BG3277U1 - Locking mechanism for forming die - Google Patents

Abstract

The locking mechanism comprises a carrier(5) mounted fixedly, externally and longitudinally to the first half-shell (1) and of a plate (6) located opposite , on the second half-shell (2) with laterally shaped safety holes therein. Movable locks (7) are mounted to the carrier (5), fixed axially and movably to the carrier (5). The movable locks (7) are L-shaped, so that a gripping profile is formed at the front end of each of them. Each of the movable locks (7) is attached axially and movably to a control arm (9), which is installed parallel to the carrier (5) and performs reciprocating movement along the vertical of the forming die. A bearing (11) is mounted to the control arm (9), at its lower end, controlled by a spatial cam (12) with ascent and descent areas "C" formed therein. The control arm (9) is movably mounted in a fixing element (13) fixed to the first half-shell (1). One of the ends of a bearing spring (15) is attached to the control arm (9) by means of a bracket (14), which is attached to the carrier (5) at its other end.

Description

Field of application

The utility model refers to a locking mechanism for a molding matrix, which will find application in particular in rotary inflating machines for the production of containers (bottles) made of thermoplastic materials.

BACKGROUND OF THE INVENTION

In rotary inflating machines, a plurality of molding dies are arranged radially around a central axis of rotation, and the means for opening and closing the parts of each die are synchronized with the movement of other devices that interact in the operation of the rotary inflating machine.

In general, a molding matrix for the production of bottles of thermoplastic materials consists of three main parts - left and right half-shells and bottom. The left and right half-shells are symmetrical and hinged together, so that they can rotate around their hinge to a certain angle. In the closed position, the three parts of the molding die form a hollow, closed body, the shape of the cavity determining the shape of the produced bottle.

During the formation of the workpiece, the pressure of the fluid, usually air, inside the workpiece increases and thus inside the die, an opening force is exerted on its components, which can lead to the production of a poor quality bottle is clearly visible line of separation between its left and right parts at the junction of the two half-shells.

A locking mechanism for a molding die for the production of bottles of polymeric material is known, consisting of three main parts - left and right half-shells and a bottom. The left and right half-shells are symmetrical and mounted on a common axis so that they can rotate around their common axis to a certain angle, and the bottom is mounted so as to reciprocate vertically (EP 2 942 179).

Externally, longitudinally, vertically and parallel to their common hinge axis to the two half-shells are mounted support interchangeable profiles. Each of the two interchangeable support profiles is made of an external vertical rib. A rotating closing element (movable lock) with a C-shaped profile facing the support profiles is hinged on one of the two half-shells. The C-shaped profile of the movable lock grips and maintains in a closed position the two half-shells of the die during the process of forming the bottles.

In the lower part of the closing element a drive bearing is mounted, a cam profile interacts, and with the help of the drive bearing the closing element is moved between the two end positions of the locking mechanism - open and closed. A spring installed and mounted to the closing element and one half-shell is also used to support the process.

In this design, when the spring fails, the action of the entire locking mechanism is blocked and production stops until the problem is eliminated.

The use of one closing element along the entire length complicates the construction and slows down its speed of operation and productivity.

Technical essence of the utility model

The task of the utility model is to create a locking mechanism for the molding matrix is increased reliability in operation and lightweight construction.

This problem is solved by creating a locking mechanism for the molding matrix, in particular a mold for a rotary inflating machine, consisting of a movable lock, a bearing controlled by a spatial cam and a spring, a movable lock and the first half-shell of the molding matrix.

The mechanism also includes a support mounted fixedly, externally and longitudinally to one half-shell and located parallel to it, fixedly on the second half-shell, plate. Profiled safety openings are formed laterally in the plate.

6346 Descriptions to certificates for registration of utility models № 11.1 / 15.11.2019

A number of L-shaped movable locks with a gripping profile formed at their front end are mounted one above the other on the carrier. The movable locks are mounted axially movably at their rear end to the carrier and at their central part to the control arm. The control arm is mounted parallel to the carrier, with the possibility of reciprocating movement along the vertical of the molding die.

A bearing controlled by a spatial cam is mounted at the lower end of the control arm. The control arm is further movably mounted in a locking element mounted fixedly to the first (left) half-shell.

One end of a bearing spring is clamped to the control arm by means of a clamp, which at its other end is attached to the carrier.

The main advantages of the utility model are the following:

- in the present utility model, the locking movable locks rotate in the vertical direction and so even if there is a broken spring, the mechanism can be closed due to the weight of the arm;

- in the proposed mechanism, the locking takes into account the load of the whole mechanism, ie. different number of removable locks can be placed and with different position (the upper ones should be closer to each other due to the higher load in the upper side of the node);

- the locking mechanism is lighter, which makes it faster due to its smaller mass;

- with this mechanism there are many locking points (multi-point locking) located in several places and even if one of the movable locks fails, the effort can be absorbed by the others (in emergency situations).

Explanation of the attached figures

Figure 1 shows in axonometry an open molding die;

Figure 2 is a top view of an open molding die;

Figure 3 is a perspective view of an open molding die with a locking mechanism;

Figure 4 is a front view of a locked molding die;

Figure 5 is a plan view of a closed molding die;

Figure 6 - removable lock in the closed position.

Exemplary implementation of the utility model

In general, a molding matrix for the production of bottles of thermoplastic material consists of three main parts - first (in the drawings left) 1 and second (right) 2 half-shells and bottom 3. The two half-shells 1 and 2 are symmetrical and are mounted on a common longitudinal axis 4, so that they can perform a reciprocating rotation around their common axis 4 to a certain angle - fig. 1 and FIG. 2.

A variant solution is also possible, in which one half-shell is stationary and the other movable.

The bottom 3 can reciprocate only vertically between the two half-shells 1 and 2.

In the closed position, the three parts of the molding die form a hollow, closed body, the shape of the formed cavity determining the shape of the produced bottle or container.

The locking mechanism (Fig. 3) consists of a support 5 mounted fixedly, externally and longitudinally to one half-shell - in this case the first (left) 1 and from located opposite to it, fixedly on the second half-shell 2 (right) plate 6 with profiled lateral in its safety openings - the areas indicated by "A".

The carrier 5 and the plate 6 are arranged parallel to the axis 4 of the molding die.

A plurality of movable locks 7 are mounted to the carrier 5, which in their rear parts are axially movably attached to the carrier 5 by means of axles 8.

The movable locks 7 are L-shaped, so that at the front end of each of the movable locks 7 is formed a gripping profile - zone "B".

Each of the movable locks 7 is axially movably attached in its central part to the control arm 9 by means of connecting axles 10. The control arm 9 is mounted parallel to the carrier and the plate 6 and reciprocates the vertical of the molding die.

6347 Descriptions to certificates for registration of utility models № 11.1 / 15.11.2019

To the control arm 9, at its lower end, a bearing 11 is mounted, which bearing 11 is controlled by a spatial cam 12. The ascent and descent zones "C" are formed to the spatial cam 12.

In this case, the control arm 9 is movably mounted in a fixing element 13 fixed to the left half-shell 1. The fixing element 13 does not allow deviations of the control arm 9 in a direction perpendicular to its reciprocating movement.

In one embodiment, it is possible to mount a pneumatic or electric drive to control the control arm 9 instead of using the space cam 12 and the bearing 11.

One end of a bearing spring 15 is attached to the control arm 9 by means of a bracket 14, which at its other end is attached to the carrier 5.

Laterally in the plate 6 are formed the security holes - profiles "A", which are counter profiles of the profiles "B" of the movable locks 7.

Operating principle

After the workpiece enters the mold for forming vessels and after its closing, it is necessary to ensure reliable fixing of its parts in this position.

The sequence of work is as follows:

- After closing the molding die, the locking mechanism fixes the two movable half-shells 1 and 2 - fig. 4 and FIG. 5, for this purpose the movable locks 7, which in the presented exemplary embodiment are three pieces arranged vertically one above the other, are led to the fixed plate 6.

- The control of the movable locks 7 is performed by means of the control arm 9, to which the bearing 11 is attached, the position of which is controlled by the spatial cam 12 or by a pneumatic or electric device for controlling the arm 9, as an alternative embodiment.

- In the spatial cam 12 there are zones for ascent and descent "C", which zones provide the necessary stroke for driving in the vertical axial direction of the movable control arm 9.

- The control arm 9 drives the movable locks 7, which rotate about the axes 8 and 10, so as to ensure positioning and fixing of the movable locks 7 in the profiles "A" made in the plate 6.

- The movement of the bearing 11 on the cam 12 is time-coordinated with respect to the molding cycle of the cylinders and is also positionally provided with respect to the plate 6. The guaranteed contact between the bearing 11 and the space cam 12 is provided by the tension spring 15 and aims to always leave the control arm 9 to the spatial cam 12 in a vertical "down" direction.

- In FIG. 6 presents the correct positioning of the locking mechanism - zones "A" and "B" oriented relative to each other.

- In the stage of unlocking the mechanism the principle is the same - in the spatial hump 12 is made a slope (zone "C"), which raises the bearing 11, and it in turn drives the control arm 9. Then turn the movable locks 7 in the unlocking position .

6348 Descriptions to certificates for registration of utility models № 11.1 / 15.11.2019

Claims (1)

Claims A locking mechanism for a molding die, in particular for a rotary inflating machine, consisting of a movable lock, a bearing controlled by a spatial cam and a spring connected to the movable lock and the first half-shell of the molding die, characterized in that the locking mechanism also includes a support (5) mounted fixedly, externally and longitudinally to the first half-shell (1) and from a plate (6) located parallel to it, fixedly on the second half-shell (2) with profiled side openings in it, as to the carrier ) are mounted one above the other a plurality of L-shaped movable locks (7) with a gripping profile formed at their front end, whereby the locks (7) are installed at their rear end axially and movably to the carrier (5), and in the central its parts to a control arm (9), which is installed parallel to the carrier (5), with the possibility of reciprocating movement along the vertical of the molding matrix, whereby to the lower end of the control since the arm (9) is mounted a bearing (11) controlled by a spatial cam (12), the control arm (9) being movably mounted in a fixing element (13) fixed to the first half-shell (1), whereby to the control arm (9) one end of a bearing spring (15) is clamped, which at its other end is clamped to the carrier (5).