JP2001269974A - Injection equipment of injection molding machine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent axial downward dislocation caused by the deadweight of a moving plate, a motor, and a belt pulley. SOLUTION: An injection screw shaft 10 is attached on one side, a motor 12 and a belt pulley 14 rotating the injection screw shaft 10 are installed at the upper part, and a ball screw nut 22 and a ball screw shaft 20 screwed in the nut are installed at the other side respectively, Further, a linear guide 38 constituted of a housing 34 attached to the moving plate and rails 36 which are extended parallel to the axial direction of the tie bar 18 to guide the movement of the housing 34 is attached in the lower part of the moving plate 16 slid ably attached to the tie bar 18 prepared in parallel with the injection screw shaft 10.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an injection device for an injection molding machine using a ball screw as an injection mechanism.

[0002]

2. Description of the Related Art Injection devices of conventional injection molding machines include:
Some are shown in FIG. In this example, a moving plate 16 is slidably mounted on a tie bar 18 provided in parallel with the injection screw shaft 10. The injection screw shaft 10 is mounted on one side of the moving plate 16, and a ball screw nut 22 screwed to the ball screw shaft 20 is mounted on the other side in parallel with the injection screw shaft 10. Further, the moving plate 16 is provided with a drive motor 12 which is a rotation driving means for rotatingly driving the injection screw shaft 10 and a belt pulley 14. The combination of the ball screw nut 22 and the ball screw shaft 20 converts the rotational motion of the ball screw shaft 20 into a linear motion to move the moving plate 16 in the axial direction of the injection screw shaft 10. One end of the ball screw shaft 20 is supported by a first fixed plate 28 provided with a drive motor 24 capable of driving the ball screw shaft 20 to rotate and a belt pulley 26.
One end of the tie bar 18 is attached to the first fixing plate 28, and the other end of the tie bar 18 is connected to the second fixing plate 3.
0 is attached. A cylinder 32 into which one end of the injection screw shaft 10 is inserted is mounted on the second fixed plate 30 concentrically with the injection screw shaft 10.

Next, the operation will be described. During the injection process, the drive motor 24 rotates, and this rotation is transmitted to the ball screw shaft 20 via the belt pulley 26. The rotational movement of the ball screw shaft 20 is transmitted to the ball screw nut 22. Since the ball screw nut 22 is attached to the moving plate 16 and the rotational movement is restrained, the ball screw nut 22, the moving plate 16 and the injection screw shaft 10 are connected to the tie bar. A linear motion, that is, a leftward movement in FIG. As a result, the injection screw shaft 10 moves into the cylinder 32, and injection is performed. In the plasticizing and suck-back steps, the movement direction is opposite, but the movement is the same as in the injection step.

[0004]

However, in the injection device of the conventional injection molding machine, the moving plate 16 is supported by the tie bar 18 bridged between the first fixed plate 28 and the second fixed plate 30. Only
Since the bottom of the movable plate 16 is not grounded and the plasticizing drive motor 12 and the belt pulley 14 are attached to the movable plate 16, the movable plate 1
6. The plasticizing drive motor 12 and the belt pulley 14 are suspended in the air.
Will receive it. Therefore, as shown in FIG. 4, the movable plate 16 is displaced downward by the amount of deflection Y of the tie bar 18 due to its own weight. When the moving plate 16 is misaligned, the injection screw shaft 10 and the ball screw nut 22 connected to the moving plate 16 also cause misalignment and inclination.
There is a possibility that the inner surface may be galled or the life of the ball screw nut 22 and the ball screw shaft 20 may be shortened. The present invention has been made to solve such a problem, and provides an injection device of an injection molding machine capable of preventing deflection of a moving plate and moving the moving plate on a tie bar without misalignment. The purpose is to:

[0005]

In order to achieve the above object, according to the first aspect of the present invention, a tie bar (1) provided in parallel with an injection screw shaft (10) is provided.
A movable plate (16) is slidably mounted on 8), an injection screw shaft (10) is mounted on one side of the movable plate (16), and a ball screw shaft (20) is mounted on the other side. A ball screw nut (22) screwed in is mounted in parallel with the injection screw shaft (10), and rotation driving means (12, 14) for driving the injection screw shaft (10) to rotate on the moving plate (16). The movable plate (16) is converted into a linear motion by the combination of the ball screw nut (22) and the ball screw shaft (20), and the movable plate (16) is moved to the injection screw shaft (1).
In an injection device of an injection molding machine that is moved in the axial direction of (0), a linear guide (3) that moves parallel to the axial direction of the tie bar (18) is provided below the moving plate (16).
8) is attached. Here, the rotation drive means (12, 14) are a drive motor and a belt pulley.

According to a second aspect of the present invention, in the first aspect, the moving plate (1) is provided.
A height adjusting mechanism (42) capable of moving up and down the moving plate (16) is provided between the lower part of (6) and the linear guide (38).

According to a third aspect of the present invention, in the first or second aspect, the plurality of linear guides (38) and / or the height adjusting mechanism (42) are provided with the movable plate (16). Is provided at the lower part of According to a fourth aspect of the present invention, in the second aspect, the height adjusting mechanism (4) is provided.
2) a fixing member (44) whose upper part is attached to the lower part of the moving plate (16) and whose lower part is inclined, and whose upper part is in contact with the lower part of the fixing member (44) and is fixed. A moving member (46) which is inclined in a direction opposite to the inclination direction of the member (44), and a lower portion of which is attached to an upper portion of the housing (34) which is slidable in the moving direction.
And an adjusting means (48) capable of moving the moving member (46) to a predetermined position. In addition, the code | symbol in said parenthesis shows the corresponding member of embodiment mentioned later.

[0008]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 is a side view showing a part of an injection device of an injection molding machine according to a first embodiment of the present invention. In addition, description is abbreviate | omitted about the part demonstrated in the prior art, and the same code | symbol is used about each member.

A linear guide 38 is provided at a lower portion of the moving plate 16. The linear guide 38 is connected to a housing 34 mounted at a lower portion of the moving plate 16 and a housing 34 via a rollable ball (not shown). And a rail 36 for guiding the movement of the vehicle. The rail 36 is fixed to the base 40 so as to extend parallel to the axial direction of the tie bar 18, whereby the housing 3
4 is guided to move in the axial direction of the tie bar 18.
The linear guide 38 has a size such that the center of the moving plate 16 is at the same height position as the axis of the cylinder 32 which is the machine core.

Next, the operation will be described. Drive motor 2
4, the rotation is transmitted to the ball screw shaft 20 via the belt pulley 26, and the ball screw nut 22, the moving plate 16 and the injection screw shaft 10 are guided by the tie bar 18 and linearly move. At this time, since the housing 34 moves on the rail 36 integrally with the moving plate 16,
When the moving plate 16 moves, the lower portion thereof is supported by the linear guide 38, and the downward movement of the moving plate 16 is restricted. Thereby, the moving plate 16 can perform a linear motion while maintaining the concentricity with the axis of the cylinder 32. Therefore, the injection screw shaft 10 and the ball screw nut 22 also maintain concentricity or parallel with the axis of the cylinder 32. The linear motion is performed in the state.

Next, FIG. 2 shows a second embodiment.

In the first embodiment, two housings 34 of the linear guide 38 are provided before and after the moving direction of the moving plate 16 at the center in the left and right direction (the rail 36 and the housing 34 are arranged in accordance with the size and shape of the moving plate 16). And a height adjusting mechanism 42 capable of moving the moving plate 16 up and down between each housing 34 and the moving plate 16. Height adjustment mechanism 4
2 is a fixed member 44 whose upper part is attached to the lower part of the moving plate 16 and whose lower height position is inclined in the moving direction of the moving plate 16 (left and right direction in the figure);
The upper part is in contact with the lower part of the fixing member 44, and is inclined in a direction opposite to the inclination direction of the fixing member 44, and the lower part is attached to the upper part of the housing 34 so as to be movable in the left-right direction. The moving member 46 is screwed.
And an adjustment bolt 48 that can be moved in the inclination direction. In the present embodiment, the fixed member 44 and the moving member 4
Although the direction of inclination of 6 is the direction of movement of the moving plate 16, the direction of inclination is not limited to the direction of movement depending on where the height adjustment mechanism 42 is attached.

Next, the operation will be described. When the adjusting bolt 48 is screwed and rotated, the moving member 46 moves in the inclined direction, and the position in the left-right direction where the upper part of the moving member 46 and the lower part of the fixed member 44 contact each other changes. As a result, the fixing member 44 moves up and down integrally with the moving plate 16. By adjusting the front and rear height adjusting mechanisms 42, the height position between the center of the moving plate 16 and the axis of the cylinder 32 is matched. Can be.

In the above-described embodiment, the height adjusting mechanism 42 is provided at two positions in the front and rear directions of movement of the moving plate 16 in the left-right center. However, the present invention is not limited to this. May be provided at two places on the left and right, four places on the front, rear, left and right (in this case, two rails 36 are provided on the left and right of the moving plate 16), or more may be provided as necessary. Thereby, the moving plate 16
Can be prevented from falling back and forth, and the height can be stably held.

In the above embodiment, the linear guide 38 and the height adjusting mechanism 42 are separate members, but the invention is not limited to this. The linear guide 38 itself is provided with a height adjusting mechanism. May be used.

[0017]

As described above, according to the first aspect of the present invention, since the lower portion of the movable plate (16) is supported by the linear guide (38), the movable plate (16) is moved. In the middle, the moving plate (1) by its own weight of the moving plate (16) and the rotation
6) The bending of the moving plate (16) is prevented, and the linear motion can be performed with the center of the moving plate (16) maintained concentric with the axis of the cylinder (32).

Further, since the movable plate (16) can perform linear motion while maintaining concentricity with the machine core, the injection screw shaft (10) and the ball screw nut (22) are not eccentric, so that the injection screw shaft (10) Of the ball screw nut (22) and the life of the ball screw shaft (20) can be prevented.

Further, by preventing the misalignment of the moving plate (16) downward, the moving plate (1) is prevented.
6) The bending load on the tie bar (18) due to its own weight is reduced.

According to a second aspect of the present invention, the center of the movable plate (16) and the cylinder are adjusted by adjusting the height position of the movable plate (16) by the height adjusting mechanism (42). The axis with (32) can be more precisely matched.

According to a third aspect of the present invention, the moving plate (16) is large and the housing (34) of one linear guide (38) and the height adjusting mechanism (4) are provided.
In the case where it cannot be supported by 2), for example, the housing (3) of the linear guide (38) at two positions in front and rear or left and right of the moving plate (16), four positions in front and rear and left and right or more
By mounting the height adjusting mechanism (4) and the height adjusting mechanism (42), the height position of the moving plate (16) can be adjusted from various angles. Displacement can be prevented and stable holding can be achieved.

According to a fourth aspect of the present invention, the height adjusting mechanism (42) comprises a fixed member (44), a moving member (46), and an adjusting means (48). Therefore, when the adjusting means (48) is screwed and rotated, the moving member (46) moves, and the position where the upper part of the moving member (46) contacts the lower part of the fixed member (44) changes. The fixing member (44) is a moving plate (16).
As a result, the height of the center of the moving plate (16) and the axis of the cylinder (32) can be matched, and the center of the moving plate (16) can be prevented from being misaligned.

[Brief description of the drawings]

FIG. 1 is a side view showing a part of an injection device of an injection molding machine according to a first embodiment.

FIG. 2 is a side view showing a part of an injection device of an injection molding machine according to a second embodiment.

FIG. 3 is a side view showing an injection device of a conventional injection molding machine.

FIG. 4 is an enlarged sectional view of a portion A in FIG. 3;

[Explanation of symbols]

 Reference Signs List 10 injection screw shaft 12 motor 14 belt pulley 16 moving plate 18 tie bar 20 ball screw shaft 22 ball screw nut 34 housing 36 rail 38 linear guide 44 fixing member 46 moving member 48 adjusting means

Claims (4)

[Claims] 1. A movable plate (16) is slidably mounted on a tie bar (18) provided in parallel with an injection screw shaft (10), and the movable plate (16) has an injection port on one side. A screw shaft (10) is mounted, and a ball screw nut (22) screwed to a ball screw shaft (20) is mounted on the other side in parallel with the injection screw shaft (10). Injection screw shaft (1
0) is provided, and the rotational motion of the ball screw shaft (20) is converted into a linear motion by a combination of the ball screw nut (22) and the ball screw shaft (20). In an injection device of an injection molding machine configured to move a plate (16) in an axial direction of an injection screw shaft (10), a linear member that moves parallel to an axial direction of a tie bar (18) is provided below a moving plate (16). An injection device for an injection molding machine, comprising a guide (38). 2. A height adjusting mechanism (42) capable of moving up and down the moving plate (16) is provided between a lower portion of the moving plate (16) and the linear guide (38). Item 2. An injection device for an injection molding machine according to Item 1. 3. The injection molding machine according to claim 1, wherein a plurality of linear guides (38) and / or a height adjusting mechanism (42) are provided below the moving plate (16). Injection equipment. 4. A fixing member (44) having an upper portion attached to a lower portion of the moving plate (16) and having an inclined lower height position, and a fixing member (44) having an upper portion. ) In contact with the bottom of
The fixing member (44) is inclined in the opposite direction to the inclination direction,
A moving member (46) attached to an upper portion of a housing (34) whose lower part is slidable; and adjusting means (4) capable of moving the moving member (46) to a predetermined position.
The injection device of an injection molding machine according to claim 2 or 3, wherein the injection device comprises: