JPH11333896A - Motor for clamping device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a motor mounting structure which enables easy changing of a motor capacity. SOLUTION: A motor mounting structure is provided with a first motor flange 4 for mounting to a toggle support 12, a second motor flange 5 arranged with a specified distance from the first motor flange 4 and a motor case composed of a cylindrical stator frame 6 arranged between the first motor flange 4 and the second motor flange 5. A stator 3 is fixed to the stator frame 6 by a shrink fit, and the stator 3 is caught between the first motor flange 4 and the second motor flange 5 by locking a tie rod 7 arranged between the first motor flange 4 and the second motor flange 5.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a motor for a mold clamping device in an injection molding machine.

[0002]

2. Description of the Related Art Conventionally, in an injection molding machine, a resin heated and melted in a heating cylinder is injected at a high pressure, filled in a cavity of a mold, cooled and solidified in the cavity, and the mold is molded. It is designed to open and take out molded products.

[0003] The injection molding machine has a mold clamping device and an injection device, and the mold clamping device has a fixed platen and a movable platen.
The mold clamping cylinder moves the movable platen forward and backward to move the mold toward and away from the mold. On the other hand, the injection device includes a heating cylinder for heating and melting the resin supplied from the hopper, and an injection nozzle for injecting the melted resin, and a screw is disposed in the heating cylinder so as to be able to move forward and backward. The resin can be injected by moving the screw forward, and can be measured by moving the screw backward.

An injection molding machine using a servomotor for moving a mold clamping device forward and backward has been provided. FIG. 2 is a front view of a conventional mold clamping apparatus, FIG. 3 is a side view of the conventional mold clamping apparatus, and FIG. 4 is a detailed view of a conventional servo motor. Note that the upper side of the center line in FIG. 2 indicates the mold closed state of the mold clamping device, and the lower side of the center line indicates the mold open state of the mold clamping unit.

In FIGS. 2 to 4, reference numeral 11 denotes a movable platen to which a movable mold (not shown) is attached, 12 denotes a toggle support, and a tie bar 13 connects the toggle support 12 and a fixed platen (not shown). The movable platen 11 slides along the tie bar 13 to close, close, and open the mold. For this purpose, a toggle mechanism 14 is provided between the toggle support 12 and the movable platen 11, and the toggle mechanism 14 is operated by a driving device 15 to move the movable platen 11 forward and backward.

The toggle mechanism 14 is connected to the toggle lever 16 and the movable platen 11 which are swingably supported by the toggle support 12 and swings with respect to the toggle lever 16 and the movable platen 11. An arm 17 freely supported, a crosshead 20 fixed to a ball screw shaft 18 via a nut 19, and a toggle lever-1.
6 and the crosshead 20, and comprises a toggle lever 16 and a toggle lever 21 slidably supported by the crosshead 20.

In the center of the toggle support 12,
The driving device 15 is disposed so as to project rearward. The driving device 15 is directly fixed to the toggle support 12 by bolts 22 (see FIG. 3). The driving device 15 is rotatably supported by the driving device case 23, the servo motor 24 disposed in the driving device case 23, and the driving device case 23, and A hollow rotary sleeve 25 serving as an output shaft for outputting the rotation of the bomotor 24;

The drive device case 23 is a toggle support 1
2, a side wall 26 disposed in contact with the side wall 2, a side wall 27 disposed opposite to the side wall 26, and a cylindrical cover 28 connecting the side walls 26, 27. In addition, Serbomo
The stator 24 comprises a stator core 29 fixed to the drive case 23 and a rotor core 30 rotatably disposed on the inner peripheral side of the stator core 29. The rotary sleeve 25 includes a large diameter portion 25a and a small diameter portion 25b formed rearward from the large diameter portion 25a. The large diameter portion 25a is rotatably supported by a bearing 31 on a side wall 26. The small diameter portion 25 b is rotatably supported by the bearing 31 on the side wall 27.

A ball screw nut 32 is fixed to the inner periphery of the large diameter portion 25a by a bolt 33.
The rotor core 30 is fitted and fixed to the outer periphery of the small diameter portion 25b. The ball screw shaft 18 extends rearward from the crosshead 20, penetrates the toggle support 12, and is screwed to the ball screw nut 32. And servo motor 2
By driving the ball screw nut 18 to rotate the ball screw nut 32, the ball screw shaft 18 is advanced and retracted.
In the retreat limit position, the toggle mechanism 14 is positioned below the center line in FIG. 2 to form a mold-open state of the mold clamping device, and in the forward limit position of the ball screw shaft 18, the toggle mechanism 14 is The mold closed state of the mold clamping device can be formed in a state shown above the center line in FIG.

As described above, when the ball motor 24 is driven to rotate the ball screw nut 32, the ball screw nut 32 and the ball screw shaft 18 convert the rotary motion into a linear motion. , The toggle mechanism 14 is operated, and the mold is closed, closed, and opened.

As described above, the servo motor 24 constituting the above-mentioned conventional driving device is such that the driving device 15 is directly connected to the toggle support 1 by the bolt 22 as shown in FIG.
It is fixed to 2. The driving device 15 is rotatably supported by the driving device case 23, the servo motor 24 disposed in the driving device case 23, and the driving device case 23, and A hollow rotary sleeve 25 serving as an output shaft for outputting the rotation of the bomotor 24;

The drive case 23 is a toggle support 12.
A side wall 26 is provided in contact with the side wall 26, a side wall 27 is disposed opposite to the side wall 26, and a cylindrical cover 28 connects the side walls 26, 27.

With such a structure, the servomotor 24 is housed inside the cylindrical cover 28 on the left and right side walls 26 and 27 of the drive case 23. In this case, even if an attempt is made to change the length L (motor thickness) of the rotor core 30, it is not easy to change the motor capacity because of the limitation of the driving device case 23.

[0014]

SUMMARY OF THE INVENTION The present invention solves the problems of the conventional servomotor and provides a motor mounting structure capable of easily changing the capacity of the motor. As an issue.

[0015]

(A) a fixed platen;
(b) a toggle support, (c) a movable platen opposed to the fixed platen and freely movable along a tie bar, and (d) disposed between the movable platen and the toggle support. And a toggle mechanism for moving the movable platen forward and backward, and (e)
A motor disposed on the rear end face of the toggle support;
(f) a hollow output shaft fixed to the rotor of the motor;
(g) a ball nut fixed to the output shaft; and (h) a ball nut.
A ball screw shaft which is screwed with the ball nut and is advanced and retracted in the output shaft with the rotation of the ball nut; and (i) a cross fixed to the ball screw shaft and connected to the toggle mechanism. A mold clamping device having a head;
First motor flange for attaching to the first motor, the first motor flange
A second motor flange disposed at a predetermined distance from the first flange, and a cylindrical stator frame disposed between the first and second motor flanges. -Having a case, fastening a stator to the stator frame by shrink fitting, and tightening a tie rod disposed between the first motor flange and the second motor flange; Accordingly, the stator is sandwiched between the first motor flange and the second motor flange.

[0016]

Embodiments of the present invention will be described below in detail with reference to the drawings. FIG. 1 is a sectional view of a motor according to an embodiment of the present invention.

The motor 1 has a dish-shaped first motor flange 4 to be attached to the toggle support 12, and a dish-shaped second motor flange 4 arranged at a predetermined distance from the first motor flange 4.
A motor casing comprising a motor flange, and a tubular stator frame disposed between the first motor flange and the second motor flange; Bamboo
A hollow output shaft 8 is rotatably supported by the motor.

For this purpose, the rear end (left end in FIG. 1) of the output shaft 8 is moved forward by the thrust bearing 9 (FIG. 1).
(The right end in FIG. 3) is rotatably supported by the thrust bearing 10 in the thrust direction and the radial direction. Then, in order to rotate the output shaft 8, the stator 3 is fixed to the stator frame 6 by shrink fitting, and the rotor 2 is fixed to the output shaft 8, respectively. The coil 3a is disposed on the heater 3. The first mode
A tie rod 7 is disposed between the flange 4 and the second motor flange 5. By tightening the tie rod 7, the stator 3 is sandwiched between the first motor flange 4 and the second motor flange 5. be able to.

A fixing nut 81 is screwed to the rear end of the output shaft 8, and the ball nut 5 is screwed to the front end of the output shaft 8.
1 is fixed by bolts 53. Therefore, by fastening the fixing nut 81, the thrust bearings 9 and 10 can be sandwiched and fixed while applying a preload thereto. Further, a ball screw shaft 52 is provided so as to be screwed with the ball nut 51 and penetrate the output shaft 8, and a cross head (not shown) is fixed to a tip of the ball screw shaft 52. The crosshead is prevented from rotating.

Accordingly, when a current is supplied to the coil 3a, the rotor 2 is rotated, and the rotation is transmitted to the ball nut 51 via the output shaft 8. As a result, the rotational movement of the ball nut 51 in the direction of arrow A is performed by the screwing of the ball nut 51 and the ball screw shaft 52.
Is converted into a linear motion in the direction of arrow B of the
The screw shaft 52 and the crosshead are advanced and retracted by the stroke Sb. That is, when the crosshead is advanced, the toggle mechanism is extended, the movable platen is advanced, and the mold is closed and clamped.
Is retracted, the toggle mechanism is bent, the movable platen is retracted, and the mold is opened.

As described above, in the present embodiment, the cylindrical stator frame 6 is fixed to the stator 3 by shrink fitting, and the first motor flange 4 and the second motor flange on both sides are fixed. 5 and fixed by the tie rods 7, the motor can be changed by changing the length L of the stator frame, the stator and the roller (the motor thickness). The capacity can be changed. That is, the first and second motor flanges before and after can be made common, and only the length L of the interposed stator frame, the stator and the rotor is changed. The capacity of the data can be changed.

[0022]

According to the present invention, a tubular stator is provided.
When the motor capacity is to be changed, the motor flanges on both sides are left as they are.ゝ It can be used by changing the cylindrical stator frame, the rotor and the stator.
Changing the motor capacity is greatly facilitated.

[Brief description of the drawings]

FIG. 1 is a sectional view of a motor according to an embodiment of the present invention.

FIG. 2 is a front view of a conventional mold clamping device.

FIG. 3 is a side view of FIG. 2;

FIG. 4 is a detailed view of the servomotor of FIG. 2;

[Explanation of symbols]

Reference Signs List 1 motor 2 rotor 3 stator 4 first motor flange 5 second motor flange 6 starter free
7 Tie rod 8 Output shaft 9 Thrust bearing 10 Thrust bearing 11 Movable platen 12 Toggle support 13 Tie bar 14 Toggle mechanism 15 Drive 16 Toggle lever 17 Arm 18 Ball screw shaft 19 Nut 20 Cross head 21 Toggle lever 22 Bolt 23 Drive case 24 Servo motor 25 Rotating sleeve 26 Side wall 25a Large diameter section 25b Small diameter section 27 Side wall 28 Cylindrical cover 29 Stator core 30 Rotor core 31 Bearing 32 Ball screw nut 33 bolt

Claims (1)

[Claims] 1. A fixed platen and (b) a toggle support.
And (c) a movable platen that is disposed opposite to the fixed platen so as to be able to advance and retreat along the tie bar, and (d) that is disposed between the movable platen and the toggle support. A toggle mechanism for moving back and forth, and (e) the toggle support
A motor disposed on the rear end face of the motor, and (f) a rotor of the motor.
A hollow output shaft fixed to the output shaft, (g) a ball nut fixed to the output shaft, and (h) screwed with the ball nut, and the inside of the output shaft is rotated with the rotation of the ball nut. And (i) a cross-head fixed to the ball screw shaft and connected to the toggle mechanism, wherein the cross-head is attached to the toggle support. A first motor flange, a second motor flange disposed at a predetermined distance from the first motor flange, and a cylinder disposed between the first and second motor flanges A motor case comprising a stator frame having a shape like a letter, a stator is fixed to the stator frame by shrink fitting, and the first motor flange and the second motor flange are fixed to each other. By tightening the tie rods located between Other first mode - Tafuranji a second mode - for the mold clamping device, characterized in that the the sandwich by the Tafuranji motor - motor.