JPS60132709A - Electrical mold clamping mechanism of molding machine - Google Patents

Abstract

PURPOSE:To keep a calmping force at the place nearest to a rotary member to move a movable panel by providing a mold clamping force keeping mechanism to fix the rotary member on the fixed stock behind the movable panel throught a brake gear. CONSTITUTION:The brake mechanism 32 is energized and the opening, closing and clamping of a mold are conducted. The instant the brake device 32 is made free from an energizing state when molds 14, 14 are closed and clamped by the move of the movable panel 13, braking action occurs by the coil spring 40 to keep mold clamping force. Though the turning effort to the transmission shaft 18 is released by the operation of the clutch mechanism the mold clamping force against injection pressure is retained.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an electric mold clamping device for a synthetic resin molding machine using a servo motor as a driving force.・In an electric mold clamping device that uses a motor as the driving force, even if the rotational force of the servo motor can be used to open and close the mold, clamp the mold, etc., the rotational force cannot be used to maintain the mold clamping force. is considered extremely difficult.

For this reason, the electric mold clamping device requires means for retaining the mold clamping force.

This invention attempts to maintain the mold clamping force using an electric brake, and its purpose is to maintain the mold clamping force at the position closest to the rotating member that moves the movable platen. The object of the present invention is to provide an electric mold clamping device that can perform the following tasks.

The features of the present invention for the above-mentioned purpose include: a fixed plate provided on the machine base; a movable plate disposed so as to be movable forward and backward with respect to the fixed plate using tie bars as guide members; A mold clamping screw shaft with a threaded groove around the periphery; a rotating member provided on a fixed plate of the three movable back portions that is internally threaded with the screw shaft and moves the screw shaft in the axial direction; A transmission shaft having one end connected to a servo motor and the other end having a transmission gear that meshes with the gear of the rotating member, and a transmission shaft that is attached to the fixed plate side of the back of the movable plate and fixes the rotating member via the gear. The electric mold clamping device is constructed from a mold clamping force holding device using a brake device.

The present invention will be explained in detail below using illustrated examples.

In the figure, 1 is a mold clamping device, and 2 is an injection device.

The mold clamping device 1 includes a pair of solid wax discs 10;
It has a required number of tie bars 12, 12 constructed over the entire length, and a movable platen 13 movably attached to the tie bars 12, 12. Molds 14 and 14 are attached to the facing surfaces of the fixed plate 11 and the movable plate 13, respectively, and on the back of the movable plate 13, there is a large diameter screw shaft with a sol thread groove on the circumferential surface. 15 is connected. As shown in FIG. 2, this screw shaft 15 is connected to the inner end of a rotating member 16 made of a cylindrical body, which is rotatably mounted on a fixed platen io on the back of a movable plate, which serves as a fixed member, using a ball bearing or the like. 16b
The rotating member 16 is screwed into the screw receiving member 16a having a
It moves in the axial direction by the rotation of.

Further, a gear 17 is attached to the outer end of the rotating member 16, and this gear 17 and a transmission gear 19 at the end of the transmission shaft 18 mesh with each other.

The transmission shaft 18 is rotatably supported at the lower part of the fixed plates 10 and 11, and the gear 17 is located close to the fixed plate 10.
The outer end has a transmission gear 19 that meshes with the inner end, and the inner end is provided with a spline.

A transmission shaft n disposed in the lower part of the housing 21 of the injection device 2 is connected to the transmission shaft 18.

A joint is connected to the inner end of the transmission shaft n via an electromagnetically actuated clutch mechanism so as to be freely accessible and detachable. This joint member has a shaft portion rotatably and slidably supported by the housing 21, and a spline that is integrally formed on the outer end of the shaft portion and that receives the inner end portion l) of the transmission shaft 18. It consists of a cylinder made of

Also, at the outer end of the transmission shaft n, a sensor is attached to the lower surface of the housing 21. Motor 5 is now connected.

This connection is made by belt pulleys provided at each shaft end.

A drive bell) 28 is mounted on the drive bell.
) 28 and the transmission shaft n and 18 by the serge motor 5.
It is so that it can be rotated.

Sir above? The injection device 2 is operated by the motor B via a plurality of gears attached to the transmission shaft n along with a clutch mechanism, and the mold clamping device 1 is operated by the transmission gear 19 attached to the transmission shaft 18. This is done via the gear 17 of the member 16. That is, when the rotating member 6 is rotated clockwise by the gear 17, the threaded shaft 15 is on the rotating member side. −
The movable platen 13 is moved in the mold clamping direction by being pushed inward by the screw thread 16b and the thread groove on the circumferential side of the screw shaft.

In mold clamping using such mechanical means, the rotational force of the servomotor 60 cannot be used as is to maintain the mold clamping force, and an additional mold clamping force retaining device is required.

FIGS. 2 and 3 show an example of the mold clamping force holding device, which is composed of a brake gear 31 meshing with the transmission gear 19 and a brake device 32.

The brake gear 31 is fixed to a rotating shaft provided between the fixed plate 1o and the housing outside the fixed plate,
Further, the brake device 32 is fixed to the outside of the housing from which the outer end of the rotating shaft protrudes. This brake device 32 includes an axially movable inner driver attached to the outer end of the rotating shaft using a key, and an armature 37 that fixes the inner driver with a mounting plate 36 fixed to the housing 33. and armature 37
This is a negative operation brake composed of a field core path provided on the outside of the field core, a torque adjustment delt 39 provided in the field core, and a coil spring 4o, in which the armature 37 acts as a brake due to the pressure of the coil spring 40,
The mold clamping force is maintained by fixing the brake gear 31 coaxial with the inner driver 35.

In the mold clamping device 1 having the above structure, when the brake device 32 is in the excited state, the sensor? Mold opening/closing and mold clamping can be performed with 50 rotational force of the motor. Furthermore, when the molds 14, 14 are completely closed due to the i-movement of the movable platen 13 and are in the mold clamping state, when the excitation of the brake device 32 is stopped, the coil spring 40 immediately activates the brake to maintain the mold clamping force. Even if the rotational force on the transmission shaft 18 is released by operating the clutch mechanism, the mold clamping force opposing the injection pressure is maintained.

As described above, in this invention, a mold clamping force holding device is installed on the fixed plate behind the movable plate to fix the rotating member via a brake gear, and the mold is clamped by the rotational force of the serve motor. Since the force can be maintained after the force is reached, there is no change in the mold clamping force even if the rotational force of the servo motor is removed, and during that time the servo motor can use the rotational force of the motor as the drive source for the injection device. can. □In addition, since the mold clamping force holding position is provided close to the rotating member, the operation effect is good, and the mold clamping force can be sufficiently maintained by the pre-key position with a small braking force.1, Negative actuation brake device It has features such as being able to improve not only responsiveness but also safety and overall safety.

The drawings show one embodiment of an electric mold clamping device for a molding machine according to the present invention, and FIG. 1 is a partially vertical side view of the molding machine, FIG. 2 is a vertical side view of the mold clamping device, and FIG. The figure is a partially cut away end view of the mold clamping device, and the fourth figure is a longitudinal sectional side view of the brake device.

l... Mold clamping device 2... Injection device 3.
...Machine base 10, 11...Fixed plate 13
......Movable platen 15...Screw shaft 16...
...Rotating member 1611L...Screw receiving member 17...Gear 18...Transmission shaft 19.
...Transmission gear 5...Sage motor addition
...... - Clamping force retaining device 31... Brake gear 32:)°-',,-ni":", ζ Patent applicant ゛□ 1 person other than Nissei Jushi Kogyo Co., Ltd.

Claims (1)

[Claims] A fixed plate provided on the machine base, a movable plate that is arranged to move forward and backward with respect to the fixed plate using a guide member such as a wiper, and a movable plate that is connected to the back of the movable plate and has a threaded groove around the periphery. The screw shaft for mold clamping is screwed inside the screw shaft, and the screw shaft is moved in the axial direction.v3 A rotary member installed on a fixed plate at the back of the movable plate, and one end of the rotary member connected to the motor. , a transmission shaft having a transmission gear at the other end that meshes with the gear of the rotating member;
1. An electric mold clamping device for a molding machine, comprising a mold clamping force holding device using a brake device, which is attached to the fixed platen side of the back of the movable platen and fixes the rotating member via gears.