JP5773529B2 - Injection unit injection unit - Google Patents

Description

  The present invention is a plastic injection molding machine for obtaining a molded product by injecting and filling a molding material such as resin or metal into a mold in a flowable state, and then solidifying the molding material in the mold. The present invention relates to an injection unit in which a flowable molding material is supplied from the outside in relation to an injection device of various injection molding machines such as a rubber injection molding machine, a liquid resin injection molding machine, a metal injection molding machine or a die casting machine.

  As an injection unit that is supplied with a flowable molding material from the outside, for example, there is an injection unit of a screw preplar type injection device represented by Patent Document 1 (FIGS. 4 and 5). The screw prep plastic type injection device 1 opens and closes the plasticizing unit 2 and the injection unit 3 and the material supply paths 60 s and 40 s (referred to as communication paths in Patent Document 1) that connect them, and the material supply paths 60 s and 40 s. In the plasticizing unit 2, the plasticizing screw that is supplied from the hopper 23 into the plasticizing cylinder 20 is plasticized by the plasticizing screw 21 that rotates in the plasticizing cylinder 20. An injection chamber formed in the injection cylinder 30 in the injection unit 3 is supplied to the tip end side of the injection unit 21 and the molten resin is supplied into the injection cylinder 30 of the injection unit 3 through the material supply paths 60 s and 40 s. 32. After the molten resin supplied into 32 is weighed, the material supply path (for example, the material supply path 60s) is closed by the backflow prevention means 61. After that, an injection path 50i (referred to as an injection hole in Patent Document 1) of an injection nozzle 50 by an injection shaft 31 (in the Patent Document 1, an injection plunger is a representative example) that slides in the forward / backward direction in the injection cylinder 30. Inject through. Although explanation is omitted, the plasticizing screw 21 and the injection shaft 31 are made to advance and retract the various driving devices controlled by a control device (not shown), for example, the rotary driving device 22 and the injection shaft 31 that rotate the plasticizing screw 21. It is driven by the injection driving device 33. Further, the backflow prevention means 61 is not limited to the check valve shown in FIG. 1, and other check mechanisms such as other rotary valves may be used, and the plasticizing screw 21 is slightly advanced or retracted. Thus, the opening on the plasticizing cylinder 20 side of the material supply path 60s may be closed.

  The conventional injection unit 3 will be described in more detail. In the conventional injection unit 3, a nozzle cylinder 40 (referred to as a nozzle adapter in Patent Document 1) is attached to the front end of the injection cylinder 30, and an injection nozzle 50 having an injection path 50 i inside is provided at the front end of the nozzle cylinder 40. It is attached. Further, a connecting member 60 having a material supply path 60s inside is attached to the outer peripheral surface of the nozzle cylinder 40. The nozzle cylinder 40 is attached to the front end of the injection cylinder 30 so that a plurality of bolts 70 are inserted in a peripheral portion parallel to the axis and away from the axis. Reference numeral 40 g is a hole through which the bolt 70 is inserted into the nozzle cylinder 40. The key member 71 between the injection cylinder 30 and the nozzle cylinder 40 is provided to match the mounting position of the nozzle cylinder 40 with respect to the injection cylinder 30, and the presence or absence and the number thereof may be determined as necessary.

  The injection cylinder 30 is formed with a cylinder hole 30a for sliding the injection shaft 31 in the axial direction. An injection chamber 32 surrounded by the rear end portion of the nozzle cylinder 40 and the tip end surface 31a of the injection shaft 31 is formed in the cylinder hole 30a. In the nozzle cylinder 40, a front wall 32a (40w) of the injection chamber 32 is formed at the rear end portion thereof, an opening 40hi of the injection path and an opening 40hs of the material supply path are formed, and a part of the injection path is formed therein. A flow path 40 s that is a part of the flow path 40 i and the material supply path is formed. The nozzle cylinder 40 has an injection nozzle 50 attached to the front end thereof, and a connecting member 60 attached to the outer peripheral surface thereof. Thus, the injection paths 40 i and 50 i communicate with the opening 40 hi of the injection chamber 32 from the opening at the tip of the injection nozzle 50. In addition, the material supply paths 40 s and 60 s are connected to the plasticizing cylinder 20 by the connecting member 60 and communicate with the opening 40 hs of the injection chamber 32 from the opening of the plasticizing chamber of the plasticizing cylinder 20. In addition, the communication passage bush 62 communicates the material supply passages 40s and 60s through the communication passage so that the molten resin flowing through the material supply passages 40s and 60s does not leak from the joint surface between the nozzle cylinder 40 and the connecting member 60. Is provided.

Japanese Patent No. 3638734

  However, in the maintenance work after the actual operation of the conventional injection apparatus 1, the nozzle cylinder attached with a plurality of bolts 70 is used to clean the inside of the injection chamber 32 with the disassembly of the injection unit 3 and to replace the injection shaft 31. Since it was necessary to remove 40 and open the front end side of the cylinder hole 30a of the injection cylinder 30, it may take time and effort.

Further, in the mounting of a conventional nozzle cylinder 40, when fixing by tightening the rear end of the nozzle cylinder 40 to the front end portion of the injection cylinder 30 by a plurality of bolts 70, the tightening force is equalized due to the bolts 70 I had to pay attention to be carried out Ocean.

  Further, the conventional nozzle cylinder 40 is directly formed therein with portions that come into contact with the molding material such as the front wall 32a (40w) of the injection chamber 32, a part 40i of the injection path, and a part 40s of the material supply path. It was. Therefore, when a special molding material is used, if corrosion or wear occurs in a portion in contact with the molding material, it is necessary to replace the nozzle cylinder 40 itself with a new one. In addition, in order to prevent corrosion and wear, when the flow path of the molding material is formed with an expensive material, the entire nozzle cylinder 40 is manufactured with the expensive material, which is problematic in terms of price. . Further, when coating for preventing corrosion and wear is performed, for example, the distance of the flow path of the molding material is long and the shape becomes complicated, so that the coating operation may be difficult.

  Therefore, in the present invention, with respect to the injection unit of the injection device, particularly, regarding the injection unit that supplies a molding material that can flow from the outside, in the portion where the molding material flows, the operation of disassembling and cleaning the portion or the portion The purpose is to facilitate maintenance work such as part replacement work, facilitate assembly work after disassembly and part replacement, and reduce the manufacturing cost of replacement parts of the part.

  In the injection unit of the injection device of the present invention, the injection shaft is slidable in the forward / backward direction in the cylinder hole of the injection cylinder, and an injection chamber is provided between the tip surface of the injection shaft and the front wall of the cylinder hole. After forming and storing the flowable molding material supplied from the outside of the injection chamber through the material supply path in the injection chamber, the molding material in the injection chamber is passed through the injection path by the injection shaft. (1) a nozzle cylinder attached to the front end of the injection cylinder and having a cylinder hole having an inner diameter larger than the inner diameter of the cylinder hole of the injection cylinder; and (2) the nozzle A thread groove formed in at least a part of the inner peripheral surface of the cylinder hole of the cylinder, and (3) a rear end portion inserted into the cylinder hole of the nozzle cylinder, the front end of the injection cylinder The front wall of the cylinder hole of the injection cylinder by abutting on, and having a flow path that forms part of the injection path that opens to the front wall and opens the other to the front end, A top member having a flow path that is a part of the material supply path that opens to the front wall and the other to the outer peripheral surface; and (4) a flange or a flange in the cylinder hole of the nozzle cylinder. The formed rear portion is inserted and brought into contact with the front end portion of the piece member, so that one of the openings is opened at the front wall and the other is opened at the tip end of the injection path of the piece member. An injection nozzle having the injection path that communicates with a part of the flow path; and (5) an inner diameter smaller than the outer diameter of the flange portion or the flange portion of the injection nozzle while the injection nozzle is inserted into the axis. The nozzle cylinder having an inner hole By forming a thread groove to be screwed into the thread groove of the cylinder hole of the cylinder hole and screwing it into the cylinder hole of the nozzle cylinder, the rear end portion presses the flange portion or the flange portion, An attachment member for pressing the injection nozzle against the piece member and pressing the piece member against the injection cylinder; and (6) a position facing the opening formed on the outer peripheral surface of the piece member, the nozzle cylinder A through-hole penetrating from the outer peripheral surface to the inner peripheral surface of the material, and (7) the material supply passage is inserted into the through-hole and is a part of the material supply passage of the top member. And a supply path bush having a communication hole formed therein.

In the injection unit of the injection device of the present invention, the injection shaft is slidable in the forward / backward direction in the cylinder hole of the injection cylinder, and the injection is made between the tip surface of the injection shaft and the front wall of the cylinder hole. After forming a chamber and storing the flowable molding material supplied from the outside of the injection chamber through the material supply passage in the injection chamber while measuring it, the molding material in the injection chamber is injected by the injection shaft. In an injection unit of an injection device for injecting through a path, (1) a nozzle cylinder attached to a front end portion of the injection cylinder and having a cylinder hole having an inner diameter larger than an inner diameter of a cylinder hole of the injection cylinder; A thread groove formed in at least a part of an inner peripheral surface of a cylinder hole of the nozzle cylinder; and (3) a rear end portion inserted into the cylinder hole of the nozzle cylinder. The front wall of the cylinder hole of the injection cylinder is formed by coming into contact with the front end, and has a flow path that becomes a part of the injection path that opens to the front wall and opens the other to the front end. A top member having a flow path that is a part of the material supply path, one of which is opened on the front wall and the other is opened on the outer peripheral surface; and (4) the thread groove formed in the cylinder hole of the nozzle cylinder. A thread groove to be screwed is formed on the outer peripheral surface of the rear part, and the rear part is screwed into a cylinder hole of the nozzle cylinder, thereby pressing the top member and pressing the top member against the injection cylinder. The injection path that communicates with the flow path that forms a part of the injection path of the top member as one of the injection paths that opens to the front wall and opens the other end to the front end. Having injection nose And (5) a through hole formed in the outer peripheral surface of the top member and facing the opening and penetrating from the outer peripheral surface to the inner peripheral surface of the nozzle cylinder, and (6) inserted into the through hole. And a supply passage bush that forms a part of the material supply passage in the top member and a communication hole for communicating the material supply passage.

In the injection unit of the injection apparatus of the present invention, the injection cylinder and the nozzle cylinder may be formed integrally.

In the injection unit of the injection apparatus of the present invention, the injection nozzle and the piece member may be integrally formed.

  Further, in the injection unit of the injection device of the present invention, when the piece member is mounted in the cylinder hole of the nozzle cylinder, the material supply opening to the communication hole of the supply path bush and the outer peripheral surface of the piece member. In order to communicate with the flow path that is a part of the path, in order to make the rotation impossible at the relative rotation angle at which the opening of the communication hole of the supply path bush and the opening of the outer peripheral surface of the top member face each other A rotation-inhibiting key member may be provided between the inner peripheral surface of the cylinder hole of the nozzle cylinder and the outer peripheral surface of the piece member, or between the front end portion of the injection cylinder and the rear end portion of the piece member.

  The screw prep plastic injection device of the present invention is a screw prep plastic injection device comprising the injection unit of the injection device of the present invention described above, and a plasticizing unit for plasticizing a resin material in a plasticizing cylinder; The injection unit that injects the molten resin supplied from the plasticizing unit while being measured in the injection chamber of the injection cylinder and then injected by the injection shaft, the plasticizing chamber in the plasticizing cylinder, and the injection cylinder The material supply path that communicates with the injection chamber inside is formed inside, and an insertion hole for inserting one end of the supply path bush into the surface to which the injection cylinder is attached and communicating the material supply path is provided. And a connecting member.

(A) In the injection unit of the injection apparatus according to the present invention, a cylinder hole is provided in the nozzle cylinder, and a front wall of the injection chamber, a part of the injection path, and a part of the material supply path are first formed in the cylinder hole. Insert the member, then insert the rear end of the injection nozzle that formed the injection path, and then screw one screw and nut mechanism, that is, the mounting member into the cylinder hole of the nozzle cylinder, and the top member and injection The nozzle is fixed. The inner diameter of the cylinder hole of the nozzle cylinder is formed larger than the cylinder hole of the injection cylinder. Therefore, in the injection unit of the present invention, it is possible to easily remove the injection nozzle and the piece member by simply removing one screw / nut mechanism, that is, one mounting member. The injection shaft can be inserted and removed from the front end side of the nozzle cylinder without being removed from the nozzle cylinder. In addition, the injection unit of the present invention finally seals the periphery of the front wall of the injection chamber by tightening the rear end of the top member and the front end of the injection cylinder by one screw / nut mechanism. The work of making the surface pressure of the sealing surface uniform over the entire circumference becomes easy. Therefore, the injection unit of the present invention generally makes maintenance very easy, shortens the maintenance work time, and improves the accuracy of the attachment work. (B) In the injection unit of the injection device of the present invention, the nozzle cylinder is provided with a through hole from the outer peripheral surface to the inner peripheral surface, and the supply path bush is detachably attached in the through hole, so It is possible to communicate between the injection chamber and the outside of the injection unit by communicating the material supply path and the communication hole in the supply path bush. (C) In the injection unit of the injection apparatus according to the present invention, the front wall of the injection chamber is formed at the rear end of the top member detachably mounted in the nozzle cylinder. Even if it corrodes, it is only necessary to replace the top member. (D) In the injection unit of the injection apparatus according to the present invention, the molding material flows in the flow passage formed in the top member and the supply passage bush that are detachably attached in the nozzle cylinder, so that the flow passages are worn. Even if it is corroded or corroded, the top member and the supply path bush may be replaced. (E) In the injection unit of the injection apparatus of the present invention, it is only necessary to replace the coma member and supply path bush, which are parts that are much smaller than the nozzle cylinder, thereby reducing the manufacturing cost of replacement parts and the purchase cost of replacement parts. it can. In particular, when these parts are manufactured using expensive materials that are resistant to wear and corrosion, the cost can be greatly reduced as compared to manufacturing the entire nozzle cylinder. In addition, the flow path of the molding material formed in the top member and the supply path bush is short in distance and can be formed into a simple shape. The coating for preventing it can be easily applied. Also, when coating the front wall of the injection chamber formed by the rear end portion of the top member, the top member itself is a small part compared to the nozzle cylinder, so that the coating operation is easy. (F) In the injection unit of the injection device of the present invention, the front wall of the injection chamber is formed at the rear end of the top member, and at least the opening of the injection path and the material supply path is formed on the front wall. Prepare multiple types of piece members with different opening positions, number of openings and inner diameter of the openings, and shape of molded product, type of molding material, and injection chamber from among the multiple types of piece members It is possible to easily select and replace them appropriately according to the staying state.

Further, in the injection unit of the injection apparatus of the present invention, a screw groove that is screwed into a screw groove of the cylinder hole of the nozzle cylinder is formed on the outer peripheral surface of the rear portion of the injection nozzle, and the injection nozzle is screwed into the cylinder hole of the nozzle cylinder. Therefore, if the piece member is pressed at the rear end portion of the injection nozzle and is pressed against the front end portion of the injection cylinder at the rear end portion of the piece nozzle, the mounting member becomes unnecessary.

Further, in the injection unit of the injection device of the present invention, the injection cylinder and the nozzle cylinder may be integrally formed, and even in such a case, the injection nozzle and the piece member can be easily removed from the injection unit, The injection shaft can be easily inserted and removed from the front end side of the nozzle cylinder.

Further, in the injection unit of the injection apparatus of the present invention, the injection nozzle and the piece member may be formed integrally, and even in such a case, the member in which the injection nozzle and the piece member are formed integrally from the injection unit can be easily formed. While being removable, the injection shaft can be easily inserted and removed from the front end side of the nozzle cylinder.

  Further, in the injection unit of the injection device of the present invention, when the piece member is mounted in the cylinder hole of the nozzle cylinder, the opening of the flow path that becomes a part of the material supply passage formed on the outer peripheral surface of the piece member, and the supply The opening on the injection cylinder side of the communication hole formed in the road bush is made non-rotatable by the rotation prevention key member at the relative rotation angle when finally facing, so that these openings are brought into contact with each other, The coma member can be easily inserted into the cylinder hole of the nozzle cylinder so that the communication hole and the flow path communicate with each other, and the coma member rotates together with the rotation of the mounting member or the injection nozzle to open the openings. Can be prevented from shifting.

  Moreover, the injection unit of the injection device of the present invention can be mounted on the injection unit of the injection device of the screw preplar type injection device.

It is the figure which expanded the front part of the injection unit while showing the Example of the injection unit of this invention, Comprising: A figure (a) is a longitudinal cross-sectional view, A figure (b) is BB sectional drawing of a figure (a), And FIG. (C) is CC arrow line view of FIG. (A). FIG. 5 is a view showing another embodiment of the injection unit of the present invention and is an enlarged view of the front portion of the injection unit, in which FIG. (A) is a longitudinal sectional view, and FIG. (B) is a BB cross section of FIG. The figure and figure (c) are CC arrow line views of figure (a). FIG. 5 is a view showing another embodiment of the injection unit of the present invention and is an enlarged view of the front portion of the injection unit, in which FIG. (A) is a longitudinal sectional view, and FIG. (B) is a BB cross section of FIG. The figure and figure (c) are CC arrow line views of figure (a). It is a longitudinal cross-sectional view which shows the outline of the conventional screw prep plastic type injection apparatus. It is the figure which expanded the front part of the conventional injection unit, Comprising: A figure (a) is a longitudinal cross-sectional view, A figure (b) is BB sectional drawing of a figure (a), and a figure (c) is a figure (a). It is a CC arrow line view of).

  Hereinafter, the injection unit of the injection apparatus of the present invention will be described with reference to Examples 1 to 3 (FIGS. 1 to 3). The description of the conventionally known portion has already been described by taking the injection unit (FIGS. 4 and 5) of the screw preplar type injection device as an example, and will be omitted. The injection shaft 31 is not limited to a plunger, and includes an equivalent to the injection shaft 31 such as a screw having a check ring.

Example 1
FIG. 1 shows an example of an injection unit 3 according to the present invention, and is an enlarged view of a front portion of the injection unit 3. FIG. 1 (a) shows a longitudinal sectional view, and FIG. BB sectional drawing of this is shown, and the figure (c) shows the CC arrow line view of figure (a). A nozzle cylinder 40 is attached to the front end portion of the injection cylinder 30 with a plurality of bolts 70, and a cylinder hole 30a in which the injection shaft 31 slides is formed at the axis. The injection cylinder 30 and the nozzle cylinder 40 are coaxial.

  The nozzle cylinder 40 is formed with a cylinder hole 40 a having an inner diameter larger than the cylinder hole 30 a of the injection cylinder 30. The cylinder hole 40a of the nozzle cylinder 40 is attached so that a thread groove 40n is formed in at least a part of its inner peripheral surface, for example, a front portion of the inner peripheral surface, and a rotation prohibiting key 45 protrudes from the rear portion. It has been. Therefore, first, the top member 41 is inserted into the cylinder hole 40a of the nozzle cylinder 40 while being guided by the rotation prohibition key 45 so that the top member 41 does not rotate with respect to the axis thereof, and then the flange (or the injection nozzle 50) (or The rear portion including the flange portion 51 is inserted, and then the attachment member 42 is screwed so as to be screwed into the screw groove 40n, and is pressed so as to press the flange portion 51 of the injection nozzle 50. And the rear end portion of the top member 41 is attached to the front end portion of the injection cylinder 30. Further, the nozzle cylinder 40 is formed with a through hole 40b penetrating from the outer peripheral surface to the cylinder hole 40a. Thus, the communication passage bush 43 is inserted into the through hole 40 b so as to come into contact with a predetermined position on the outer peripheral surface of the top member 41 in the nozzle cylinder 40.

  Each member is described in more detail. In the top member 41, a surface 41 w that forms the front wall 32 a of the injection chamber 32 is formed at the rear end portion thereof, and a cylinder hole 30 a that opens to the front end portion of the injection cylinder 30 is formed on the outer periphery of the surface 41 w that forms the front wall 32 a. A seal surface 41f that comes into contact with the outer periphery is formed. The surface 41w that forms the front wall 32a of the injection chamber 32 is formed with at least one injection path opening 41hi and at least one material supply path opening 41hs. For example, in FIG. 1, the opening 41hi of the injection path is formed at the center of the surface 41w forming the front wall 32a of the injection chamber 32, and the opening 41hs of the material supply path is formed at the upper part of the surface 41w and at the peripheral edge of the surface 41w. Forming. The positions of the openings 41 hi and 41 hs are not limited to these, and may be formed at appropriate positions depending on the staying state of the molding material in the injection chamber 32. The top member 41 has at least one flow path 41i that is part of an injection path that opens to a front surface 32w that forms the front wall 32a of the injection chamber 32 at one end of the top member 41. , At least one flow path 41 s that is part of a material supply path that opens to the outer peripheral surface and the other opens to the surface 41 w that forms the front wall of the injection chamber 32 at the rear end. It is formed. Further, on the outer peripheral surface of the top member 41, when the top member 41 is finally attached to the cylinder hole 40a of the nozzle cylinder 40, the top side of the communication hole 43s of the supply passage bush 43, which will be described later, on the top member 41 side. The flow path 41s that is a part of the material supply path described above is opened at a position where the opening comes into contact. In order to enable the top member 41 to be attached to and detached from the cylinder hole 40a of the nozzle cylinder 40 even when the communication passage bush 43 protrudes into the cylinder hole 40a of the nozzle cylinder 40, A plane 41p parallel to the axial center of the piece 41 may be chamfered on the outer peripheral surface of the top member 41, and the flow path 41s serving as a part of the material supply path described above may be opened at a predetermined position on the plane 41p ( FIG. 1). Further, the top member 41 is provided on the side of the top member 41 (in FIG. 2, the injection nozzle 500 integrally formed with the top member) of the supply path bush 43, as in another embodiment (FIGS. 2 and 3) described later. A groove 41t (reference numeral 500t in FIG. 2) having a width that fits the tip of the material member is formed on the outer peripheral surface of the top member 41 in parallel to the axis thereof, and the above-described material supply path of the groove 41t is formed at a predetermined position. A part of the flow path 41s (500s in FIG. 2) may be opened. The flat surface 41p and the communication path bush 43 or the groove 41t (500t) and the communication path bush 43 may be used as a key groove and a rotation inhibition key. Further, the top member 41 may be formed with a rotation prohibiting key groove 41k formed on the outer peripheral surface thereof in parallel with the axis thereof and with which the rotation prohibiting key 45 is engaged.

  The injection nozzle 50 is formed with at least one flow path 50i that is part of the injection path, one of which opens at the tip and the other of which opens at the rear end. Further, the injection nozzle 50 has a flange 51 (or flange) formed at the rear part thereof. In addition, the injection nozzle 50 is formed with an outer diameter dimension so that a portion in front of the flange portion 51 can be inserted into the inner hole 42 a of the mounting member 42.

  The mounting member 42 is formed with a thread groove 42n on the outer peripheral surface thereof to be screwed into a thread groove 40n formed in the cylinder hole 40a of the nozzle cylinder 40. Further, the mounting member 42 has an inner diameter that is smaller than the outer diameter of the flange portion 51 (or flange portion) of the injection nozzle and larger than the outer diameter of the portion in front of the flange portion 51 of the injection nozzle 50. It has an inner hole 42a. The mounting member 42 has means for screwing the mounting member 42 into the nozzle cylinder 40 using a tool. For example, the outer periphery of the front end portion may be formed by a proper means such as forming a regular hexagon (reference numeral 42r in FIG. 1).

  The supply path bush 43 is formed with a communication hole 43 s that becomes a part of the material supply path. For example, in the case where the plasticizing unit 2 is provided outside the injection unit 3 via the connecting member 60, the supply path bush 43 includes a part of the material supply path respectively included in the connecting member 60 and the top member 41. It attaches so that the flow paths 60s and 41s which become may communicate. For example, the supply path bush 43 abuts so that one of its both ends is pressed against a predetermined position of the piece member 41 and the other abuts so as to be pressed against a predetermined position of the connecting member 60 so as to be sealed. It may be attached to.

  In the injection unit 3 including such a member, the members are mounted in the nozzle cylinder 40, whereby the flow paths 41i and 50i that are part of the injection path communicate with each other to form an injection path, and the material supply path A part of the flow paths 41s and 43s communicate with each other to form a material supply path. Further, in the injection unit 3, an injection chamber 32 is formed between the rear end portion of the piece member 41 and the tip end surface 31 a of the injection shaft 31, and an injection path opening 41 hi and material supply are provided in the front wall 32 a of the injection chamber 32. A road opening 41hs is opened. Therefore, in the injection unit 3, various flow paths can be exchanged by a simple operation of attaching / detaching one bolt / nut mechanism without performing the troublesome operation of attaching / detaching the nozzle cylinder 40 from the injection cylinder 30. The injection shaft 31 can be inserted and removed from the nozzle cylinder 40 side, and the surface pressure of the seal surface 41f around the front wall 32a of the injection chamber 32 can be easily made uniform. In order to make the surface pressure of the seal surface 41 more uniform, it is more preferable that the outer diameter of the rear end portion of the top member 41 is reduced and the seal surface 41f is formed in a clean annular shape. Further, in the injection unit 3, as shown in FIG. 1, the portion where the front end portion of the nozzle cylinder 40 and the rear end portion of the top member 41 abut each other may have an inlay structure Y1. Of course, since the spigot structure in this case also has the purpose of enhancing the sealing effect, it is preferable that the height dimension of the protrusion on the convex side is larger than the depth dimension of the hole on the concave side.

(Example 2)
FIG. 2 shows another example of the injection unit according to the present invention, and is an enlarged view of the front part of the injection unit 3. FIG. 2 (a) shows a longitudinal sectional view, and FIG. ) Is a cross-sectional view taken along the line B-B of FIG.

  In the injection unit 3 of the present invention, like the injection nozzle 500 of the present embodiment, the piece member 41 and the injection nozzle 50 of the first embodiment described above may be integrally formed. Further, in the injection unit 3 of the present invention, as in the present embodiment, in addition to the flow path 500s and the injection path 500i that are part of the material supply path, one of them opens to the front wall 32a of the injection chamber 32. At least one injection sub-passage 500d, one of which opens in the middle of the injection passage 500i, may be formed. For example, in FIG. 2, an opening 500hi of the injection path is formed at the center of the surface 500w forming the front wall 32a of the injection chamber 32, and an opening 500hs of the material supply path is formed at the upper part of the surface 500w and at the peripheral portion. The opening 500hd of the injection sub-path is formed below the surface 500w and at the peripheral edge of the surface 500w. The positions of the openings 500hi, 500hs, and 500hd are not limited to the embodiment, and may be formed by changing to appropriate positions.

  Moreover, in the injection unit 3 of the present invention, the injection cylinder 30 and the nozzle cylinder 40 have the inlay structure Y2 at the abutting portions as in the present embodiment, so that they can be easily mounted on the same axis. Become. Further, as in this embodiment, as a means for prohibiting the rotation of the injection nozzle 500 relative to the nozzle cylinder 40, a key groove 500k parallel to the axis of the injection nozzle 500 is formed on the outer peripheral surface of the injection nozzle 500, and the key groove A rotation inhibition key 35 (corresponding to reference numeral 45 in the first embodiment) that engages with 500 k may be provided between the injection cylinder 30 and the rotation inhibition key 35.

(Example 3)
FIG. 3 shows another example of the injection unit 3 of the present invention, and is an enlarged view of the front part of the injection unit 3. FIG. 3 (a) shows a longitudinal sectional view, and FIG. The BB sectional view of a) is shown, and the figure (c) shows the CC arrow line view of figure (a).

In the injection unit 3 of the present invention, like the injection cylinder 300 of the present embodiment, the injection cylinder 30 and the nozzle cylinder 40 of the first and second embodiments described above may be integrally formed. Further, in the injection unit 3 of the present invention, like the injection nozzle 550 of the present embodiment, the injection nozzle 50 and the mounting member 42 of the first embodiment may be integrally formed. Further, when the injection nozzle 50 and the attachment member 42 are integrally formed, the flange portion 51 (or flange) of the injection nozzle 50 can be omitted.

  Further, in the injection unit 3 of the present invention, as in this embodiment, as a means for prohibiting the rotation of the top member 41, the supply path bush 43 is engaged with a groove 41t formed on the outer peripheral surface of the top member 41. Further, the configuration of the separate rotation prohibiting means may be omitted by detachably attaching the top member 41 in a state in which the rotation of the top member 41 is prohibited. Further, the supply path bush 43 includes a flange portion 43b (or flange portion), and when the supply path bush 43 is in contact with the top member 41, the outer peripheral surface of the injection cylinder 300 and the flange portion 43b (or flange portion). Since the end of the supply path bush 43 is sufficiently pressed against the piece member 41 and the piece member 41 is pulled out, the flange portion 43b (or flange portion) is caught on the outer peripheral surface of the injection cylinder. Thus, the supply path bush 43 may be prevented from falling any further. Further, in the injection unit 3 of the present invention, for example, as shown in FIG. 3, the opening 41 hi of the flow path 41 i that becomes a part of the injection path 41 is formed at the center of the surface 41 w that forms the front wall 32 a of the injection chamber 32, An opening 41hd of the injection sub-passage 41d is formed at the lower portion of the surface 41w and at the peripheral portion of the surface 41w, and at the center in the vertical direction of the surface 41w and at the peripheral portion of the surface 41w and in a symmetrical position Two of the openings 41hs of the flow path 41s that are part of the material supply path may be formed. At that time, a part of the material supply path 41s formed inside the piece member 41 has a flow path 41s that opens in the outer peripheral surface of the piece member 41s by joining the two passages inside the piece member 41. What is necessary is just to form. Note that the positions of the openings 41hi, 41hs, and 41hd are not limited to the embodiment, and may be formed by changing to appropriate positions.

  The present invention is not limited to Examples 1 to 3 and FIGS. 1 to 3 described so far, and can be modified as appropriate without departing from the spirit of the present invention. In addition, the present invention is not limited to the first to third embodiments and the first to third embodiments described above, and the injection path formed in the top member 41 (reference numeral 500 in the second embodiment), The inner diameter, the number, the shape, the inner diameter of the opening, the position of the opening, and the like of the flow paths of various molding materials such as the material supply path or the injection sub-path can be appropriately changed.

DESCRIPTION OF SYMBOLS 1 Injection apparatus 2 Plasticizing unit 3 Injection unit 20 Plasticizing cylinder 30 Injection cylinder 30a Injection cylinder cylinder hole 31 Injection shaft 32 Injection chamber 32a Injection chamber front wall 40 Nozzle cylinder 40a Nozzle cylinder cylinder hole 40b Nozzle cylinder through hole 40 n Screw groove 41 formed on the inner peripheral surface of the cylinder hole of the nozzle cylinder 41 Top member 41 i Injection path 41 hi formed on the top member Injection path opening 41 s formed on the front wall of the injection chamber Material formed on the top member Supply path 41hs Material supply path opening 41w formed on the front wall of the injection chamber Surface 42 forming the front wall of the injection chamber 42 Mounting member 42a Inner hole 42n of the mounting member Screw groove 43 formed on the outer peripheral surface of the mounting member Bush 43s Material supply passage 50 formed in communication passage bush 50 Injection nozzle 50i Formed in injection nozzle Injection passage 60 connecting member

Claims (6)

An injection shaft is slidable in the advancing and retreating direction in the cylinder hole of the injection cylinder, an injection chamber is formed between the tip surface of the injection shaft and the front wall of the cylinder hole, and the material is formed from the outside of the injection chamber. In an injection unit of an injection apparatus, in which a flowable molding material supplied through a supply path is stored while being measured in the injection chamber, and then the molding material in the injection chamber is injected through the injection path by the injection shaft. ,
(1) a nozzle cylinder attached to a front end portion of the injection cylinder and having a cylinder hole having an inner diameter larger than an inner diameter of a cylinder hole of the injection cylinder;
(2) a thread groove formed in at least a part of the inner peripheral surface of the cylinder hole of the nozzle cylinder;
(3) It is inserted into the cylinder hole of the nozzle cylinder, and the rear end abuts against the front end of the injection cylinder to form the front wall of the cylinder hole of the injection cylinder, and one of the front walls is A flow that is part of the material supply path that has an opening and has a flow path that is a part of the injection path that opens the other end at the front end, and one that opens to the front wall and the other that opens to the outer peripheral surface. A top member having a path;
(4) A rear portion having a flange portion or a flange portion is inserted into the cylinder hole of the nozzle cylinder, and comes into contact with the front end portion of the top member, thereby opening one to the front wall. An injection nozzle having the injection path that communicates with a flow path that is a part of the injection path of the top member,
(5) The injection nozzle is inserted into the shaft center and has an inner hole whose inner diameter is smaller than the outer diameter of the flange portion or the flange portion of the injection nozzle, and is screwed into the thread groove of the cylinder hole of the nozzle cylinder. A thread groove to be formed is formed on the outer peripheral surface and screwed into the cylinder hole of the nozzle cylinder so that the rear end portion presses the flange portion or the flange portion and presses the injection nozzle against the top member. And an attachment member that presses the top member against the injection cylinder;
(6) A through-hole penetrating from the outer peripheral surface of the nozzle cylinder to the inner peripheral surface at a position facing the opening formed on the outer peripheral surface of the top member;
(7) A supply path bush that is inserted into the through-hole and has a communication hole for communicating the material supply path with a flow path that is a part of the material supply path in the top member;
An injection unit for an injection apparatus, comprising: An injection shaft is slidable in the advancing and retreating direction in the cylinder hole of the injection cylinder, an injection chamber is formed between the tip surface of the injection shaft and the front wall of the cylinder hole, and the material is formed from the outside of the injection chamber. In an injection unit of an injection apparatus, in which a flowable molding material supplied via a supply path is measured and stored in the injection chamber, and then the molding material in the injection chamber is injected via the injection path by the injection shaft. ,
(1) a nozzle cylinder attached to a front end portion of the injection cylinder and having a cylinder hole having an inner diameter larger than an inner diameter of a cylinder hole of the injection cylinder;
(2) a thread groove formed in at least a part of the inner peripheral surface of the cylinder hole of the nozzle cylinder;
(3) It is inserted into the cylinder hole of the nozzle cylinder, and the rear end abuts against the front end of the injection cylinder to form the front wall of the cylinder hole of the injection cylinder, and one of the front walls is A flow that is part of the material supply path that has an opening and has a flow path that is a part of the injection path that opens the other end at the front end, and one that opens to the front wall and the other that opens to the outer peripheral surface. A top member having a path;
(4) A screw groove that is screwed into the screw groove formed in the cylinder hole of the nozzle cylinder is formed on the outer peripheral surface of the rear portion, and the rear portion is screwed into the cylinder hole of the nozzle cylinder to press the piece member. In addition, by pressing the top member against the injection cylinder and abutting the front end of the top member, the top of the top member serves as the injection path that opens at the front wall and opens the other at the tip. An injection nozzle having the injection path communicating with a flow path that is a part of the injection path;
(5) a through hole penetrating from the outer peripheral surface of the nozzle cylinder to the inner peripheral surface at a position facing the opening formed on the outer peripheral surface of the top member;
(6) A supply path bush that is inserted into the through-hole and has a communication hole for communicating the flow path that is part of the material supply path of the top member and the material supply path;
An injection unit for an injection apparatus, comprising: The injection unit of an injection apparatus according to claim 1 or 2, wherein the injection cylinder and the nozzle cylinder are integrally formed. The injection unit of the injection apparatus according to claim 1 or 3, wherein the injection nozzle and the piece member are integrally formed.   When the piece member is mounted in the cylinder hole of the nozzle cylinder, the communication hole of the supply path bush and the flow path that is a part of the material supply path that opens to the outer peripheral surface of the piece member are communicated. In order to prevent rotation at a relative rotation angle where the opening of the communication hole of the supply passage bush and the opening of the outer peripheral surface of the piece member face each other, the inner peripheral surface of the cylinder hole of the nozzle cylinder 5. The rotation prohibiting key member is provided between an outer peripheral surface of the piece member or between a front end portion of the injection cylinder and a rear end portion of the piece member. Injection unit of the injection device.   A screw pre-pull type injection device comprising the injection unit of the injection device according to any one of claims 1 to 5, comprising a plasticizing unit for plasticizing a resin material in a plasticizing cylinder, and the plasticizing unit. The injection unit that injects the molten resin to be supplied while being measured in the injection chamber of the injection cylinder and then injected by the injection shaft, the plasticizing chamber in the plasticizing cylinder, and the injection chamber in the injection cylinder A connecting member having an insertion hole for inserting one end of the supply path bushing into a surface to which the injection cylinder is attached and communicating the material supply path. A screw pre-plastic injection device characterized by comprising:

Images