ES2253980B1 - CHECK CONTROL SYSTEM OF A PACKING MACHINE. - Google Patents

Abstract

This invention consists of a mechanical crank-crank system, which allows a bag or bag to be imprisoned once filled with stored product, to subsequently carry out its hermetic sealing by heat sealing. The system consists of a servomotor (12) controlled by a servodriver (18) that receives the sequence of orders from a programmable automaton (17) and in turn this one from a local control panel (16). The servomotor (12) allows the entire jaw control system to be operated with maximum smoothness and precision of movements, applying the necessary force for each type of bag (15) or bag. By means of the local control panel (16), the order is transmitted to the programmable automaton (17), and this to the servo driver controlling the servomotor (12) that rotates the planetary reducer (4), integral with the crank (3), which in turn produces the opening or closing of the jaws.

Description

Jaw control system of a machine baler.

Object of the invention

This invention relates to a new type of motorized control system for opening and closing the jaws of a packing machine.

Background of the invention

Currently there are different in the market types of automatic packing machines where their systems of control and actuation of the jaws that imprison the bags, They are traditionally pneumatic, hydraulic or cam. This entails a series of drawbacks such as the need to very precise movement synchronization mechanisms at the same time A greater number of moving elements come into play.

These devices are made up of axes, motion reducers, speeds, etc. transmitters of these like chains, belts, etc. in order to transform into many cases circular movements in linear and vice versa.

All these elements produce friction, wear and noise, which result in greater maintenance, energy consumption, need for production times considerable, environmental pollution, which means an increase from the consto of the machine.

In accordance with the above it will be appreciated that there is a need to get a system that exerts pressure necessary to each type of bag or different bag, so close as smoothly as possible, which is achieved with a continuous and progressive acceleration of the invention that outlined below.

Description of the invention

This invention consists of a mechanical system of crank-cranks, which allows you to imprison a bag or bag once filled with the stored product, to make subsequently its heat seal. The system It is composed of the following sets:

Servomotor (12) - Planetary reducer (4)

These two elements are responsible for making turn the Crank (3). The servo motor (12) can vary both the speed and the direction of rotation of the crank. With the use of a planetary reducer (4) is achieved that the system is more reliable and robust, as it is released to the servomotor shaft of much of the friction and vibrations of the system being absorbed by the reducer.

Crank (3) - Front crank (2), rear crank (8)

As mentioned above, the crank performs a rotating movement as it is joined by a clamp to the planetary reducer shaft (4). At the ends of the crank (3) we have the points of union of the two connecting rods (2) and (8), attached to the crank (3) through a bearing cylindrical.

The circular movement of the crank (3) makes Let the cranks turn in solidarity with it. Like the other ends of the connecting rods are connected by means of bearings to the bars mobile (5 and 1), you can apply a force on the bars whose direction is the same as that of the crank shaft and direction opposite.

Bars - Jaws

The force that is applied to the bars by connection "cylindrical bearing" with the connecting rods, is transmitted to the jaws (6 and 7) by joining the mobile bars (5 and 1) to the sliding bars (13 and 14), which at their once they are attached to the anterior (6) and posterior (7) jaws respectively. In this way the force exerted on the movable bars (5 and 1) will be equal to that of the jaws, so it is possible to open or close them depending on the direction of rotation of the crank (3).

The sliding bars (13 and 14) are greased with consistent fat to facilitate movement and avoid friction heating.

Mechanical shock absorber (9)

It is a built-in shock absorber system that controls the pressure exerted by the jaws. The user can adjust the force exerted by the spring using the nuts of stop, top, maximum as a noun, top as an adverb.

The system detects if the jaws exert a Excessive torque through the overload safety sensor (10). This sensor is inductive type and is in contact with the mobile bar (1), so that when closing it separates a few millimeters from it. Yes the force is excessive, the separation will be such that the state of the sensor from ON to OFF detecting the emergency due to overflow.

Description of the drawings

To complete the description of the invention and with in order to facilitate the understanding of its characteristics, it accompanies a series of figures in which illustrative and non-limiting, the following has been represented:

(one)

Mobile bar

(2)

Anterior crank.

(3)

Crank.

(4)

Planetary reducer

(5)

Mobile bar

(6)

Anterior gag.

(7)

Posterior jaw.

(8)

Rear crank

(9)

Mechanical shock absorber

(10)

Safety sensor surpass

(eleven)

Maximum control sensor opening

(12)

Servomotor.

(13)

Sliding bars outside

(14)

Sliding bars interiors

(fifteen)

Bag.

(16)

Local dashboard

(17)

Programmable automata.

(18)

Servodriver

Figure 1 is an elevation view of a packing machine, being the components that affect this invention those described above.

Figure 2 is a plan view of the system of jaw control, object of this invention, in position closed, that is, imprisoning the bags (15).

Figure 3 is a plan view of the system of jaw control, object of this invention, in position open.

Figure 4, is the view of a scheme of system control components, which are the dashboard local (16), the programmable automaton (17), the servodriver (18) and as mechanical element, the planetary reducer (4) and the servomotor (12).

Preferred Embodiment of the Invention

Among the different types of systems jaw control of packaging machines, which can be build based on this invention, the preferred embodiment It is the one described below.

From a traditional packing machine, the jaw control system is redesigned, replacing its drive systems either pneumatic, hydraulic or cam by a system composed of a servomotor (12) controlled by a servodriver (18) that receives the sequence of orders from a programmable automaton (17) and in turn this one of a control panel local (16).

The servomotor (12) with its program of drive, allows to operate the entire control system of jaws with maximum smoothness and precision of movements, applying the force necessary for each type of bag (15) or bag.

When the operator who controls the machine gives the order of operation through the local control panel (16), it transmits the order to the programmable automaton (17) and, depending on its program, to the servo driver controlling the servomotor (12) which turn the planetary reducer (4), integral with the
crank (3).

Depending on the direction of rotation of the motor, the anterior (6) and posterior (7) jaws open or close, allowing to imprison the ends of a bag (15) or bag that subsequently closed by heat sealing.

The system has a series of devices control accessories, among which is the shock absorber mechanical (9) that controls the pressure exerted by the jaws anterior (6) and posterior (7), using a safety sensor over pair (10). This sensor is inductive and is in contact with the mobile bar (1), so that when closing it separates some millimeters of it. If the force is excessive the sensor detects the emergency over par, gives the corresponding signal to the automaton programmable (17) that stops the machine.

The machine also has a maximum sensor opening (11) of the jaws.

Once nature is sufficiently described of this invention, as well as a practical application thereof, only it remains to be added that both its shape and the materials and manufacturing procedure, are subject to modifications, provided that they do not substantially affect the characteristics which are claimed below.

Claims (6)

1. Jaw control system of a packaging machine, characterized in that, the transformation of the rotational movement into linear movement of the jaws, two connecting rods are used, one integral with the bar of the anterior jaw and another connecting rod that moves the rear jaw . 2. Jaw control system of a packaging machine according to claim one characterized in that it has a speed controller and direction of rotation of the crank composed of a servomotor and a planetary reducer. 3. Jaw control system of a packing machine according to previous claims characterized in that it has a jaw closing pressure controller, by means of a mechanical damper with manual adjustment. 4. Jaw control system of a packing machine according to previous claims characterized in that it has an electromechanical overload safety system, controlled by an inductive sensor. 5. Jaw control system of a packaging machine according to previous claims characterized in that it has a maximum opening control of the jaws with respect to their initial positions consisting of an inductive sensor fixed on a guide, and depending on their position in said guide can vary the initial position and determine the maximum opening of the jaws. 6. Jaw control system of a packing machine according to previous claims characterized in that the entire system is controlled by a programmable automaton, which allows linearizing the movement of the jaws with respect to the rotary movement of the crank and simulating a mechanical cam by software with respect to to the rotation of the servomotor.