JP2018161835A - Two-plate type injection machine and method for pulling out screw - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a two-plate type injection machine and a method for pulling out a screw capable of easily and safely carrying out screw pull and restoration.SOLUTION: A moving plate includes: a slide plate member advanceable/retreatable with respect to a fixed plate; and a plate member for measuring-drive unit attachably/detachably arranged on the back surface side of a surface opposing the fixed plate of the slide plate member. The plate member for measuring-drive unit is arranged with a measuring-drive unit provided with a screw rotation support shaft for attachably/detachably supporting the rear end of a screw, a motor for measuring, and a rotation transmission mechanism for transmitting power of the motor for measuring to the screw via the screw rotation support shaft, and is capable of pulling the screw out of the rear end of the screw by releasing the connection between the screw rotation support shaft and the rear end of the screw and removing the plate member for measuring-drive unit from the slide plate member.SELECTED DRAWING: Figure 2

Description

  The present invention relates to a two-plate injection device used for injection molding and a screw drawing method in the two-plate injection device.

  Conventionally, as an injection apparatus for injecting and filling molten resin into a mold cavity formed in a mold, as shown in FIG. 9, a screw 102 for plasticizing, weighing and injecting a resin material, and a screw 102 , A metering drive mechanism (not shown) for rotating the screw 102 in the heating barrel 104, and an injection drive mechanism for moving the screw 102 along the axial direction in the heating barrel 104 An in-line screw type injection device 100 including 106 is widely used (Patent Document 1).

  In such a conventional in-line screw injection apparatus 100, when the screw 102 is taken out from the heating barrel 104 for cleaning, inspection, replacement, etc., a purge process and a nozzle for discharging the resin material in the heating barrel 104 After the parts are removed, as shown by a solid line in FIG. 9, the entire apparatus is turned and the screw 102 is pulled out from the front side of the heating barrel 104. Note that FIG. 9 illustrates a state after removing components such as a nozzle, and thus the tip of the screw 102 protrudes from the heating barrel 104.

  However, such a conventional method of pulling out the screw 102 from the front requires a mechanism and a space for turning the entire apparatus, which may increase the manufacturing cost, and the space and the screw 102 for turning. There is a problem that it cannot be adopted when a space for pulling out the sheet cannot be secured. Further, since it is necessary to take out the screw 102 before the residual resin in the heating barrel 104 is solidified, the removal work of the components such as the nozzle becomes a hot work in which the screw 102 is in a high temperature state. Workers may get burned. Further, in the conventional inline screw type injection device 100, there is a possibility that the nozzle cannot be removed from the heating barrel 104 due to seizure due to thermal expansion and the screw 102 cannot be pulled out.

  Therefore, in order to solve the above-described problem, as shown in FIG. 10, one end side is rotatably supported by the rear plate 202 and the other end side is screwed to the ball screw nut 206 of the moving plate 204. An in-line screw injection device 200 has been proposed in which the shaft 208 has a hollow structure, and the screw 212 can be pulled out from the rear side through the hollow space (detachment hole 210) of the ball screw shaft 208 ( Patent Document 2).

JP 05-77289 A Japanese Patent Laid-Open No. 06-55593

  However, since the in-line screw type injection device 200 of Patent Document 2 needs to employ a special ball screw shaft 208 having a hollow structure, the manufacturing cost may increase and the manufacturing period may increase. . Further, in the inline screw injection device 200 of Patent Document 2, it is necessary to arrange the ball screw shaft 208 coaxially with the screw 212, and the outer diameter of the flight of the screw 212 is equal to or smaller than the inner diameter of the attachment / detachment hole 210 of the ball screw shaft 208. There is a problem that various restrictions such as need to be set occur.

  The present invention has been made in view of the above circumstances, and an object thereof is to provide a two-plate injection device and a screw extraction method capable of easily and safely executing extraction and restoration of a screw. .

  A two-plate injection device according to the present invention includes a fixed plate, a movable plate provided so as to be able to advance and retreat relative to the fixed plate, and a screw supported by the movable plate so as to be rotatable about an axis. A two-plate injection device in which the screw can advance and retreat by moving the moving plate forward and backward with respect to the fixed plate, the moving plate including a slide plate member capable of moving forward and backward with respect to the fixed plate; A metering drive unit plate member detachably disposed on the back side of the surface of the slide plate member facing the fixed plate, and a rear end portion of the screw is detachably attached to the metering drive unit plate member. A screw rotation support shaft to be supported, a metering motor, and the power of the metering motor through the screw rotation support shaft. A metering drive unit including a rotation transmission mechanism for transmitting to the screw is disposed, the connection between the screw rotation support shaft and the rear end of the screw is released, and the metering drive unit plate member from the slide plate member By removing the screw, the screw can be pulled out from the rear end side of the screw.

  In the two-plate injection device according to the present invention, the moving plate is formed with a through hole penetrating from a surface facing the fixed plate to a back surface thereof, and the screw rotation support shaft is centered on the shaft. Provided in the through hole in a rotatable state, with one end portion being detachably connected to the rear end portion of the screw and the other end portion being connected to the rotation transmission mechanism. preferable.

  In this case, the metering drive unit plate member has a cylindrical support portion extending toward the slide plate member, the through hole is formed in the cylindrical support portion, and the slide plate member is And the measuring drive unit plate has an insertion hole into which the cylindrical support portion can be inserted, and the measuring drive unit plate is inserted into the insertion hole of the slide plate member by inserting the cylindrical support portion of the measuring drive unit plate member. Preferably, the member is configured to be positioned with respect to the slide plate member.

  In the two-plate injection device according to the present invention, the metering drive unit plate member is formed with at least two guide through holes penetrating from the surface facing the slide plate member to the back surface thereof. The slide plate member has guide mounting portions formed at positions aligned with the guide through-holes of the metering drive unit plate member, and the two-plate injection device includes the metering drive unit plate member. It further includes at least two guide members that can be attached to and detached from the guide mounting portion of the slide plate member through the guide through hole, and the at least two guide members are respectively connected to the metering drive unit plate from the slide plate member. When removing the member, remove the metering drive unit plate member. It is preferably configured to id.

  The two-plate injection device according to the present invention includes a heating barrel that is fixed to the fixed plate and has a space into which the screw is inserted, and a material supply hole that communicates with the space on a peripheral surface, and the heating A screw guide member attachable to and detachable from the material supply hole of the barrel; and a screw rotation handle attachable to and detachable from a rear end portion of the screw that is disconnected from the screw rotation support shaft. In the state of being attached to the material supply hole, it has a protruding portion extending between the flights of the screw, and the protruding portion of the screw guide member is inserted between the flights of the screw. By rotating the screw with the screw rotation handle, the screw can be screwed and unscrewed. It is preferred that the.

  The screw pulling method according to the present invention is the screw pulling method in the above-described two-plate injection device, the step of releasing the connection between the screw rotation support shaft and the rear end of the screw, and the slide plate A step of removing the metering drive unit plate member from the member, and a step of pulling out the screw from the rear end side of the screw.

  ADVANTAGE OF THE INVENTION According to this invention, the 2 plate type injection apparatus and screw extraction method which can perform the extraction and restoration of a screw simply and safely can be provided.

It is a figure showing roughly the whole composition of the 2 plate type injection device concerning this embodiment. It is a schematic sectional drawing in the state which looked at the composition of the 2 plate type injection device concerning this embodiment from the plane direction. It is a perspective view which abbreviate | omits a part of structure of the movement plate vicinity, and is shown schematically. It is a disassembled perspective view which abbreviate | omits a structure of a movement plate vicinity and shows roughly. It is the schematic which shows the state with which the screw rotation support shaft and the rear-end part of the screw were connected. It is the schematic which shows the state by which the connection with a screw rotation support shaft and the rear-end part of a screw was cancelled | released. It is the schematic which shows the state which spaces apart a measurement drive unit plate member from a slide plate part along a guide member. It is the schematic which shows the state which attached the screw guide member and the screw rotation handle. It is a top view which shows roughly the structure of the in-line screw type injection apparatus 100 of patent document 1. FIG. It is sectional drawing which shows schematically the structure of the in-line screw type injection apparatus 200 of patent document 2. As shown in FIG.

  DESCRIPTION OF EXEMPLARY EMBODIMENTS Hereinafter, preferred embodiments for carrying out the invention will be described with reference to the drawings. The following embodiments do not limit the invention according to each claim, and all combinations of features described in the embodiments are not necessarily essential to the solution means of the invention. . Further, in the following description, “front” means a direction in which a heating barrel 34 described later of the two-plate injection device 1 protrudes, and “rear” means a direction opposite to this. And

  The two-plate injection device 1 according to the present embodiment is a small sub-injection device that can be retrofitted using an appropriate support member to an injection molding machine (not shown) including a main injection device (not shown). It is. The injection molding machine to which the two-plate type injection device 1 according to the present embodiment is attached can arbitrarily adopt various injection molding machines, for example, a main injection device for a main material, a fixed platen, and a movable platen. A plate and an end platen, a fixed die attached to the fixed platen, a movable die attached to the movable platen, and four tie bars provided through the four corners of the fixed platen, movable platen and end platen A general-purpose injection molding machine that is provided between the movable platen and the end platen and includes a mold clamping mechanism that moves the movable plate forward and backward with respect to the fixed platen can be employed. Since the configuration of the injection molding machine is known, the description thereof is omitted.

  As shown in FIGS. 1 and 2, the two-plate injection device 1 according to this embodiment is a two-plate type inline screw injection device including a fixed plate 10 and a moving plate 20, and is smaller than the main injection device. It is configured.

  Specifically, as shown in FIG. 1 and FIG. 2, the two-plate injection device 1 includes a base portion 2, a fixed plate 10 that is fixedly erected on the base portion 2, and a forward and backward movement with respect to the fixed plate 10. The movable plate 20 provided so as to be able to rotate, the screw 30 supported by the movable plate 20 so as to be rotatable about an axis, the heating barrel 34 fixed to the fixed plate 10, and the movable plate 20 to the fixed plate 10. An injection drive mechanism 40 that moves forward and backward, a metering drive unit 50 that rotates the screw 30, and a control unit (not shown) that controls the injection drive mechanism 40 and the metering drive unit 50 are provided.

  The two-plate injection device 1 is a retrofit member used for pulling out the screw 30 from the heating barrel 34. When the metering drive unit plate member 24 is removed from a slide plate member 22 described later, the metering drive unit plate member 24 is removed. At least two guide members 60 (see FIGS. 4 and 7), a screw guide member 64 (see FIG. 8) detachable from a material supply hole 36 (to be described later) of the heating barrel 34, and a screw rotation support shaft (to be described later). And a screw rotation handle 68 (see FIG. 8) that can be attached to and detached from the rear end 30a of the screw 30 that has been disconnected from the screw 52.

  As shown in FIGS. 1, 3 and 4, the base portion 2 is a long base on which the apparatus main body of the two-plate type injection device 1 can be placed, and along the movable range of the moving plate 20, A pair of rail portions 4 that slidably support a slide plate member 22 (to be described later) of the moving plate 20 are laid. As shown in FIGS. 3 and 4, a notch 6 extending along the movable range of the movable plate 20 from the rear side of the base portion 2 is formed between the pair of rail portions 4. The movable plate 20 is configured to avoid interference with a metering drive unit plate member 24 described later. 3 and 4, the illustration of the injection drive mechanism 40 is omitted.

  As shown in FIG. 1, the fixed plate 10 is a plate-like member fixedly erected on the front side of the base portion 2, and the screw 30 penetrates from the front side surface to the rear side surface. A through-hole 12 is formed. A base end portion of the heating barrel 34 is attached to the front surface of the fixed plate 10 at a position aligned with the through hole 12. An injection motor 46, which will be described later, of the injection drive mechanism 40 is attached to the upper portion of the fixed plate 10 via the attachment member 14.

  As shown in FIGS. 1 to 4, the moving plate 20 includes a slide plate member 22 that can move forward and backward with respect to the fixed plate 10, and a back side of the surface of the slide plate member 22 that faces the fixed plate 10 (that is, the slide plate The metering drive unit plate member 24 is detachably disposed on the rear surface of the member 22.

  As shown in FIGS. 3 and 4, the slide plate member 22 is a plate-like member disposed on the pair of rail portions 4 via the slider 23, and extends from the front surface to the rear surface. An insertion hole 22a into which a cylindrical support portion 24a (to be described later) of the metering drive unit plate member 24 can be inserted, and a pair of mounting holes 22b in which a ball screw nut 42 (to be described later) of the injection drive mechanism 40 is embedded are formed. . The insertion hole 22 a is formed at a position that is coaxial with the screw 30 and the heating barrel 34. The pair of attachment holes 22b are formed at positions separated from each other with the insertion hole 22a as the center.

  Further, as shown in FIG. 7, the rear surface of the slide plate member 22 is screwed into the male screw 62 of the guide member 60 at a position aligned with a guide through-hole 24c described later of the metering drive unit plate member 24. A guide mounting portion (guide mounting hole) 22c having a matable female screw 22d is formed.

  As shown in FIGS. 1 to 4, the metering drive unit plate member 24 is a plate-like member to which the metering drive unit 50 is attached, and is configured to be detachable from the slide plate member 22 by a fastener (not shown). ing. The metering drive unit plate member 24 has a cylindrical support portion 24a extending toward the slide plate member 22, and by inserting the cylindrical support portion 24a into the insertion hole 22a of the slide plate member 22, The slide plate member 22 is configured to be positioned. The metering drive unit plate member 24 has a length in the vertical direction extending below the mounting surface of the base portion 2 in a state where the cylindrical support portion 24a is inserted into the insertion hole 22a of the slide plate member 22. doing.

  The cylindrical support portion 24a of the metering drive unit plate member 24 is formed with a through hole 24b penetrating from the surface facing the fixed plate 10 to the back surface thereof, and a screw rotation described later in the through hole 24b. The support shaft 52 is configured to be supported.

  As shown in FIG. 4, the metering drive unit plate member 24 is formed with at least two guide through holes 24 c penetrating from the surface facing the slide plate member 22 to the back surface thereof. The guide through-hole 24 c is formed at a position corresponding to the vicinity of the corner on the diagonal line of the slide plate member 22.

  As shown in FIG. 1, the metering drive unit 50 includes a screw rotation support shaft 52 that removably supports the rear end 30 a of the screw 30, a metering motor 54, and the power of the metering motor 54. And a rotation transmission mechanism 56 that transmits the screw 30 to the screw 30.

  As shown in FIG. 2, the screw rotation support shaft 52 is configured so that one end is detachably connected to the rear end 30 a of the screw 30 and the other end is connected to the rotation transmission mechanism 56. 52a and a split collar 52b that holds the rear end 30a of the screw 30 between the support body 52a.

  The support portion main body 52a is a shaft member that extends coaxially with the screw 30, and is supported by the through hole 24b of the cylindrical support portion 24a of the metering drive unit plate member 24 through a bearing in a state of being rotatable about the shaft. ing. An engagement hole 53 that can accommodate the rear end portion 30a of the screw 30 is formed at the front end portion of the support portion main body 52a. The engagement hole 53 is a grooved hole having an uneven shape (spline groove, key groove, etc.) on the inner wall corresponding to the uneven shape (spline, key, etc.) of the rear end portion 30 a of the screw 30. It is comprised so that the rear-end part 30a of the screw 30 may be accommodated in a state in which relative rotation is impossible. A driven pulley 56b, which will be described later, of the rotation transmission mechanism 56 is attached to the rear end portion of the support body 52a.

  As shown in FIG. 4, the split collar 52 b is an annular member that is split into two, and has an inner diameter that is smaller than the rear end portion 30 a of the screw 30 and larger than the small-diameter portion 30 b of the screw 30. 1 to 3, the split collar 52b has a front end portion of the engagement hole 53 of the support portion main body 52a in a state where the rear end portion 30a of the screw 30 is accommodated in the engagement hole 53 of the support portion main body 52a. By attaching to the support portion main body 52a, the rear end portion 30a of the screw 30 is sandwiched between the support portion main body 52a and the screw 30 is prevented from falling off.

  As shown in FIG. 1, the weighing motor 54 is attached to the front surface of the weighing drive unit plate member 24 so that the output shaft 54 a extends to the rear surface of the weighing drive unit plate member 24. Yes. As the measuring motor 54, for example, a servo motor can be used.

  As shown in FIG. 1, the rotation transmission mechanism 56 is attached to the drive pulley 56a attached to the output shaft 54a of the metering motor 54 and the rear end of the support portion main body 52a of the screw rotation support shaft 52. A driven pulley 56b and a pulley belt 56c that spans the drive pulley 56a and the driven pulley 56b and rotates the driven pulley 56b by the power of the drive pulley 56a are provided.

  The metering drive unit 50 having the above configuration transmits the rotational force of the metering motor 54 to the screw rotation support shaft 52 via the rotation transmission mechanism 56 and rotates the screw rotation support shaft 52, thereby rotating the screw rotation support shaft. The screw 30 attached to 52 is configured to rotate as a unit.

  As shown in FIGS. 1 and 2, the screw 30 is a screw shaft member in which a spiral flight 30 c is provided in a predetermined region on the distal end side. The rear end portion 30a of the screw 30 is formed to have a larger diameter than the shaft portion (small diameter portion 30b) adjacent thereto, and the engagement hole 53 of the support portion main body 52a of the screw rotation support shaft 52 is formed on the peripheral surface thereof. A concavo-convex shape (such as a spline or a key) corresponding to the concavo-convex shape formed inside is formed. A check ring 30 d for preventing a back flow when the plasticized molten resin is injected from the injection nozzle 34 a of the heating barrel 34 is provided at the tip of the screw 30. The screw 30 is not limited to the illustrated configuration, and various configurations can be adopted.

  The heating barrel 34 is a cylindrical member having a hollow space into which a predetermined region where the flight 30c of the screw 30 is provided is inserted, and a base end portion of the heating barrel 34 extends forward and the fixing plate 10 has a base end portion. It is fixed to. An injection nozzle 34 a is attached to the tip of the heating barrel 34. A material supply hole 36 communicating with the inside of the hollow space is formed on the peripheral surface on the base end side of the heating barrel 34, and a detachable material supply part 38 attached at a position aligned with the material supply hole 36 is provided. Accordingly, a pellet-shaped resin material can be put into the hollow space. Various heating means such as a band heater are disposed on the peripheral surface of the heating barrel 34 and are configured to be heated by the heating means. The heating barrel 34 is not limited to the illustrated configuration, and various configurations can be employed. In addition, the material supply unit 38 may be a general hopper, and when a concentrated material supply system or the like is employed, a fixed pipe or a hose pipe connected to the system may be used. Various configurations that can supply the resin material to the material supply hole 36 and can be attached to and detached from the material supply hole 36 can be employed for one attachment situation.

  As shown in FIG. 2, the injection drive mechanism 40 includes a pair of ball screw mechanisms 41 including a ball screw nut 42 and a ball screw shaft 44, and an injection motor 46 (FIG. 1) for driving the pair of ball screw mechanisms 41. Reference), a drive pulley 48a (see FIG. 1) attached to the output shaft 46a of the injection motor 46, a driven pulley 48b attached to the pair of ball screw shafts 44, a drive pulley 48a and a pair of driven pulleys, respectively. 48b, and a pulley belt 48c that rotates the pair of driven pulleys 48b simultaneously by the power of the driving pulley 48a.

  As shown in FIG. 2, the ball screw nut 42 is embedded in the mounting hole 22 b of the slide plate member 22, and the ball screw shaft 44 is connected to the fixed plate 10 at the front end via a bearing, The vicinity of the other end is screwed into the ball screw nut 42.

  As shown in FIG. 1, the injection motor 46 is provided on the upper portion of the fixed plate 10 via the mounting member 14. The injection motor 46 is attached to the rear surface of the mounting member 14 such that the output shaft 46 a extends to the front surface of the mounting member 14. As the injection motor 46, for example, a servo motor can be used.

  The injection drive mechanism 40 having the above configuration transmits the rotational force of the injection motor 46 to the pair of ball screw shafts 44 via the drive pulley 48a, the pulley belt 48c, and the pair of driven pulleys 48b. By rotating 44 in the forward or reverse direction, the slide plate member 22 and the metering drive unit plate member 24 and the screw 30 connected to the slide plate member 22 are moved forward and backward with respect to the fixed plate 10. In FIGS. 1 and 3 to 7, the ball screw mechanism 41 is not shown in order to make the drawings easy to see.

  The control unit includes, for example, a CPU, a ROM (nonvolatile storage medium) storing various control programs, a readable / writable RAM (volatile storage medium) storing operation results, a storage unit such as a hard disk, a timer, and the like. The computer is configured to execute various processes relating to the injection drive mechanism 40 and the metering drive unit 50 by causing the CPU to execute a control program stored in a ROM or the like.

  As shown in FIGS. 4 and 7, the guide member 60 is a rod-like member in which a male screw 62 that can be screwed into the female screw 22 d of the guide mounting portion 22 c of the slide plate member 22 is formed at the tip. The guide member 60 has an outer diameter that is substantially the same as the inner diameter of the guide through hole 24 c of the metering drive unit plate member 24 and the guide attachment portion 22 c of the slide plate member 22. Further, the guide member 60 is used when the measuring drive unit plate member 24 is separated from the slide plate member 22 in a cantilever state in which the male screw 62 is screwed to the female screw 22d of the guide mounting portion 22c of the slide plate member 22. It has a guideable axial length and rigidity capable of supporting the metering drive unit plate member 24. The guide member 60 is a jig for removing the metering drive unit plate member 24 mainly used when removing the metering drive unit plate member 24 from the slide plate member 22, but is not limited to this, and the metering drive unit plate member 24 is not limited thereto. Can be used as a jig for attaching the slide plate member 22 to the slide plate member 22, or can be used as a permanent support member for supporting the metering drive unit plate member 24 even in a normal state.

  As shown in FIG. 8, the screw guide member 64 is configured to be detachably attached by a fastener to the material supply hole 36 of the heating barrel 34 from which the material supply unit 38 is removed. The screw guide member 64 has a protruding portion 64 a extending between the flights 30 c of the screw 30 in a state where the screw guide member 64 is attached to the material supply hole 36. Specifically, the protrusion 64a has a length in which the tip end portion is positioned closer to the rotation center axis side of the screw 30 than the outer diameter of the flight 30c of the screw 30 in a state of being attached to the material supply hole 36. ing. The screw guide member 64 is preferably formed of a material that is more flexible than the flight 30c of the screw 30, for example, a resin material, and is configured to be replaceable.

  As shown in FIG. 8, the screw rotation handle 68 includes a fixing portion 68a that is detachably attached to the rear end portion 30a of the screw 30 from which the screw rotation support shaft 52 is removed, and extends in a direction away from the fixing portion 68a. And a handle portion 68b formed out. The fixed portion 68a is formed with a grooved hole having an uneven shape (spline groove or key groove) on the inner wall corresponding to the uneven shape (spline or key etc.) of the rear end portion 30a of the screw 30. The rear end portion 30a of the screw 30 is accommodated in the grooved hole in a state in which relative rotation is impossible.

  The screw guide member 64 and the screw rotation handle 68 cooperate with each other by rotating the screw 30 with the screw rotation handle 68 in a state where the protruding portion 64a of the screw guide member 64 is inserted between the flights 30c of the screw 30. The screw 30 is configured to be able to move forward and backward by working. Note that the screw guide member 64 and the screw rotation handle 68 are mainly a jig for extracting the screw 30 that is used when the screw 30 is pulled out. However, the screw guide member 64 and the screw rotating handle 68 are not limited to this, and are not limited to this. It can also be used as a jig.

  The two-plate injection device 1 having the above configuration rotates the screw 30 by the metering drive unit 50 in a state where the screw 30 is positioned at the control advance limit position (the limit advance position on the control of the screw 30). The resin material in the heating barrel 34 charged from the material supply unit 38 is conveyed toward the tip side of the screw 30, and in this conveyance process, by a heating means (not shown) disposed on the outer periphery of the heating barrel 34. The resin material is plasticized (melted) by heat and shear heat generated by the rotation of the screw 30 (plasticization control). In addition, the two-plate injection device 1 is stored in a space (reservoir) between the distal end portion of the screw 30 and the inner wall on the distal end side of the heating barrel 34 in parallel with plasticization control (rotation of the screw 30). When the screw 30 is retracted to a predetermined measurement completion position (that is, 1 is stored in the storage unit), the screw 30 is allowed to move backward with a predetermined backward resistance force (back pressure). The rotation and movement of the screw 30 are stopped (measurement control) when the amount of resin necessary for one injection filling is stored). Furthermore, the two-plate injection device 1 advances the screw 30 at a predetermined injection speed by the injection drive mechanism 40 after the metering control (injection speed control), and the timing or position at which the mold cavity is filled with the resin material The forward movement of the screw 30 is switched to pressure control at (VP switching point), and the forward movement of the screw 30 up to the control forward limit position is maintained at a predetermined injection pressure (injection pressure control and pressure holding control). Since these plasticization control, metering control, injection speed control, injection pressure control, and pressure holding control executed in one molding cycle are all known, detailed description thereof will be omitted.

  Further, the two-plate injection device 1 according to the present embodiment has a screw rotation support shaft 52 and a rear end of the screw 30 when it is necessary to take out the screw 30 from the heating barrel 34 for cleaning, inspection, replacement, or the like. The screw 30 can be pulled out from the rear end 30 a side of the screw 30 by releasing the connection with the portion 30 a and removing the metering drive unit plate member 24 from the slide plate member 22. At this time, the metering drive unit 50 disposed on the metering drive unit plate member 24 is also removed as a unit with the metering drive unit plate member 24. In the two-plate injection device 1, when removing the metering drive unit plate member 24 from the slide plate member 22, it is necessary to disconnect the power wiring and control wiring of the metering drive unit 50. It is preferable to provide a connector at the separation point of the wiring.

  Next, a method of pulling out the screw 30 in the two-plate injection device 1 according to this embodiment will be described with reference to FIGS.

  The screw pulling method according to the present embodiment is generally a step of releasing the connection between the screw rotation support shaft 52 and the rear end 30a of the screw 30 after purging (discharging) the resin material in the heating barrel 34. (Screw releasing step), a step of removing the metering drive unit plate member 24 from the slide plate member 22 (plate removing step), and a step of pulling out the screw 30 from the rear (screw pulling step). Hereinafter, each step will be described in detail. In the present embodiment, the two-plate injection device 1 is arranged in the horizontal direction, and the screw 30 is pulled out rearward.

[Screw release process]
FIG. 5 shows a state before executing the screw pulling method according to the present embodiment, that is, the rear end portion 30a of the screw 30 is sandwiched by the support portion main body 52a and the split collar 52b of the screw rotation support shaft 52, thereby The state where the rotation support shaft 52 and the rear end portion 30a of the screw 30 are connected is illustrated. In the screw drawing method according to the present embodiment, first, the split collar 52b is removed from the support body 52a as shown in FIG. 6 from the state shown in FIG. As a result, the connection between the screw rotation support shaft 52 and the rear end 30a of the screw 30 is released, and the screw rotation support shaft 52 and the screw 30 can be separated.

[Plate removal process]
Next, in the screw pulling method according to the present embodiment, as shown in FIG. 7, a pair of guide members 60 is connected to the guide mounting portion 22 c of the slide plate member 22 through the guide through hole 24 c of the measuring drive unit plate member 24. Then, the male screw 62 of each guide member 60 is screwed into the female screw 22d of the slide plate member 22. Further, the fastening of the slide plate member 22 and the metering drive unit plate member 24 is released. Then, in a state where the vertical load of the metering drive unit plate member 24 is supported by the pair of guide members 60, the metering drive unit plate member 24 is separated from the slide plate member 22 along the pair of guide members 60. As a result, the screw rotation support shaft 52 is removed from the rear end 30 a of the screw 30, and the metering drive unit plate member 24 is removed from the slide plate member 22.

[Screw extraction process]
And finally, in the screw drawing method according to the present embodiment, as shown in FIG. 8, the material supply unit 38 is removed from the heating barrel 34, and the protruding portion 64 a is inserted between the flights 30 c of the screw 30. A screw guide member 64 is attached to the material supply hole 36 of 34. Further, the screw rotation handle 68 is attached to the rear end portion 30a of the screw 30 from which the screw rotation support shaft 52 is removed. Then, in a state where the protruding portion 64 a of the screw guide member 64 is inserted between the flights 30 c of the screw 30, the screw 30 is rotated by the screw rotation handle 68, and the screw 30 is screwed out. Thereby, the screw 30 can be pulled out from the back.

  In addition, after performing the cleaning, inspection, replacement | exchange, etc. about the pulled-out screw 30, the screw 30 can be accommodated in the heating barrel 34 by performing the reverse process to the process mentioned above.

  As described above, the two-plate injection device 1 according to the present embodiment releases the connection between the screw rotation support shaft 52 and the rear end 30a of the screw 30 and removes the metering drive unit plate member 24 from the slide plate member 22. Since the screw 30 can be pulled out from the rear side by being removed, the screw 30 can be pulled out easily and safely.

  That is, except for the case where the inside of the tip of the heating barrel 34 is cleaned and inspected, according to the two-plate injection device 1 according to this embodiment, the screw such as the injection nozzle 34a is not removed from the heating barrel 34, and the screw Since it is possible to pull out the screw 30 from the heating barrel 34 without directly touching 30, it is possible to reduce the risk of workers being burned. Further, since the slide plate member 22 and the metering drive unit plate member 24 are disposed at a location away from the heat source (the heating means of the heating barrel 34), the risk of problems such as seizure due to thermal expansion of the injection nozzle 34a and the like is avoided. can do. Furthermore, compared with the conventional inline screw type injection device 100 that pulls out the screw from the front, there is an advantage that a mechanism and a space for turning the entire device and a mechanism and a space for pulling out the screw from the front become unnecessary. . In addition, the screw drive unit plate member 24 is removed from the slide plate member 22 so that the screw 30 can be pulled out rearward by a simple structure and operation. Compared with the inline screw injection device 200 of Patent Document 2. In addition, it is not necessary to employ a special ball screw shaft 208 having a hollow structure, the overall configuration of the apparatus can be simplified, and various restrictions that have occurred in the inline screw injection apparatus 200 of Patent Document 2 can be achieved. Has the advantage of not receiving.

  Further, the two-plate injection device 1 according to the present embodiment is configured such that the metering drive unit 50 is disposed on the metering drive unit plate member 24 and is detached from the slide plate member 22 integrally with the metering drive unit plate member 24. Has been. According to the two-plate type injection device 1 according to the present embodiment, by having such a configuration, the operation of removing the pulley belt 56c from the driving pulley 56a and the driven pulley 56b, the reworking operation, and the reworking operation. Since the tension of the subsequent pulley belt 56c and the synchronous adjustment work are not necessary, the screw can be pulled out and restored more easily.

  Further, in the two-plate injection device 1 according to this embodiment, the metering drive unit plate member 24 has the cylindrical support portion 24a, and the slide plate member 22 has the insertion hole 22a, so that the metering with respect to the slide plate member 22 is performed. The driving unit plate member 24 can be easily positioned.

  Further, the two-plate injection device 1 according to the present embodiment includes a guide member 60 that can be attached to and detached from the guide attachment portion 22c of the slide plate member 22 through the guide through hole 24c of the metering drive unit plate member 24. When the metering drive unit plate member 24 is removed from the slide plate member 22, the metering drive unit plate member 24 can be guided. In particular, when the two-plate injection device 1 is disposed horizontally with respect to the mold as in the present embodiment, it is prevented that the metering drive unit plate member 24 is dropped from the slide plate member 22 horizontally. Therefore, crane operation and manual removal and restoration are facilitated, and the screw can be pulled out and restored more easily.

  Further, when the two-plate injection device 1 is arranged in the vertical direction with respect to the mold, the horizontal movement when the measuring drive unit plate member 24 is separated from the slide plate member 22 in the vertical direction is prevented. This makes it possible to prevent the weighing drive unit 50 (the weighing drive unit plate member 24) from coming into contact with surrounding equipment and components during crane operation and manual removal and restoration, thereby damaging both. The possibility of making it possible can be reduced.

  Further, the two-plate injection device 1 according to the present embodiment includes a screw guide member 64 and a screw rotation handle 68, and in a state where the protruding portion 64a of the screw guide member 64 is inserted between the flights 30c of the screw 30, The screw 30 is rotated by the screw rotation handle 68 so that the screw 30 can be screwed and screwed. By providing such a configuration, the two-plate injection device 1 according to the present embodiment can easily perform the work of manually pulling out the screw 30. Further, when the two-plate injection device 1 is arranged in the vertical direction and the screw 30 is pulled upward, it is possible to prevent the screw 30 from falling.

  Here, in the case where the two-plate injection device 1 is arranged in the horizontal direction and the screw 30 is pulled out rearward, there is no possibility of the screw 30 dropping, so the screw guide member 64 is not necessarily attached to the material supply hole 36. There is no need, and only the screw rotation handle 68 may be attached to the screw 30 and the screw 30 may be pulled out rearward. On the other hand, when the two-plate injection device 1 is arranged in the vertical direction and the screw 30 is pulled upward (rearward), manual pulling by the screw rotary handle 68 is difficult due to reasons such as weight and work space Before releasing the connection between the screw rotation support shaft 52 and the rear end 30 a of the screw 30, the screw guide member 64 is attached to the material supply hole 36 and the screw 30 is prevented from falling. Thereafter, a wire or the like is attached to the screw rotation handle 68 so that the vertical load of the screw 30 can be supported by a crane or the like, and then the connection between the screw rotation support shaft 52 and the rear end 30a of the screw 30 is released. It is preferable to pull it out slowly. Depending on the weight of the screw 30, the manual pulling out may be abandoned from the beginning, and a lifting member that can be lifted by a crane hook or the like may be attached instead of the screw rotating handle 68. These forms may be adopted when the screw 30 is pulled out rearward.

  When the two-plate injection device 1 is disposed obliquely with respect to the mold (when disposed at an angle between the horizontal direction and the vertical direction), the metering drive unit plate member 24 is moved from the slide plate member 22. When removing, the load acting on the guide member 60 for guiding the metering drive unit plate member 24 varies depending on the angle. Even when the screw 30 is pulled out, the load when the screw 30 is supported, the necessity and importance of a fall prevention measure are different. Therefore, the removal of the metering drive unit plate member 24 and the extraction and restoration of the screw 30 are performed appropriately after understanding the functions of the guide member 60, the screw guide member 64 and the screw rotating handle 68 as described above. Should be done.

  The preferred embodiment of the present invention has been described above, but the technical scope of the present invention is not limited to the scope described in the above-described embodiment. Various modifications or improvements can be added to the above embodiments.

  In the above-described embodiment, the two-plate injection device 1 has been described as a small sub-injection device that can be retrofitted to an injection molding machine including a main injection device, but is not limited thereto. For example, It may be a main injection device of an injection molding machine.

  In the above-described embodiment, the screw 30 has been described as being housed in the heating barrel 34. However, the present invention is not limited to this. For example, a hot runner is provided in a mold or the like to which the two-plate injection device 1 is attached. It is good also as a structure which directly accommodates the screw 30 in a runner.

  In the above-described embodiment, the rotation transmission mechanism 56 of the metering drive unit 50 has been described as including the drive pulley 56a, the driven pulley 56b, and the pulley belt 56c. However, the present invention is not limited to this, and various rotation transmission mechanisms are employed. It is possible. For example, a chain type transmission mechanism constituted by a gear and a chain may be adopted, or a gear type transmission mechanism constituted only by a gear may be adopted. Even when such a chain-type transmission mechanism or a gear-type transmission mechanism is adopted, it is possible to remove and re-hang (chain) by adopting a configuration in which it is removed from the slide plate member 22 integrally with the metering drive unit plate member 24. In this case, the tension (in the case of a chain) after the reworking operation and the synchronous adjustment work are not necessary, so that the screw can be pulled out and restored easily.

  In the above-described embodiment, the front end portion of the ball screw shaft 44 is rotated and supported on the fixed plate 10 side together with the driven pulley 48b, and the rear end portion is screwed onto the ball screw nut 42 disposed on the moving plate 20. The driven pulley 48b is belt-driven by the injection motor 46 disposed on the fixed plate 10 side to rotate the ball screw shaft 44 to move the moving plate 20 forward and backward. However, the present invention is not limited to this. Instead, various configurations can be employed. For example, instead of the above configuration, the ball screw nut 42 is rotatably supported on the fixed plate 10 side, and the rear end portion of the ball screw shaft 44 is fixed to the moving plate 20 in a state in which it cannot rotate, advance, or retract. At the same time, the front end is screwed into the ball screw nut 42 on the fixed plate 10 side, and the ball screw nut 42 is driven to rotate by the injection motor 46 disposed on the fixed plate 10 side. It may be configured to move forward and backward. In addition, the ball screw nut 42 is rotatably supported on the moving plate 20 side, and the front end of the ball screw shaft 44 is fixed to the fixed plate 10 in a state in which it cannot rotate / advance / retreat. An end portion is screwed into a ball screw nut 42 on the moving plate 20 side, and the ball screw nut 42 is rotationally driven by an injection motor 46 disposed on the moving plate 20 side, thereby moving the moving plate 20 forward and backward. Also good. Further, the ball screw nut 42 is fixed to the fixed plate 10 in a state where it cannot be rotated / advanced / retracted, and the rear end of the ball screw shaft 44 is rotated and supported by the movable plate 20 together with the driven pulley 48b. The front end is screwed into the ball screw nut 42 on the fixed plate 10 side, and the driven pulley 48b is belt-driven by the injection motor 46 disposed on the moving plate 20 side, thereby moving the moving plate 20 forward and backward. It is good also as a structure made to do.

  In the embodiment described above, the fixed plate 10 is a plate-like member fixedly erected on the front side of the base portion 2, and the moving plate 20 (slide plate member 22) is a pair of rails via the slider 23. Although it has been described that the plate-like member is disposed on the portion 4 and the rail portion 4 is also disposed on the base portion 2, the present invention is not limited to this, and various configurations can be employed. For example, instead of the above configuration, the fixed plate itself includes the function of the base part, and is directly attached to the mold, and the movable plate guides the movement by a guide member that extends from the fixed plate to the movable plate side. It may be configured.

  It is clear from the description of the scope of claims that the above modifications are included in the scope of the present invention.

  1 2 plate type injection device, 10 fixed plate, 20 moving plate, 22 slide plate member, 22a insertion hole, 22c guide mounting part, 24 metering drive unit plate member, 24a cylindrical support part, 24b through hole, 24c guide through hole Hole, 30 screw, 30a screw rear end, 34 heating barrel, 36 material supply hole, 52 screw rotation support shaft, 54 metering motor, 56 rotation transmission mechanism, 50 metering drive unit, 60 guide member, 64 screw guide member 68 Screw rotation handle

Claims (6)

A fixed plate, a movable plate provided to be movable relative to the fixed plate, and a screw supported by the movable plate so as to be rotatable about an axis, the movable plate being attached to the fixed plate A two-plate injection device in which the screw can be advanced and retracted by advancing and retracting,
The moving plate includes a slide plate member that can move forward and backward with respect to the fixed plate, and a metering drive unit plate member that is detachably disposed on the back side of the surface of the slide plate member that faces the fixed plate,
The metering drive unit plate member includes a screw rotation support shaft that detachably supports the rear end of the screw, a metering motor, and the power of the metering motor to the screw via the screw rotation support shaft. A metering drive unit including a rotation transmission mechanism for transmitting, and
The screw rotation support shaft and the rear end of the screw are disconnected, and the metering drive unit plate member is removed from the slide plate member, so that the screw can be pulled out from the rear end side of the screw. A two-plate injection device characterized in that The moving plate is formed with a through hole penetrating from the surface facing the fixed plate to the back surface thereof,
The screw rotation support shaft is provided in the through-hole so as to be rotatable about an axis, one end portion is detachably connected to the rear end portion of the screw, and the other end portion is the rotation transmission mechanism. The two-plate injection device according to claim 1, wherein the two-plate injection device is configured to be coupled to the two-plate injection device. The metering drive unit plate member has a cylindrical support portion extending toward the slide plate member, and the through hole is formed in the cylindrical support portion,
The slide plate member has an insertion hole into which the cylindrical support portion can be inserted,
The metering drive unit plate member is configured to be positioned with respect to the slide plate member by inserting the cylindrical support portion of the metering drive unit plate member into the insertion hole of the slide plate member. The two-plate injection device according to claim 2. The metering drive unit plate member is formed with at least two guide through holes penetrating from the surface facing the slide plate member to the back surface thereof,
The slide plate member has guide mounting portions formed at positions aligned with the guide through-holes of the metering drive unit plate member,
The two-plate injection device further includes at least two guide members that can be attached to and detached from the guide mounting portion of the slide plate member via the guide through hole of the metering drive unit plate member,
The at least two guide members are each configured to guide the metering drive unit plate member when the metering drive unit plate member is removed from the slide plate member. The two-plate injection device according to any one of the above. A heating barrel that is fixed to the fixing plate and has a space into which the screw is inserted, and a material supply hole that communicates with the space on the peripheral surface;
A screw guide member removable from the material supply hole of the heating barrel;
A screw rotation handle that can be attached to and detached from a rear end of the screw that has been disconnected from the screw rotation support shaft;
The screw guide member has a protrusion that extends between flights of the screw in a state of being attached to the material supply hole,
In a state where the protruding portion of the screw guide member is inserted between the flights of the screw, the screw is rotated and screwed by rotating the screw by the screw rotating handle. The two-plate injection device according to any one of claims 1 to 4, wherein the two-plate injection device is provided. A method for pulling out the screw in the two-plate injection device according to any one of claims 1 to 5,
Releasing the connection between the screw rotation support shaft and the rear end of the screw;
Removing the metering drive unit plate member from the slide plate member;
A step of pulling out the screw from the rear end side of the screw.

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