KR100368470B1 - A pair of hot runner valves equipped on one manifold - Google Patents

Abstract

The present invention relates to a hot runner valve device for molding a synthetic resin product, wherein a pair of hot runner valve devices are symmetrically mounted on both sides of a manifold, and the piston is positioned on an outer side of the manifold and the piston The valve pin is operated by the rod, which has less trouble, easy disassembly and assembly of the device, less damage to the piston parts such as packing and O-ring, and less damage to the piston parts. The hot runner valve device produces two plastic products at the same time, which makes it possible to mass-produce.

Description

A pair of hot runner valves equipped on one manifold}

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a pair of hot runner valve apparatus for molding plastic products, and more particularly, to a pair of hot runner valve apparatus for molding plastic products, in which a piston is installed on both sides of a manifold. .

One example of a conventional hot runner valve device for molding a plastic product is one piston 30 provided on one side of one manifold (manifold) 20 and the other side of the manifold, as shown in FIG. It is composed of one hot runner 40 installed in the valve pin 107, the internal tap water 110, and the external tap water 500 in the hot runner 40 is also composed of one such hot runner valve It is difficult to mass-produce plastic products in a short time when the plastic products are molded by a device. If a large quantity of plastic products are produced, a piston 30 and a hot runner 40 are installed in one manifold 20. The disadvantage is that a large number of runner valve devices have to be installed, thereby requiring a large space.

As another example of the hot runner valve device for molding plastic products, as shown in FIG. 4, the hot runners 800, 800 ′ and the piston 600, 600 ′ of the hot runner valve device are provided on both sides of the manifold. Another main manifold under the main manifold 100 located at the center for installing the external injection water supply 500 for the injection of the synthetic resin into the internal flow paths 110 and 110 ′ of both valve devices. 100 ') and the auxiliary manifolds 200 and 200' are installed on both sides of the main manifold 100, and then the piston 600 of the hot runner valve device (in both sides of the main manifold 100). 600 ') and the nozzle bodies 900 and 900' of the hot runners (nozzles) 800 and 800 'are mounted inside the auxiliary manifolds 200 and 200'. ') And an external injection water supply 500 for injecting molten synthetic resin to the outside via the auxiliary manifolds 200 and 200' on both sides, and in the upper main manifold 100. When the pistons 600 and 600 'are reciprocated by the pneumatics 700, 700' and 700 "in the space portions 300 and 300 ', they are fixed to the pistons 600 and 600'. The valve pins 107 and 107 'open and close the valve gates 1000 and 1000' of the hot runners (nozzles) 800 and 800 '. When the molten synthetic resin is supplied to the internal water supply (110) (110 ') through the 500, it is supplied to the plastic molding mold through the valve gates (1000) and (1000'). It is inconvenient to newly install the auxiliary main manifolds 200 and 200 'on both the lower main manifold 100' and the heads of the pistons 600, 600 'and the valve pins 107, 107'. Since it is located in the upper main manifold 100 and reciprocates in the inner spaces 300 and 300 ', the entire hot runner valve device, including the pistons 600 and 600', is severely expanded and contracted due to heat. A difficult and complex, it is difficult to keep an exploded assembly of the parts of the device, and there was a drawback because the durability of the vulnerable parts such as heat seal or O-ring is also weak, do not you get to keep old devices are easily damaged or that are out of balance.

The present invention improves the shortcomings of the above-mentioned hot runner valve device for molding a plastic product as described above, so that there is no need for an auxiliary manifold or another main manifold. Install a device (manifold and piston device and hot runner valve), but by providing a hot runner valve device with the piston installed outside of the manifold, the piston is easy to disassemble and assemble and receives less heat from the valve device. It is possible to mass-produce two molded products at the same time in the hot runner valve device, which is a plastic product molding device, while the mounting part of the product is not deformed by heat and always maintains the balance and the damage of packing or O-ring is reduced by heat. When described in detail with reference to the accompanying drawings as it is as follows.

1 is a longitudinal sectional view of a pair of hot runner valve apparatus according to the present invention.

Figure 2 is a cross-sectional view of a pair of hot runner valve device according to the present invention.

3 is a cross-sectional view of one example of a conventional single hot runner valve.

4 is a cross-sectional view of another example of a conventional single hot runner.

* Explanation of symbols for main parts of drawing *

DESCRIPTION OF SYMBOLS 1: Manifold 2: Piston body 3, 3 ': Piston rod 4, 4': Upper and lower holder 5: Cylinder 6, 6 ', 6a, 6b: Bolt 7: Valve pin 10: Pin head 11: Internal ballistic 12: External flow paths 13a, 13b, 13a ', 13b': Pneumatic 14: Nozzle head 15: Valve gate 16: Nozzle body 17: Cylinder

In a plastic molding hot runner valve device comprising a manifold, a piston, and a hot runner valve (nozzle), a U-shaped space 5 is formed on both sides of a single manifold 1, and then a pneumatic 13a ( The piston rods 3 and 3 'are embedded in the space 5 while the pistons 2 actuated by 13b are located on both outer sides of the manifold 1 and the piston rods 3 and 3 ') The upper and lower holders having the pin heads 10 of the valve pins 7 which open and close the valve gate 15 while moving left and right in the inner tap water 11 by bolts 6 and 6'. (4) (4 ') is fixedly installed with bolts (6a) and (6b), and the piston (2) is reciprocally limited only in contact with the nozzle head (14) in contact with the outer peripheral surface of the nozzle (hot runner) body (6). The inner raceway 11 of the hot runner valve device is provided with a cylinder 17 for movement, and the external injection raceway 12 divided into a T-shape in the manifold 1 in one body is usually used. In order to mold the plastic product with the apparatus of the present invention configured as described above, both pistons 2 are simultaneously operated by pneumatics 13a and 13b to be mounted inside the pistons 2. The cylinder 17 is reciprocated on the outer circumferential surface of the nozzle body 16 and pins are attached to the holders 4, 4 'mounted at the ends of the piston rods 3, 3' by the reciprocating motion of the cylinder. The valve gate 15 is opened by moving the valve pin 7 having the head 10 fixed thereto, and then melt-molded resin is formed in the molding mold via the external injection water supply 12, the internal water supply 11, and the valve gate 15. After molding the plastic product by injecting the piston (2) to the reverse movement and the method to block the valve gate 15 by the valve pin (7) by the reverse operation and repeat the above to obtain a plastic product.

The hot runner valve device in which a pair of hot runner valves is mounted on one manifold of the present invention configured as described above has a piston (2) mounted on an outer side of the manifold (1), and thus generates heat generated in the device. Since it does not receive heat, the expansion and contraction of the device is small so that the balance can be kept constant. Also, since the piston is mounted on the outside and all the assemblies are mounted on one manifold, disassembly and assembly are extremely easy. It has less heat to parts that are vulnerable to heat, which improves durability and eliminates the need to assemble multiple manifolds.

Since the hot runner valve device for molding a plastic product of the present invention configured as described above is provided with two hot runners in one manifold 1, two plastic products can be molded at the same time, and the assembly and disassembly are easy and the material is low. The manufacturing cost is reduced.

Claims (1)

In the plastic molding hot runner valve device consisting of a manifold, a piston and a hot runner valve (nozzle), a U-shaped space 5 is formed on both inner sides of a single manifold 1, and then pneumatic 13a. The piston rods 3 and 3 'are embedded in the space 5 while the pistons 2 actuated by 13b are located on both outer sides of the manifold 1 and the piston rods 3 ( 3 ') up and down in which the pin head 10 of the valve pin 7 for opening and closing the valve gate 15 is fixed with bolts 6 and 6' while moving left and right in the internal bath 11. The holders 4 and 4 'are fixed by bolts 6a and 6b, and the piston 2 has a limited reciprocating motion only in contact with the nozzle head 14 in contact with the outer circumferential surface of the nozzle body 6. The inner tap 11 of the hot runner valve device is installed with a cylinder 17, and the trough-shaped outer injection tap 12 in the one-piece manifold 1 is connected to a conventional room. A pair of hot runner valve units mounted on a manifold, characterized in that connected by law.