element 8 (Fig.9, 10), made of a solid nichrome thread, mounted on the holder 1 with the possibility of tension. The emphasis and the holder in the top view are L-shaped. The holder 1 is located above the stop 3 in such a way (Fig.6) that during the operation of the thermal knife the cutting element 8 is pressed against the non-stick fabric 6 through a welded film (not shown). Element 8 is connected to electric wires 9 and 10 for supplying current to it. On the holder 1 mounted pads 11 and 12 (figure 10, 12) of a dielectric material, for example, of PCB. In each lining 11 or 12 (FIGS. 2, 6), a socket 13 with a compression spring 14 located therein is made from each end face. Each spring 14 is in a compressed position between the slider 15 and the end face of the socket 13. Each slider 15 is installed at one end thereof in the socket 13, and the other end it is installed in the guides 16, mounted on the holder 1 or made integral with it. On one slider 15, a screw 17 is installed for fastening the cutting element 8 (Figs. 4, 10) to the slider and a positive electric wire 9 for supplying current to the cutting element 8. On the other slider 15 there is a screw 17 for fastening to the cutting slider element 8 (Fig. 8) and negative electric wire 10. The negative electric wire 10 is electrically connected to the cutting element and the metal case of the holder 1 and mounted on it.

The pads 11 and 12 are fixed to the holder 1 by other screws 17 located in the slots of the pads 11 and 12, and these slots are filled with dielectric glue 18 (Fig.3). Between the pads and the cutting element 8 is a non-stick heat-resistant self-adhesive fabric 6 glued to the pads (Fig.6).

The holder 1 is made of a pipe (11), and the mechanism for raising and lowering the thermal knife is mounted in the cavity of the pipe of the holder 1. This mechanism contains a pair of springs 19 interconnected by a rod 20. One spring 19 is connected to a screw 21 of the spring tension screwed into the adjustment a nut 22, abutting with its end against the tube of the holder 23. Another spring 19 is connected to the rod 24, which is connected by a hinge 25 to the earring 26. In the earring, a hole 27 is made in the form of a groove, in which the pin 28 is installed. The upper end of the bent L-shaped rod 29 articulated to the finger 28, the lower end of the rod is fixed to the abutment 3 by means of an arm 30 welded to the abutment 3. For this, a thread is screwed onto the lower end of the rod 29, on which an adjusting nut 31 is fastened to fasten the rod 29 to the bracket 30. The threaded portion of the rod is located in the hole of the bracket 30, nut 31 is located above the bracket 30, and on the threaded part of the rod 29 a nut 32 is screwed on to fasten the rod 29 to the bracket 30, and this nut is located under the bracket.

On the middle part of the rod 29, a shock absorber is installed and fixed, including the upper washer 33, the lower washer 34 and the rubber sleeve 35 located between the washers. The tension force of the mechanism springs 19 is regulated by the nut 22, and the nuts of the mounting hole of the rod and springs are achieved by nuts 31 and 32. It should be noted that the aforementioned shock absorber, in particular a rubber sleeve 35 with said washers (Fig. 11) is located between the holder 1 and the stop 3, and the holder is connected to the stop by a hinge 2, which is located in the L-shaped link circuit between the stop and the holder.

The electrical part of the mechanism for raising and lowering the thermal knife includes an electromagnet 36 (Fig. 1), mounted on an abutment 3, a magnetic cup 37, mounted on a holder 1 above the electromagnet with the possibility of their interaction with each other. The electrical part also contains a magnetic sensor 38 of the position of the holder 1, mounted on the stop (figure 2, 10), and the sensor 38 is electrically connected to the power source and is located with the possibility of interaction with the magnetic plate 39, mounted on the holder 1.

The electromagnet 36 is electrically connected to the heating on and off circuit of the cutting element 8, which is shown in Fig. 14 and contains a transformer 40, a relay 41, an electromagnetic starter 42, a diode bridge 43, a resistor 44, and a magnetic sensor. Circuit 45 includes a nichrome wire, conventionally shown in the diagram at 46, forming the aforementioned cutting element 8. The electrical circuit also shows the electric plug 47 for turning on the power, the mentioned electromagnet (Fig. 1) and the diode 48. All of these circuit elements are connected in such a way, as shown in FIG.

Thermal knife works as follows. An electric plug 47 is connected to the electric network. In this case, the electric circuit is open when the electric plug is turned on. Install products on the working table 4 that are wrapped in a film having sheets to be welded and cut. The holder 1 is rotated by the handle 49 around the hinge 2 from the position shown in Fig. 13 to the working position shown in Fig. 12. The rotation of the holder is carried out by acting on the handle 49 from top to bottom without pressing it at the end of the rotation. At the end of the rotation of the holder, when the magnetic sensor 38 is combined with the magnetic plate 39 (Fig. 2), the relay circuit is closed through the relay 41 (Fig. 14) and the voltage from the transformer 40 is supplied to the electromagnet 36 (Fig. 1) and the thermal knife cutting element 8. In this case, the electromagnet 36 attracts the cup 37, and the cutting element 8 (Fig.6) clamps the welded ends of the film into which the products are packed. Next, the cutting element 8 is heated, heats the ends of the film to be welded and cut, and after a predetermined timer for heating the cutting element 8 and reaching the required temperature to melt the ends of the welded and cut film, the electromagnetic starter 42 (Fig. 14), which breaks the power circuit , demagnetizes the electromagnet 36 (figure 1), and the electromagnetic starter 48 breaks the power circuit and the heating of the cutting element 8 is stopped.

In the process, the thermal knife is triggered by the mechanism of its raising and lowering. When the holder 1 is lifted above the table 4 to the position shown in Fig. 13, the springs 19 are compressed (11), when the holder is lowered, the springs are stretched, while in the horizontal position of the holder 1, when its cup 37 is pulled by the electromagnet 36, the springs 19 are in a stretched position. After demagnetization of the magnet, the knife holder returns to its original position by compressing the springs 19. The mechanism is ensured by the kinematic relationship of the rod 24, the earrings 26 and the L-shaped rod 29, which ensure that the holder 1 rotates around the hinge 2 according to a given movement pattern, while ensuring such the finger 28 moves in the hole 27 of the earring 26, which can be rotated relative to the hinge 25. When the right end of the holder approaches the bracket 30 when it is rotated, it compresses the bottom of the washer 34, which compresses Wrinkles the rubber sleeve 35 and dampens shock loads. Such kinematics of movements of the elements of the mechanism for raising and lowering the thermal knife provides a significant convenience and reduction of the force applied to the handle 49 to move the holder of the thermal knife.

The specified technical result was obtained due to the combination of essential features of the thermal knife, ensuring its reliable operation together with the operation of the thermal knife movement mechanism. A thermal knife virtually eliminates film stickiness and tearing of its edges when cutting. The smoothness of the mechanism allowed minimizing shock loads on the cutting element of the thermal knife, ensured uniform compression of the thermal knife to the stop, increased the reliability of the cutting element of the thermal knife and its service life, which ultimately improved the quality of packaging of products in film and the performance of the packaging machine.

Claims (2)

1. The thermal knife of the packaging machine, characterized in that it comprises a holder pivotally connected to the stop of the thermal knife that is mounted on the table of the packaging machine, a plate made of porous heat-resistant and elastic material is fixed on the stop, while the plate is coated on top and on the sides of the stop with non-stick fabric, the cutting element is fixed on the holder in the form of a stretched continuous nichrome thread, the holder is located above the stop with the possibility of pressing the cutting element to the non-stick fabric through a welded film, The cutting element is connected to the current supply wires for pulse heating of the cutting element, the plus wire is electrically connected to the stop and fixed to it, and the negative wire is electrically connected to the cutting element, pads made of dielectric material, for example, PCB, are fixed in each plate on the side of its end, a nest is made with a slider and a compression spring located in it, which is in a compressed position between the slider and the end of the nest, the slider is installed about it by its end in the socket and the other end is installed in the guide holder is mounted on the slider mounting screw to the slide of the cutting element and negative electrical wire for supplying current to the cutting element. 2. The thermal knife according to claim 1, characterized in that the non-stick fabric is fixed to the stop by clamping strips located on the sides of the stop and screws attached to them, and said linings are fixed to the holder by screws located in the nests of the linings, which are filled with a dielectric cured composition, while the emphasis and the holder in the top view are made rectilinear or they have an L-shaped shape.

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