JP2010149297A - Foamed resin molding raw material packing machine and mold using the raw material packing machine - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To control the traceability of a molding by using the piston of a raw material packing machine. <P>SOLUTION: The foamed resin molding raw materia packing machine has a sleeve 2 in which an opening 21 connected to a cavity 93 formed between a fixed mold 90 and a movable mold 91 is formed, an inflow part 31 for supplying the raw material into the cavity, and the piston 5 which moves forward/backward between an advance position closing the opening 21 of the sleeve 2 and a retreat position allowing the inflow of the raw material. With regard to the piston 5, a plunger 51 with an index formed is set at the head end, and an expression 25 corresponding to the index is formed in the peripheral part of the opening 21 of the sleeve 2. The piston 5 is installed to be able to rotate with the longitudinal direction of the piston 5 made an axis to make the index of the plunger 51 be turned to the expression 25. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a raw material filling machine that supplies and fills pre-foamed resin beads into a cavity of a mold in foamed resin molding, and a mold using the raw material filling machine.

FIG. 9 is a cross-sectional view showing a conventional mold for foamed resin molding. As is well known, the mold (9) is composed of a fixed mold (90) having a back plate (92) and a movable mold (91), and a cavity (93) is formed between both molds (90) (91). It is formed. Both molds (90) and (91) form heating spaces (90a) and (91a) on the inner side, and the heating steam is filled in the heating spaces (90a) and (91a) during molding.
After the foamed resin beads, which are raw materials, are filled in the cavity (93), heated and cooled, the movable die (91) moves to the left, and the eject pin (8) fitted in the back plate (92) becomes the molded product ( (Not shown) protrudes from the stationary mold (90). In the following description, the direction in which the movable mold (91) is separated from the fixed mold (90) is the front, and the reverse direction is the rear.
A raw material filling machine (1) for supplying foamed resin beads into the cavity (93) is also attached to the back plate (92).
The raw material filling machine (1) is connected to a sleeve (2) provided with a fixed flange (20) fixed to a back plate (92) and a hopper (10), and raw materials are supplied and compressed air is introduced. A branch pipe (3) and a cylinder (4) extending from the rear end of the branch pipe (3). The front end of the sleeve (2) is connected to the cavity (93). A valve (11) is provided between the hopper (10) and the branch pipe (3).

FIG.10 and FIG.11 is sectional drawing of the conventional raw material filling machine (1) (refer patent document 1). The branch pipe (3) has a through hole (30) connected to the inside of the sleeve (2), and has a first inflow part (31) through which raw materials flow and a second inflow part (32) through which compressed air is fed. Yeah. The first inflow portion (31) is connected to the through hole (30), and the second inflow portion (32) is connected to the inside of the sleeve (2). A bush (6) is provided between the branch pipe (3) and the cylinder (4), and a first air supply hole (60) connected to the cylinder (4) is opened in the bush (6). . A piston (5) is slidably provided in the cylinder (4) and the branch pipe (3). The piston (5) includes a piston rod (50) penetrating the bush (6), and the piston rod (50 ) And a flange (52) located at the rear end of the piston rod (50).
A cap (40) having a second air supply hole (41) is fitted into the rear end of the cylinder (4). The piston (5) moves back and forth between a forward position (see FIG. 11) where the flange (52) is in contact with the bush (6) and a retracted position (see FIG. 10) where the flange (52) is in contact with the cap (40). Moving. In the forward position, the plunger (51) of the piston (5) closes the front opening (21) of the sleeve (2).

The operation during molding is shown below. First, the fixed mold (90) and the movable mold (91) are clamped to form a cavity (93) and air is fed from the first air supply hole (60). The air pushes the flange (52) backward, and stops the air from the first air supply hole (60) after the piston (5) is installed in the retracted position. Next, compressed air is supplied from the second inflow part (32), the compressed air flows into the cavity (93), and pores or slits (not shown) formed on the surface of the movable mold (91). Are discharged into the heating space (91a) of the movable mold (91).
At this time, the inside of the sleeve (2) is in a negative pressure state, and the foamed resin beads as the raw material are fed from the hopper (10) through the first inflow portion (31). The foamed resin beads ride on the flow of compressed air from the second inflow portion (32) and are sent into the cavity (93).
When the foamed resin beads are filled in the cavity (93), the valve (11) is closed and air is fed from the second air supply hole (41) to push the flange (52) forward. When the piston (5) reaches the advanced position, the plunger (51) closes the front opening of the sleeve (2). Thus, the foamed resin beads are filled in a state of being enclosed in the cavity (93), and steam is poured into the heating spaces (90a) (91a) to start molding.

In the traceability management (manufacturing history management) of such a molded product, the date and time of manufacture and date of the molded product may be attached to the surface of the molded product. Conventionally, the production date and time of the molded product are given to the surface of the molded product by using the eject pin (8) which projects the molded product from the fixed mold (90) at the time of mold release.
FIG. 12 is a cross-sectional view of a conventional eject pin (8) (see Patent Document 2). The eject pin (8) is provided with a pin main body (80) and a flange (81) disposed at the tip of the pin main body (80) and in contact with the molded product. Is forming. An indicator plate (83) with an arrow (85) pointing to the outer periphery is screwed to the recess (82).
FIG. 13 is a front view of the ridge (81). A display part (86) in which numbers representing the year of manufacture or the month are engraved in the opposite direction is formed around the indicator plate (83) on the ridge (81), and the indicator plate (83) has an arrow ( The screw (84) is fastened with 85) facing the number representing the year or month of the production lot.
When the ridge (81) of the eject pin (8) contacts the molded product being solidified, an arrow and a number are imprinted on the surface of the molded product. Since the numbers appear opposite to the display section (86), the correct number is stamped on the molded product.

JP-A-5-77331 JP-A-2005-14568

Depending on the molded product, there is a case where it is desired to prevent an arrow and a number from being imprinted on the protruding portion of the eject pin (8) from the viewpoint of appearance. Further, for example, in a molded product molded with a mold having a small space for providing the eject pin (8), there is a possibility that an arrow and a number are not stamped.
In view of this point, the applicant has conceived of performing traceability management of a molded product using the piston (5) of the raw material filling machine (1).
An object of the present invention is to perform traceability management of a molded product using a piston of a raw material filling machine.

A sleeve (2) formed with an opening (21) connected to a cavity (93) formed between a fixed mold (90) and a movable mold (91), an inflow portion (31) into the cavity of the raw material, and a sleeve ( 2) A foamed resin molding raw material filling machine comprising a piston (5) that moves back and forth between a forward position that closes the opening (21) of 2) and a backward position that allows inflow of raw materials.
The piston (5) is provided with a plunger (51) formed with an index at the tip, and an indication (25) corresponding to the index is formed on the periphery of the opening (21) of the sleeve (2). Is provided so as to be rotatable about the longitudinal direction of the piston (5) so that the indicator of the plunger (51) is directed to the display (25).
A cap (40) is provided behind the sleeve (2), the cap (40) supports one end of a guide pin (55) substantially parallel to the piston (5), and the piston (5) The piston (5) is inserted into the guide pin (55) in a state in which the rotation about the longitudinal direction is restricted, and a fastener for switching the rotation and rotation restriction of the guide pin (55) is provided in the cap (40). Has been.

1. In the present invention, the indication (25) corresponding to the index is given on the molded product by the piston (5) that closes the cavity (93). Therefore, an arrow as an index and a number or symbol as a display (25) can be attached even to a molded product molded with a mold having a small space for providing the eject pin (8).
Further, since the piston (5) is rotatable about the longitudinal direction as a central axis, the index of the plunger (51) is easily directed to the display (25) formed at the peripheral edge of the opening (21) of the sleeve (2). be able to.
2. After adjusting the index toward the display (25), the rotation of the guide pin (55) can be regulated by operating the fastener (70). Since the rotation of the piston (5) is restricted by fitting the guide pin (55) to the piston (5), if the rotation of the guide pin (55) is restricted, the rotation of the piston (5) is also restricted. Is done. As a result, inadvertent rotation of the plunger (51) is restricted, and the index and display (25) of the molded product are accurately given on the molded product.

Hereinafter, an embodiment of the present invention will be described with reference to the drawings. This example is characterized by the piston (5) of the raw material filling machine (1), and the configuration of the fixed mold (90) and the movable mold (91) is the same as that of the conventional example shown in FIG.
1A and 1B are cross-sectional views of a raw material filling machine (1) according to this example. The raw material filling machine (1) is connected to a sleeve (2) provided with a fixing flange (20) fixed to a back plate (92) and a hopper (10) (see FIG. 9), and raw materials are supplied. A branch pipe (3) into which compressed air is introduced and a cylinder (4) extending from the rear end of the branch pipe (3) are provided. The front opening (21) of the sleeve (2) is connected to the cavity (93), and a tapered surface (23) whose diameter decreases toward the front is formed at the front end of the inner hole (22) of the sleeve (2). Has been.
The branch pipe (3) includes a first inflow part (31) through which the raw material flows and a second inflow part (32) through which compressed air is fed. The first inflow portion (31) and the second inflow portion (32) are connected to the inner hole (22) of the sleeve (2). A bush (6) is provided between the branch pipe (3) and the cylinder (4), and a first air supply hole (60) connected to the cylinder (4) is opened in the bush (6). . The first air supply hole (60) may be provided on the side surface of the cylinder (4).

A piston (5) is slidably provided in the sleeve (2), the branch pipe (3), the bush (6) and the cylinder (4), and the piston (5) is a piston rod penetrating the bush (6). (50), a plunger (51) located at the front end of the piston rod (50), and a flange (52) located at the rear end of the piston rod (50). The piston rod (50) fits into the bush (6) and is guided in a straight line.
The piston rod (50) is hollow, and the slide is guided by a guide pin (55) substantially concentric with the piston rod (50). As will be described later, the piston rod (50) is inserted into the guide pin (55) in a state where the rotation about the longitudinal direction of the piston (5) is restricted. The guide pin (55) protrudes rearward from the piston rod (50) and fits into the flange (52).
A cap (40) having a second air supply hole (41) is fitted and fixed to the rear end of the cylinder (4). The piston (5) has a forward position (see FIG. 1 (b)) where the flange (52) is in contact with the bush (6) and a reverse position (see FIG. 1 (a)) where the flange (52) is in contact with the cap (40). ). When the piston (5) moves forward, the plunger (51) is guided by the tapered surface (23), and in the advanced position, the plunger (51) closes the front opening (21) of the sleeve (2). The foamed resin beads are filled in a state of being enclosed in the cavity (93), and molding is started.

  At the time of molding, air is sent from the first air supply hole (60), the flange (52) is pushed backward, and the piston (5) is installed in the retracted position. Next, compressed air is supplied from the second inflow portion (32) to bring the inside of the sleeve (2) into a negative pressure state, and the foamed resin beads are fed from the first inflow portion (31). The foamed resin beads flow into the cavity (93) through the through hole (30) of the branch pipe (3) and the inner hole (22) of the sleeve (2). When the foamed resin beads are filled in the cavity (93), air is sent from the second air supply hole (41) and the flange (52) is pushed forward. When the piston (5) reaches the advanced position, the plunger (51) closes the front opening of the sleeve (2). The foamed resin beads are filled in a state of being enclosed in the cavity (93), and steam is injected into the heating spaces (90a) (91a) to start molding. This procedure is the same as in the prior art.

  2 (a), 2 (b), and 2 (c) are side views of the distal end surface of the plunger (51) and the peripheral edge portion of the front opening (21) of the sleeve (2). An arrow (54) as an index is attached to the tip surface of the plunger (51), and a display (25) indicated by the arrow (54) such as numerals and symbols is attached to the front surface of the sleeve (2). The indication (25) on the front surface of the sleeve (2) indicates the year of manufacture of the molded product as shown in FIG. 2 (a) and the month of manufacture of the molded product as shown in FIG. 2 (b). As shown in FIG. 2 (c), there are some that indicate the date of manufacture of the molded product. By rotating the guide pin (55) and the piston rod (50) about the central axis L and directing the tip of the arrow (12) of the plunger (51) to a number or symbol, it is manufactured on the surface of the molded product. , Month and day.

3 is a cross-sectional view of the piston (5) and the cap (40) in the retracted position, and FIG. 4 is a view of the piston (5) of FIG. It is sectional drawing. The guide pin (55) integrally includes a polygonal portion (55a) having a hexagonal cross section and a round shaft portion (55b) connected to the rear end portion of the polygonal portion (55a). The polygonal part (55a) of the guide pin (55) fits almost concentrically with the piston rod (50), and the inner hole (53) of the piston rod (50) has a hexagonal cross section corresponding to the polygonal part (55a). Formed. That is, the piston rod (50) is guided to move back and forth by the guide pin (55) in a state where the rotation about the central axis L is restricted. The flange (52) is also guided in the back-and-forth movement in a state where the rotation about the central axis L is restricted by the polygonal portion (55a) of the guide pin (55).
Although the polygonal portion (55a) of the guide pin (55) is described as having a hexagonal cross section, it may be any shape that restricts the rotation of the piston rod (50) and the flange (52). Other polygons may be used.

The round shaft portion (55b) of the guide pin (55) is fitted in the cap (40). That is, one end of the guide pin (55) is supported by the cap (40).
FIG. 5 is a cross-sectional view of the cap (40) of FIG. 3 taken along the vertical plane including the line BB and viewed from the direction of the arrow. A screw (70) as a fastener is screwed from the outside of the cap (40), and the tip of the screw (70) is in contact with the round shaft portion (55b). When the screw (70) is loosened, the guide pin (55) can be rotated, and when the screw (70) is tightened, the rotation of the guide pin (55) is restricted.
The guide pin (55) and the piston rod (50) are rotated about the central axis L, and the tip of the arrow (54) (see FIG. 2) of the plunger (51) is directed to a number or symbol, and then a screw ( Tighten 70). The outer peripheral surface of the round shaft portion (55b) is pressed against the inner surface of the cap (40) at the position D in FIG.
As a result, inadvertent rotation of the guide pin (55) and the piston rod (50) is restricted, and the manufacturing year, month, and date of the molded product are accurately marked on the molded product. That is, even if a large number of molded products are mass-produced, the manufacturing year, month and day of the molded products are given in a fixed state.

FIG. 6 is a right side view of the cap (40) of FIG. 3 as viewed from the C direction. The round shaft portion (55b) of the guide pin (55) passes through the cap (40), and the rear end portion is exposed from the rear end surface of the cap (40). An adjustment hole (56) is formed in the rear end surface of the guide pin (55), and a jig (not shown) for adjusting the rotation of the guide pin (55) is fitted into the hole (56).
As described above, since the plunger (51) rotates together with the guide pin (55), loosening the screw (70) and rotating the guide pin (55) with a jig also rotates the plunger (51). . Therefore, the arrow (54) on the plunger (51) can be directed to the display (25).
As shown in FIG. 6, if an auxiliary arrow (57) serving as an auxiliary index is previously attached to the rear end surface of the guide pin (55) in the same direction as the arrow (54) of the plunger (51), the fixed type ( The rotational position of the guide pin (55) can also be adjusted or confirmed from the outside of 90).

  In the above description, the screw (70) is screwed from the outside of the cap (40) to prevent the guide pin (55) from rotating. However, as shown in FIG. 7, a recess (75) is provided on the outer periphery of the round shaft portion (55a) of the guide pin (55), and a cap (40) is biased inwardly by a spring (77). 76), and the stop pin (76) may be inserted into the recess (75) to stop the rotation of the guide pin (55).

8A and 8B are enlarged cross-sectional views of the front end portion of the sleeve (2). As shown in FIG. 8 (a), if the front end surface of the sleeve (2) is substantially perpendicular to the direction of travel of the piston rod (50), the arrow (12) and display on the molded product (95) The portion marked with (25) is not recessed from the molded product (95).
However, as shown in FIG. 8 (b), if the front end surface of the sleeve (2) is inclined with respect to the direction of travel of the piston rod (50), an arrow (54) and a display on the molded product (95) The portion marked with (25) is recessed from the molded product (95). Actually, the depth of the recess (d in FIG. 8B) is about several millimeters, and it is considered that there is no problem in the appearance of the molded product (95).

  The above description of the embodiments is for explaining the present invention, and should not be construed as limiting the invention described in the claims or reducing the scope thereof. In addition, the configuration of each part of the present invention is not limited to the above embodiment, and various modifications can be made within the technical scope described in the claims.

(a), (b) is sectional drawing of the raw material filling machine concerning this example, (a) shows an advance position, (b) shows a retreat position, respectively. (a), (b), (c) is a side view of the peripheral surface of the front end surface of the plunger and the front opening of the sleeve. It is sectional drawing of the piston and cap in a retracted position. It is sectional drawing which fractured | ruptured the piston of FIG. It is sectional drawing which fractured | ruptured the cap of FIG. It is the right view which looked at the cap of FIG. 3 from the C direction. It is sectional drawing which shows another Example of the rotation prevention mechanism of a guide pin. (a), (b) is sectional drawing which shows another Example of a guide pin. It is sectional drawing which shows the conventional metal mold | die for foaming resin molding. It is sectional drawing of the conventional raw material filling machine, and shows the retreat position of a piston. It is sectional drawing of the conventional raw material filling machine, and shows the advance position of a piston. It is sectional drawing of the conventional eject pin. It is a front view of the ridge of an eject pin.

Explanation of symbols

(1) Raw material filling machine
(2) Sleeve
(3) Branch pipe
(5) Piston
(21) Front opening
(40) Cap
(50) Piston rod
(51) Plunger
(55) Guide pin

Claims (5)

Between the sleeve formed with the opening connected to the cavity formed between the fixed mold and the movable mold, the inflow portion to the cavity of the raw material, the advance position closing the opening of the sleeve, and the retracted position allowing the inflow of the raw material A foam resin molding material filling machine having a piston that moves back and forth,
The piston is provided with a plunger having an index formed at the tip, and a display corresponding to the index is formed on the peripheral edge of the opening of the sleeve. The piston is centered on the longitudinal direction of the piston so that the index of the plunger is directed to the display. As a raw material filling machine for foaming resin molding, characterized in that it is rotatably provided as: A cap is provided behind the sleeve, and the cap supports one end of a guide pin that is substantially parallel to the piston. The piston is inserted into the guide pin in a state in which rotation about the longitudinal direction of the piston is restricted as a central axis. The foam resin molding raw material filling machine according to claim 1, wherein the cap is provided with a fastener that switches between rotation and restriction of the guide pin. The raw material filling machine for foamed resin molding according to claim 2, wherein the guide pin includes a polygonal portion that fits into the piston and restricts rotation of the guide pin, and a round shaft portion that contacts the fastener. The raw material filling machine for foamed resin molding according to any one of claims 1 to 3, wherein the guide pin penetrates the cap, and an auxiliary index corresponding to the index of the plunger is formed on the guide pin. A mold comprising the foam resin molding raw material filling machine according to any one of claims 1 to 4.

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