JP2000263604A - Injection molding machine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve assembling operability simply with a few number of components and to reduce a cost by mounting both ends of a pair of guide bars at predetermined two corners of two opposed holding blocks in an opposed positional relationship, inserting and guiding a moving element into the bars. SOLUTION: A heating cylinder holding block 5 and an axially driving means holding block 6 are oppositely disposed at a predetermined interval. Two guide bars 9, 10 are arranged so that corners of lower portions of two holding blocks 5, 6 at front surface sides and corners of upper portions of the blocks 5, 6 at a depth side are respectively connected to each other, and both ends of the bars 9, 10 are respectively fixed to the two blocks 5, 6. Two wings 11a of the element 1 are inserted into and held at the bars 9, 10 through a slide block 12. In this case, the element 11 is guided by the two bars 9, 10 to be slidable longitudinally in an axial direction of a screw to simply improve assembling operability and to reduce a cost.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an in-line screw type injection molding machine, and more particularly to a guide mechanism for a moving body which moves forward and backward integrally with a screw.

[0002]

2. Description of the Related Art In an in-line screw type injection molding machine using an electric servomotor as a drive source, a screw is rotated by rotation of a screw rotation servomotor, and the screw is driven in an axial direction by rotation of the injection servomotor. It has become. The rotation of the injection servomotor is converted to linear motion by a rotation → linear motion conversion mechanism using a ball screw mechanism and transmitted to a moving body that moves forward and backward with the screw, and the moving body is arranged parallel to the screw shaft. The guide bar is inserted and guided by the four guide bars and moves together with the screw.

The above-mentioned guide bar is provided between a heating cylinder holding block holding the rear end side of the heating cylinder and an axial driving means holding block rotatably holding a rotating body of a rotation → linear motion conversion mechanism. Has been passed over,
Along with guiding the forward and backward movement of the moving body, the moving body also functions as a tie bar for receiving a reaction force of the axial propulsion applied to the moving body. In a conventional injection molding machine, ends of guide bars are respectively attached to four corners of the heating cylinder holding block and the axial driving means holding block, and four guide bars are attached to four guide bars. The wings were configured to be inserted and guided, respectively. The reason why the four guide bars are used to guide the moving body is that the reaction force of the axial propulsion applied to the moving body is dispersed and received by the four guide bars, and the like. It is.

[0004]

As described above, in the conventional injection molding machine, four guide bars are used to guide the moving body moving forward and backward together with the screw, and the axial propulsion applied to the moving body is performed. Although the reaction force of the force is distributed and received by the four guide bars, the above reaction force is much smaller than the force received by the tie bar in the mold opening and closing mechanism, and from the viewpoint of safety of mechanical strength. Looking at it,
It is pointed out that the quality is excessive. Since the four guide bars are provided, there are the following problems.

(1) When it is desired to change the diameter of the pulley for transmitting rotation to the screw attached to the moving body (when changing the transmission torque), it is necessary to replace the pulley. Since the guide bar hinders the pulley replacement, a specific guide bar must be removed / attached each time the pulley is replaced, and the workability of pulley replacement is poor.

(2) Since there are four guide bars, the number of parts is large, so that the number of mounting points of the guide bar and the number of mounting locations of the sliding bush between the guide bar and the moving body are increased. It is a factor that hinders the improvement of the performance.
Further, since the lengths of the four guide bars must all be uniform, the work of combining and selecting the four guide bars becomes complicated. Therefore, it generally causes a cost increase.

(3) For the purpose of penetrating the moving body through the four guide bars, it is necessary to project and form four wings from the moving body, which increases the weight of the moving body and increases the weight of the moving body. Inhibits weight reduction.

[0008] The present invention has been made in view of the above points,
It is an object of the present invention to improve the assembly workability and reduce the cost by making the guide mechanism of the moving body that moves back and forth integrally with the screw simple with a small number of parts. Another object of the present invention is to facilitate replacement of a pulley attached to a moving body. Another object of the present invention is to reduce the weight of a moving body.

[0009]

According to the present invention, for example, a diagonal position of two holding blocks (a heating cylinder holding block and an axial driving means holding block) which are erected to face each other. Both ends of a pair of guide bars are respectively attached to predetermined two corner portions having a relationship, and the moving body is inserted and guided by the two guide bars.

[0010]

Embodiments of the present invention will be described below with reference to the drawings. 1 and 2 relate to an injection molding machine according to an embodiment of the present invention. FIG. 1 is a cross-sectional front view of an injection mechanism of the injection molding machine, and FIG. 2 is a right side view of the injection mechanism of the injection molding machine. .

1 and 2, reference numeral 1 denotes a base board on which an injection mechanism and a mold opening / closing mechanism (not shown) are mounted.
Is a mounting plate of an injection mechanism, 3 and 4 are supporting stands integrally provided on the mounting plate 2, 5 is a heating cylinder holding block erected on the supporting base 3, and 6 is a supporting base An axial drive means holding block erected on 4;
Reference numeral 7 denotes a heating cylinder whose rear end is held by the heating cylinder holding block 5, and reference numeral 8 denotes a screw disposed inside the heating cylinder 7 so as to be able to rotate and move back and forth.

The heating cylinder holding block 5 and the axial driving means holding block 6 are opposed to each other with a predetermined space therebetween, and as shown in FIG. And two guide bars 9 and 10 are provided so as to connect the corners of the two and the upper corners on the back side of the two holding blocks 5 and 6, respectively. Are fixed to the two holding blocks 5 and 6, respectively.

The two guide bars 9 and 10 have two wings 11a of a moving body 11 inserted and held through a sliding bush 12, and the moving body 11 is connected to the two guide bars 9 and 10. , And is slidable back and forth in the screw axis direction.

A rotating body 13 to which the rear end of the screw 8 is fixed is rotatably held by the moving body 11, and a pulley 14 is fixed to the rotating body 13. 11b is a motor holding unit provided on the moving body 11,
A servo motor 15 for screw rotation is attached to the motor holding portion 11b. The rotation of the servo motor 15 is controlled by the output pulley 16 and the timing belt 17.
Is transmitted to the pulley 14, whereby the rotating body 13 and the screw 8 are driven to rotate.

The axial driving means holding block 6 includes:
A nut body 18 of a rotation → linear motion conversion mechanism composed of a ball nut mechanism is rotatably held, and a ball screw shaft 19 screwed to the nut body 18 is connected to the connecting body 2.
0 to the moving body 11. A pulley 21 is fixed to the nut body 18.

As shown in FIG. 2, a motor holding portion 6a is provided on the back side of the axial driving means holding block 6, and a servo motor 22 for screw forward and backward movement is mounted on the motor holding portion 6a. Have been. Then, the rotation of the servo motor 22 is transmitted to the nut body 18 via the output pulley 23, the timing belt 24, and the pulley 21, whereby the rotation of the nut body 18 is converted into a linear motion, and the ball screw shaft 19 is rotated. The moving body 11 and members mounted or connected to the moving body 11 (the rotating body 13, the screw 8, the pulley 14, the servomotor 15) are driven in the axial direction.
) Are driven in the axial direction.

As described above, in the present embodiment, the moving body 11 that moves back and forth in
The number of guide bars to guide is set to two, half of the conventional,
In addition, since the guide bar 9 on the near side, which is arranged diagonally, is set at a low position, there are the following advantages.

(1) When the pulley 14 attached to the moving body 11 is replaced, the guide bar does not hinder the pulley 14 from being taken in and out from the front side of the machine. Each time you exchange,
There is no need to remove / attach the guide bar,
Workability of pulley replacement is improved.

(2) The number of guide bars is 2 which is half of the conventional one.
Since this is a book, the number of parts can be reduced, and the number of mounting points of the guide bar and the number of mounting points of the sliding bush between the guide bar and the moving body are also reduced. Down becomes possible.

(3) Since the number of wings of the moving body 11 to be inserted into the guide bar can be reduced to half of the conventional one, the weight of the moving body 11 can be reduced.

[0021]

As described above, according to the present invention, a guide mechanism for a moving body that moves back and forth integrally with a screw can be simplified with a small number of parts, thereby improving assembly workability and cost. Down can be planned. Further, the work of replacing the pulley to be attached to the moving body is facilitated. Further, the weight of the moving body can be reduced.

[Brief description of the drawings]

FIG. 1 is a sectional front view of an injection system mechanism of an injection molding machine according to one embodiment of the present invention.

FIG. 2 is a right side view of an injection system mechanism of the injection molding machine according to one embodiment of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Base board 5 Heating cylinder holding block 6 Axial driving means holding block 7 Heating cylinder 8 Screw 9, 10 Guide bar 11 Moving body 13 Rotary body 14 Pulley 15 Screw rotation servomotor 18 Nut body 19 Ball screw shaft 21 Pulley 22 Screw Forward / backward servo motor

Claims (3)

[Claims] 1. A screw disposed in a heating cylinder so as to be capable of rotating and moving forward and backward, and a rotatable body integrally fixed to a rear end of the screw is rotatably held and is capable of moving forward and backward. A moving body held as such, a screw rotation driving means for rotating and driving the rotating body, and an injection molding machine including a screw forward and backward driving means for moving the moving body back and forth, The two ends of a pair of guide bar members are respectively attached to predetermined two corners in a diagonal positional relationship between the two standing holding blocks, and the moving body is inserted into the two guide bar members. An injection molding machine wherein the movable body slides on the guide bar member. 2. The two guide bar members according to claim 1, wherein the two guide bar members have lower corners on the front side of the two holding blocks and upper upper corners on the back side of the two holding blocks. An injection molding machine characterized by being arranged so as to connect each other. 3. The holding block according to claim 1, wherein one of the two holding blocks is a holding block that holds a rear end side of the heating cylinder, and the other of the two holding blocks is a screw that moves back and forth. An injection molding machine characterized in that it is a holding block which supports a rotating body of a rotation-to-linear motion conversion mechanism of a driving means.