JP3980806B2 - Injection machine for injection molding machine - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to an injection apparatus for an injection molding machine using a ball screw as an injection mechanism.
[0002]
[Prior art]
As an injection device of a conventional injection molding machine, there is one shown in FIG.
In this example, the moving plate 16 is slidably attached to a tie bar 18 provided in parallel with the injection screw shaft 10. An injection screw shaft 10 is attached to one side of the moving plate 16, and a ball screw nut 22 screwed to the ball screw shaft 20 is attached in parallel to the injection screw shaft 10 on the other side. Further, the moving plate 16 is provided with a drive motor 12 and a belt pulley 14 which are rotational drive means for rotationally driving the injection screw shaft 10.
The rotational movement of the ball screw shaft 20 is converted into a linear motion by the combination of the ball screw nut 22 and the ball screw shaft 20, and the moving plate 16 is moved 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 and a belt pulley 26 that can rotationally drive the ball screw shaft 20. One end of the tie bar 18 is attached to the first fixed plate 28, and the other end of the tie bar 18 is attached to the second fixed plate 30. A cylinder 32 into which one end of the injection screw shaft 10 is inserted is attached to the second fixed plate 30 concentrically with the injection screw shaft 10.
[0003]
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 motion of the ball screw shaft 20 is transmitted to the ball screw nut 22, but since the ball screw nut 22 is attached to the moving plate 16 and the rotational motion is restricted, the ball screw nut 22, the moving plate 16, and the injection screw shaft 10 are tie bars. It is guided by 18 and moves linearly, that is, in the left direction in the figure. Thereby, the injection screw shaft 10 moves into the cylinder 32 and injection is performed. The movement direction is the same in the plasticizing and sucking back process, but the movement is the same as in the injection process.
[0004]
[Problems to be solved by the invention]
However, in the injection device of the conventional injection molding machine, the moving plate 16 is only supported by the tie bar 18 spanned between the first fixed plate 28 and the second fixed plate 30. Is not grounded, and the plasticizing drive motor 12 and the belt pulley 14 are attached to the moving plate 16, so the moving plate 16, the plasticizing drive motor 12 and the belt pulley 14 are in the air. The tie bar 18 receives all of its own weight. For this reason, as shown in FIG. 4, the movable plate 16 is misaligned downward by the deflection amount Y of the tie bar 18 due to the weight of the member. When the moving plate 16 is misaligned, the injection screw shaft 10 and the ball screw nut 22 coupled to the moving plate 16 are also misaligned and tilted. May induce a decrease in lifespan.
The present invention is intended to solve such problems, and provides an injection apparatus for an injection molding machine that can prevent deflection of the moving plate and move the moving plate on the tie bar without misalignment. For the purpose.
[0005]
[Means for Solving the Problems]
In order to achieve the above-mentioned object, the moving plate (16) is slidably attached to a tie bar (18) provided parallel to the injection screw shaft (10). And
An injection screw shaft (10) is attached to one side of the moving plate (16), and a ball screw nut (22) screwed to the ball screw shaft (20) is connected to the injection screw shaft (10) on the other side. Rotation drive means (12, 14) that is mounted in parallel and rotationally drives the injection screw shaft (10) is provided on the moving plate (16), and a combination of a ball screw nut (22) and a ball screw shaft (20). In the injection apparatus of the injection molding machine, the rotational movement of the ball screw shaft (20) is converted into a linear motion by moving the moving plate (16) in the axial direction of the injection screw shaft (10).
A linear guide (38) that moves parallel to the axial direction of the tie bar (18) is provided at the lower part of the moving plate (16), and the upper part of the linear guide (38) is in relation to the linear guide (38). A slidable housing (34) is provided;
Between the lower part of the moving plate (16) and the linear guide (38), a height adjusting mechanism (42) capable of moving the moving plate (16) up and down is provided.
The height adjusting mechanism (42) has a fixing member (44) whose upper part is attached to the lower part of the movable plate (16) and whose lower surface is inclined, and whose upper surface is in contact with the lower surface of the fixing member (44). A movable member (46) that is in contact with and is inclined in the same direction as the inclination direction of the fixed member (44), the lower part is attached to the upper part of the housing (34), and is movable in the horizontal direction; 46), and adjusting means (48) for adjusting the height position of the fixing member (44) . Here, the rotation drive means (12, 14) are a drive motor and a belt pulley.
[0006]
The invention according to claim 2 is characterized in that, in the invention according to claim 1, a plurality of linear guides (38) and / or a height adjusting mechanism (42) are provided.
[0007]
In addition, the code | symbol in the said parenthesis shows the corresponding member of embodiment mentioned later.
[0008]
DETAILED DESCRIPTION OF THE INVENTION
Embodiments of the present invention will be described below with reference to the drawings.
[0009]
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, while omitting the description of the portions overlapping with those described in the prior art, the same reference numerals are used for the respective members.
[0010]
A linear guide 38 is provided at the lower part of the moving plate 16. The linear guide 38 moves the housing 34 via a housing 34 attached to the lower part of the moving plate 16 and a rollable ball (not shown). It is comprised from the rail 36 to guide. The rail 36 is fixed to the base 40 so as to extend parallel to the axial direction of the tie bar 18, thereby guiding the housing 34 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 as the axis of the cylinder 32 that is the machine core.
[0011]
Next, the operation will be described. The drive motor 24 is driven, and this 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, the lower portion of the moving plate 16 is supported by the linear guide 38 when moving, and the moving plate 16 is moved downwardly. Movement is restricted. Thereby, since the moving plate 16 can perform linear motion while maintaining the concentricity with the axis of the cylinder 32, the injection screw shaft 10 and the ball screw nut 22 also maintain concentricity or parallel with the axial center of the cylinder 32. A linear motion is performed in the state.
[0012]
Next, FIG. 2 shows a second embodiment.
[0013]
This is because two housings 34 of the linear guide 38 of the first embodiment are provided in the front and rear of the moving plate 16 in the left-right center direction (1 each of the rail 36 and the housing 34 according to the size and shape of the moving plate 16). A height adjusting mechanism 42 that can move the moving plate 16 up and down is provided between each housing 34 and the moving plate 16.
Height adjusting mechanism 42, together with the upper is attached to the lower portion of the moving plate 16, the height position of the lower surface (in the figure, the horizontal direction) movement direction of the moving plate 16 and the fixed member 44 is inclined, together with the upper surface is in contact with the lower surface of the fixed member 44, and tilts toward the tilt direction and the same direction of the fixed member 44, a movable member 46 which lower part is attached to the upper portion of the movable housing 34 in the lateral direction, The moving member 46 is composed of an adjusting bolt 48 that can move in the tilt direction by screwing the bolt. In the present embodiment, the inclination direction of the fixed member 44 and the movement member 46 is the movement direction of the movement plate 16, but the inclination direction is determined by the attachment site of the height adjustment mechanism 42 , and is limited to the movement direction in particular. It is not a thing.
[0014]
Next, the operation will be described. Moving member 46 and is rotated by screwing the adjusting bolt 48 is moved in the inclined direction, abutting to the position in the lateral direction of the lower surface of the upper face of the fixed member 44 of the movable member 46 is changed. As a result, the fixed member 44 moves up and down integrally with the moving plate 16, so that the height position of the center of the moving plate 16 and the axis of the cylinder 32 can be matched by adjusting the front and rear height adjusting mechanism 42. Can do.
[0015]
In the above-described embodiment, the height adjusting mechanism 42 is provided at two positions before and after the moving direction of the left and right center of the moving plate 16. However, the present invention is not limited to this. Two places on the left and right, four places on the front and rear, right and left (in this case, two rails 36 are provided on the left and right of the moving plate 16) or more may be provided if necessary. As a result, the movable plate 16 can be prevented from being tilted back and forth and from being displaced in the left and right directions and stably held.
[0016]
In the above embodiment, the linear guide 38 and the height adjustment mechanism 42 are separate members, but the present invention is not limited to this, and the linear guide 38 itself is provided with a height adjustment mechanism. May be used.
[0017]
【The invention's effect】
As described above, according to the first aspect of the present invention, since the lower part of the moving plate (16) is supported by the linear guide (38), the moving plate (16) is moved even during the movement of the moving plate (16). 16) and the deflection of the moving plate (16) due to the weight of the rotation driving means (12, 14) is prevented, and the straight line is maintained with the center of the moving plate (16) being concentric with the axis of the cylinder (32). Can do exercise.
[0018]
Further, since the moving 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 cylinder inner surface by the injection screw shaft (10) It is possible to prevent the galling and the life reduction of the ball screw nut (22) and the ball screw shaft (20).
[0019]
Furthermore, the downward center misalignment of the moving plate (16) is prevented, thereby reducing the bending load on the tie bar (18) due to the weight of the moving plate (16).
[0020]
By adjusting the height position of the moving plate (16) with the height adjusting mechanism (42), the center of the moving plate (16) and the axial center of the cylinder (32) can be matched more precisely.
[0021]
Further, the position of the moving member (46) is moved by the adjusting means (48), and the position where the upper surface having the inclination angle of the moving member (46) and the lower surface having the inclination angle of the fixing member (44) change. As a result, the fixed member (44) moves up and down integrally with the moving plate (16), so that the height position of the center of the moving plate (16) and the axial center of the cylinder (32) can be matched. The misalignment of (16) can be prevented .
[0022]
The invention of claim 2, wherein among the present invention, when the moving plate (16) is larger so as not supported in a height adjusting mechanism (42) and the housing (34) of the one linear guide (38) For example, by attaching the housing (34) and the height adjustment mechanism (42) of the linear guide (38) at two places on the moving plate (16), front and rear, left and right, four places on the front and rear, left and right, or more. Since the height position of (16) can be adjusted from various angles, it is possible to prevent the movable plate (16) from falling back and forth or from shifting to the left and right, and to be held stably .
[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.
4 is an enlarged cross-sectional view of a portion A in FIG.
[Explanation of symbols]
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 (2)

A movable plate (16) is slidably attached to a tie bar (18) provided parallel to the injection screw shaft (10),
An injection screw shaft (10) is attached to one side of the moving plate (16), and a ball screw nut (22) screwed to the ball screw shaft (20) is connected to the injection screw shaft (10) on the other side. Rotation drive means (12, 14) that is mounted in parallel and rotationally drives the injection screw shaft (10) is provided on the moving plate (16), and a combination of a ball screw nut (22) and a ball screw shaft (20). In the injection apparatus of the injection molding machine, the rotational movement of the ball screw shaft (20) is converted into a linear motion by moving the moving plate (16) in the axial direction of the injection screw shaft (10).
A linear guide (38) that moves parallel to the axial direction of the tie bar (18) is provided at the lower part of the moving plate (16), and the upper part of the linear guide (38) is in relation to the linear guide (38). A slidable housing (34) is provided;
Between the lower part of the moving plate (16) and the linear guide (38), a height adjusting mechanism (42) capable of moving the moving plate (16) up and down is provided.
The height adjusting mechanism (42) has a fixing member (44) whose upper part is attached to the lower part of the movable plate (16) and whose lower surface is inclined, and whose upper surface is in contact with the lower surface of the fixing member (44). A movable member (46) that is in contact with and is inclined in the same direction as the inclination direction of the fixed member (44), the lower part is attached to the upper part of the housing (34), and is movable in the horizontal direction; 46) An injection apparatus for an injection molding machine, characterized by comprising adjustment means (48) for adjusting the height position of the fixing member (44) by moving 46) . A plurality of linear guides (38) or / and the height adjusting mechanism (42) injection unit for an injection molding machine according to claim 1, wherein the is provided.

Images