JPH0563816U - Screw movement lock device - Google Patents

Abstract

(57) [Summary] (Correction) [Purpose] Screw 21 after the measuring process of injection molding machine is completed.
The screw 21 is locked by the magnetic force of the electromagnet 30 to secure the retracted position. An electromagnet 30 that is excited by a suck back process completion signal is attached to a member that moves in synchronization with the forward / backward movement of the screw 21, and the electromagnet 3 near the backward limit of the screw 21.
0 and a supporting member facing each other with a slight gap maintained by the magnetic force of the electromagnet 30 to bring both members into contact with each other.
I tried to lock the movement of. [Effect] The backward limit stop position of the screw 21 can be easily set, and the screw 21 is automatically blocked by the completion signal of the suck back process, so that automation and remote operability are easy unlike the conventional manual adjustment method. Became.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a screw movement lock device that keeps a retracted position of a screw constant after completion of a measuring process of an injection molding machine.

[0002]

[Prior art]

 Japanese Unexamined Patent Publication No. 61-2900023 discloses a method of keeping the retracted position of the screw after the completion of the measuring process at a fixed position and keeping the stopped position at the starting point of the injection process to keep the amount of resin measured constant. ..

This method will be described with reference to FIG. 5. Reference numeral 1 is an injection cylinder having a nozzle 2 attached to the tip (on the left side in the figure) and a material input port 3 in the rear, and a screw 4 inside which can rotate and move forward and backward. It is provided. A ram 8 in a hydraulic cylinder 7 connected to the rear end of the cylinder 1 is connected to the rear portion of the screw 4, and the ram 8 is connected to a rotating shaft 9 such as a motor so as to be movable in the axial direction.

A flange 10 is fixed to the rear end of the screw 4, and a member 11 rotatably attached to the flange 10 is projected to the outside from a hole 12 formed in a side portion of the cylinder and is attached to a side surface of the cylinder. A stopper member 14 for restricting the retreat of the member 11 is movably attached to the guide rod 13 while the end portion is inserted into the horizontally mounted guide rod 13.

[0005] The material is then measured by rotating the screw 4 while applying a back pressure as usual. The screw 4 retracts due to the pressure in the cylinder 1 generated by the rotation, the rotation of the screw 4 is stopped at the position where the member 11 operates the detector 15, and the back pressure is reduced to complete the measurement.

After the rotation is stopped, the screw 4 retreats due to the cylinder internal pressure, but the retreating is stopped by the member 11 hitting the preset stopper member 14.

The stop position of the screw 4 is set by advancing and retracting the position of the stopper member 14 at the time of injection adjustment performed at the start of injection molding.

[0008]

[Problems to be solved by the device]

 However, this method considers a suckback in which the screw is forcibly retracted in order to release the pressure in the measuring resin after the completion of the measuring process every time the injection adjustment work is performed at the start of injection molding. Not only do they have to be set at the specified setting positions, but they also have to be changed many times during adjustment, which is troublesome and hinders workability.

Recently, it has been attempted to detect the screw position using an optical scale or to set the signal transmission position remotely to improve automation and operability. It was not possible to deal with this with a conventional manual device that requires moving the No. 14 to the required position and setting the screw stop position.

An object of the present invention is to eliminate the above-mentioned drawbacks and to provide a screw movement lock device which has good workability and automatically locks the screw.

[0011]

[Means for Solving the Problems]

 In order to achieve the above-mentioned object, the present invention is a screw movement lock device that keeps the retracted position of the screw constant after the completion of the weighing process of the injection molding machine. After the weighing process is completed, it is attached to the fixed part so that a slight gap is maintained between the supporting member that is close to the screw retreat and faces the mounting member, and one of the two members and the mating member. The screw movement lock device is characterized by having an electromagnet that is excited by a completion signal of a suck back process for releasing the pressure of the measuring resin, abuts both members by its magnetic force, and stops the movement of the screw. ..

[0012]

[Action]

 The electromagnet is excited by the output signal from the position where the suck back process is completed, and the screw can be automatically locked by the magnetic force.

[0013]

【Example】

 An embodiment of the present invention will be described with reference to FIGS. 1 to 3. Reference numeral 20 is a heating barrel, a nozzle (not shown) is attached to the tip (left side in the figure), and a screw 21 is rotatable on the inner diameter surface. In addition, it is inserted so that it can move back and forth by a stroke S in the axial direction.

A hydraulic ram 23 slidably mounted on the injection cylinder 22 is connected to the rear end of the screw 21, and a rotary shaft 25 of a motor 24 is connected to the ram 23.

The injection cylinder 22 to which the heating barrel 20 is attached is integrally assembled to an injection bracket 27 which is on a sliding plate (not shown) on the frame 26 and is movable when necessary.

A guide bar 28 is provided on the injection bracket 27, and a mounting plate 29 mounted with a motor 24 that moves in synchronization with the forward / backward movement of the screw 21 is provided with a guide plate 28 and a rotation shaft of the motor 24. 25, and is moved back and forth by the same length S as the stroke S of the screw 21.

An electromagnet 30 is fixed to a side surface of the mounting plate 29, and is excited by a suckback process completion signal for releasing the resin pressure of the resin material measured in the heating barrel 20 after the measurement process is completed. It is supposed to be done.

The frame 26 near the retreat limit of the mounting plate 29 maintains a slight gap with the electromagnet 30 fixed to the side surface of the mounting plate 29, and when the electromagnet 30 is excited, its magnetic force causes the electromagnet 30 to move. There is provided a support member 31 that comes into contact with the mounting plate 29, that is, the mounting plate 29, that is, the screw 21 is securely locked so as not to move.

With the above-described structure, when the weighing process is completed, the screw 21 retracts to the vicinity of the retract limit, and when the suck back process completion signal is transmitted, the electromagnet 30 is excited by the output signal. The support member 31 and the mounting plate 29 are brought into contact with each other due to the magnetic force, and are firmly locked.

In the above description, the example in which the electromagnet is provided on the mounting plate on which the motor is mounted is described, but the electromagnet is not limited to this, and the electromagnet may be mounted on either side of the mounting plate or the support member. Further, the member is not limited to the mounting plate as long as it is a member that moves in synchronization with the forward / backward movement of the screw, and for example, a member 40 for mounting the electromagnet 30 may be mounted on the screw 21 as shown in FIG. The other supporting member with which the screw abuts is not only fixed to the frame 26, but may also be attached to a member with which the screw 21 relatively moves by the distance S, for example, the injection bracket 27.

[0021]

[Effect of the device]

 According to the present invention, in the conventional injection molding, the work of adjusting the stop position at the screw retraction limit by setting various stopper positions is troublesome and the workability is poor, and the screw retraction is easy. In addition to setting the limit stop position, the screw is automatically locked by the completion signal of the suck back process, which facilitates automation and remote operability unlike the conventional manual adjustment method.

[Brief description of drawings]

FIG. 1 is a plan view showing an embodiment of the present invention.

FIG. 2 is a view showing an embodiment of the present invention and is a front view thereof.

FIG. 3 is a view showing an embodiment of the present invention and a side view thereof.

FIG. 4 is a view showing another embodiment of the present invention.

FIG. 5 is a diagram showing a conventional device.

[Explanation of symbols]

 20 Heating Barrel 21 Screw 22 Injection Cylinder 23 Hydraulic Ram 24 Motor 25 Rotating Shaft 26 Frame 27 Injection Bracket 28 Guide Bar 29 Mounting Plate 30 Electromagnet 31 Supporting Member 40 Mounting Member

Claims (1)

[Scope of utility model registration request] 1. A screw movement lock device for keeping a constant retracted position of a screw after completion of a measuring process of an injection molding machine, a mounting member which moves in synchronization with a screw advancing and retracting operation,
It is fixed to a fixed part such as a frame, and is attached to either side of the supporting member facing the mounting member near the screw retraction limit, and a small gap between the supporting member and the mating member, A screw movement lock device, comprising: an electromagnet that is excited by a completion signal of a suck back process for releasing the pressure of the measured resin after completion, brings the both members into contact with each other by the magnetic force thereof, and stops the movement of the screw. ..