JP3199363B2 - Soundproofing device for ball screw and scattering prevention device for grease mist in mold clamping device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a soundproof device for a ball screw and a device for preventing scattering of grease mist in a mold clamping device.

[0002]

2. Description of the Related Art Conventionally, in an injection molding machine, a resin heated and melted in a heating cylinder is filled at a high pressure into a cavity space of a mold apparatus, and the resin is cooled and solidified in the cavity space. A molded article is formed by the method.

[0003] For this purpose, the mold apparatus comprises a fixed mold and a movable mold. The movable mold is moved forward and backward by a toggle mechanism, and is moved toward and away from the fixed mold, thereby closing and closing the mold. And the mold can be opened. The toggle mechanism is operated by a hydraulic cylinder, an electric motor or the like.

FIG. 1 is a schematic view of a conventional electric mold clamping device, and FIG. 2 is a side view of the conventional electric mold clamping device. In the figure, reference numeral 25 denotes a movable platen, and a movable mold (not shown) is attached to a front end (right side in FIG. 1) of the movable platen 25. The movable platen 25 is advanced and retracted along a tie bar 24 provided between a fixed platen (not shown) and the toggle support 18 by a toggle mechanism described later. The rear end of the movable platen 25 (FIG. 1)
(The left end in FIG. 1), an ejector pin feeder 16 is provided.

A toggle mechanism is provided between the toggle support 18 and the movable platen 25, and the crosshead 17 is moved between the toggle support 18 and the movable platen 25.
By moving the movable platen 25 forward and backward, the movable platen 25 is advanced (moved to the right in FIG. 1) by the mold clamping force to perform mold clamping. I can do it.

To this end, the toggle mechanism includes a toggle lever 19 swingably supported by the crosshead 17, a toggle lever 20 swingably supported by the toggle support 18, and the movable lever. A toggle arm 21 supported swingably with respect to a platen 25;
Between the two toggle levers 19 and 20, and the toggle lever-2
0 and the toggle arm 21 are respectively link-coupled.

In addition, the ball screw shaft 15 is
The ball screw shaft 15 is rotatably supported by the toggle support 18 via 5a, and the ball screw shaft 15 and a ball nut (not shown) provided inside the crosshead 17 are screwed together. In order to rotate the ball screw shaft 15, a servo motor 11 is attached to the side surface of the toggle support 18. A belt 12 is stretched between a pulley 13a of the servomotor 11 and a pulley 13b attached to the tip of the ball screw shaft 15.

Therefore, when the servo motor 11 is driven to rotate the ball screw shaft 15 in the direction of arrow A, the rotational motion of the ball screw shaft 15 is changed to the linear motion of the ball nut. After the conversion, the crosshead 17 is moved forward and backward in the direction of arrow B. That is, when the cross head 17 is advanced as shown in the upper half of FIG. 1, the toggle mechanism is extended, the movable platen 25 is advanced, and the mold is closed and the mold is clamped. When retracted as in the lower half, the toggle mechanism is bent and the movable platen 25 is retracted, and the mold is opened.

[0009]

However, in the above-mentioned conventional mold clamping device, the movable platen 25 is repeatedly moved forward and backward in order to perform molding. At this time, the ball nut disposed inside the crosshead 17 has Since it is repeatedly moved back and forth between the toggle support 18 and the movable platen 25, noise is generated from the ball nut.

[0010] A grease for lubricating the ball screw shaft is also provided.
When the oil film between the ball and groove is cut, the ball
Grease mist scatters from the part of Lunat,
This makes it difficult to use an electric injection molding machine in a clean room.

The present invention solves the above-mentioned problems of the conventional electric mold clamping device, can prevent the noise of the ball screw in the mold clamping device, and can reduce the grease mist of the injection molding machine. It is an object to prevent scattering to the surroundings.

[0012]

For this purpose, the sound-insulating device for a ball screw in a mold clamping device according to the present invention comprises:
A fixed platen, (b) a toggle support, (c) a movable platen that is disposed opposite to the fixed platen so as to be able to advance and retreat along a tie bar, and (d) a movable platen and a toggle support. A toggle mechanism for moving the movable platen forward and backward, (e) a servo motor disposed on the rear end face of the toggle support, and (f) a rotor for the servo motor. (G) a ball nut fixed to the output shaft, (h) screwed with the ball nut, and the inside of the output shaft is rotated with the rotation of the ball nut. A boat that can be moved
An electric mold clamping device having a screw shaft and (i) a crosshead fixed to the ball screw shaft and connected to the toggle mechanism, the electric mold clamping device being fixed to a front end face of the toggle support, -A plate for covering the nut
A hole having an inside diameter slightly larger than the outside diameter of the ball screw shaft is formed in the center of the ball, and the ball screw shaft is made to advance and retreat through the hole. Further, in the ball screw soundproofing device, an intake hole is formed in the plate, a piping tube is connected to the intake hole, and a suction device sucks grease mist generated from the ball nut. It is desirable to provide a grease mist scattering prevention device as described above.

[0013]

Embodiments of the present invention will be described below in detail with reference to the drawings. FIG. 3 is an external view of an electric mold clamping apparatus to which the soundproofing device and the grease mist scattering prevention device according to the present invention are applied, and FIG. 4 is a cross-sectional view of a servo motor according to the embodiment of the present invention. .

In the drawing, reference numeral 36 denotes a fixed platen, 41 denotes a toggle support, 34 denotes a tie bar provided between the fixed platen 36 and the toggle support 41, and 35 denotes a fixed platen facing the fixed platen 36. And the tie bar
The movable platen is provided so as to be able to move forward and backward along the movable platen 34, and a fixed mold (not shown) is provided on a surface of the fixed platen 36 facing the movable platen 35. A movable mold (not shown) is attached.

The rear end of the movable platen 35 (FIG. 3)
An ejector pin feeder 26 for projecting an ejector pin (not shown) at the time of release from the mold is disposed at the left end of the ejector. In the ejector pin feeder 26, an ejector rod 27 is advanced and retracted by a stroke Sa by a servo motor 32 for the ejector.

A toggle mechanism, which will be described later, is provided between the movable platen 35 and the toggle support 41 to drive the mold clamping servomotor 31 to move the crosshead 38 forward and backward. As a result, a mold clamping force multiplied by the toggle magnification is generated, and the movable platen 35 is advanced (moved to the right in FIG. 3) by the mold clamping force to perform mold clamping.

To this end, the toggle mechanism includes a toggle lever 39 swingably supported by the crosshead 38, a toggle lever 40 swingably supported by the toggle support 41, and the movable lever. A toggle arm 33 swingably supported on a platen 35;
Between the two toggle levers 39 and 40, and the toggle lever-4
The link between 0 and the toggle arm 33 is respectively linked.

Next, the servo motor 31 will be described. The servo motor 31 is provided with the toggle support 41.
Plate-shaped first flange 54 for attaching to the first flange 54, and a second plate-shaped flange disposed at a predetermined distance from the first flange 54.
A motor casing comprising a flange 55 and a cylindrical frame 62 disposed between the first flange 54 and the second flange 55, the motor casing being hollow with respect to the motor casing; The output shaft 50 is rotatably supported.

For this purpose, the rear end (the left end in FIG. 4) of the output shaft 50 is supported by a thrust bearing 57 and the front end (the right end in FIG. 4) is rotatably supported by a thrust bearing 58 in the thrust direction and the radial direction. In order to rotate the output shaft 50, a stator 61 is mounted on the frame 62, and a loader is mounted on the output shaft 50.
Each of the stators 60 is fixed, and the coil 45 is disposed on the stator 61. The first flange 54
A bolt 59 is provided between the stator 6 and the second flange 55. By tightening the bolt 59, the
1 can be sandwiched between the first flange 54 and the second flange 55.

A fixing nut 46 is screwed to the rear end of the output shaft 50, and a ball nut 51 is fixed to the front end of the output shaft 50 by a bolt 53. Therefore,
By tightening the fixing nut 46, the thrust bearings 57 and 58 can be sandwiched and fixed while preload is applied. Then, the ball screw 51 is screwed into the ball nut 51, the output shaft 50 is penetrated, and the ball screw shaft 63 is
The crosshead 38 is fixed to the tip of the ball screw shaft 63. The cross head 38 is prevented from rotating.

Therefore, when a current is supplied to the coil 45, rotation is generated in the rotor 60, and the rotation is transmitted to the ball nut 51 via the output shaft 50. As a result, the rotational movement of the ball nut 51 in the direction of arrow A is converted into the linear movement of the ball screw shaft 63 in the direction of arrow B by the screwing of the ball nut 51 and the ball screw shaft 63.
When the ball screw shaft 63 and the crosshead 38 are in the stroke S
b is advanced and retreated. That is, the crosshead 3
8, the toggle mechanism is extended, the movable platen 35 is advanced, the mold is closed and closed, and when the crosshead 38 is retracted, the toggle mechanism is bent and the movable platen 35 is retracted. The mold is opened.

Next, the soundproofing device will be described. The soundproofing device is provided on a surface (front end surface) opposite to the surface (rear end surface) of the toggle support 41 on which the servo motor 31 is mounted, and a plate 70 covering the ball nut 51 is provided. Prepared,
The plate 70 is fixed to the front end surface of the toggle support 41 by tightening a plurality of bolts 71 at the end. A hole 72 is formed in the center of the plate 70, and the ball screw shaft 63 passes through the hole 72 and moves in the direction of arrow B. The inner diameter of the hole 72 is the ball screw shaft 6
3, the space R surrounded by the first flange 54, the toggle support 41 and the plate 70 is substantially sealed, and is fixed to the output shaft 50 in the direction of arrow A. It is possible to prevent noise generated from the ball nut 51 performing a rotary motion from leaking out of the mold clamping device.

Further, an intake hole 73 is additionally formed in the plate 70, and a one-touch type pipe joint 8 is formed in the intake hole 73.
0, a piping tube 81 is connected to the pipe joint 80, and a grease mist scattering prevention device for forcibly sucking grease mist generated in the space R by a suction device 82 such as a blower. It is more effective to attach to the mold clamping device. With this device, grease mist generated from the ball nut 51 fixed in the space R can be prevented from scattering outside the mold clamping device.

It should be noted that the present invention is not limited to the above-described embodiment, but can be variously modified based on the gist of the present invention, and they are not excluded from the scope of the present invention.

[0025]

As described in detail above, according to the present invention, in the electric mold clamping device, a plate fixed to the front end surface of the toggle support and covering the ball nut is provided. A hole having an inner diameter slightly larger than the outer diameter of the ball screw shaft is formed in the center of the plate, and the ball screw shaft is advanced through the hole. Since a soundproof device for the ball screw is provided in the mold clamping device, the noise generated from the ball screw can be prevented. In the above-mentioned sound insulation device for a ball screw, an intake hole is formed in the plate, a piping tube is connected to the intake hole, and a suction device suctions grease mist generated from the ball nut. By installing a grease mist scattering prevention device for a ball screw in a mold clamping device characterized by the fact that the grease mist is greatly reduced, a food container, an optical disk, and An injection molding machine can be used in a clean room for molding a medical syringe or the like.

[Brief description of the drawings]

FIG. 1 is a schematic view of a conventional electric mold clamping device.

FIG. 2 is a side view of a conventional electric mold clamping device.

FIG. 3 is an external view of an electric mold clamping device to which the soundproofing device and the green mist scattering prevention device according to the present invention are applied.

FIG. 4 is a sectional view of a servomotor according to the embodiment of the present invention.

[Explanation of symbols]

 41 Toggle Support 51 Ball Nut 63 Ball Screw Shaft 70 Plate 72 Hole 73 Intake Hole 81 Piping Tube 82 Suction Device

Claims (2)

(57) [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 servo motor disposed on the rear end face of the motor, (f) a hollow output shaft fixed to a rotor of the servo motor, and (g) a hollow output shaft fixed to the output shaft. A ball nut, (h) a ball screw shaft which is screwed with the ball nut, and which can be moved back and forth in the output shaft with rotation of the ball nut; and (i) fixed to the ball screw shaft. An electric mold clamping device having a crosshead connected to the toggle mechanism, comprising a plate fixed to a front end surface of the toggle support and covering the ball nut, and a center of the plate. A hole having an inner diameter slightly larger than the outer diameter of the ball screw shaft is formed in the portion, and the ball screw shaft is advanced and retracted through the hole. Soundproof device for ball screw in tightening device. 2. The sound insulation device for a ball screw according to claim 1, wherein an intake hole is formed in the plate, a piping tube is connected to the intake hole, and a suction device is used to connect the ball nut to the ball nut. A grease mist generated by a ball screw in a mold clamping device, wherein the grease mist generated is sucked.