CS276308B6 - The device axially and simultaneously rotates the screw, especially in injection molding machines - Google Patents

Abstract

The solution concerns a plasticizing and injection unit of injection molding machines, where the molten material is transported into a closed mold by axial movement of the screw while it is rotating. The axial movement of the screw is carried out by an injection cylinder with a piston. The injection cylinder (5) is attached at one end to a cross-section plate (15) and at the rear to a plate (12). The plates (15), (12) are slidably mounted on two guide posts (21). The pins (21) are firmly connected to the brackets (13, (14). The cylinder (5) is provided with internal flanges (18), (19), in which a double-acting hollow piston (3) is slidably mounted. A shaft (2) is mounted in the piston (3) and supported by one end on an axial bearing, while its other end with external involute splining (6) is mounted in a coupling (7) with internal involute splining (8). The other end of the coupling (7) is connected to the output shaft (9) of the hydraulic motor (10). The hydraulic motor (10) itself is mounted on the rear face of the cylinder (5).

Description

1 EN 276 308 86

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a plasticizing and injection molding unit, wherein the molten mass is conveyed to the closed mold by axial movement of the screw while rotating it.

A number of embodiments of plasticizing and injection units are known with certain advantages and disadvantages. For example, in lower-weight injection molding machines, there is an embodiment where the axial movement of the screw is driven by the piston of the hydraulic cylinder and a hydraulic motor guided by a rod is used before the coil is rotated simultaneously. The disadvantage of this device is that large masses need to be moved over the stems by the priaxial movement of the screw. The whole device is highly demanding in terms of precision, and inaccuracies in operation often occur when the machine is mounted.

These drawbacks are eliminated by the device for axially and simultaneously rotating movement of the screw according to the invention, in particular for injection molding machines, where the axial movement of the screw is provided by an injection cylinder designed as a support for the entire device, with a double-acting piston in which the shaft is supported and axially supported by a shaft at one end rigidly coupled to the threaded end and provided at the other end with an external involute groove serving to transfer Mk from the hydraulic motor fixedly mounted in the injection cylinder by means of an internal involute groove coupling in which it is simultaneously displaced axially. An advantage of the device according to the invention is that it is more compact than known devices, whereby high accuracy can be achieved in its manufacture. Furthermore, by firmly incorporating the hydrotube in the injection cylinder, the screw does not overcome any traction during the axial movement and large masses are not displaced. An exemplary embodiment of the device according to the invention is shown in Fig. 1 of the accompanying drawing.

The axial movement of the screw 2 is carried out by an injection cylinder 5 which is fixed at one end by a split ring 16 and a flange 20 to the front plate 15 and in the rear part also by a split ring 16 and a flange 20 to the back plate 12.

The plates 15, 12 are slidably mounted on two guide pins 21, which are fixed in the brackets 13, 14. The cylinder 5 is provided with internal flanges 18, 19. the shaft is supported axially on the shaft 4 and is supported by the shaft 2 at one end, which is fixedly connected to the screw by this end. The other end of the shaft 2 is provided with an external involute groove 6 and is slidably mounted in the coupling 2 by an internal involute groove 8. The second end is connected to the output shaft 9 of the hydraulic motor 10 and to the slide from the shaft 2 is secured by a flange 11. The hydraulic motor 10 itself is mounted on the rear face of the cylinder 5.

The device according to the invention operates as follows:

The rotation of the screw 1 performs the hydraulic motor 10 through the coupling 7. The torque is transmitted through the coupling 7 with the internal involute groove 8 to the shaft 2 with the external involute grooving 6, the shaft 2 being fixedly connected to the screw 1 by the second end and supported on the bearing 4_. .

The axial bearing 6 is mounted in a double-acting piston cylinder 3 · The axial movement of the screw 11 in the coupling 2 is guided by the injection cylinder 2- Turning the double-acting piston 3 when the screw is rotated 1branched axially bearing 4. Slipping of the coupling 2 2shaft 9 hydraulic motor 10 prevents flange 11 .

Claims (1)

PATENT CLAIMS Device for axial and simultaneous rotational movement of a screw, especially in injection molding machines where the axial movement of the screw is performed, by an injection cylinder with a piston, characterized in that the cylinder (5) is attached at one end to the front damping (15) and at the rear to plates (12) which are slidably mounted on two guide posts (21) fixedly connected to the brackets (13), (14), the cylinder (5) being provided with inner flanges (18), (19) in which it is slidably mounted double-acting hollow piston (3), in which a shaft (2) is supported by an axial bearing (4) at one end, its other end being connected by a coupling (7) to the output shaft (9) and the hydraulic motor (10) itself is mounted on the rear face of the cylinder (5).