RU13552U1 - SEALING MECHANISM FOR PREFERREDLY RECTANGULAR POLYMER COATED PAPER BAGS FOR LIQUID FOOD PRODUCTS - Google Patents

Abstract

1. The mechanism of hermetic sealing of predominantly rectangular cardboard bags with a polymer coating for liquid food products, including a housing, clamping jaws, mounted with the possibility of closure, and a pneumatic actuator, characterized in that it further comprises a bar with internal bevels for preliminary compression of the upper valves of the package, this strap is connected to the tip of the rod of the pneumatic cylinder by means of rods with spring-loaded thrust bushings fixed to them, and the crossbars, jaws are mounted on chagas, which are connected by means of earrings to an axis located in the groove of the tip of the rod of the pneumatic cylinder, and a cam is fixed on one of the jaws to interact with the bar to raise it and withdraw it from the jaw closure zone. 2. The mechanism according to claim 1, characterized in that the stops are mounted on the crossbar, which serve to adjust the angle of the earrings and, therefore, the compression force of the jaws. A mechanism according to any one of claims 1 and 2, characterized in that the jaws have channels for water cooling. The mechanism according to any one of claims 1 to 3, characterized in that the clamping jaws are made up of two plates mounted with the possibility of changing the gap between them.

Description

The mechanism of hermetic sealing of predominantly rectangular cardboard bags with a polymer coating for

liquid foods

The invention relates to devices for sealing the upper flaps of rectangular bags of nz cardboard coated with a polymer material and intended for liquid food products, mainly for milk, lactic acid products, as well as for various juices and drinks.

A device is known for connecting and tightly sealing the layers of a cardboard packaging coated with a thermoplastic sealing material (1,2).

Closest to the claimed is a hermetic sealing mechanism, comprising a housing, clamping jaws, mounted with the possibility of closing, and a pneumatic actuator (2).

In the known device, the sealing is carried out using sponges, one of which is connected to the pneumatic drive, and the other is stationary. To close the jaws, a cylinder with a large stroke is required, which requires high precision in its manufacture, and, consequently, significant production costs. In addition, the compression force of the jaws is determined only by the diameter of the cylinder and it is difficult to regulate it in such c.iiy4ae, and to obtain significant efforts necessary to ensure a high-quality weld, a significant diameter is required, respectively

2000102581

,,: I Illlll TIPS Illll I, 02 5 S 1,

MPK6V65V43 / 26

pneumatic cylinder at a given pressure of compressed air in the consumer network.

Since the forming and heating of the upper valves of the bag is carried out at the previous positions during the movement of the bag, it can be displaced with respect to the elements of the sealing mechanism, which leads to poor sealing.

The claimed utility model is aimed at solving the problem, is to simplify the design of the sealing mechanism, increase its reliability in operation, and also improve the quality of sealing by providing the necessary compression forces of the jaws and facilitating the adjustment of its size.

This problem is solved in that the hermetic sealing mechanism, mainly rectangular cardboard packagings with a polymer coating for liquid food products, including a housing, clamping jaws, mounted with the possibility of closing, and a pneumatic actuator, additionally contains a bar with internal bevels for preliminary compression of the upper valves of the package, this strap is connected to the tip of the rod of the pneumatic cylinder by means of clamps with spring-loaded thrust bushings fixed to them, and the crossbars, jaws are mounted on and levers, which are connected by means of earrings to an axis located in the groove of the tip of the flap of the pneumatic cylinder, and a cam is fixed on one of the jaws

interaction with the bar to raise it and withdraw from the jaw closure zone.

In addition, stops were mounted on the crossbar, which serve to regulate the angle of the earrings, and therefore the compression force of the jaws.

The sponges can have channels for water cooling, and can also be made composite of two plates mounted with the possibility of changing the gap between them.

An information search carried out by the applicant in order to establish the state of the art did not reveal known technical solutions of the same purpose and possessing the same characteristics as the claimed mechanism, namely, the prior art is unknown with the proposed articulated four-link (lever lever) kinematic

chain, which allows us to conclude that the novelty of the set of features,

characterizing the claimed technical solution, and regarding the mentioned solution as a whole, make a conclusion about its compliance with the eligibility criterion “novelty.

Figure 1 schematically shows a tight sealing mechanism, side view; on - a section along aa in figure 1; in Fig. 3, the shaping of the upper valves of the package; figure 4 - position of the package at the time of sealing.

The mechanism comprises a housing, including two cheeks 1, connected by four cylindrical struts 2 and a clamp 3, by which the mechanism is mounted on the rack 4. The drive of the mechanism is

SUQM- €) Ol, l

a pneumatic cylinder 5, in the tip 6 of which a groove is made 7. Bearings are mounted in the cheeks 1, in which two levers 9 are suspended on the axles 8 with clamping lips 10 fixed on them. The levers 9 are connected by means of earrings 11 to the axis 12 located in the groove of the tip of the pneumatic cylinder rod 6 . For preliminary compression (shaping) of the upper valves of the package, a plate 13 with internal bevels C is used, which is connected to the tip 6 of the rod of the pneumatic cylinder 5 by means of rods 14 with spring-loaded thrust bushings 15 and the bar 16. The cam 17 is fixed on one of the jaws for interaction with a strap 13 for raising and withdrawing it from the jaw closure zone 10.

To regulate the angle of inclination of the earrings 11 and, thus, to regulate the compression force of the jaws 10, the stops 18 mounted on the crossbar 16 are used.

In the jaws 10 can be made of water cooling channels (not shown). In addition, the jaws 10 can be made integral of two plates, between which spacers 19 are located, which serve to regulate the gap between the plates.

To fix the bag at the time of printing, on stand 4

The spring-loaded stop 20 and the guide 21 are fixed. Between the hubs 15 and the strap 16 mounted springs 22. The mechanism operates as follows.

After fastening the bag with the liquid food product and preforming and heating its upper valves (the preforming and heating units are at the previous positions), the bag goes to the sealing position. A signal is sent to operate the pneumatic cylinder 5, the rod of which begins to move down.

Folding the upper valves of the bag for sealing occurs in two stages in two perpendicular directions.

When the piston rod of the pneumatic cylinder 5 moves downward, its tip 6 slides within its groove 7 along the axis 12 of the earrings 11 without transmitting force to them. In this case, the crossbar 16, connected with the tip 6 of the flap of the pneumatic cylinder 5 by the arms 14, the forces to which are transmitted through

spring 22, the bar 13 also moves downward, which, with its internal bevels C (FIGS. 2, 3), carries out preliminary compression of the upper valves of the package (first stage),

With the emphasis of the sleeve 15 in the body of the mechanism, the bar 13 stops, and the rod of the pneumatic cylinder 5 continues to move down. Until the upper edge of the groove 7 of the tip of the flap of the pneumatic cylinder 5 reaches the axis 12 of the earrings 11, the levers 9 with jaws are held in the unfolded state under the action of springs (not shown in the drawing) fixed on the axes 8.

After the interaction of the upper edge of the groove 7 with the axis 12, the onward movement of the jaws 10 to the valves of the bag begins - the second stage of folding the valves and compressing them until sealed with

LV (

the formation of a "scallop. In this case, the cam 17, mounted on one of the jaws, moving along the radius, interacts with the bar 13, pushing it up and allowing the jaws to close with a given force for a period of time necessary for the final hardening of the thermoplastic material and the formation of a hermetic joint.

Thus, the proposed mechanism due to the preliminary folding of the upper valves of the package, carried out in two perpendicular directions (a bar with internal bevels and clamping jaws) provides a tight joint of high quality. The presence of a kinematic chain in the design of the articulated four-link (levers-earrings) makes it possible to obtain complex movement without the use of special devices providing constant links of the links, and also provides the convenience and efficiency of adjusting the magnitude of the compression force of the pressing jaws. The possibility of using a cylinder with a small stroke in the design allows to reduce the cost of manufacturing the mechanism as a whole.

Sources of information:

1.SU 1012794A, 04/15/1983

2.RU2120894C1, 10.27.1998

Claims (4)

1. The mechanism of hermetic sealing of predominantly rectangular cardboard bags with a polymer coating for liquid food products, including a housing, clamping jaws, mounted with the possibility of closure, and a pneumatic actuator, characterized in that it further comprises a bar with internal bevels for preliminary compression of the upper valves of the package, this strap is connected to the tip of the rod of the pneumatic cylinder by means of rods with spring-loaded thrust bushings fixed to them, and the crossbars, jaws are mounted on chaga, which are connected by means of earrings to an axis located in the groove of the tip of the rod of the pneumatic cylinder, and a cam is fixed on one of the jaws to interact with the bar to raise it and remove it from the jaw closure zone.  2. The mechanism according to claim 1, characterized in that the stops are mounted on the crossbar, which serve to adjust the angle of the earrings and, consequently, the compression force of the jaws.  3. The mechanism according to any one of claims 1 and 2, characterized in that the jaws have channels for water cooling. 4. The mechanism according to any one of claims 1 to 3, characterized in that the clamping jaws are made up of two plates mounted with the possibility of changing the gap between them.