JP2013091212A - Valve opening/closing mechanism using mold opening/closing actuating force - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a valve opening/closing mechanism using mold opening/closing actuating force, capable of opening/closing a valve without using an external controller and an air circuit by opening/closing the valve by the use of locomotion of a movable mold and a product ejecting mechanism as examples for driving.SOLUTION: This valve opening/closing mechanism using the mold opening/closing actuating force includes: recessed portions 14 on one side, provided in a fixed mold 1 and forming cavities; projecting portions 17 on the other side, formed on a core plate 16 provided in front of the movable mold 3, engaged with the recessed portions 14, and forming cavities; a movable plate 10 provided within the fixed mold 1 and having pressing force normally acting toward the recessed portions 14 in the fixed mold 1; valve pins 9 each having one end connected to the movable plate 10 and opening/closing gates; drive rods 15 provided in the movable mold 1 and provided to vertically installing the core plate 10; and insertion holes 13 for inserting the drive rods 15 and leading to the movable plate 10. The gates 8 leading to the cavities are opened/closed every time injection molding operation is performed.

Description

  The present invention relates to a valve opening / closing mechanism using a mold opening / closing operation force for an injection molding apparatus.

  In general, in the injection molding of thermoplastic resin, a mechanism for opening and closing the mold is distinguished from a mechanism for opening and closing the gate that leads to the cavity of the mold, and many of the mechanisms that open and close the gate use a valve pin. Alternatively, the control is often performed by a working fluid using hydraulic pressure or the like (see, for example, Patent Document 1).

  Further, in order to synchronize the gate opening / closing control by the valve pin and the mechanism for opening and closing the mold, it is often necessary to attach an expensive controller (for example, see Patent Document 2).

Japanese Patent No. 3991340 JP-A-5-31770

  Therefore, conventionally, a normal valve system takes a signal from opening / closing of a mold and opens / closes a gate by using a driving force of an air piston or the like by a controller to operate a valve pin.

  The present invention is made by paying attention to the above points, and by using a movable moving force and a product ejecting mechanism in a driving example, the valve is opened and closed without using an external controller or an air circuit. The present invention provides a valve opening / closing mechanism using a mold opening / closing operation force that can open and close the valve.

  The present invention has the following technical configuration in order to solve the above problems.

(1) One concave mold part forming a cavity provided in the fixed mold,
The other convex part that engages with the concave part and forms a cavity on the core plate provided in front of the movable mold,
A movable plate with a pressing force that is installed in the fixed mold and works toward the concave mold part of the fixed mold at all times,
A valve pin that opens and closes the gate with one end connected to the movable plate,
A drive rod provided in the movable mold and having a core plate mounted vertically;
An insertion hole through which the drive rod can be inserted and communicated with the movable plate;
A valve opening / closing mechanism using a mold opening / closing operation force, characterized in that the gate leading to the cavity can be opened and closed each time an injection molding operation is performed.

  (2) The core plate provided in front of the movable mold is provided so as to be inserted into the drive rod, and is provided with elastic pressure such as a coil spring so as to be able to follow the drive rod while maintaining an interval. A valve opening / closing mechanism using the mold opening / closing operation force described in (1) above.

  According to the present invention, it is possible to perform an injection molding operation by opening and closing a gate by moving a valve pin by using a force acting when a mold is opened and closed, which can be performed with a very simple configuration, Is a movable plate provided with a pressing force by a movable driving rod, which is formed by one core of the cavity with a core plate disposed in the front and is engaged with the other concave portion of the fixed mold. Thus, a small and effective injection molding operation can be performed such that the gate can be reliably opened and closed by the valve pin.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a longitudinal explanatory view of a main part configuration showing an embodiment of a valve pin opening / closing mechanism according to the present invention, showing a mold open state and a valve closed state. Longitudinal explanatory diagram of mold half-closed / valve closed state Longitudinal explanatory view of the product fully closed and valve open as above Longitudinal explanatory diagram of the product opening state with the mold open and valve closed Longitudinal explanatory view of the product opening state with the same mold opening and valve closing

  Hereinafter, an embodiment of the present invention will be described with reference to the drawings.

  1 is a fixed mold of an injection molding machine, 2 is a nozzle cylinder for injection of a molten resin of an injection molding machine connected to the fixed mold, 3 is a movable mold opposed to the fixed mold 1, and each time an injection molding operation is performed, Moves toward and away from the fixed mold 1.

  In the fixed mold 1, 4 is a molten resin main flow passage joined to the nozzle cylinder 2, 5 is a manifold communicating with the main flow passage 4, and a flow passage 6 is provided. 7 is a branch path formed perpendicular to both ends of the flow path 6, 8 is a gate formed at the tip of the branch path 7, and 9 is a valve pin vertically opened and closed in the branch path 7. Reference numeral 10 denotes a movable plate in which the base end of the valve pin 9 is fixed. The movable plate 10 is disposed adjacent to the manifold 5 so as to be movable in the axial direction in a space chamber 11 in the fixed mold 1, and 12 gates the movable plate 10. An elastic pressure member such as a spring is shown by pressing toward the side, and the gate 8 can be closed by moving the valve pin 9 via the movable plate 10 by the tension of the elastic pressure member 12. An insertion hole 13 communicates with the movable plate 10. Reference numeral 14 denotes one concave portion that forms a cavity that communicates with the gate 8.

  Next, with respect to the movable mold 3, 15 is a driving rod that can move in and out of the insertion hole 13 and abut against the movable plate 10, 16 is interlocked with the driving rod 15, and a distance w on the driving rod 15. 1 shows a core plate that can move only in the front-rear direction, and includes a convex part 17 that can be inserted into the concave part 14 of the fixed mold 1 to form a cavity.

  In the figure, a fixed mold 1 having a gate 8 and a concave mold portion 14 arranged in parallel corresponding to a pair of upper and lower valve pins 9 with respect to the molten resin divided by the manifold 5 is movable relative to the fixed mold 1. The mold 3 is also provided with a pair of upper and lower convex portions 17 via the drive rod 15, but the configuration is not necessarily specified.

  In the figure, a coil spring 18 is interposed to control the movement of the core plate 16 inserted through the drive rod 15 in the front-rear direction.

  Based on the above configuration, the operation of the present invention will be described with reference to the drawings.

  FIG. 1 shows a state before an injection molding operation, in which the movable mold 3 is separated from the fixed mold 1 and the core plate 16 is also separated from each other with an interval w.

  In this state, the molten resin previously injected from the molten resin injection nozzle cylinder 2 of the injection molding machine into the fixed mold 1 is blocked by the valve pin through the main flow passage 4, the manifold flow passage 6, and the branch passage 7. The gate 8 is full.

  From this state, the movable mold 3 shifts to the fixed mold 1, the driving rod 15 enters the insertion hole 13 of the fixed mold 1, the core plate 16 abuts on the fixed mold 1, and the convex mold portion 17 is the concave mold section 14. And the mold closing operation is completed, and a cavity (not shown) is formed (state shown in FIG. 2).

  In this state, the movable mold 3 is kept apart from the fixed mold 1 while maintaining the interval w, and the gate 8 is still closed by the valve pin 9 (die half-closed / valve closed state).

  Then, the movable mold 3 further advances, the drive rod 15 advances in the insertion hole 13, the tip of the drive rod 15 comes into contact with the movable plate 10, and the movable plate 10 is pressed into the pressurizing body 12 in the space 11. The valve pin 9 connected to the movable plate 10 is driven, the gate 8 is opened, and at the same time the front end of the movable mold 3 is in contact with the rear surface of the core plate 16 already in contact with the fixed mold 1. Abutting and strengthening the joint with the fixed mold 1 through the core plate 16, so-called mold clamping is completed (the mold is completely closed and the valve is opened in the product filling state in FIG. 3).

  Simultaneously with the completion of this clamping operation, the injection operation of the injection molding machine is executed without delay. The injected molten resin presses the molten resin previously filled in the fixed mold 1, passes through the opened gate 8, and is injected into a cavity (not shown) to complete the injection operation.

  Next, the movable die 3 moves backward to be separated from the fixed die 1, but since the tension of the coil spring 18 acts on the core plate 10, the movable plate 3 is released from the acting force of the driving rod 15 while maintaining the current state. The plate 10 is returned to the old state in the space chamber 11 by the tension of the pressurizing body 12, the valve pin 9 having the base end connected to the movable plate 10 is also returned, the gate 8 is closed, and the inside of the cavity is closed. The molded resin can be cooled and solidified in a state where the molded resin is securely held (in the mold open / valve closed product cooling state in FIG. 4).

  After the molding resin in the cavity is sufficiently solidified, when the movable mold 3 is further moved rearward, the core plate 16 is also moved back to the original position following the rearward movement of the driving rod 15. In the process of returning, the ejected product A can be obtained by peeling the product A in the adsorbed state on the convex portion 17 (the mold open / valve closed product take-out state in FIG. 5).

  In the figure, the arrow shown behind the movable mold 3 indicates the operating direction of the movable mold 3.

  The above is the basic process of one cycle for producing an injection molded resin product, and the same operation can be repeated to obtain the required number of products.

DESCRIPTION OF SYMBOLS 1 Fixed type 2 Nozzle cylinder 3 Movable type 4 Main flow path of molten resin 5 Manifold 6 Flow path 7 Branch path 8 Gate 9 Valve pin 10 Movable plate 11 Space chamber 12 Elastic pressure body 13 Insertion hole 14 Concave part 15 Drive rod 16 Core Plate 17 Convex part 18 Coil spring A Product w Interval

Claims (2)

One concave mold part forming a cavity provided in the fixed mold,
The other convex part that engages with the concave part and forms a cavity on the core plate provided in front of the movable mold,
A movable plate with a pressing force that is installed in the fixed mold and works toward the concave mold part of the fixed mold at all times,
A valve pin that opens and closes the gate with one end connected to the movable plate,
A drive rod provided in the movable mold and having a core plate mounted vertically;
An insertion hole through which the drive rod can be inserted and communicated with the movable plate;
A valve opening / closing mechanism using a mold opening / closing operation force, characterized in that the gate leading to the cavity can be opened and closed each time an injection molding operation is performed.   The core plate provided in front of the movable mold is provided so as to be inserted into the drive rod, and is provided with an elastic pressure such as a coil spring so as to be able to follow the drive rod while maintaining an interval. A valve opening / closing mechanism using the mold opening / closing operation force according to claim 1.

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