WO2019207482A1

WO2019207482A1 - Lateral support for mounting a cylinder in an injection-moulding system

Info

Publication number: WO2019207482A1
Application number: PCT/IB2019/053345
Authority: WO
Inventors: Francisco Jose VESTIA MILHINHOS
Original assignee: Yudo Eu, S.A.
Priority date: 2018-04-23
Filing date: 2019-04-23
Publication date: 2019-10-31

Abstract

The present application describes a support for fastening a hydraulic or pneumatic cylinder (8) to the side of a carburetor in an injection-moulding system. The support comprises a movable base (1) that operates on the basis of a lever system (2), actuating the movement of the valve needle. The advantages associated with this approach are a reduction in the thickness of the plate for securing the mould to the injection-moulding machine, in comparison with the conventional system in which the cylinder (8) is mounted on the carburetor. Furthermore, this configuration makes it possible to optimise the overall size of the machine, dispensing with the normal refrigeration circuits used to cool the cylinder.

Description

DESCRIPTION

"SIDE CYLINDER MOUNTING BRACKET IN A

INJECTION"

Technical Domain

The present application describes a cylinder mounting side bracket in an injection system.

Background

EP 2385893 B1 describes a system for injecting a thermoplastic material in the fluid state. Said system comprises an injection nozzle defining at least a portion of a transit passageway, a shutter mounted within the transit passageway for sliding between a closed position and an open position thereof and control means for alternately slide the shutter. Said system is characterized in that the control means comprises a jack-like mechanism whose rods are parallel to the sliding direction of the shutter. A lever arranged to rotate about an axis to drive the sealing movements of the cylinder rod. The disadvantage of this solution is that said lever is implemented using two sidebars, causing misalignment due to lack of rigidity of its base, increasing the clearance of the mechanism and the possibility of it gripping with movement, as it is not have rollers between the shafts and the control means, resulting in loss of precision.

CN 106514966 A discloses a valve needle extension and retraction device comprising a hot runner manifold and a pressure cylinder. The part bottom of the hot runner manifold is connected with a spray nozzle. A valve needle is disposed in the spray nozzle. The top of the hot runner manifold is fixedly connected with a bracket that extends to one side of the hot runner manifold. A lever is disposed on the upper side of the bracket and rotationally connected with the bracket. The pressure cylinder is arranged below the bracket and securely connected to the bracket. A piston rod and thrust cylinder valve needle extend into position above the bracket. The first end of the lever is connected to the piston rod and the second end of the lever is connected to the valve needle. With this configuration, the pressure cylinder is installed in the bracket and located on one side of the hot runner manifold. The disadvantage of this approach is that it relies on a loosely rigid base, allowing for frame-wide flexing that will increase wear on the valve needle guiding, leading to loss of device accuracy. As a consequence, the device will need further maintenance.

CN 104552808 A discloses an injection molding system where the cylinder is disposed on the side of the carburetor. To this end, a cylinder piston rod is connected to the inner side end of a valve needle by virtue of a lever member. The central part of the lever member is subjected to a hinged support, one end being hinged to the cylinder and the other to the inner side end of the valve needle. The disadvantage of this solution is associated with the lack of rigidity of the base, which leads to loss of precision of valve closure. In addition, the fact that The use of dowels that work directly without any intermediate bush increases premature wear.

summary

The present application describes a cylinder mounting side support in an injection system comprising a solid base; said solid base being characterized by:

- cylinder and carburettor fasteners, said fasteners arranged on the same face of the solid base along its longitudinal axis, the cylinder arranged on the side of the carburetor;

- a lever installed therein along the longitudinal axis having rotational movement about a pin;

Said lever comprising a roller at each end thereof, said rollers provided with rotational movement;

- two vertical sliding channels arranged at both ends of the solid base and along its transverse axis;

- two sliding blocks, connected to each end of the roller lever assembly, each inserted into the vertical sliding channels;

Where, the sliding block that connects to the end of the lever that belongs to the solid base side that contacts the cylinder comprises a cylinder connection fitting. In a particular embodiment of the side support, the solid base fasteners to the cylinder and carburetor are of the washer type.

In a particular embodiment of the side support, the washers securing the solid base to the carburetor are higher than the washers securing the cylinder.

In yet another particular embodiment of the side support, the rollers are secured to the lever structure by bolts.

Finally, in another particular embodiment of the side support, the vertical sliding channels comprise solid lubricated sliding bars.

General description

The present application describes a lateral support specially adapted to provide for mounting a cylinder, whether hydraulic or pneumatic, in an injection system. Using this device the cylinder is mounted on the side of the carburetor, driving the movement of the valve needle.

The advantages associated with this approach relate to the reduction in thickness used in the mold clamping plate to the injection machine compared to a conventional system where the cylinder is installed on top of the carburetor. In addition, this configuration allows the overall size of the machinery to be optimized without the need for normal cooling circuits used for cylinder cooling. The developed side support is comprised of a solid fixing base that connects to the cylinder and the carburetor, disposing them side by side. The coupling of the solid base to each of the two elements is provided by means of bolt and washer clamping mechanisms, with the washers for connecting the base to the carburetor higher than the mounting washers to the cylinder. This configuration reduces heat transfer from the carburetor to the solid base of the support, extending the life of the support components and thereby reducing maintenance needs.

Within the solid base is a lever using a pin having a rotational movement about said pin circumscribed within the base. As the term solid, it is meant that the base has high rigidity, which in practice means that it is adapted to withstand forces three times greater than that exerted therein. The lever consists of two rollers, one at each of its ends, which are connected to its structure by a pin, causing said rollers to have a rotational movement. The solid base comprises at its side ends two vertical sliding channels accommodating both ends of the lever and where the respective rollers are inserted, restricting the rotational movement of the lever to an upper and lower limit. To confine the lever-roller assembly to said sliding channels, blocks are used which move in solidarity with the assembly. In this way the two sliding blocks can be moved in the vertical channels without influence of lateral forces, which in this configuration are eliminated by the fact that the rollers rotate around a lever connecting bolt, which in turn rotates in the same plane as the roller rotation plane, but in the opposite direction, operating as a roller system. This makes the lever, regardless of its position, always perform the same force on the plane as the rollers slide. This reduces friction and consequently wear of parts by eliminating lateral forces.

The sliding blocks are of different configurations, since the solid base side block which makes contact with the cylinder is provided with a connection socket to said cylinder, allowing to act as a valve needle, and its drive is articulated with the movement of the lever-roller assembly. Vertical sliding channels are provided with solid lubricated sliding bars to reduce maintenance and guide them vertically. In fact, this construction prevents the valve needle from creating premature wear on the guide bushing and sealing it by preventing side forces due to the sliding block connecting the cylinder having a guide within the bars of about twice the course in any position.

Brief Description of the Figures

For an easier understanding of the present application, attached are figures which represent preferred embodiments which, however, are not intended to limit the art disclosed herein. Figure 1 illustrates a top view of an embodiment of the developed side support, wherein reference numerals represent:

1 - solid base;

2 - lever;

3 - peg;

4 - washers;

5 - sliding block of contact with the cylinder;

Figure 2 shows a cross-sectional view of the developed side support, where the reference numerals represent:

1 - solid base;

2 - lever;

3 - peg;

5 - sliding block of contact with the cylinder;

6 - sliding block of contact with the carburetor;

7 - roller;

8 - cylinder.

Figure 3 illustrates an exploded view of the developed side support, where reference numerals represent:

1 - solid base;

2 - lever;

3 - peg;

4 - washers;

5 - sliding block of contact with the cylinder;

6 - sliding block of contact with the carburetor;

7 - roller;

8 - cylinder. Description of Embodiments

Referring to the figures, some embodiments are now described in more detail, which are not, however, intended to limit the scope of the present application.

In a particular embodiment, the developed side support is comprised of a solid base (1). Said base (1) has a parallelepiped shape, comprising on one of its faces fastening elements, used for lateral mounting of a cylinder (8) and a carburetor. The fasteners are of the washer type (4). In a particular embodiment, the carburettor washers (4) are of a higher height than the cylinder (8) retaining washers (4). The cylinder (8) may be of hydraulic or pneumatic type. A lever (2) is installed within the solid base (1) along its longitudinal axis, having a rotational movement around a pin (3). The lever (2) comprises a roller (7) at each end thereof provided with rotational movement. The connection between the lever (2) and the roller (7) is made through a pin. The solid base (1) comprises two vertical sliding channels arranged at both ends along its transverse axis. In both vertical sliding channels, sliding blocks are inserted, connected to each end of the lever (2) - roller (7) assembly. The cylinder contact sliding block (5) comprises a cylinder connecting socket (8). In a particular embodiment, the vertical sliding channels comprise solid lubricated sliding bars. The present description is, of course, by no means restricted to the embodiments set forth herein and a person of ordinary skill in the art may foresee many possibilities for modification thereof without departing from the general idea as defined in the claims. The preferred embodiments described above are obviously combinable with each other. The following claims further define preferred embodiments.

Claims

REINDICATIONS

1. Cylinder mounting side bracket in an injection system comprising a solid base; said solid base comprising:

Where, the sliding block that connects to the end of the lever that belongs to the solid base side that contacts the cylinder comprises a cylinder connection fitting.

Lateral support according to claim 1, wherein the solid base fasteners to the cylinder and carburetor are of the washer type.

Lateral support according to claim 2, wherein the washers securing the solid base to the carburetor are higher than the washers securing to the cylinder.

Lateral support according to any one of the preceding claims, wherein the rollers are secured to the lever structure by bolts.

Lateral support according to any one of the preceding claims, wherein the vertical sliding channels comprise solid lubricated sliding bars.