JP2022165435A - Raw material filling machine for foamed plastic - Google Patents

Abstract

In a conventional material filling machine, a material is filled from a direction perpendicular to a mold (roughly perpendicular), so a Teflon(registered trademark) coating to improve mold release and a grainy finish to improve appearance are sometimes damaged by repetitive material filling. In addition, a filling process consists of two steps: material filling and blowback, in which excess material is returned to a hopper. In the conventional material filling machine, compressed air is emitted from a same air outlet hole in both processes. Therefore, in order to achieve complete blowback, more compressed air than necessary is emitted in the filling process.CONSTITUTION: In this invention, a raw material is filled in a direction parallel to a wall thickness of a foamed plastic molded product (roughly horizontal), so there is no risk of mold damage, etc. In addition, a configuration is such that minimum necessary compressed air is emitted during raw material filling, and the compressed air from a separate path is added during a blowback process.SELECTED DRAWING: Figure 1

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a foamed plastic raw material filling machine for filling a foamed plastic raw material into a cavity of a mold for molding foamed plastic with compressed air.

Molding of foamed plastic (polystyrene foam, foamed polypropylene, foamed polyethylene, etc.) is carried out by inserting the foamed plastic raw material into a foamed plastic raw material filling machine (hereinafter referred to as "raw material filling machine") into a mold for molding foamed plastic (hereinafter referred to as "mold ) is filled by injection into the cavity. Aluminum is widely used as the material for this mold because it is formed by heating with steam and cooling with water, etc. in the molding process. Surface treatments such as Teflon (registered trademark) coating are often applied to improve mold release.

Various types of raw material filling machines are known. The invention according to Patent Document 1 is a raw material filling machine for filling a raw material of pre-expanded particles into a foam molding mold, which has a filling opening 2 with a reduced diameter in the mold and has both inner and outer cylinders. A raw material supply pipe 1 consisting of 1a and 1b and having a raw material supply air passage 3 between the inner and outer cylinders 1a and 1b is opened. 5 and an integrally formed member 40 formed by drilling a raw material flow passage 6 adjacent to the cylinder 4 and parallel to the axial direction. A structure is adopted in which it communicates with the supply pipe 1 and communicates with the raw material supply port 7 at its rear end.

JP-A-6-71771

However, in the invention according to Patent Document 1, the raw material is supplied into the mold from the filling opening of the raw material supply pipe by the raw material feeding air blown into the raw material feeding air passage formed between the inner and outer cylinders. Since it is a filling structure, if the material of the mold is aluminum, which is a publicly known and widely used material, it is softer than other metals. Damage to the portion of the surface (cavity surface) that repeatedly hits, peeling of the surface treatment, etc. may occur. Further, in order to improve the appearance of the exterior, a textured pattern is sometimes applied to a foamed plastic molded product, which may damage the textured surface in the mold.

Therefore, in order to avoid the above problems, the present invention is a plastic foam that avoids damage to the surface of the mold by discharging the raw material substantially horizontally with respect to the axial direction so that it does not directly hit the surface of the mold (cavity surface). is to provide a raw material filling machine.

The invention of claim 1 is a foamed plastic material filling machine for filling a material into a cavity of a mold for molding foamed plastic via compressed air, wherein an outer cylinder nozzle portion having an opening for discharge is connected to a front end thereof. an outer cylindrical body, an inner cylindrical body which is housed in the outer cylindrical body so as to be movable back and forth, and which is connected to the front end of a discharge valve body portion which can be retracted from the discharge port of the outer cylinder nozzle portion; A drive means for moving back and forth the inner cylindrical body which is movably inserted and in which a piston body that performs piston movement is fitted and fixed, and one side of which is connected to the front of the driving means and the other side of which is connected to the rear of the outer cylindrical body. A compressed air introduction part inserted and fixed, and a raw material supply pipe connected to the rear of the driving means are provided, and a plurality of discharge holes and a plurality of inclined holes inclined in the axial direction are provided on the outer periphery of the discharge valve body. and the raw material press-fitted into the inner cylinder and the discharge valve body from the raw material supply pipe forms a flow path formed between the inner circumference of the outer cylinder and the outer circumference of the inner cylinder from the compressed air introduction part. The foamed plastic raw material is discharged from the discharge hole of the discharge valve body projecting from the discharge port of the outer cylinder nozzle part through the compressed air that flows into the discharge valve body from the inclined hole. Filling machine.

According to a second aspect of the invention, there is provided a foamed plastic raw material filling machine for filling a raw material into a cavity of a foamed plastic molding mold through compressed air, wherein an outer cylinder nozzle portion having a discharge port is connected to a front end thereof. an outer cylindrical body, an inner cylindrical body which is housed in the outer cylindrical body so as to be movable back and forth, and which is connected to the front end of a discharge valve body portion which can be retracted from the discharge port of the outer cylinder nozzle portion; A drive means for moving back and forth the inner cylindrical body which is movably inserted and in which a piston body that performs piston movement is fitted and fixed, and one side of which is connected to the front of the driving means and the other side of which is connected to the rear of the outer cylindrical body. A compressed air introduction part inserted and fixed, and a raw material supply pipe connected to the rear of the driving means are provided, and a plurality of discharge holes and a plurality of inclined holes inclined in the axial direction are provided on the outer periphery of the discharge valve body. , and provided with a plurality of non-penetrating grooves in the axial direction, and in a state where the discharge port of the outer cylinder nozzle is sealed by the discharge valve body, the raw material is press-fitted into the discharge valve body and the inner cylinder. The raw material is supplied via the compressed air that has flowed from the compressed air introduction portion through the flow path formed between the inner circumference of the outer cylinder and the outer circumference of the inner cylinder and flowed into the discharge valve body from the groove and the inclined hole. This is a raw material filling machine for foamed plastic that blows back to the tube side.

In the third aspect of the invention, the diameter of the discharge valve body is varied in a plurality of steps to form an outer peripheral annular stepped portion, and the inner periphery of the outer cylinder nozzle portion is varied in diameter in a plurality of steps to form an inner peripheral annular stepped portion. In the state described in claim 1, the outer peripheral annular stepped portion and the inner peripheral annular stepped portion are in contact with each other, and in the state described in claim 2, the outer peripheral annular stepped portion and the inner peripheral annular stepped portion The raw material filling machine for plastic foam according to claim 1 or 2, characterized in that the circumferential annular stepped portion is in a spaced state.

The invention according to claim 4 is characterized in that, in the state according to claim 2, the front end surface of the outer cylinder nozzle portion and the front end surface of the discharge valve body portion are substantially flush with each other. Alternatively, it is the raw material filling machine for foamed plastic according to claim 3 .

According to the invention of claim 5, in the state of claim 2, the front end surface of the outer cylinder nozzle portion and the front end surface of the discharge valve body portion are substantially on the same surface as the cavity side surface of the mold for molding plastic foam. The raw material filling machine for plastic foam according to any one of claims 1 to 4, characterized in that it has a single configuration.

According to the first aspect of the invention, when the raw material is charged, the raw material is discharged substantially horizontally with respect to the axial direction of the discharge valve body. Surface damage of the mold can be avoided.

According to the invention of claim 2, the minimum necessary amount of compressed air is emitted when filling the raw material, and at the time of blowback after filling the raw material, the compressed air from the inclined hole provided in the discharge valve body portion and another path Compressed air can be reduced because it is a structure in which compressed air from the groove is added.

According to the invention of claim 3, a sealing effect can be expected with a simple structure, and as a result, the discharge efficiency of the raw material at the time of charging the raw material is increased. In addition, compressed air can be guided to the groove during blowback.

According to the invention of claim 4 or 5, it is possible to form a foamed plastic molded article with good appearance.

FIG. 4 is a cross-sectional view of the present invention at a forward movement limit position (at the time of raw material filling); FIG. 2 is a partially enlarged cross-sectional view of FIG. 1 illustrating the flow of compressed air and raw material; FIG. 3 is a cross-sectional view taken along the line AA of FIG. 2; FIG. 4 is a cross-sectional view of the present invention at a rear movement limit position (at the time of blowback after completion of raw material filling); 5 is a partially enlarged cross-sectional view of FIG. 4 illustrating the flow of compressed air and raw material; FIG. FIG. 6 is a cross-sectional view taken along the line BB of FIG. 5; It is a side view of an outer cylinder nozzle part. FIG. 8 is a cross-sectional view of FIG. 7; It is a side view of a discharge valve body part. FIG. 10 is a cross-sectional view of FIG. 9; 1 is a schematic diagram of a configuration using the present invention during raw material filling; FIG. Fig. 2 is a schematic diagram of a configuration using the present invention during blowback; FIG. 2 is a schematic diagram of a main part using the present invention at the time of raw material filling; FIG. 4 is a schematic diagram of a main part using the present invention during blowback; FIG. 3 is a schematic diagram of the configuration of a mold using the present invention during heating and cooling; FIG. 4 is a schematic diagram of the configuration when releasing from a mold using the present invention; It is a schematic diagram at the time of raw material filling by the raw material filling machine of a conventional example. It is a schematic diagram at the time of blowback by the raw material filling machine of a conventional example.

In the present invention, raw material X (pre-expanded grains, etc.) for foamed plastic (molded product) 100 is filled into cavity 85 of mold 80 for foamed plastic molding via compressed air (pressurized gas) such as filling air. It is a raw material filling machine 1 for foamed plastic 100 for filling, and its main configuration is an outer cylinder body 10, an outer cylinder nozzle part 20, an inner cylinder body 30, a discharge valve body part 40, a compressed air introduction part 50, and a driving means. 60, a raw material supply pipe 70, and the like. Then, the raw material X press-fitted from the filling port 71 of the raw material supply pipe 70 is discharged via compressed air from the discharge hole 48 of the discharge valve body portion 40 protruding from the open discharge port 22a of the outer cylinder nozzle portion 20. It is a configuration that The cavity 85 is a space in the mold (male mold 81 and female mold 82) for filling the raw material X to form the foamed plastic 100, which is an injection-molded product.

Embodiments will be described below. The raw material X of the foamed plastic 100 is preferably in the form of beads, but may be in the form of straws or the like. For the sake of convenience, it will simply be referred to as "raw material X" hereinafter. The mold 80 for molding foamed plastic is hereinafter referred to simply as "mold 80", and the raw material filling machine 1 for foamed plastic is simply referred to as "raw material filling machine 1". Further, in the present invention, "front" indicates the discharge valve body portion 40 side, and "rear" indicates the raw material supply pipe 70 side. In the drawings, arrows may indicate the flow of compressed air.

The outer cylindrical body 10 is a hollow cylindrical body that accommodates an inner cylindrical body 30 that can move back and forth. The rear portion of the outer cylindrical body 10 is connected to the compressed air introduction portion 50 . Also, a fixture 15 for mounting the raw material filling machine 1 to the mold 80 is fitted to the outer periphery 13 .

An outer cylinder nozzle portion 20 is connected to the front end 10 a of the outer cylinder body 10 . Regarding the connection, any connection structure can be used. is desirable.

The outer cylinder nozzle part 20 is a cylindrical part connected to the outer cylinder body 10, and can be classified into a connecting part 21 and a body part 22 connected to the connecting part 21 (see FIGS. 7 and 8). The connecting portion 21 is positioned behind the outer cylinder nozzle portion 20 because it is a portion connected to the outer cylinder body 10 . For example, when the connecting portion 21 is configured to be screwed with the outer cylindrical body 10, the connecting portion 21 may be configured to have a screw groove as described above. The body portion 22 has a discharge port 22a that allows the discharge valve body portion 40 to appear and retract.

In addition, an inner peripheral annular stepped portion 23 is formed on the inner periphery 27 of the outer cylinder nozzle portion 20 . For example, the inner diameter of the outer cylinder nozzle portion 20 is varied in a plurality of stages. Specifically, the inner circumference 27 of the outer cylinder nozzle portion 20 is formed into a shape having at least two diameters, a small-diameter portion 27a and a large-diameter portion 27b, and the boundary between the small-diameter portion 27a and the large-diameter portion 27b is formed inside. A configuration using the circumferential annular stepped portion 23 may be mentioned. As the inner cylindrical body 30 moves back and forth within the outer cylindrical body 10 , the outer periphery 40 b of the protruding/retracting portion 46 of the discharge valve body portion 40 slides on the small diameter portion 27 a of the outer cylindrical nozzle portion 20 .

For the purpose of increasing the steam efficiency in the mold 80, etc., a slit 22b may be formed in the outer periphery 28 of the body portion 22 from the front end 10a side to the rear end side (connecting portion 21 side). The slit 22b is tapered, deep on the front end 10a side, and becomes shallower toward the rear end side. The number of slits 22b is not limited. In addition, in the case of a configuration in which the outer cylinder nozzle portion 20 is screwed to the front end 10a of the outer cylinder 10, the front end 10a of the outer cylinder 10 is tightened to tighten the outer cylinder nozzle portion 20 to the front end 10a of the outer cylinder 10. In order to attach and detach the outer cylinder nozzle portion 20 that is tightened, the main body portion may be provided with a recess (not shown) with which the tip of a tightening tool such as a spanner or wrench can be engaged.

A packing (not shown) is provided in the outer cylinder nozzle portion 20 in order to keep the inside of the outer cylinder 10 airtight. Specifically, a circumferential groove 21a for mounting the packing is formed in the boundary portion between the connecting portion 21 and the body portion 22, and the packing is fitted into the circumferential groove 21a.

The inner cylindrical body 30 is accommodated in the outer cylindrical body 10 so as to be movable back and forth, and the interior thereof serves as a raw material conveying path, and the raw material X is pressure-fed to the front end 30a side during raw material filling and to the rear end 30b side during blowback, which will be described later. The rear portion of the inner cylindrical body 30 is slidably inserted into the driving means 60 . Regarding the relationship between the inner cylindrical body 30 and the outer circumference 33 in the driving means 60, the inner cylindrical body 30 and the piston body 30 are fixed by fitting and fixing the piston body 65, which performs piston movement inside the driving means 60, to the inner cylindrical body 30. 65 are integrated. Therefore, when the piston body 65 moves forward, the inner cylindrical body 30 also moves forward, and when the piston body 65 moves backward, the inner cylindrical body 30 also moves backward. Furthermore, since the inside is used as the raw material conveying path, it communicates with the raw material supply pipe 70 .

A raw material supply pipe 70 is connected to the rear of the driving means 60, and the raw material supply pipe 70 and the inner cylindrical body 30 communicate with each other. , the rear end 30b of the inner cylindrical body 30 protrudes from the rear end of the driving means 60. As shown in FIG. In this manner, the rear portion of the inner cylindrical body 30 slides inside the raw material supply pipe 70 .

A discharge valve body portion 40 is connected to the front end 30a of the inner cylindrical body 30, which is the moving body (see FIGS. 9 and 10). The discharge valve body part 40 is a cylindrical part with an open bottom end, which is connected to the front end 30a of the inner cylindrical body 30, and has a ceiling. The parts can be classified into a continuous main body portion 42 and a retractable portion 46 continuous with the main body portion 42 .

Regarding the connection, any connection structure may be used. should be screwed together.

The connecting portion 41 is positioned at the rearmost portion of the discharge valve body portion 40 because it is a portion that connects with the inner cylindrical body 30 . For example, when the connecting portion 41 is configured to be screwed with the inner cylindrical body 30 , the connecting portion 41 may be formed with a screw groove as described above.

The body portion 42 is located between the connecting portion 41 and the retractable portion 46 , in other words, approximately halfway up the discharge valve body portion 40 . An outer circumferential annular stepped portion 43 is formed on the outer circumference 40 b of the discharge valve body portion 40 . For example, the outer diameter of the discharge valve body portion 40 is varied in a plurality of steps. The outer diameter of the body portion 42 is made larger than the outer diameter of the projected/retracted portion 46 to form a shape having at least two diameters. The structure to form is mentioned.

A plurality of inclined holes 45 inclined toward the axial direction are formed in the outer periphery 40 b of the body portion 42 . It is an inflow configuration. The shape, size, angle of inclination, and number of the inclined holes 45 do not matter. It is desirable that the number of inclined holes 45 is, for example, 6 to 10 at equal intervals in order to allow the filling air to flow uniformly.

The retractable portion 46 is located at the forefront of the discharge valve body portion 40 because it is a portion that appears and retracts (partially) from the discharge port 22 a that opens in the front end surface 25 of the outer cylinder nozzle portion 20 . A plurality of discharge holes 48 for discharging the raw material X by means of compressed air are formed in the side surface of the outer periphery 40b of the projection/retraction portion 46. As shown in FIG. The shape, size and number of the discharge holes 48 are not limited. When a plurality of discharge holes 48 are formed, the partition wall 42a remains between the discharge holes 48 and 48 .

Furthermore, the outer periphery 40b of the protruding/retracting portion 46 is provided with a plurality of non-penetrating grooves 47 in the axial direction (see FIG. 9, etc.). The groove 47 may have any shape other than a horizontally elongated elliptical shape as long as it is non-penetrating. Also, the depth and number of the grooves 47 are not limited, but the number is preferably about 2 to 3.

A packing (not shown) is provided in front of the discharge valve body portion 40 in order to keep the inside of the outer cylindrical body 10 airtight. Specifically, a circumferential groove 49 for mounting the packing is formed in front of the discharge valve body portion 40, and the packing is fitted into the circumferential groove 49. As shown in FIG.

The inner cylindrical body 30 is housed in the outer cylindrical body 10 so as to be movable back and forth, and the outer cylindrical body 10 and the inner cylindrical body 30 employ a double cylindrical structure. A flow path 35 is formed between the inner circumference 12 of the outer cylindrical body 10 and the outer circumference 33 of the inner cylindrical body 30, and compressed air from an air feeding means (not shown) passes through the compressed air introduction portion 50. It passes through this channel 35 . An air compressor, for example, is used as the air feeding means.

The driving means 60 moves the inner cylindrical body 30 inside the outer cylindrical body 10 back and forth. As the driving means 60, for example, an electric motor, a hydraulic cylinder, or the like can be used. However, since electric motors and hydraulic cylinders may require special devices such as complicated power supply devices and hydraulic pressure generators, it is desirable to use simple air cylinders. An example of the air cylinder will be described below.

The main components of the air cylinder are a main body 60a and a piston body 65 that moves back and forth in a chamber consisting of a forward air chamber 62 and a rearward air chamber 67 into which driving air pressure-fed from an air pressure feeding means such as an air compressor flows. and As shown in FIG. 2 and the like, the interior of the room has a front wall 68 at the front and a rear wall 63 at the rear. In addition, packings (not shown) are provided at respective sliding portions with the inner cylindrical body 30 and the piston body 65 in the main body 60a.

A rearward-moving air supply port 66 is formed on the front side of the driving means 60, and a forward-moving air supply port 61 is formed on the rear side thereof. That is, with respect to the piston body 65 which moves back and forth in the axial direction in the chamber, a rearward movement air supply port 66 is formed in front of the piston body 65, and a forward movement air supply port 61 is formed in rear side of the piston body 65. , the forward-moving air supply port 61 and the forward-moving air chamber 62 communicate with each other, and the backward-moving air supply port 66 and the backward-moving air chamber 67 communicate with each other.

A supply pipe for sending driving air from an air compressor is provided to a forward air supply port 61 and a rearward air supply port 66 for supplying driving air to a forward air chamber 62 and a rearward air chamber 67 in the main body. (not shown) is attached. Although the supply pipes are attached to the forward-moving air supply port 61 and the rearward-moving air supply port 66 in this manner, the supply pipes may be attached via an elbow (L-shaped pipe joint) or the like.

A compressed air introduction portion 50 is connected to the front of the drive means 60 . Specifically, the driving means 60 is connected to one side (rear side) of the compressed air introduction portion 50, and the rear side of the outer cylindrical body 10 is inserted and fixed to the other side (front side) of the compressed air introduction portion 50. there is That is, the outer cylindrical body 10, the compressed air introduction portion 50, and the drive means 60 are connected in the axial direction. If the drive means 60 and the compressed air introduction part 50 are separate members, any connection structure may be used for connection. Threading 60 is desirable.

A filling air supply port 52 is formed in the compressed air introduction portion 50 , and the filling air supply port 52 and the filling air chamber 54 communicate with each other. A filling air supply port 52 for supplying the filling air, which is compressed air, to the filling air chamber 54 in the compressed air introduction part 50 is provided with a filling air introduction pipe for sending the filling air from an air feeding means such as an air compressor. (not shown) is attached. Although the filling air introduction pipe is attached to the filling air supply port 52 in this manner, the material filling air introduction pipe may be attached via an elbow (L-shaped piping joint) or the like.

When drive air enters the forward air chamber 62 from the forward air supply port 61, the piston body 65 inside the main body 60a moves forward. Then, when the outer annular stepped portion 43 of the discharge valve body portion 40 and the inner annular stepped portion 23 of the outer cylinder nozzle portion 20 come into contact with each other, the forward movement of the piston body 65 is stopped, and this position is the internal position relative to the outer cylinder body 10 . The front movement limit position Y of the cylindrical body 30 is reached. At the forward movement limit position Y, a part of the protruding/retracting portion 46 protrudes from the open discharge port 22a of the front end face 25 of the outer cylinder nozzle portion 20 (see FIG. 1), which is the same as the state at the time of raw material filling. Become. When the raw material is charged, the inner cylindrical body 30 is at the forward movement limit position Y, and as will be described later, the outer circumferential annular stepped portion 43 of the discharge valve body portion 40 and the inner circumferential annular stepped portion 23 of the outer cylinder nozzle portion 20 come into contact with each other for sealing. state.

In the case of the forward motion limit position Y where the outer circumferential annular stepped portion 43 of the discharge valve body portion 40 and the inner circumferential annular stepped portion 23 of the outer cylinder nozzle portion 20 abut against each other, the front end surface of the piston body 65 inside the driving means 60 (inside the chamber) 65a and the front wall body 68 are not in contact with each other. Therefore, a slight clearance 69 is formed between the front end face 65a of the piston body 65 and the front wall body 68 at the forward movement limit position Y of the inner cylindrical body 30 (see FIG. 1).

The piston body 65 inside (inside) the main body 60a moves backward when the driving air enters the trailing air chamber 67 from the trailing air supply port 66 . When the rear end surface 65b of the piston body 65 inside the driving means 60 comes into contact with the rear wall body 63, the rearward movement of the piston body 65 is stopped. Position Z. At the rear movement limit position Z, the front end surface 25 of the outer cylinder nozzle portion 20 and the front end surface 44 of the discharge valve body portion 40 are substantially flush with each other (see FIG. 4). At the rear movement limit position Z, the outer annular stepped portion 43 of the discharge valve body portion 40 and the inner annular stepped portion 23 of the outer cylinder nozzle portion 20 are separated from each other.

Molding of the foamed plastic 100 according to the present invention is performed by filling the raw material X into the cavity 85 of the mold 80 by injection (injection) action using the present invention, and then steam-heating and cooling the mold 80 to form the foamed plastic. Complete 100. A process of molding the foamed plastic 100 using the present invention will be described. FIG. 11 shows the charging of the raw material X, and FIG. 12 shows the blowing back after the filling of the raw material X is completed. These FIGS. 11 and 12 show, in addition to the present invention, an outline of each configuration such as a hopper 90 containing raw material X, a mold 80 filled with raw material X, and the like.

First, an example of attachment to the mold 80 (for example, the female mold 82) of the present invention will be described. The outer cylindrical body 10 is inserted into the female mold 82 from the back surface 82a of the female mold 82, and the outer cylinder nozzle portion 20 is attached to the raw material filling port 83 communicating with the cavity 85 on the female mold 82 side. Then, the present invention is attached to the female die 82 via the fixture 15 fitted to the outer circumference 13 of the outer cylindrical body 10 . This completes the attachment of the present invention to female mold 82 . When the outer cylinder nozzle portion 20 is attached to the raw material filling port 83 of the female mold 82, the front end surface 25 of the outer cylinder nozzle portion 20 and the surface 82b of the female mold 82 (the surface on the cavity 85 side) are substantially flush with each other. is desirable. In the case of the male mold 81, it is desirable that the front end surface 25 of the outer cylinder nozzle portion 20 and the surface 81b of the male mold 81 are substantially flush with each other.

After the mold 80 is mounted, the raw material filling machine 1 is placed in the initial state, that is, the inner cylindrical body 30 is moved forward by supplying driving air to the forward movement air chamber 62 of the driving means 60, and the discharge valve body portion 40 appears and retracts. A part of the portion 46 projects forward from the front end surface 25 of the outer cylinder nozzle portion 20 (see FIG. 1). In this case, the internal state of the outer cylinder nozzle portion 20 and the discharge valve body portion 40 is such that the outer circumferential annular stepped portion 43 of the discharge valve body portion 40 and the inner circumferential annular stepped portion 23 of the outer cylinder nozzle portion 20 are in contact with each other. In other words, it is in a pressurized sealing state. At this point, the piston body 65 in the chamber and the inner cylindrical body 30 fitted to the piston body 65 are at the forward movement limit position Y. As shown in FIG.

With the inner cylindrical body 30 at the forward movement limit position Y, that is, with a part of the retractable portion 46 of the discharge valve body portion 40 protruding forward from the front end surface 25 of the outer cylinder nozzle portion 20, the air compressor (not shown) is operated. ) into the hopper 90 .

A pressurization valve 91 is provided between the air compressor and the hopper 90, and the flow of the material X from the hopper 90 is opened by turning on the pressurization valve 91, and a predetermined When pressure is applied, the raw material is press-fitted and supplied from the hopper 90 through the raw material supply hose 75 and the like into the raw material supply pipe 70, the inner cylindrical body 30, and the discharge valve body portion 40 of the present invention. Naturally, an exhaust valve 92 for reducing the pressurization in the hopper 90 is also connected to the hopper 90, and is closed by turning off the exhaust valve 92 when the raw material X is filled. .

After the raw material X is supplied into the inner cylindrical body 30 and the discharge valve body portion 40, filling of filling air, which is compressed air, is started. The flow of charged air from the air compressor flows through the gap between the inner periphery 12 of the outer cylindrical body 10 and the outer periphery 33 of the inner cylindrical body 30 through the charged air supply port 52 and the charged air chamber 54 of the compressed air introduction portion 50 of the present invention. It flows into the intermediate channel 35 and passes through this channel 35 . At the time of raw material filling, since the outer circumferential annular stepped portion 43 of the discharge valve body portion 40 and the inner circumferential annular stepped portion 23 of the outer cylinder nozzle portion 20 are in a sealing state in contact, the filling air flows into the discharge valve body portion 40. It flows into the discharge valve body portion 40 through an inclined hole 45 bored in the main body portion 42 . At this point, the charging air flows into the discharge valve body portion 40 only from the inclined hole 45 . Then, the raw material X is discharged via compressed air from the discharge hole 48 of the discharge valve body portion 40 protruding from the discharge port 22a of the outer cylinder nozzle portion 20 (see FIG. 2).

As shown in FIG. 2, the charging air flowing in from the inclined hole 45 advances in the direction of the dashed line (axial direction), and the discharge valve partially protrudes from the front end face 25 of the outer cylinder nozzle portion 20. It is discharged together with the raw material X from the discharge hole 48 of the retractable portion 46 of the body portion 40 . As described above, in the present invention, the raw material X is discharged from the discharge hole 48 formed in the side surface of the outer periphery 40b of the retractable portion 46 of the discharge valve body portion 40. As shown in FIG. That is, the raw material X is discharged from the side surface of the discharge valve body portion 40 in the axial direction through the filling air.

In the case of the conventional raw material filling machine E shown in FIG. 17, since the filling port C1 for discharging the raw material X is provided at the front end, the raw material X is discharged substantially perpendicularly to the axial direction. However, in the case of the raw material filling machine 1 of the present invention, since the discharge hole 48 is bored in the side surface of the discharge valve body portion 40 with respect to the axial direction, the raw material X is discharged substantially horizontally with respect to the axial direction.

As described above, the cavity 85 formed by the male mold 81 and the female mold 82 is gradually filled with the raw material from the thickness direction of the foamed plastic 100 (see FIG. 13, etc.) via the filling air. complete.

After the filling of the raw material X is completed, the air compressor 90 is stopped from injecting air into the hopper 90, the pressurization valve 91 is turned off to close it, and the exhaust valve 92 is turned on. The valve is opened by , and the pressure inside the hopper 90 is thereby brought to atmospheric pressure. As a result, the injection supply of the raw material X from the hopper 90 is stopped.

Next, driving air is supplied from an air feeding means such as an air compressor to the rearward movement air supply port 66 of the air cylinder and the rearward movement air chamber 67 in the air cylinder communicating with the rearward movement air supply port 66, and the piston body 65 and the piston in the air cylinder are supplied. The inner cylindrical body 30 fitted to the body 65 moves to the rear movement limit position Z. As a result, the discharge valve body portion 40 at the front end 30 a of the inner cylinder 30 seals (closes) the open discharge port 22 a of the outer cylinder nozzle portion 20 at the front end 10 a of the outer cylinder 10 . At the rearward movement limit position Z of the inner cylinder 30 with respect to the outer cylinder 10, the front end surface 25 of the outer cylinder nozzle portion 20 and the front end surface 44 of the discharge valve body portion 40 are aligned with the surface of the mold 80 on the cavity 85 side ( It is desirable that the surface 82b) or the surface (surface 81b) on the side of the core 86 be substantially flush with each other.

When the inner cylindrical body 30 is at the rear movement limit position Z with respect to the outer cylindrical body 10, the discharge port 22a of the outer cylindrical body 10 is sealed (closed) by the discharge valve body portion 40, so the raw material X is Needless to say, the charging air is also not discharged from the discharge port 22a. If the filling air continues to be filled from the filling air supply port 52 in this state, the filling air makes a U-turn and flows backward through the discharge valve body portion 40 and the inner cylinder 30. The raw material X remaining in the body 30 is blown back into the hopper 90 together with the raw material X in the raw material supply hose 75 by the U-turned filling air flow (see FIGS. 12 and 14). ). This blowback will be explained mainly based on the internal structure.

The positional relationship between the inclined hole 45 and the groove 47 inside the outer cylinder nozzle portion 20 when the inner cylinder 30 is at the rear movement limit position Z with respect to the outer cylinder 10 will be described. 20 facing the large diameter portion 27b. A portion of the groove 47 of the discharge valve body portion 40 (rear end side) faces the large diameter portion 27b, and a portion of the groove 47 of the discharge valve body portion 40 (front end side) faces the outer cylinder nozzle. It faces a small diameter portion 27a in the portion 20. As shown in FIG.

Due to the positional relationship as described above, the charging air that has passed through the flow path 35 and flowed from the inclined hole 45 facing the large diameter portion 27b flows into the discharge valve body portion 40 and is blown back to the inner cylindrical body 30. (see Figure 5). Also, the filling air that has passed through the flow path 35 and the outer periphery 40b of the main body portion 42 of the discharge valve body portion 40 flows from a portion (rear end side) of the groove 47 facing the large diameter portion 27b to the small diameter portion 27a. It passes through a part (front end side) of the groove 47 , furthermore flows into the discharge valve body portion 40 from the discharge hole 48 of the protruding and recessed portion 46 of the discharge valve body portion 40 , the inner cylindrical body 30 and the raw material supply pipe 70 . Blowback to the side.

As described above, excess raw material X inside the discharge valve body portion 40, the inner cylindrical body 30, the raw material supply pipe 70, the raw material supply hose 75, and the like is blown back to the hopper 90 by the back-flowing filling air.

Then, by heating and cooling the inside of the mold 80, a molded product of the foamed plastic 100 is formed. FIG. 15 illustrates heating and cooling of the mold 80 after filling the raw material.

After the foamed plastic 100 molded product is molded, the foamed plastic 100 molded product is released from the mold 80 as shown in FIG. In the present invention attached to the female mold 82, the discharge valve body 40 can be retracted from the open discharge port 22a of the outer cylinder nozzle part 20 as in the case of filling the raw material. Mold 80 can be released from mold 80 by extruding 100 molded articles. Therefore, the discharge valve body portion 40 of the present invention also serves as an eject pin for the foamed plastic 100 molding.

As a method of filling the material X from the hopper 90, there are mainly atmospheric pressure filling in which filling is performed by injecting air pressure from the hopper 90 under atmospheric pressure, and constant pressure is applied from the pressurizable tank-like hopper 90. There are two types of pressure filling for filling, but in recent years, pressure filling has become mainstream because it takes a short time to fill raw materials and has good filling efficiency for details.

However, in the case of pressurized filling, when the remaining raw material X is returned to the hopper 90 after the filling of the raw material X into the mold 80 is completed, the volume of the tank-shaped hopper 90 is small and it is difficult to sufficiently remove the exhaust gas. Also, in the raw material filling machine E of the conventional example, the filling air outlet C2 (see FIG. 17) and the blowback air outlet C2 (see FIG. 18) are the same outlet (air blowing hole) C2, so The amount of charging air must be increased not for charging the raw material X but for increasing the momentum of the blowback, which may be double the amount required at the time of charging the raw material.

In this regard, in the raw material filling machine 1 of the present invention, after the raw material filling is completed, the discharge valve body portion 40 moves backward, and in addition to the air used at the time of raw material filling, the inclined hole 45 provided in the discharge valve body portion 40 and another Filled air flows into the discharge valve body 40 and the inner cylindrical body 30 through the two grooves 47 serving as paths, and the surplus material can be returned to the tank-shaped hopper 90 . That is, the outer periphery 40b of the protruding portion 46 is provided with an axially non-penetrating groove 47 as an inlet of filling air for blowback, in addition to the inclined hole 45 which is an inlet of filling air at the time of raw material filling. , the blowback can be done with charging air from two inlets. Therefore, compared with the conventional raw material filling machine E, the amount of filling air used in the filling process can be greatly reduced, resulting in reduction of compressed air.

In the conventional raw material filling machine E (see FIGS. 17 and 18) having a structure other than the structure in which the discharge valve element 40 emerges and retracts from the outer cylinder nozzle portion 20 as in the present invention, the mold 80 is filled immediately after the raw material filling. Overfilling of the raw material in the filling port C1 portion where the raw material X is filled, that is, a “dense state C (see FIG. 18)” in which the density is abnormally high occurs, and the vapor permeability of the mold 80 deteriorates with respect to that portion. Due to insufficient heating and insufficient cooling due to the high density of the raw material X, the molded product of the foamed plastic 100 may become defective.

However, in the present invention, the discharge valve body portion 40 protrudes into the thickness of the foamed plastic 100 molded product at the time of filling the raw material, but when the filling of the raw material X is completed, the discharge valve body portion 40 is discharged to the outer surface (back surface) of the foamed plastic 100 molded product. Since the valve body part 40 is immersed, the filling density of the raw material in the portion where the discharge valve body part 40 was is low, and the raw material is in a "sparse state S (see FIG. 5)". By supplementing the raw material from the relatively high filling density portion near the state S to the sparse state S portion, the density of the foamed plastic 100 molded product is evened out, and the product does not become a defective product.

Although the present invention has been described above based on each embodiment, the present invention is not limited to the above-described embodiments, and modifications may be made without departing from the scope of the present invention. You may make it combine the technique described in a form, or another well-known or well-known technique.

In addition, although each drawing shows each embodiment, the present invention is limited only to the illustrated embodiments because some configurations are omitted, simplified, and transparent for the sake of easy understanding of the drawings. not to be

The "connection" described in each embodiment may be interposed by another member, or may be integrally formed. Specifically, the outer cylinder body 10 and the outer cylinder nozzle portion 20, the inner cylinder body 30 and the discharge valve body portion 40, the drive means 60 and the compressed air introduction portion 50, the drive means 60 and the raw material supply pipe 70 are integrally formed. may

Even if the inner diameter of the outer cylinder nozzle portion 20 is not varied in a plurality of steps, the inner circumference annular stepped portion can be provided by providing a convex portion or the like, or by interposing a separate member or the like on the inner circumference 27 of the outer cylinder nozzle portion 20. A stepped portion having the same effect as 23 may be formed. In addition, the same effect as that of the outer peripheral annular stepped portion 43 can be obtained by providing a convex portion or the like instead of making the outer diameter of the main body portion 42 larger than the outer diameter of the retractable portion 46, or by interposing a separate member or the like on the outer peripheral portion 40b. You may form the stepped part which plays.

1: Raw material filling machine for foamed plastic (raw material filling machine)
10: Outer cylinder 10a: Front end 12: Inner periphery 13: Outer periphery 15: Mounting tool 20: Outer cylinder nozzle part 21: Connecting part 21a: Circumferential groove 22: Body part 22a: Discharge port 22b: Slit 23: Inner circumference annular step Part 25: Front end surface 27: Inner circumference 27a: Small diameter part 27b: Large diameter part 28: Outer circumference 30: Inner cylindrical body 30a: Front end 30b: Rear end 32: Inner circumference 33: Outer circumference 35: Flow path 40: Discharge valve body part 40b: outer periphery 41: connecting portion 42: main body portion 42a: partition wall 43: outer peripheral annular stepped portion 44: front end surface 45: inclined hole 46: protruding portion 47: groove 48: discharge hole 49: peripheral groove 50: compressed air introduction portion 52 : Filling air supply port 54: Filling air chamber 60: Driving means 60a: Main body 61: Forward air supply port 62: Forward air chamber 63: Rear wall 65: Piston body 65a: Front end surface 65b: Rear end surface 66: Rear Moving air supply port 67: Backward moving air chamber 68: Front wall body 69: Clearance 70: Raw material supply pipe 71: Filling port 75: Raw material supply hose 80: Foamed plastic molding mold (mold)
81: male mold 81b: front surface 82: female mold 82a: back surface 82b: front surface 83: raw material filling port 85: cavity 90: hopper 91: pressure valve 92: exhaust valve 100: plastic foam (molded product)
C: dense state C1: filling port C2: outlet E: conventional raw material filling machine S: sparse state X: raw material of plastic foam (raw material)
Y: Forward movement limit position Z: Backward movement limit position

Claims (5)

A raw material filling machine for foam plastic that fills a raw material into a cavity of a mold for molding foamed plastic via compressed air,
an outer cylindrical body having a front end connected to an outer cylindrical nozzle portion having a discharge port;
an inner cylindrical body that is housed in the outer cylindrical body so as to be movable back and forth, and that has a front end connected to a discharge valve body portion that can be retracted from the discharge port of the outer cylindrical nozzle portion;
a driving means for moving back and forth the inner cylindrical body which is slidably inserted in the rear of the inner cylindrical body and in which a piston body that performs piston movement is fitted and fixed;
a compressed air introduction part having one side connected to the front of the driving means and the other side inserted and fixed to the rear of the outer cylindrical body;
a raw material supply pipe connected to the rear of the driving means,
A plurality of discharge holes and a plurality of inclined holes inclined in the axial direction are bored in the outer periphery of the discharge valve body,
The raw material press-fitted and supplied from the raw material supply pipe into the inner cylindrical body and the discharge valve body forms a flow from the compressed air introduction portion between the outer circumference of the outer cylinder and the outer circumference of the inner cylinder. From the discharge hole of the discharge valve body projecting from the discharge port of the outer cylinder nozzle through the compressed air that passes through the passage and flows into the discharge valve body from the inclined hole. A raw material filling machine for foamed plastics with a discharge configuration.
A raw material filling machine for foam plastic that fills a raw material into a cavity of a mold for molding foamed plastic via compressed air,
an outer cylindrical body having a front end connected to an outer cylindrical nozzle portion having a discharge port;
an inner cylindrical body that is housed in the outer cylindrical body so as to be movable back and forth, and that has a front end connected to a discharge valve body portion that can be retracted from the discharge port of the outer cylindrical nozzle portion;
a driving means for moving back and forth the inner cylindrical body which is slidably inserted in the rear of the inner cylindrical body and in which a piston body that performs piston movement is fitted and fixed;
a compressed air introduction part having one side connected to the front of the driving means and the other side inserted and fixed to the rear of the outer cylindrical body;
a raw material supply pipe connected to the rear of the driving means,
A plurality of discharge holes and a plurality of inclined holes inclined in the axial direction are formed in the outer periphery of the discharge valve body portion, and a plurality of non-penetrating grooves are provided in the axial direction,
In a state in which the discharge port of the outer cylinder nozzle portion is sealed by the discharge valve body portion,
the raw material press-fitted into the discharge valve body portion and the inner cylindrical body passes from the compressed air introduction portion through a flow path formed between the inner periphery of the outer cylinder and the outer periphery of the inner cylinder; A raw material filling machine for plastic foam, wherein the compressed air flowing into the discharge valve body through the groove and the inclined hole is blown back toward the raw material supply pipe.
forming an outer peripheral annular stepped portion with a plurality of different diameters on the outer periphery of the discharge valve body;
forming an inner circumferential annular stepped portion by varying the diameter in a plurality of steps on the inner circumference of the outer cylinder nozzle portion;
In the state according to claim 1, the outer annular stepped portion and the inner annular stepped portion are in contact with each other,
In the state described in claim 2, the outer peripheral annular stepped portion and the inner peripheral annular stepped portion are separated from each other. machine.
In the state according to claim 2, the front end surface of the outer cylinder nozzle portion and the front end surface of the discharge valve body portion are substantially flush with each other. The raw material filling machine for foamed plastic described in .
In the state according to claim 2, the front end surface of the outer cylinder nozzle portion and the front end surface of the discharge valve body portion are substantially flush with the cavity-side surface of the plastic foam molding mold. The raw material filling machine for plastic foam according to any one of claims 1 to 4, characterized in that:

Images