CS271546B1 - Tip of injection moulding machine's threading device disassembly-coupled with injection moulding threading device - Google Patents

Abstract

The solution applies to a threader pin of an injection machine, dismountably connected with an injection threader and equipped with a check valve. The principle consists in the fact that the pin body (1) with a groove (2) in which there is sliding shoulder (9) of the threader's end (3), where the groove (2), linked with an opening (6) made in the front part of the pin body (1) is dismountably linked with the injection threader (3), fig. 1. The groove of the pin body (1) is linked with the opening (6), by means of a canal (4), in which there is sliding check valve (5) and where in the pin body (1) there are passage holes (7).<IMAGE>

Description

The invention relates to a screw tip of an injection molding machine releasably connected to an injection screw and provided with a non-return valve.

. When injecting plastic into the mold, it is necessary to use a screw with a tip and a non-return valve to apply the required dose for the desired spray and to inject it into the mold.

Various connections of the screw tip and the screw are known as well as different designs of the blind valves. The most common connection of the screw tip to the screw is using a thread. The disadvantage of this connection is that when replacing the screw tip it is necessary to use special tools to unscrew the screw tip from the screw. A disadvantage of the check valves used hitherto is that the back valve is located on the tip surface, causing it to be damaged by twisting or excessive wear during operation. Excessive wear of the bad valve does not guarantee the required dose of injection material, thereby impairing repeatability of good sprays.

The above-mentioned drawbacks are eliminated by the screw tip of an injection molding machine removably connected to an injection screw and provided with a spiral valve according to the invention, characterized in that a groove is formed in the tip body for detachably connecting the screw tip to the screw. a poor valve sliding therein and openings for flowing fluid material.

An advantage of the screw tip of an injection molding machine removably connected to an injection screw and provided with a non-return valve according to the invention is that the groove formed at only one end allows a removable connection without special tools. Such a connection of the screw tip and the screw may form a non-return valve between the screw tip groove face and the screw tip. The non-return valve sliding in the tip of the screw ensures perfect sealing of the liquid plastic material with minimal wear to the valve body. Replacement of a worn check valve is simple and quick, which makes it possible to increase the production of the injection machine.

The design of the screw tip of the injection molding machine releasably connected to the injection screw and provided with a check valve according to the invention is simpler and less energy intensive compared to the existing solutions.

An exemplary embodiment of a screw tip of an injection molding machine releasably with an injection screw and provided with a check valve according to the invention is shown in the accompanying drawing, wherein FIG. 1 shows a detachable connection of a screw body and a screw; FIG. Fig. 2 shows the position of the screw tip body with the non-return valve and the screw in the plasticization; 3 shows the position of the screw body with the check valve and the screw when injecting the plastic material, and FIG. 4 shows the position of the screw tip body with a check valve and a screw according to point 4 of the invention.

the tip of the screw machine of the injection molding machine releasably connected to the injection screw and provided with a non-return valve, consists of the tip body χ, with a groove 2 in which the shoulder 9 of the screw end 3 is displaceably mounted. .

During plasticization, the plastic material flows from the screw 3 fig. 1 through a groove 2 connected to the aperture 6 in the tip body χ in front of the screw tip of the injection molding machine.

By moving the screw 3 according to the arrow a, the screw body 1 moves according to the arrow b, thus closing the hole 6 in the screw body 1 and the plastic material upstream of the screw tip 1 is injected into the mold by the screw 3.

the screw tip of the injection molding machine releasably connected to the injection screw and provided with a non-return valve consists of a tip body 1 with a groove 2 connected to the bore 6 by means of a channel 4 in which the check valve 5 is slidably mounted.

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The plastic material is displaced in front of the screw tip body 1 by means of a screw 3, FIG. 2 via a groove 2 connected by 8 through holes 7 via a channel 4, while the sliding valve 5 closes the opening 6 in the tip 1 body.

When the plastic material is injected into the mold by the screw 3, FIG. _{3f a} slidably mounted check valve 5 in the channel 4 closes the leakage openings 7, thereby perfectly sealing the backward flow of the plastic material, allowing multiple repeatability of the desired good sprays.

Claims (4)

BACKGROUND OF THE INVENTION 1. The screw tip of an injection molding machine is removably connected to an injection screw and is provided with a check valve, characterized in that it is formed by a body in which an axis (2) is formed in which a sliding seat (9) 3), wherein the groove (2) is connected by an 8 hole (6) formed in the front of the tip body (1). Injection molding machine screw tip according to Claim 1, characterized in that the groove (2) is connected to the bore (6) by means of a kenal (4) in which the check valve (5) _# is slidably mounted, wherein the tips (1) are the through holes (7) formed. An injection molding machine screw tip according to claim 2, characterized in that the leakage holes are tangential and are located at the front of the tip body (i) at a distance at least equal to the width of the valve body (5). 4. The screw tip of the injection molding machine according to claim 2, characterized in that grooves (8) are formed in the front part of the tip body (1) and on the circumferential part of the bad valve body (5) forming channels together connecting the space behind the bad valve (5). opening (6).