JPH0541870Y2 - - Google Patents

Description

[Detailed description of the invention] <Technical field> This invention relates to an eject pin for a foam molding machine, which has a pair of molds, a fixed mold and a movable mold. To,
In a foam molding machine that manufactures a foam molded product by filling expandable thermoplastic resin particles and heating and fusing them, a mold is provided so as to protrude freely from the fixed mold into the mold cavity, and when the molded product is removed from the mold, It relates to eject pins used for extruding molded products.

<Prior art> The general structure of the above-mentioned conventional foam molding machine and eject pin is shown in FIGS.
0' and a male-shaped movable mold 20' attached to a movable die plate 2' are installed facing each other so as to be movable in opening and closing, and as shown in FIG. 4, both molds 10',
The mold cavity 3' formed in the middle when the mold 20' is closed is filled with foamable thermoplastic resin particles such as foamed polystyrene, and the resin particles are heated and fused using a heating medium such as steam. Manufacture molded product F. Thereafter, as shown in FIG. 5, after the movable mold 20' is moved in the opening direction to open the mold, an eject pin 4' attached so as to be able to protrude freely into the mold cavity 3' from the mold inner surface of the fixed mold 10' is used. The molded product F is extruded from the fixed mold 10', the mold is removed, and the molded product F is taken out.

The movable mold 20' and the movable die plate 2' are operated by a cylinder mechanism 5', and the movable mold 20' is in a mold closing position where it abuts the fixed mold 10', and the fixed mold 1 is in a mold closing position.
It moves back and forth between 0' and a mold opening position that is spaced a certain distance apart. Further, the eject pin 4' has an extrusion plate 40' at the tip and a pin shaft portion 41' integrally formed, and the extrusion plate 40' is embedded and installed in the inner surface of the fixed mold 10', and the pin axis A portion 41' extends long and protrudes from the rear end of the fixed mold 10'. Then, the push plate 21', which is attached integrally with the movable die plate 2' and extended to the back side of the fixed die plate 1', pushes the rear end of the pin shaft portion 41' to move the eject pin 4' forward. Operate protrusion. Note that 42' is a spring for returning the eject pin 4'. Further, a raw material filler 6' is attached to the fixed mold 10', and the molding machine is also provided with various attached mechanisms, but their explanations will be omitted.

In a molding machine having the above structure, in order to change the shape of the molded product F, the fixed mold 10' and the movable mold 20' are removed from the fixed die plate 1' and the movable die plate 2' and replaced. In addition, during inspection and maintenance, mold 1
It is frequently necessary to attach and detach 0' and 20'.

However, when attempting to attach both dies 10' and 20' to each die plate 1' and 2' with the eject pin 4' still attached to the fixed die 10', both die plates 1' and 20' are attached as shown in FIG. Even when 1' and 2' are opened to the maximum, there is a gap between both 1' and 2'.
Since w' is narrower than the overall assembly length L' of both molds 10', 20' and eject pin 4', if it is left as is, both molds 10', 20' and eject pin 4' will be
It is impossible to insert and attach the die plate between the die plates 1' and 2'.

Therefore, conventionally, the eject pin 4' was removed from the fixed mold 10', and after both molds 10' and 20' were attached to the die plates 1' and 2', the eject pin 4' was returned to the fixed mold 10' and reattached. was.
In addition, when removing the molds 10', 20', remove the eject pin 4' from the fixed mold 10', and then remove the entire molds 10', 20' from the die plates 1', 2'. It had been removed from.

Therefore, each time the molds 10' and 20' are installed and removed, it is necessary to separate and reassemble only the eject pin 4', which is very troublesome, has very poor work efficiency, and takes a long time. There was once a time. Since it takes time and effort to attach and detach the molds 10' and 20', many problems have occurred, such as a decrease in the operation rate of the entire molding machine and a deterioration in the production efficiency of molded products.

<Purpose> Therefore, the purpose of this invention is to solve the above-mentioned problems of the prior art and provide an eject pin that allows the mold to be attached and removed while the mold and eject pin are assembled together. be.

<Structure> In order to achieve the above object, the die plates on the fixed side and the movable side are opposed to each other and are formed to be openable and closable, and each die plate has a fixed die and a movable die that form a pair of molds. This is an eject pin for extruding a molded product attached to a fixed mold for a foam molding machine to which the mold is attached, and a bending part that can bend the rear shaft part is formed in the middle of the shaft part that protrudes from the back of the fixed mold. It is characterized by

<Example> Next, an example of this invention will be described below with reference to the drawings.

FIG. 1 shows a separated state in which only the fixed mold 10, the movable mold 20, and the eject pin 4 are assembled together and are not attached to the molding machine main body. and,
In the molding machine main body, 1 is a fixed die plate, 2
21 is a moving die plate, 21 is a pushing plate, and 5 is a cylinder mechanism. The structure and shape of each member of the molding machine main body are exactly the same as those of the conventional molding machine, so a detailed explanation will be omitted. In addition, in the explanation of FIGS. 4 to 6 regarding the prior art, the explanation regarding the members having the same numerals and the dash symbol as the reference numerals attached to the above-mentioned members is directly applicable to the embodiment of this invention. This can also be applied to certain Figure 1. Also, fixed type 1
The structure and shape of the mold 0 and the movable mold 20 are changed as appropriate depending on the shape of the molded product to be manufactured.

The eject pin 4 includes an extrusion plate portion 40 at the tip and a shaft portion 41 integrally formed therewith.
It is similar to the conventional one in that it consists of 42
is a return spring.

In this invention, a bent part 43 is formed in the middle of the shaft part 41 at the rear part of the shaft part 41 that protrudes outward from the back surface of the fixed mold 10, and the shaft part 44 behind this bent part 43 is formed. , is configured to be able to bend inward of the fixed mold 10 up to a substantially right angle with respect to the front portion.

As shown in detail in FIGS. 2 and 3, the specific structure of the bent portion 43 is such that the rear shaft portion 44 is rotatably supported on the front portion of the shaft portion 41, and the rear shaft portion 44 is rotatably supported on the front portion of the shaft portion 41. A fixing sleeve 45 is provided which is slidably inserted through the. The rear shaft portion 44 of the shaft portion 41 can be easily bent to a substantially right angle at the bending portion 43 that is rotatably supported (as shown in FIG. 2). Further, by extending the rear shaft portion 44 in a straight line with respect to the front portion of the shaft portion 41 and moving the sleeve 45 to the position of the bent portion 43, the rear shaft portion 44 is fixed in an extended state ( (Situation shown in Figure 3).

Note that 46 is a sleeve actuating spring that elastically pushes the sleeve 45 forward from the rear shaft portion 44 side, and when the rear shaft portion 44 is extended, the sleeve 45 automatically bends. Part 4
It is designed to move to position 3. Reference numeral 47 denotes a stopper provided on the front side of the shaft portion 41 to fix the sleeve 45 at the position of the bent portion 43. A fine adjustment screw 48 is screwed onto the end of the eject pin 4, and by adjusting the protrusion amount of the fine adjustment screw 48, the overall length of the eject pin 4 can be finely adjusted. .

Further, in a portion of the shaft portion 41 in front of the bent portion 43, 49 is a threaded connection portion, and the entire shaft portion 41 rearward of the stopper 47 portion, that is, the operating mechanism of the sleeve 45, etc. is connected to the front portion of the shaft portion 41. It is threadedly connected to and detachably formed. Therefore, when replacing or repairing the sleeve 45 or the like, the front portion of the shaft portion 41 remains attached to the fixed mold 10, and only the rear portion can be removed.

In order to use the eject pin 4 having the above structure, as shown in FIG.
The rear shaft portion 44 is bent at a bending portion 43 at a substantially right angle. Then, when the fixed die plate 1 and the movable die plate 2 are opened, the fixed die 10 and the movable die 20 including the eject pin 4 are opened.
The total length L is shorter than the distance w between both die plates 1 and 2. Therefore, both molds 10 and 20 can be inserted between both die plates 1 and 2 in an assembled state.

After the insertion, the fixed mold 10 and the movable mold 20 are fixed to the die plates 1 and 2 by means such as bolt attachment, and the eject pin 4 is bent from the bent portion 43 to extend the rear shaft portion 44, Shaft 4
If the entire eject pin 1 is returned to a straight line, it can be used in the same manner as a conventional eject pin, and there is no problem with the ejecting operation of the eject pin 4.

Also, when removing the molds 10 and 20,
Similarly to the above attachment, once the eject pin 4 is bent at the bending portion 43 to shorten the overall length and then removed, the molds 10, 20 and the eject pin 4 can be removed in the assembled state.

Among the structures of the eject pin 4 described above,
The bent portion 43 is formed at a position where the total length L when the eject pin 1 is bent when assembled in the molds 10 and 20 is even slightly shorter than the distance w between the die plates 1 and 2. Can be set at any position.

Further, as the bending portion 43, it is sufficient that the rear shaft portion 44 can be bent to a substantially right angle, and the rear shaft portion 44 and the front portion may be rotatably supported by pins, bolts, or the like.

Further, the sleeve 45 that fixes the bent portion 43 in an extended state prevents the eject pin 4 from bending or bending when the eject pin 4 is used to extrude the molded product. 45, it is also possible to fix the bent portion 43 using an appropriate engagement mechanism or fastening mechanism.

The eject pin 4 of this invention can be freely applied not only to the illustrated molding machine but also to molding machines of various ordinary structures.

<Effects> According to the eject pin 4 of this invention configured as described above, when it is assembled into the fixed mold 10, the bent portion 43 is formed in the middle of the shaft portion 41 protruding from the back surface of the fixed mold 10. By forming the shaft portion 41 to be bendable, even when the fixed mold 10 and the movable mold 20 are assembled, the total length L when the eject pin 4 is bent is the same as that between the die plates 1 and 2. The distance is shorter than the distance w, and the assembled eject pin 4 and molds 10 and 20 can be inserted and attached between the die plates 1 and 2.

Therefore, the mounting and dismounting work of the molds 10 and 20 can be performed extremely quickly, and is much more efficient than the conventional mounting and dismounting work in which the eject pins 4 are removed one by one.

After the molds 10 and 20 are attached, if the eject pin 4 is extended again, it can be used in the same way as a conventional eject pin for the subsequent work of removing the molded product. There is no problem at all with the pushing movement.

As described above, by being able to attach and detach the molds 10 and 20 very quickly and easily, it can greatly contribute to improving the efficiency of the entire molding operation and production efficiency. Furthermore, the structure of the molding machine other than the eject pin 4 does not need to be changed at all and the same structure as before can be used, so the manufacturing cost of the molding machine does not increase and the structure and method of use do not become complicated. Also, eject pin 4
As for the structure itself, since only a part of the structure, such as the bent portion 43, is changed, manufacturing is easy and there is no need to worry about high cost.

Furthermore, in the present invention, since the rear shaft part 44 of the eject pin 4 is formed with a bendable part 43, the mold 1 can be easily bent by simply bending the rear shaft part 44.
0.0,20 attachment/detachment operations can be performed. Therefore, attachment and detachment work can be easily performed even in a narrow space.

Moreover, in the case of foam molding machines, a so-called two-story structure, in which the machine is placed on a stand about 3 meters high, is often adopted. Therefore, in this case, type 1
The attachment and detachment work of molds 10 and 20 must also be performed on the upper foam molding machine installed at a high place, but in the present invention, the attachment and detachment work of molds 10 and 20 can be done simply by bending the rear shaft portion 44. Therefore, even when replacing the mold of a foam molding machine located at such a high place, the attachment/detachment work can be performed easily and safely.

In the present invention, since the bending part 43 is formed so that the rear shaft part 44 of the eject pin 4 can be bent, even if the number of eject pins 4 reaches several tens, the mold 10 can be easily bent by simply bending the rear shaft part 44. ，
20 attachment/detachment operations can be performed. Therefore, also from this point of view, there is an advantage that the work of attaching and detaching the molds 10 and 20 becomes easier.

[Brief explanation of the drawing]

The figures show an embodiment of this invention and a conventional example. Fig. 1 is a structural sectional view of the entire molding machine with the mold separated, Fig. 2 is an enlarged view of the main part showing the bent state of the eject pin, Fig. 3 is an enlarged view of the main parts showing the extended state, Fig. 4 is a structural sectional view of the entire conventional molding machine, and Fig. 5 is a sectional view of the same mold in the opened state.
FIG. 6 is a sectional view of the mold separated. 1...Fixed die plate, 10...Fixed type, 2
...Moving die plate, 20...Moving type, 4...
Eject pin, 40... Extrusion plate, 41... Shaft portion, 42... Spring, 43... Bent portion, 45
……sleeve.

Claims (1)

[Claims for Utility Model Registration] 1. A foam molding machine in which die plates on a fixed side and a movable side are opposed to each other and are formed to be openable and closable, and each die plate is equipped with a fixed die and a movable die, which form a pair of molds. On the other hand, the foam molding is an eject pin for extruding a molded product attached to a fixed mold, which is characterized by forming a bending part in the middle of the shaft protruding from the back surface of the fixed mold so that the rear shaft part can be bent. Machine eject pin. 2. As for the bent part, the rear shaft part is rotatably supported relative to the front part of the shaft part, and a sleeve for fixing the bent part is inserted and attached to the shaft part. Claim 1 of the above-mentioned utility model registration An eject pin for a foam molding machine as described in Section 1.