Nozzle and rubber injection machine equipped with said nozzle

Abstract

To provide a nozzle which in beforehand reduces the probability that oscillation of a piston part is hindered by rubber.SOLUTION: Provided is a nozzle 30 and a rubber injection machine 20 comprising the nozzle 30. In the nozzle, when rubber is injected, a blade part 35 is pressed in a direction of a housing part 38 according to the force of pressing the blade part 35 in the housing part 38 direction that arises from pressure of the rubber, since a third piston part 34c is formed to be narrower than a second piston part 34b. Further, as the force increases according to the energization force of an energization member 40, the piston part 34 moves in the housing part 38 direction, and the blade part 35 closes an open hole 39 by abutting on a wall surface of the housing part 38, so that an injection port 36 is set to an open state whereas the open hole 39 is closed by the blade part 35. Thus, the probability is reduced that rubber intrudes into the housing part 38 from a gap between the piston part 34 and the open hole 39.SELECTED DRAWING: Figure 2

Description

[Technical field]

[0001] The present invention relates to a nozzle and a rubber injection machine equipped with the nozzle. [Background technology]

[0002] Conventionally, there are known valve nozzles with improved maintainability. For example, Patent Document 1 describes a valve nozzle in which a gate opening / closing mechanism is provided in the internal space of a valve nozzle body, the gate opening / closing mechanism being configured by integrally assembling a piston having a head portion and a shaft portion, a torpedo disposed in the internal space of a nozzle head, slidably supporting the piston and serving as a guide for the piston, and having a concave groove formed on its outer circumferential surface with a twist in the resin injection direction and serving as a plurality of rotating resin flow paths, a coil spring that biases the piston toward the gate, and a cover that closes the rear end of the torpedo and serves as a spring receiving portion for the coil spring, and when the resin pressure is below a certain value, the entire circumference of the circular cross section of the head portion of the piston abuts against the inner wall of the gate of the nozzle head to close the resin flow path, and when the resin pressure is above a certain value, the head portion retracts from the gate to open it. This valve nozzle has a gate opening and closing mechanism comprised of a piston, torpedo, coil spring, and cover integrally assembled and disposed in the internal space of the valve nozzle body, which comprises a nozzle holder and a nozzle head attached to the tip of the nozzle holder. Therefore, during maintenance, the entire gate opening and closing mechanism can be removed at once by removing the nozzle head, improving maintainability. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] JP 2005-246951 A Summary of the Invention [Problem to be solved by the invention]

[0004] However, with the valve nozzle described in Patent Document 1, when resin is injected, there is a problem that the resin to be injected due to the resin pressure may enter the inside of the torpedo through the gap between the torpedo and the piston, and if the resin enters the inside of the torpedo, it may interfere with the oscillation of the piston caused by the biasing force of the coil spring.

[0005] The present invention has been made in consideration of the above problems, and has as its main object to provide a nozzle that can reduce the possibility that the oscillation of the piston part will be hindered by resin, and also to provide a rubber injection machine equipped with this nozzle. [Means for solving the problem]

[0006] In order to achieve at least one of the above objects, the present invention employs the following means.

[0007] The nozzle of the present invention comprises: An injection port from which rubber is injected; A rubber supply path through which the rubber is supplied; a piston portion including a first piston portion, a second piston portion connected to the other end side of the first piston portion, and a third piston portion connected to the other end side of the second piston portion and thinner than the second piston portion, the piston portion swinging in a direction toward or away from the injection port to open and close the injection port; A wing portion provided on a side surface of the piston portion; a biasing member that biases the piston portion toward the injection port; a housing portion having a through hole through which a portion of the piston portion passes and housing the biasing member and at least a portion of the piston portion; Equipped with The wing portion closes the through hole when the injection port is in an open state. It is something.

[0008] This nozzle includes a piston portion that opens or closes the ejection port through which the rubber is ejected, and a housing portion that houses at least a part of the piston portion and a biasing member that biases the piston portion toward the ejection port. The piston portion is composed of a first piston portion, a second piston portion that is connected to the other end side of the first piston portion, and a third piston portion that is connected to the other end side of the second piston portion and is thinner than the second piston portion, and swings toward or away from the ejection port. When the pressure of the rubber in the nozzle is low, the piston portion is biased toward the ejection port by the biasing force of the biasing member, and the piston portion blocks the ejection port to be in a closed state. In this way, the ejection port is closed by the piston portion except when the rubber is ejected, so that the possibility of the rubber leaking from the ejection port can be reduced. On the other hand, when the pressure of the rubber in the nozzle increases, since the third piston portion is thinner than the second piston portion, a force is generated that presses the piston portion toward the housing portion due to the pressure of the rubber around the piston portion. When this force becomes stronger than the biasing force of the biasing member, the piston part moves toward the housing part due to this force, and the ejection port is opened and in an open state. At this time, since the side surface of the piston part is provided with a wing part that blocks the through hole, when the pressure of the rubber in the nozzle increases during the ejection of the rubber, the piston part moves toward the housing part and the through hole is blocked by the wing part. This can reduce the possibility that the rubber will enter the inside of the housing part through the gap between the through hole and the piston part. In addition, it can reduce the possibility that the rubber will enter the inside of the housing part and get entangled with the biasing member, thereby hindering the oscillation of the piston part. Note that the "other end side" here means the side of the first piston part or the second piston part that is closer to the ejection port 36.

[0009] In the nozzle of the present invention, the through hole may be provided with an O-ring, which can reduce the possibility that rubber will enter the housing through a gap between the through hole and the piston and become entangled with the biasing member, thereby preventing the piston from swinging.

[0010] In the nozzle of the present invention, the wing portion may be characterized in that, when the ejection port is in an open state, it comes into contact with the vicinity of the through hole. When the ejection port is in an open state, rubber is present around the piston portion under high pressure. At this time, when the wing portion comes into contact with the vicinity of the through hole, the wing portion is pressed against the surface of the storage portion by the pressure of the rubber, so that the vicinity of the through hole and the wing portion come into close contact with each other, and the possibility of the rubber penetrating into the gap between the piston portion and the through hole can be further reduced. In addition, the rubber can be prevented from penetrating into the interior of the storage portion and becoming entangled with the biasing member, thereby reducing the possibility of the penetrating rubber impeding the oscillation of the piston portion.

[0011] The rubber injection machine of the present invention comprises: Any of the nozzles described above; a rubber extruder for supplying rubber to the nozzle; The present invention is characterized in that it comprises It is something.

[0012] This rubber injection machine is equipped with any one of the nozzles described above and a rubber extruder that supplies rubber to the nozzle. Since the rubber injection machine equipped with the nozzle of the present invention can reduce the possibility that the rubber that has entered the nozzle will interfere with the oscillation of the piston, the rubber injection machine equipped with the nozzle can also obtain the same effect. [Brief description of the drawings]

[0013] [Figure 1] FIG. 1 is an overall view showing the outline of the configuration of a rubber injection machine 20. As shown in FIG. [Diagram 2] FIG. 2 is an explanatory diagram showing the outline of the configuration of the nozzle 30 in a closed state. [Diagram 3] FIG. 3 is an explanatory diagram showing the outline of the configuration of the nozzle 30 in an open state. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0014] Next, the rubber injection machine 20 will be described in detail as an example of an embodiment of the present invention. The embodiments and drawings described below are intended to illustrate a part of the embodiment of the present invention, and are not intended to limit the present invention to these configurations. Appropriate modifications can be made without departing from the gist of the present invention. In addition, the same or similar reference numerals are used to designate corresponding components in each drawing. In addition, an example of a method of using the rubber injection machine 20 will be shown to clarify an example of a method of using the rubber injection machine of the present invention.

[0015] As shown in FIG. 1, a rubber injection machine 20, which is an example of an embodiment of the present invention, is heated and pre-plasticized in a rubber extruder 22 to increase the flowability, and is then supplied to an injection chamber (not shown). The rubber injected from the injection chamber is supplied to a molding die (not shown) through a nozzle 30. As shown in FIG. 2, the nozzle 30 includes a rubber supply passage 32 through which the rubber is supplied, an injection port 36 from which the rubber is injected, and a housing section 38 that houses a part of a piston section 34 and a biasing member 40 that biases the piston section 34 toward the injection port 36. When the injection port 36 is closed, the piston section 34 is biased toward the injection port 36 by the biasing force of the biasing member 40, and closes the injection port 36. This can reduce the possibility of rubber leaking from the injection port 36 when rubber is not being injected from the injection port 36. Meanwhile, when the rubber is injected, if the pressure of the rubber supplied through the rubber supply passage 32 increases, the force pressing the piston portion 34 toward the housing portion 38 becomes stronger than the biasing force of the biasing member 40, and the piston portion 34 is pressed toward the housing portion 38. This makes it possible to prevent the wing portions 35 provided on the piston portion 34 from abutting against the wall surface of the housing portion 38 and covering the through-hole 39, causing the rubber to enter the housing portion 38 and preventing the biasing member 40 provided inside the housing portion 38 from oscillating the piston portion 34.

[0016] As shown in FIG. 1, the rubber extruder 22 is a device for extruding heated rubber into the rubber injector 20, and is a known rubber extruder that supplies rubber heated by a heating means (not shown) to an injection chamber (not shown). When ribbonized rubber is supplied to the rubber extruder 22, the rubber extruder kneads and heats it to pre-plasticize it and supply it to the injection chamber (not shown) in a state of increased fluidity. When the rubber is injected from the injection chamber, the rubber passes through the rubber supply path 32 and is supplied to a molding die (not shown) through the nozzle 30. At this time, the rubber supply path 32 is provided so as to penetrate the inside of the outer wall of the housing section 38 from the injection chamber side (not shown) to the injection port 36 side (from the upper side to the lower side in FIG. 2). The extrusion of rubber in the rubber extruder 22 and the temperature control of the heating means are controlled by a control means (not shown). The control method can be controlled using various known control methods, so a description thereof will be omitted here.

[0017] As shown in Fig. 2, the nozzle 30 includes an injection port 36 for injecting rubber, a rubber supply passage 32 which is a flow path for rubber injected from an injection chamber (not shown), a piston portion 34 which swings toward or away from the injection port 36, a biasing member 40 which biases the piston portion 34 toward the injection port 36, and a housing portion 38 which accommodates a part of the piston portion 34 and the biasing member 40. When rubber is not injected from the injection port 36, the other end side (the injection port 36 side) of the piston portion 34 is biased toward the injection port 36 by the biasing member 40, and the piston portion 34 abuts against the injection port 36 to block the injection port 36 and close the injection port. This can reduce the possibility of rubber leaking from the injection port 36 when rubber is not being injected.

[0018] On the other hand, as shown in FIG. 3, when the rubber is injected from the injection port 36, the pressure of the rubber becomes stronger than the biasing force of the biasing member 40, and the piston part 34 is pushed in a direction away from the injection port 36 by the pressure of the rubber, the injection port 36 is opened, and the rubber is injected. On the other hand, when the rubber is injected, the pressure of the rubber decreases, so that the biasing force of the biasing member 40 becomes stronger than the pressure of the rubber again, and the piston part 34 is biased in a direction approaching the injection port 36, and the piston part 34 and the injection port 36 come into contact with each other and are in a closed state. In this way, the rubber whose fluidity has been increased by heating in the rubber extruder 22 is injected from an injection chamber (not shown) and supplied to a molding die (not shown) through the nozzle 30. In addition, after the rubber is injected, the piston part 34 closes the injection port 36 by being biased by the biasing member 40, and the possibility of the rubber leaking from the injection port can be reduced in advance.

[0019] The piston portion 34 is composed of a columnar first piston portion 34a, a columnar second piston portion 34b connected to the other end side (the injection hole 36 side) of the first piston portion 34a, and a columnar third piston portion 34c connected to the other end side of the second piston portion 34b and thinner than the second piston portion 34b. A wing portion 35 protruding to the side surface is provided at the boundary position between the second piston portion 34b and the third piston portion 34c. The boundary position between the second piston portion 34b and the third piston portion 34c is also the position where the wing portion 35 abuts against the wall surface of the storage portion 38 and covers the through hole 39 when the piston portion 34 is farthest from the injection hole 36. The piston portion 34 is biased toward the injection hole 36 by a biasing member 40 attached to the side surface of the first piston portion 34a, and a part of the first piston portion 34a and the second piston portion 34b pass through the through hole 39 and swing. At this time, the wing portion 35 provided at the boundary between the second piston portion 34b and the second piston portion 34c is provided at a position where it comes into contact with the wall surface of the storage portion 38 and covers the through hole 39 when the piston portion 34 moves to a position away from the injection port 36 and injects rubber from the injection port 36, so that the wing portion 35 comes into contact with the wall surface of the storage portion 38 and covers the through hole 39. This makes it possible to prevent the rubber from passing through the through hole 39 and entering the storage portion 38 when the rubber is injected, thereby preventing the biasing member 40 provided inside the storage portion 38 from interfering with the rocking of the piston portion 34.

[0020] The wing portion 35 is a metal member having a truncated cone shape, and is formed so that the diameter on the housing portion 38 side is larger than the diameter of the through hole 39. The wing portion 35 is provided at the boundary position between the second piston portion 34b and the third piston portion 34c, and this boundary position is also the position where the wing portion 35 abuts against the wall surface of the housing portion 38 and covers the through hole 39 when the piston portion 34 is farthest from the injection hole 36. Therefore, when the piston portion 34 is farthest from the injection hole 36, the surface of the wing portion 35 on the housing portion 38 side is pressed against the surface of the housing portion 38 on the injection hole 35 side in a state where it covers the through hole 39. In this way, the gap between the through hole 39 and the piston portion 34 is blocked by the wing portion 35, and the possibility of rubber entering the housing portion 38 from the gap between the through hole 39 and the piston portion 34 can be reduced in advance. In addition, it is possible to prevent rubber from entering the accommodating portion 38 through the gap between the piston portion 34 and the through hole 39, thereby reducing the possibility that the biasing member 40 provided inside the accommodating portion 38 will hinder the piston portion 34 from swinging.

[0021] The injection port 36 is an injection port having a flow path in a substantially truncated cone shape provided at the tip of the nozzle 30, and injects the rubber supplied via the rubber supply path 32 to supply the rubber to a molding die (not shown). This injection port 36 has a truncated cone shape that narrows as it approaches the injection port 36, and when the piston portion 34 is urged toward the injection port 36 by the urging member 40, the other end side of the piston portion 34 comes into contact with the injection port 36, and the injection port 36 is closed. In this way, when rubber is not being injected, the injection port 36 is closed by the piston portion 34, and the possibility of rubber leaking out from the injection port 36 can be reduced in advance.

[0022] The housing portion 38 has a through hole 39 on the side surface on the injection port 36 side, houses a part of the piston portion 34 provided at a position passing through the through hole 39, and biases the piston portion 34 toward the injection port 36 by a biasing member 40 provided inside the housing portion 38. The diameter of the through hole 39 is formed to be substantially the same as the diameter of the piston portion 34, and when the piston portion 34 swings, it can swing along the inner surface of the through hole 39. In addition, since an O-ring 34d is provided in the through hole 39, it is possible to prevent rubber from entering the housing portion 38 through a gap between the through hole 39 and the piston portion 34. In addition, it is possible to prevent rubber from entering the housing portion 38 through a gap between the piston portion 34 and the through hole 39, and to prevent the biasing member 40 provided inside the housing portion 38 from swinging the piston portion 34.

[0023] The biasing member 40 is, for example, a known biasing member (for example, various springs such as a coil spring, an elastic body, etc.), which is disposed along the side surface of the piston portion 34 and fixed to the piston portion 34. In addition, one end side is fixed to the inner surface of the storage portion 38, and biases the piston portion 34 in the direction of the injection port 36. In this way, when rubber is not being injected, the piston portion 34 abuts against the injection port 36, closing the injection port 36, thereby reducing the possibility of rubber leaking from the injection port 36.

[0024] Next, the movement of rubber when it is injected from the nozzle 30 (opening and closing of the injection port 36) will be described. When rubber is injected from an injection chamber (not shown), the rubber reaches the periphery of the wing portion 35 through the rubber supply path 32. At this time, the piston portion 34 is biased toward the injection port 36, so the injection port 36 is closed, and the rubber stays around the wing portion 35 in front of the injection port 36. When the pressure of the rubber around the wing portion 35 increases with the injection of rubber, a force is generated that presses the wing portion 35 toward the housing portion 38 because the third piston portion 34c is formed thinner than the second piston portion 34b, and the piston portion 34 is pressed toward the housing portion 38. When this force becomes larger than the biasing force of the biasing member 40, the piston portion 34 moves toward the housing portion 38, and the wing portion 35 abuts against the wall surface of the housing portion 38 to block the through hole 39, the injection port 36 is opened (see FIG. 3), and the rubber is injected. At this time, the gap between the piston portion 34 and the through hole 39 is blocked by the wing portion 35, reducing the possibility of the rubber entering the inside of the storage portion 38. On the other hand, when the rubber is injected, the pressure of the rubber around the wing portion 35 decreases, the force pressing the wing portion 35 toward the storage portion 38 decreases, and the biasing force of the biasing member 40 becomes greater than this force, so that the biasing member 40 presses the piston portion 34 toward the injection port 36, and the other end side of the piston portion 34 fits into the injection port 36, closing the injection port 36 (see FIG. 2), thereby reducing the possibility of the rubber leaking from the injection port 36.

[0025] According to the rubber injection machine 20 of the embodiment described above, when rubber is not being injected, the piston portion 34 is biased by the biasing member 40 toward the injection port 36, so that the piston portion 34 comes into contact with the injection port 36 to close the injection port 36, thereby reducing the possibility of rubber leaking out. On the other hand, when rubber is injected, the third piston portion 34c is formed thinner than the second piston portion 34b, so that the force of the rubber pressure pressing the wing portion 35 toward the housing portion 38 presses the wing portion 35 toward the housing portion 38, and when this force becomes greater than the biasing force of the biasing member 40, the piston portion 34 moves toward the housing portion 38, so that the wing portion 35 comes into contact with the wall surface of the housing portion 38 to block the through hole 39, opening the injection port 36, and blocking the through hole 39 by the wing portion 35 reduces the possibility of rubber entering the inside of the housing portion 38 through the gap between the piston portion 34 and the through hole 39. This can reduce the possibility that rubber will get into the periphery of the biasing member 40 and prevent the biasing member 40 from biasing the piston portion 34.

[0026] Furthermore, since an O-ring 34d is provided in the through hole 39, it is possible to prevent rubber from entering the accommodating portion 38 through the gap between the piston portion 34 and the through hole 39, and to prevent the biasing member 40 provided inside the accommodating portion 38 from interfering with the oscillation of the piston portion 34.

[0027] Furthermore, because the diameter of the wing portion 35 is formed larger than the diameter of the through hole 39, when the wing portion 35 closes the through hole 39, the vicinity of the surface of the through hole 39 comes into contact with the surface of the wing portion 35, which further reduces the possibility that rubber will enter the inside of the housing portion 38 through the gap between the piston portion 34 and the through hole 39. This further reduces the possibility that rubber will enter around the biasing member 40 and prevent the biasing member 40 from biasing the piston portion 34.

[0028] It goes without saying that the present invention is not limited to the above-described embodiment, and can be embodied in various forms within the technical scope of the present invention.

[0029] For example, in the above-described embodiment, the other end side of the piston portion 34 abuts against the flow path of the injection port 36, but the shape is not limited to this as long as the piston portion 34 has a shape that can close the injection port 36. For example, the piston portion 34 may be shaped to be larger than the injection port 36, or the injection port 36 and the other end side of the piston portion 34 may be shaped to fit together. In any case, the same effects as those of the above-described embodiment can be obtained.

[0030] In the above embodiment, the wing portion 35 has a truncated cone shape, but is not limited to a truncated cone shape, and may have, for example, a disk shape or a polygonal prism shape. In either case, the possibility that the rubber will enter the storage portion 38 and interfere with the biasing of the biasing member 40 can be reduced in advance.

[0031] In the above-described embodiment, the boundary between the second piston portion 34b and the third piston portion 34c has a step, but the shape is not limited to this and may be, for example, an inclined surface as long as the thickness of the third piston portion 34c is thinner than that of the second piston portion 34b. In this case, the same effects as those of the above-described embodiment can be obtained.

[0032] In the embodiment described above, the biasing member 40 is disposed along the side surface of the piston portion 34, but the position is not limited to this as long as it is a position where the piston portion 34 can be biased toward the injection port 36, and for example, the biasing member 40 may be fixed to the other end side of the piston portion 34. In this case as well, the same effect as in the embodiment described above can be obtained. [Industrial Applicability]

[0033] As shown in the above-described embodiment, the present invention can be used as a rubber injector, particularly as a nozzle for a rubber injector. [Explanation of symbols]

[0034] 20...rubber injector, 22...rubber extruder, 30...nozzle, 32...rubber supply path, 34...piston portion, 34a...first piston portion, 34b...second piston portion, 34c...third piston portion, 34d...O-ring, 35...lid portion, 36...injection port, 38...accommodating portion, 39...through hole, 40...urging member.

Claims

1. An injection port from which rubber is injected; A rubber supply path through which the rubber is supplied; a piston portion including a first piston portion, a second piston portion connected to the other end side of the first piston portion, and a third piston portion connected to the other end side of the second piston portion and thinner than the second piston portion, the piston portion swinging in a direction toward or away from the injection port, the other end side of the third piston portion opening and closing the injection port; A wing portion provided on a side surface of the piston portion; a biasing member that biases the piston portion toward the injection port; a housing portion having a through hole through which a portion of the piston portion passes and housing the biasing member and at least a portion of the piston portion; Equipped with The wing portion closes the through hole when the injection port is in an open state. nozzle.

2. The through hole is provided with an O-ring. The nozzle of claim 1 .

3. The wing portion is configured to abut against a vicinity of the through hole when the injection port is in an open state.

3. The nozzle according to claim 1 or 2.

4. A nozzle according to any one of claims 1 to 3; a rubber extruder for supplying rubber to the nozzle; The present invention is characterized in that it comprises Rubber injection machine.

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