JPH04122014U - Shut-off nozzle device for injection molding machine - Google Patents

Abstract

(57) [Summary] [Purpose] This relates to a shut-off nozzle that opens and closes the nozzle passage of the screw cylinder of an injection molding machine, and operates the cylinder 15 that presses the nozzle 3 against the mold 7 and the valve 5 that opens and closes the passage of the nozzle 3. Also used for. [Structure] A lever 8 moves up and down the valve 5 that opens and closes the passage of the nozzle 3, and a rod 20 is connected between the tip of the piston rod 16 of the cylinder 15 and the lever 8 to operate the lever 8.
A stopper 2 connected to the piston rod 16 and arranged on the piston rod 16
Depending on the contact position between the stopper 25 and the arm 14 that is integrated with the injection casing 13, the valve 5 can be opened, the valve 5 can be closed, and the nozzle 3 can be pressed against the mold 7. .

Description

[Detailed explanation of the idea]

0001

[Industrial application field]

This invention is a shut-off switch that opens and closes the nozzle passage of the screw cylinder of an injection molding machine. The present invention relates to a method for driving a fan nozzle.

0002

[Conventional technology]

A conventional shut nozzle device for an injection molding machine will be explained with reference to FIG. In an injection molding machine, when plasticizing the resin 4 by rotating the screw 2, one Generally, the nozzle 3 at the tip of the screw cylinder 1 is open, but When plasticizing resin or foamable resin, use the melt stored at the tip of screw 2. To prevent melted resin from leaking from the tip of nozzle 3, open and close the passage of nozzle 3. A shut-off nozzle device is used that can The shut-off nozzle device includes a valve 5 that opens and closes the passage of the nozzle 3; A lever 8 that operates up and down, a cylinder 9 that operates the lever 8, and a pressure applied to the cylinder 9. It is composed of a switching valve 11 that supplies power oil. To explain its operation, at the same time as the start of plasticization, the solenoid a of the switching valve 11 is excited, pressure oil is guided to the oil chamber on the piston rod side of cylinder 9, and the piston 10 moves in the backward direction (to the right in the figure). When the piston 10 retreats, the lever 8 The valve 5 is lowered through the nozzle 3 to close the passage of the nozzle 3 and prevent the screw from forming during plasticizing. The molten resin stored at the tip of the nozzle 2 is prevented from leaking from the nozzle 3. Once a predetermined amount of molten resin is stored at the tip of screw 2, the next step is the injection process. Ru. Simultaneously with the start of injection, solenoid a of the switching valve 11 becomes de-energized, and the pressure oil flows into the cylinder. The piston 10 is guided to the oil chamber on the opposite side of the piston rod of the cylinder 9 and moves forward. When the piston 10 moves forward, the valve 5 is pushed up via the lever 8, and the nozzle 3 The passage is opened, and the molten resin that was being measured is pushed by screw 2 into the mold. Injected into 7. During injection, make sure that the molten resin injected into the mold 7 does not leak from the contact surface between the nozzle 3 and the mold 7. As shown, the nozzle 3 is pressed against the mold 7 by the cylinder 15.

0003

[Problem that the idea aims to solve]

However, in such a conventional shut-off nozzle device, the valve 5 is opened and closed. a cylinder 9 for supplying pressure, a switching valve 11 for sending pressure oil to the cylinder 9, and a pipe 12. , and the equipment was large and expensive. In addition, a hydraulic Arranging equipment and piping may cause oil to scatter due to damaged parts, resulting in a fire accident. However, in order to prevent this, the design of this device was difficult. The purpose of this invention is to solve these problems that conventional devices have. ing.

0004

[Means to solve the problem]

This invention allows the passage of the nozzle (3) located at the tip of the screw cylinder (1) to In a shut-off nozzle device of an injection molding machine equipped with a valve (5) that opens and closes , a lever that operates the valve (5) up and down to open and close the passage of the nozzle (3); (8) and a cylinder (15) for pressing the nozzle (3) against the mold (7). The tips of the piston rods (16) are connected by a rod (20), and the piston rods (16) are connected by a rod (20). A stopper (24) and a stopper (25) are provided on the stone rod (16), and the The stopper (24) and stopper (25) are integrated with the injection casing (13). The valve (5) can be opened or closed depending on the contact position with the arm (14). The above problem can be solved by pressing the nozzle (3) against the mold (7). Solve the problem.

[0005]

[Effect]

The piston 21 of the cylinder 15 moves in the forward direction (to the left in the figure), and the piston lock When the stopper 25 of the door 16 hits the arm 14 that is integrated with the injection casing 13 , the passage of the nozzle 3 is opened, and the nozzle is pressed against the mold 7. ing. Also, when the piston 21 moves in the backward direction (rightward in the figure), the piston rod 16 The rod 20 connected to the lever pulls the lever 8, and the lever 8 pulls down the valve 5. The passage of the nozzle 3 is closed.

[0006]

【Example】

Hereinafter, embodiments of the present invention will be described in detail based on the drawings. FIG. 1 is a diagram showing an embodiment of the present invention, in which a valve 5 for opening and closing a passage of a nozzle 3 is shown. lever 8 that moves up and down, and a piston rod of cylinder 15 for operating lever 8. A rod 20 connects the tip of the door 16 and the lever 8, and is placed on the piston rod 16. The stopper 24 and the injection casing 13 are integrated with each other. Depending on the position of contact with the arm 14, the opening of the valve 5, the closing of the valve 5, and , the nozzle 3 can be pressed against the mold 7. In addition, the limit switch 26 has a stopper 24 integrated with the injection casing 13. The ball is arranged so that the hitting point is near the contact with the arm 14 which is .

[0007] Next, we will discuss the operation of the shut-off nozzle device of the injection molding machine configured as described above. I will explain. At the same time as plasticization starts, solenoid a of the switching valve 17 is energized, and pressure oil flows into the cylinder. The piston 21 is guided to the front oil chamber 22 of 15 and retreats. The piston along with the piston 21 When the stone rod 16 retreats, the lever 8 is pulled via the rod 20 and the valve 5 is is lowered and the passage of the nozzle 3 is closed. Furthermore, the retraction of the piston rod 16 Therefore, the stopper 24 is in contact with the arm 14 that is integrated with the injection casing 13. Near the point of contact, the stopper 25 hits the limit switch 26, thereby , the solenoid a of the switching valve 17 is de-energized, and the piston 21 stops.

[0008] Next, in the injection process, the solenoid b of the switching valve 17 is energized at the same time as the injection starts. Pressure oil is then introduced into the rear oil chamber 23 of the cylinder 15, and the piston 21 moves forward. As the piston 21 moves forward, the piston rod 16 moves from the stopper 24 to the stopper. -25 and press the lever 8 via the rod 20 to release the valve. Bu 5 is pushed up. The stopper 25 is an arm integrated with the injection casing 13 14, the passage of the nozzle 3 is opened and at the same time the screw cylinder 1 A nozzle is installed to prevent the molten resin injected into the mold 7 from leaking from the contact surface between the nozzle 3 and the mold 7. The nozzle 3 is now pressed against the mold 7.

[0009]

[Effect of the idea]

As is clear from the above explanation, the present invention has a system for pressing the nozzle 3 against the mold 7. The cylinder 15 also operates the valve 5 that opens and closes the passage of the nozzle 3. Therefore, as in the past, cylinder 9, switching valve 11, and piping for operating the valve are required. 12 is not required, the device can be made very compact, and it can be manufactured at low cost. I can do it. In addition, hydraulic equipment is installed near the screw cylinder 1, which becomes hot due to heating by the heater 6. , piping, etc. were not arranged, which caused oil to splatter due to broken parts, causing a fire and an accident. There is no fear of it happening.

[Brief explanation of drawings]

FIG. 1 is a diagram showing an embodiment of the shut-off nozzle device (during injection, during valve opening) of the present invention.

FIG. 2 is a diagram showing a conventional shut-off nozzle device (during injection and valve opening).

[Explanation of symbols]

1...Screw cylinder 2...screw 3... Nozzle 4...Resin 5...Valve 6... Heater 7... Mold 8...Lever 9...Cylinder 10...Piston 11...Switching valve 12...Piping 13...Injection casing 14...Arm 15...Cylinder 16...Piston rod 17...Switching valve 18...Pump 19...Motor 20...rod 21...Piston 22...Front oil chamber 23... Rear oil chamber 24...stopper 25...Stopper 26...Limit switch a...Solenoid b...Solenoid

Claims (1)

[Scope of utility model registration request] 1. A shut-off nozzle device for an injection molding machine equipped with a valve (5) for opening and closing a passage of a nozzle (3) disposed at the tip of a screw cylinder (1), wherein the passage of the nozzle (3) is A rod is inserted between the lever (8) that operates the valve (5) to open and close the valve (5) up and down, and the tip of the piston rod (16) of the cylinder (15) that presses the nozzle (3) against the mold (7). (20), and the stopper (2) is connected to the piston rod (16).
4) and a stopper (25).
4) Depending on the contact position between the stopper (25) and the arm (14) integrated with the injection casing (13), the valve (5) can be opened or closed, and the nozzle (3) can be moved into the mold (7). ) A shut-off nozzle device for an injection molding machine.