JPH0624187Y2 - Clamping device for injection molding machine - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial field of application] The present invention relates to a self-supporting toggle type mold clamping device in an injection molding machine.

[Conventional technology]

As a mold clamping device for injection molding machines, a self-supporting toggle-type mold clamping device in which a toggle mechanism that holds the mold clamping force in an expanded state is moved by a mold clamping drive device such as a hydraulic cylinder to perform mold clamping and mold opening. It has been known.

[Problems to be Solved by the Invention] In the above self-supporting mold clamping device, once the toggle mechanism is moved by the mold clamping drive device to a mold clamping completed state, unless the toggle mechanism is loosened by the mold clamping drive device, for example, Even if the hydraulic pressure of the hydraulic cylinder (mold clamping drive device) is reduced due to the stop of the operation, the mold clamping completed state is maintained.

In this way, if it is left for a long time with the mold clamping completed state,
During that time, large stress continues to be exerted on the mold and the tie bar, which may cause deformation of related parts and reduce machine and mold precision and life.

In order to prevent the above-mentioned harmful effects, in the past, the mold opening state is visually confirmed when the injection molding machine is stopped, but it is not uncommon to forget the confirmation.

The present invention provides a mold clamping device for an injection molding machine, which can alert the user with an alarm when operation is stopped in the mold clamping completed state and prevent it from being left in the mold clamping completed state. The purpose is to provide.

[Means for Solving the Problems]

In order to achieve the above object, a first invention is an injection molding machine configured to move a toggle mechanism that holds a mold clamping force in an extended state by a mold clamping drive device to perform mold clamping and mold opening. In the mold clamping device, the toggle mechanism is provided with a detection means for detecting that the toggle mechanism is in a mold clamping completed state, and the detection means and the mode changeover switch of the injection molding machine are turned on. In addition, an alarm means that operates when the mode changeover switch is set to the stop mode is additionally provided.

A second invention is a mold clamping device of an injection molding machine configured to move a toggle mechanism that holds a mold clamping force in an expanded state by a hydraulic cylinder to perform mold clamping and mold opening. A second detecting means is attached to detect that the toggle mechanism is in a mold clamping completed state, and a second detecting means detects that the electric motor is stopped by an electric motor that drives a hydraulic pump that sends hydraulic oil to the hydraulic cylinder. The detecting means is additionally provided, and the first detecting means and the second detecting means are provided with alarm means which is activated when both of the detecting means are turned on.

[Action]

In the injection molding machine, the mode changeover switch is set to the stop mode, and the electric motor that drives the hydraulic pump that sends the hydraulic oil to the hydraulic cylinder that is the mold clamping drive device is stopped to stop the operation.

In the first invention, when the mode changeover switch is set to the stop mode and the operation is stopped, if the mold clamping completion state remains, the detection means is turned on, so the alarm means is activated and the mold clamping is performed. Notify that it is held in the completed state.
If the mold is already open when the operation is stopped,
Since the detection means is off, the alarm means will not operate.

In the second invention, the second detecting means is turned on when the electric motor is stopped and the operation is stopped. At this time, if the mold clamping completion state is maintained, the first detecting means is also turned on, and the alarm means operates to notify that the mold clamping completion state is reached. If the mold is already opened when the electric motor is stopped, the alarm means will not operate because the first detection means is off.

〔Example〕

1 to 4 show an embodiment of the present invention.
Reference numeral 1 in the drawing is an end plate. A movable platen 3 is attached to the right side of the end plate 1 in FIG. 1 via a toggle mechanism 2, and a fixed platen 4 is attached to the right side of the movable plate 3.
Is provided. The movable platen 3 and the fixed platen 4 are provided with molds 5 and 6 which are detachable, and the movable platen 3 is an end plate 1.
As is well known, it is slidably supported by a plurality of tie bars (not shown) provided between the fixed plate 4 and the stationary platen 4.

The toggle mechanism 2 includes a pair of first toggle links 8 and 8 which are pivotally attached to the end plate 1 by a pin 7 at one end and a first toggle link at one end.
A pair of second toggle links 11, 11 pivotally attached to the other end of the toggle link 8 by a pin 9 and the other end pivotally attached to the movable plate 3 by a pin 10, and one end of the first toggle link 8 is a pin 12 A pair of auxiliary links 13 and 13 pivotally attached to each other, and a connecting member 15 that connects the pair of auxiliary links 13 and 13 pivotally attached to the other ends of the pair of auxiliary links 13 and 13 with pins 14 and 14, respectively. By moving the connecting member 15 by means of the hydraulic cylinder (mold clamping drive device) 16, the mold can be clamped as shown in FIG. 1 or the mold can be closed. The toggle mechanism 2
When the toggle mechanism 2 is clamped by the hydraulic cylinder 16, the hydraulic pressure of the hydraulic cylinder 16 decreases unless the movable member 15 is moved leftward in FIG. 1 by the hydraulic cylinder 16 to loosen the toggle mechanism 2. Is also a self-standing type in which the mold clamping completed state is maintained as it is, but this is also well known.

The connecting member 15 is provided with a dog 18 having a screw structure so as to be adjustable. The dog 18 contacts the limit switch (detection means) 19 to turn it on when the mold clamping is completed.

A hydraulic pump 21 is connected to the hydraulic cylinder 16 via an electromagnetic switching valve 20. The hydraulic pump 21 is rotationally driven by the electric motor 22 to send hydraulic oil to the hydraulic cylinder 16 to operate it. The electric motor 22 is provided with ab contact 22a which is turned on when the electric motor 22 is stopped.

Further, the injection molding machine equipped with a mold device mainly composed of the molds 5 and 6 and the toggle mechanism 2 is also provided with a mode changeover switch 23 (FIG. 3) as well known, and the mode changeover switch 23 is used. By turning and placing at the positions of each contact 23a, 23b, 23c, 23d, manual (23a), semi-automatic (2
3b), the fully automatic (23c) operation mode can be freely selected, and the operation can be stopped at the contact 23d position (OFF) in the stop mode. Further, the mode changeover switch 23 is provided with a switch piece 23e which is turned on when the mode changeover switch 23 is turned to the position of the contact 23d to enter the stop mode.

Further, reference numeral 24 is an alarm lamp (alarm means). The alarm lamp 24 is connected in series to the limit switch 19 and the switch piece 23e (contact 23d) of the mode changeover switch 23, and the lamp 24 is provided with an alarm buzzer (alarm means) 25 in parallel. The contact 22a of the electric motor 22 is connected in parallel to the switch piece 23e of the mode changeover switch 23.

Next, the operation of the mold clamping device of the injection molding machine according to the present invention constructed as described above will be described.

FIG. 1 shows a state in which the hydraulic cylinder 16 is extended to set the toggle links 8 and 11 of the toggle mechanism 2 in the extended state to complete the mold clamping, and the electromagnetic switching valve 20 is returned to the neutral state. Then, the dog 18 touches the limit switch 19 to turn it on. Since the toggle mechanism 2 is a self-supporting type as described above, it maintains a predetermined mold clamping force even when the electromagnetic switching valve 20 is neutralized.

In the mold clamping completed state of FIG. 1, the mode changeover switch 2
When the switch 3 is turned to the OFF position of the contact 23d to enter the stop mode, the switch piece 23e is turned on (see FIG. 4,
If "operation mode is OFF?" YES), the electric motor 2 that is rotationally driving the hydraulic pump 21 in the unload state
When 2 is stopped, the contact b 22a is turned on (FIG. 4, "Pump OFF?" YES), so either or both of the above are performed to stop the operation. If the alarm lamp 24 lights up, the alarm buzzer 2
5 sounds to notify that the mold clamping is completed. When the electromagnetic switching valve 20 is switched to reduce the hydraulic cylinder 16 and the toggle links 8 and 11 of the toggle mechanism 2 are bent to move the movable platen 3 to the left in FIG. 1 to open the mold. When the connecting member 15 is moved, the dog 18 is separated from the limit switch 19 and turned off, so that the alarm lamp 24 and the alarm buzzer 25 are deactivated. When the mold is already opened when the operation is stopped, the alarm lamp 24 and the alarm buzzer 25 are not activated from the beginning.

In the embodiment, both the b contact 22a and the switch piece 23e are incorporated in the electric circuit of the lamp 24 and the buzzer 25, but either one may be used. Lamp 24, buzzer 25, limit switch 19, contact 22a, mode selector switch 2
3. Specific structures and circuit configurations of the toggle mechanism 2 and the like are arbitrary and are not limited to those shown in the drawings.

[Effect of device]

As described above, the mold clamping device of the injection molding machine according to the first invention is configured such that the toggle mechanism that holds the mold clamping force in the expanded state is moved by the mold clamping drive device to perform the mold clamping and the mold opening. In the mold clamping device of the injection molding machine, the toggle mechanism is provided with detection means for detecting that the toggle mechanism is in the mold clamping completed state, and the detection means and the mode changeover switch of the injection molding machine detect the detection. A means for turning on the means and an alarm means for actuating when the mode changeover switch is set to the stop mode is additionally provided, and the mold clamping device of the injection molding machine according to the second aspect of the invention is such that the mold is in an expanded state. In a mold clamping device of an injection molding machine configured to move a toggle mechanism that holds a clamping force with a hydraulic cylinder to perform mold clamping and mold opening, the toggle mechanism is configured so that the toggle mechanism is in a mold clamping completed state. First detection to detect Second detection means for detecting that the electric motor is stopped is attached to an electric motor that drives a hydraulic pump that sends hydraulic oil to the hydraulic cylinder, and the first detection means and the second detection means are provided. By means,
Since alarm means that operates when both of these detection means are turned on is attached, in any case, if the operation is stopped in the mold clamping completed state, the alarm means will work and the mold clamping completed state Let us know. Therefore, it is possible to avoid a situation where the mold is left in the mold clamping completed state, and it is possible to prevent the accuracy and life of the machine and the mold from being shortened.

[Brief description of drawings]

The attached drawings show an embodiment of the present invention. FIG. 1 is a partially cutaway front view of a mold clamping device of an injection molding machine according to the present invention.
FIG. 2 is a circuit diagram of a limit switch and an alarm lamp, FIG. 3 is a front view of the mode changeover switch, and FIG. 4 is a flow chart of alarm generation. 2 ... Toggle mechanism 19 ... Limit switch (detection means) 23 ... Mode changeover switch 23e ... Switch piece (detection means) 24 ... Warning lamp (warning means) 25 ... Warning buzzer (warning means)

Claims (2)

[Scope of utility model registration request] 1. A mold clamping device of an injection molding machine configured to move a toggle mechanism for holding a mold clamping force in an extended state by a mold clamping drive device to perform mold clamping and mold opening. Detection means for detecting that the toggle mechanism is in the mold clamping completed state is provided, the detection means and the mode changeover switch of the injection molding machine are turned on, and the mode changeover switch is set to the stop mode. A mold clamping device for an injection molding machine, which is provided with an alarm means that operates in some cases. 2. A mold clamping device of an injection molding machine configured to move a toggle mechanism for holding a mold clamping force in an expanded state by a hydraulic cylinder to perform mold clamping and mold opening, the toggle mechanism being the toggle mechanism. A second detecting means for detecting that the electric motor is stopped is attached to the electric motor for moving the hydraulic pump for sending the hydraulic oil to the hydraulic cylinder. A mold clamping device for an injection molding machine, characterized in that, in addition to being attached, an alarm means that is activated when both of the first detecting means and the second detecting means are turned on is attached.