JP2000015663A - Injection molding machine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To easily and in a short time perform mounting and dismounting of a nozzle and to prevent a resin material from being leaked between the nozzle and the nozzle mounting part. SOLUTION: A projecting part 34 for hooking which is orthogonal to the axial line of a nozzle 31 and is projecting outside from this axial line is formed on the back end part 33 of the nozzle 31 and a hooking channel 41 which can receive the projecting part 34 when the nozzle 31 is moved in its axial direction and can make the nozzle 31 rotatable around the axial line under a received condition is formed at the apex part 4 of an injection unit. In addition, a hooking member 42 which hoods the front face 40 of the projecting part 34 for hooking and prevents the nozzle 31 from moving forward when the nozzle 31 is rotated in the hooking channel 41 is provided.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an injection molding machine for obtaining a resin molded product.

[0002]

2. Description of the Related Art As is well known, an injection molding machine is provided with an injection unit for supplying a resin material to a mold. This injection unit is classified into various types such as a plunger type, a plunger pre-plastic type, a screw pre-plastic type, an in-line screw type, a shear plasticizing type, and a high-pressure plasticizing type. Among them, the in-line screw type is the most excellent and occupies the mainstream in terms of machine operability, maintenance, service life, price and the like in a comprehensive manner. FIGS. 8 and 9 show examples of an injection molding machine having this in-line screw type injection unit.

Referring to FIG. 8, reference numeral 1 denotes a base, on which a support 2 is fixed, and an injection unit 3 is mounted on the upper surface of the support 2 so as to be movable in the horizontal direction. A nozzle 5 is mounted on the tip 4 of the injection unit 3, and a hopper 6 is fixed on the upper part of the injection unit 3. On the upper surface of the base 1 and on the horizontal extension, a platen 8 having a penetrating portion 7 through which the nozzle 5 is inserted is fixed.
Is fixedly mounted. A hydraulic drive device 13 including a hydraulic cylinder 11 and a piston rod 12 is provided inside the support base 2. Tip 1 of piston rod 12
4 is fixed to the platen 8 and the hydraulic cylinder 11 is fixed to the injection unit 3, respectively.
The injection unit 3 moves the injection unit 3 toward and away from the platen 8.

[0004] As shown in FIG.
A resin flow path 17 through which a resin material flows is formed, and a male screw 19 and a nozzle-side sealing surface 2 are formed at a rear end portion 18.
0 is formed. As shown in the figure, a resin supply path 24 leading to the resin flow path 17 of the nozzle 5 is formed inside the distal end portion 4, and a recess 25 for mounting the nozzle 5 is provided. The concave portion 25 includes a female screw 26 into which the male screw 19 is screwed, and a main body-side sealing surface 27 with which the nozzle-side sealing surface 20 abuts.

A screw 28 for supplying a resin material is provided in the resin supply path 24 so as to be driven to rotate about its axis. In the mold 10 of FIG. 8, a mold recess 22 with which the front end 21 of the nozzle 5 abuts, and a resin injection path 30 leading from the mold recess 22 into the mold 10 are formed.

In this injection molding machine, the injection unit 3
The supply of the resin material to the mold 10 is performed in the following manner. First, by activating the hydraulic cylinder 11 to shorten the piston rod 12, the injection unit 3 is brought closer to the platen 8 side, and the front end 21 of the nozzle 5 is brought into close contact with the mold recess 22 of the mold 10. Then, screw 28
Is rotated to supply the resin material in the hopper 6 to the resin supply path 2.
4. The resin material is supplied by flowing into the mold 10 through the resin flow path 17 and the resin injection path 30.

Next, in the injection molding machine, the nozzle 5
A method for removing and attaching the device will be described. First, when the nozzle 5 is removed, the nozzle 5 is rotated many times counterclockwise around its axis while the tip 4 is fixed. Then, the male screw 19 is removed from the female screw 26, and the nozzle 5 is removed. Next, when the nozzle 5 is attached to the tip 4, the nozzle 5 is aligned with the axis of the nozzle 5 and the axis of the tip 4, and the nozzle-side sealing surface 20 faces the main-body-side sealing surface 27. Is rotated clockwise in the recess 25. Then, while the male screw 19 is screwed into the female screw 26, the rear end 18 of the nozzle 5 is
Entering inside. After the nozzle-side sealing surface 20 comes into contact with the main-body-side sealing surface 27, the nozzle-side sealing surface 20 and the main-body-side sealing surface 27 are tightly fitted with no gap by further tightening the nozzle 5 with a clockwise rotational torque. I do.

[0008]

In the conventional injection molding machine described above, when the nozzle 5 is mounted on the tip 4 of the injection unit 3, the nozzle-side sealing surface 20 and the body-side sealing must be tightened with sufficient torque. There is a possibility that the resin material leaks from between the surface 27. When mounting the nozzle 5, the nozzle 5 is rotated many times,
In addition, it is necessary to tighten with sufficient torque to prevent leakage of the resin material. Further, even when the nozzle 5 is removed, it is not possible to remove the tightly tightened nozzle 5 unless a large torque is applied. Have.

The present invention has been made in view of the above circumstances, and has the following objects. That is, an object of the present invention is to provide an injection molding machine that can easily and quickly install and remove a nozzle. Another object of the present invention is to prevent leakage of the resin material from between the nozzle and the nozzle mounting portion.

[0010]

The injection molding machine of the present invention comprises:
The following means are employed in order to solve the above-mentioned problems. In other words, the injection molding machine according to claim 1 is a base, an injection unit fixedly mounted on the base, and mounted on the upper surface of the support so as to be movable in the horizontal direction; A nozzle fixed to a position facing the nozzle on the base, and a platen having a penetrating portion through which the nozzle is inserted; and a nozzle fixedly mounted on the back surface of the platen. An injection molding machine comprising: a mold having an injection portion with which the front end of the nozzle abuts; and a driving device for moving the support table closer to and away from the platen. An engaging projection that is orthogonal to the axis of the nozzle and that protrudes outward from the axis is formed. At the tip of the injection unit, when the nozzle is moved in the axial direction of the nozzle, The engagement projection can be received. And, in the received state, an engagement groove is formed which enables the nozzle to rotate about the axis thereof, and further, when the nozzle is rotated in the engagement groove, the engagement protrusion is formed. An engagement member that engages with the front surface to prevent the nozzle from moving forward is provided. In the injection molding machine according to claim 1, the engagement projection of the nozzle is inserted into the engagement groove at the tip of the injection unit, and
When the nozzle is rotated in the inserted state, the front side of the engagement protrusion engages with the engagement member, and the nozzle is fixedly mounted on the tip of the injection unit.

According to a second aspect of the present invention, in the injection molding machine according to the first aspect, a front surface of the engagement protrusion and a rear surface of the engagement member engaged with the front surface rotate the nozzle. It is characterized in that the inclined surfaces are engaged with each other in a wedge shape when moved. In the injection molding machine according to claim 2, when a rotational torque is applied to the nozzle, the rotational torque generates a component force in a direction in which the engaging member presses the engaging protrusion against the engaging groove, and the nozzle is fixed. You.

According to a third aspect of the present invention, in the injection molding machine according to the first or second aspect, the engaging member is formed of a member separate from a tip of the injection unit, and a screw is attached to the tip. It is characterized in that it is attached by attaching means. In the injection molding machine according to the third aspect of the present invention, the engaging groove is formed in which the engaging protrusion of the nozzle engages by attaching the engaging member to the tip of the injection unit. Therefore,
The machining of the engagement groove is facilitated.

[0013]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, a first embodiment of the present invention will be described with reference to FIGS. 1 to 6, the same components as those in FIGS. 8 and 9 described in the conventional example are denoted by the same reference numerals, and description thereof will be omitted. In the present invention,
Since the structure for attaching the nozzle 31 to the distal end portion 4 is different from the conventional structure, this point will be described.

As shown in FIGS. 1 to 4, at the rear end portion 33 of the nozzle 31, four engaging projections 34, which are orthogonal to the axis of the nozzle 31 and project outward from the axis, are formed at equal intervals. The arrangement is formed. Further, as shown in FIG. 1, the rear end portion 33 is formed with a nozzle-side sealing surface 20 that contacts a body-side sealing surface 27 described later.

As shown in FIG. 5, when the nozzle 31 is moved in the axial direction of the nozzle 31, the engaging projection 34 of the nozzle 31 is receivable, and An engagement groove 41 is formed to enable the nozzle 31 to rotate about its axis. As shown in FIG. 1, when the nozzle 31 is rotated in the engagement groove 41, the tip portion 4 engages with the front surface 40 of the engagement protrusion 34 to move the nozzle 31 forward. Is provided.

As shown in FIG. 1 and FIG.
Is formed of a separate member from the tip 4, and includes a plurality of bolts 48 and a plurality of bolt holes 47 a formed in the tip 4.
It is attached to the distal end portion 4 by screwing means 38 made of. The reason why the engaging member 42 is a separate member is as follows.
This is for facilitating the machining of the engagement groove 41, so that complicated machining for forming the engagement groove 41 becomes unnecessary. As shown in FIG. 5, the engagement groove 41 includes a circular concave groove portion 41a and a fan-shaped concave groove portion 41b formed at four locations on the outer periphery of the concave groove portion 41a in an annular arrangement at equal intervals. . The bottom surface of the engagement groove 41 is the main body side sealing surface 2.
It is 7.

As shown in FIGS. 1 and 6, the engaging member 42
A ring-shaped plate having a rear surface 65, the nozzle 31
A through portion 44 through which the rear end portion 33 is inserted is formed.
The penetrating portion 44 is composed of a circular penetrating portion 44a and a fan-shaped penetrating portion 44b formed at four locations on the outer periphery of the penetrating portion 44a so as to be arranged at regular intervals. The engaging member 42 has a plurality of bolt holes 47b through which bolts 48 pass.

As shown in FIG. 4, all the engagement projections 34 of the nozzle 31 have the same width 32a. As shown in FIG. 6, all the penetrating portions 44b of the engaging member 42 have an equal width 32b slightly larger than the equal width 32a in order to allow the engaging protrusion 34 to pass therethrough. Also, as shown in FIG.
All the concave grooves 41b of the distal end portion 4 have an equal width 32c which is approximately twice the width of the equal width 32a of the engagement projection 34. As shown in FIG. 1, the gap 50 formed when the engagement member 42 is fixedly attached to the distal end portion 4 moves the nozzle 31 in a state where the engagement protrusion 34 is located in the gap 50. The thickness is slightly wider than the thickness 51 of the engagement projection 34 shown in FIG. 3 so that the engagement projection 34 can be manually turned.

In the injection molding machine having the above configuration,
Attachment and removal of the nozzle 31 are performed in the following manner. When the nozzle 31 is attached, the axis of the nozzle 31 and the axis of the distal end portion 4 are made to coincide with each other, and each engagement protrusion 34 and each penetration portion 44b of the engagement member 42 are made to coincide with each other. The rear end 33 of the nozzle 31 is inserted into the through portion 44. Then, after bringing the nozzle-side sealing surface 20 into contact with the main-body-side sealing surface 27, the nozzle 31 is rotated about its axis. Then, the front surface 40 of each engagement projection 34 is covered by the rear surface 65 of the engagement member 42, and the nozzle 31 is fixed in a state where the nozzle 31 is prevented from moving forward. When the nozzle 31 is to be removed, the nozzle 31 is pulled out by rotating the nozzle 31 about its axis and aligning the positions of the engaging projections 34 and the through portions 44b.

In this apparatus, the process of supplying the resin material from the injection unit 3 to the mold 10 is the same as that described in the conventional example, but the process between the nozzle side sealing surface 20 and the main body side sealing surface 27 is performed. Is secured by the driving force of the hydraulic drive device 13. That is, in a state where the nozzle 31 is sandwiched between the injection unit 3 and the mold 10,
The hydraulic drive device 13 applies a fastening force in a direction in which the injection unit 3 and the mold 10 approach each other. Then, the gap between the nozzle-side sealing surface 20 and the main-body-side sealing surface 27 is tightly matched without any gap. After this state is secured, the resin material is supplied into the mold 10.

According to the injection molding machine having the above configuration,
The mounting and dismounting of the nozzle 31 can be performed easily and in a short time because the structure can be performed with a small torque and a small rotation. Further, since the nozzle 31 is pressed while being sandwiched between the mold 10 and the injection unit 3 by the driving force of the hydraulic drive device 13, the space between the nozzle-side sealing surface 20 and the main-body-side sealing surface 27 is reduced. The tight fit is achieved and the leakage of the resin material from here is prevented. Further, since the engaging member 42 and the distal end portion 4 are separate parts, the engaging groove 41 can be easily machined when manufacturing the injection molding machine.

Next, a second embodiment will be described with reference to FIG. 7, the same components as those in FIGS. 1 to 6 described in the first embodiment are denoted by the same reference numerals, and description thereof will be omitted. In this embodiment, the front surface 40 of the engaging projection 34 and the rear surface 65 of the engaging member 42 engaging with the front surface 40 engage in a wedge shape when the nozzle 31 is rotated. It is an inclined surface.

According to the structure of this embodiment, when a rotational torque is applied to the nozzle, the rotational torque
2 generates a component force in the direction of pressing the engagement projection 34 against the main body side sealing surface 27. According to the injection molding machine having the above-described configuration, the same effects as those of the first embodiment can be obtained, and the nozzle-side sealing surface 20 and the main-body-side sealing surface 27 can be more closely matched. .

In the first and second embodiments, the number of the engagement projections 34 is four. However, the number of the engagement projections 34 is at least one, and is not limited to four. In the first and second embodiments, the engagement protrusion 34 is provided on the nozzle 31 side and the engagement groove 41 is provided on the tip end 4 side of the injection unit 3. A configuration in which the mating groove 41 is provided and the engagement protrusion 34 is provided on the injection unit 3 side may be adopted.

[0025]

According to the present invention, the mounting and dismounting of the nozzle can be performed easily and in a short time because the structure can be performed with a small torque and a small rotation. Further, since watertightness between the nozzle-side sealing surface and the main-body-side sealing surface is obtained by the driving force of the hydraulic drive device, leakage of the resin material from between these sealing surfaces is prevented. In addition, since the engaging member is a separate part from the tip of the injection unit, the engaging groove can be easily machined when manufacturing the injection molding machine.

[Brief description of the drawings]

FIG. 1 is a diagram showing a first embodiment of the present invention, and is a cross-sectional view of a main part of an injection molding machine.

FIG. 2 is a cross-sectional view of the injection molding machine taken along a plane AA.

FIG. 3 is a perspective view showing a component configuration of a main part of the injection molding machine.

FIG. 4 is a view showing a component part shape of the injection molding machine, and is a view as viewed on the plane BB.

FIG. 5 is a view showing the configuration of component parts of the injection molding machine, and is a view as viewed on the plane DD.

FIG. 6 is a view showing the configuration of component parts of the injection molding machine, and is a view as viewed on the plane CC.

FIG. 7 is a view showing a second embodiment of the present invention, and is a development view cut along a line EE.

FIG. 8 is a side view showing a conventional injection molding machine.

FIG. 9 is a sectional view of a main part of the injection molding machine.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Base 2 ... Support base 3 ... Injection unit 4 ... Tip part 5 ... Nozzle 7 ... Penetration part 8 ... Platen 9 ... Back surface 10 ... Gold Mold 13 ... Hydraulic drive 21 ... Front end 22 ... Ejection part 33 ... Rear end 34 ... Engagement projection 38 ... Screw means 40 ... Front 41 ...・ Engaging groove 42 ・ ・ ・ Engaging member 65 ・ ・ ・ Rear surface

Claims (3)

[Claims] 1. A base, a support base is fixed on the base, and an injection unit mounted on the upper surface of the support base so as to be movable in a horizontal direction, and mounted on a tip end of the injection unit. A nozzle, a platen fixed at a position facing the nozzle on the base and having a penetrating portion through which the nozzle is inserted, and an injection fixedly mounted on the back surface of the platen and abutting the front end of the nozzle. In an injection molding machine provided with a mold in which a portion is formed, and a driving device that moves the support table toward and away from the platen, the rear end of the nozzle is orthogonal to the axis of the nozzle, and An engagement projection projecting outward from the axis is formed. The tip of the injection unit receives the engagement projection of the nozzle when the nozzle is moved in the axial direction of the nozzle. Allowed and accepted An engagement groove that allows the nozzle to rotate about its axis is formed, and further, when the nozzle is rotated in the engagement groove, the nozzle engages with the front side of the engagement protrusion. An injection molding machine comprising an engaging member for preventing the nozzle from moving forward. 2. The injection molding machine according to claim 1, wherein a front surface of the engagement protrusion and a rear surface of the engagement member engaged with the front surface are wedge-shaped when the nozzle is rotated. An injection molding machine characterized in that the inclined surface engages. 3. The injection molding machine according to claim 1, wherein the engaging member is formed as a separate member from a tip of the injection unit, and is attached to the tip by screwing means. An injection molding machine characterized by the following.