SU1722854A1 - Rotary casting machine to mould thermosoftening plastics - Google Patents

Abstract

Purpose: processing of polymeric materials on rotary injection molding machines with the expansion of technological capabilities. SUMMARY OF THE INVENTION: The rotary machine is equipped with driving pivot arms, each of which is made with a power roller for locking and a wedge section and is mounted to be in contact with a shock absorber in the locking zone, and each slide is made with a conical surface on the end face for engagement with the wedge section of the lever. 4 il.

Description

The invention relates to equipment for the processing of polymeric materials, in particular to rotary injection molding machines for mechanically driven thermoplastics for closing, opening and locking molds.

A known rotary injection molding machine comprising a stationary kneader and a process rotor with molds for injection, cooling and mold separation.

A disadvantage of the known invention is the relatively high energy consumption and its complexity due to the use of a hydraulic drive for closing the -detacking and locking the molds (which, as is well known, has a relatively low energy efficiency due to large resistance losses and includes complex equipment: pumping station with low and high pressure pumps, hydraulic distributor, hydraulic cylinders, etc.).

Closest to the proposed is a rotary injection molding machine for thermoplastics, containing a stationary

plasticizer, technological rotor with injection mechanisms, molds with dies installed in the rotor disk, and punches associated with drive sliders for closing and unlocking the molds, ring copier with a locking zone, a shock absorber.

However, the known machine is limited by the possibility of obtaining large technological efforts during locking and holding under the working force of the molds, since large contact voltages arise between the power roller of the sliders and the copier, which allow technological forces on the slide no more than 800-1000 kg.

The purpose of the invention is to expand the technological capabilities of the machine by increasing the efforts to lock and hold the molds.

The goal is achieved by the fact that a known rotary injection molding machine for thermoplastics, comprising a stationary kneader, a technological rotor with injection mechanisms, molds with dies installed in the rotor disk, and

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punches associated with actuating sliders for closing and unlocking molds, a circular copier with a locking zone, a shock absorber is equipped with driven rotary levers, each made with a force roller for locking and a wedge section and installed with the possibility of contacting the shock absorber in the locking zone, and each slider is made with a conical surface at the end for interacting with the wedge section of the lever.

FIG. 1 shows the proposed machine, a longitudinal section; in fig. 2 shows section A-A in FIG. one; in fig. 3 shows the node I in FIG. one; in fig. 4 shows a section BB in FIG. 3

The machine contains a permanently installed plasticator 1, a technological rotor 2, a means for closing the -diffusing and locking the molds; small hydraulic injection and rotational drive of the rotor (not shown).

The technological rotor has a gear 3, a drum 4, a support disk 5, two disks 6 and 7 for attaching the molds.

8 and locations of open channels

9 and 10 of the cooling system, a set of power tg 11 for closing the technological forces in the rotor, the lower disk 12 with the heating system 13 and the mechanisms for injecting the means for closing and opening and locking the molds 8.

The injection mechanisms installed at each position include an injection cylinder 14c with a plunger connected by channels 15 and 16c with a plasticizer 1 and a nozzle 17 controlled by a lever 18 from a stationary ring copier 19. The plunger of the injection cylinder 14 is controlled by a plunger 20 of a hydraulic cylinder connected through a valve 21 with a small hydraulic drive, including one low flow pump (not shown) and a return spring 22.

The means for closing the -braking and locking the molds is made (Fig. 1.3, 4) in the form of a driving slider 23 with a conical surface 24 at the end and a lever 26 rotatable on the axis 25 with a wedge section 27 and a power roller 28 mounted on each the positions of the rotor, as well as the ring fixed copier 29 (Fig. 2) with an area of 30 and 31 for locking and unlocking molds. When this slider 23 is located coaxially with the mold 8 with the ability to interact with its punch 32, the lever 26 is installed between the slider 23 and the rotor support disk 5 with the ability to interact with the wedge section 27 with the conical surface 24 of the slider, and the power roller 28 - with a copier 29 which in zone 30 of locking is provided with a shock absorber 33 (spring or hydraulic depending on the closing force of the molds). The machine works as follows.

When starting the drive, the rotor gets a uniform rotation, plasticator 1 feeds the material melt into injection mechanisms, slides 23 for each revolution

the rotor, interacting with the cam 34, make one reciprocating movement to open and close the molds 8, and the water supplied from the nozzle 35 to the open channels 9

The disk 6 gradually passes through the channels between the punches 32 of the molds, flows through the tube 36 into the lower disk 7, passes through the channels between the dies 37 of the molds and is removed to the annular collector 38.

In zone a (Fig. 2), the slider 23 makes a move downward, close the mold.

In zone a, the mold is locked by inserting a wedge section 27 of the pivoting lever 26 under the conical surface 24 of the slider 23, which interacts with its power roller 28 with a cam 29, and at the end of the stroke with the shock absorber roller 33, which is set to the necessary force to lock the mold .

In zone "2, the nozzle 17 is supplied to the die spout 37 of the matrix by interacting the lever 18 with the cam 19, and the melt is injected into the matrix 37 due to the downward movement of the plunger of the injection cylinder 14

and a plunger 20 from a small hydraulic drive. In the zone "s is cooling the product. In the OA zone, the mold is unlocked by withdrawing the wedge section 27 of the pivoting lever 26 from under the slide 23 by engaging the roller 28 with the section 31 of the copier.

In the On zone, the mold is opened by moving the slide 23 upward using the copier 34.

In zone a, the product is removed from the punch 32 by means of a pusher (not shown) and removed from the rotor. After this, the process cycle of this position is repeated. This is how each position of the rotor works, creating a continuous flow of products. Such a machine, for example, a rotor from the beginning. with a diameter of 600 mm (at 36 molds, with an interposition pitch of 50 mm and a cooling time of 12 s), will have a productivity of 180 products per 1 minute.

In the proposed machine, the sliders can be loaded with technological forces several times larger, since they are in contact with the wedge surface.

pivot arms, and their power rollers interact with the shock absorber, configured for much less effort.

Claims (1)

Claims of the invention Rotary injection molding machine for thermoplastics, comprising a stationary plasticizer, a technological rotor with injection mechanisms, molds with matrices installed in the rotor disk, and punches associated with driving sliders for closing and opening the molds, an annular copier with a record The shock absorber, characterized in that, in order to expand the technological capabilities of the machine by increasing the locking and holding forces of the molds, it is equipped with driving rotary levers, each of which is made with a locking power roller and a wedge section and is installed to be in contact with a shock absorber in the locking zone, and each slider is made with a conical surface at the end to interact with the wedge section of the lever. Fi1 ®ig2