JP4636977B2 - Total height adjustment method of vertical injection molding machine - Google Patents

Description

  The present invention relates to a total height adjustment method for a vertical injection molding machine having a configuration in which a vertical injection unit is mounted on a vertical mold opening / closing unit, and in particular, when the vertical injection molding machine is conveyed, The present invention relates to a technology that makes it possible to reduce the size.

  A vertical injection molding machine equipped with a vertical injection unit on a vertical mold opening / closing unit has a large overall height due to its structure, so it cannot be stored in a standard container as it is when exported by ship, etc. It was. For this reason, it has been forced to carry out dedicated transportation or to disassemble and transport the injection unit.

  However, there is a problem that it takes cost and time to carry out dedicated transportation as described above, and when the injection unit is disassembled and transported as described above, it takes time to disassemble / assemble, Adjustment and installation adjustment must be performed by a familiar worker, and in this case as well, there is a problem that costs and time are required.

Therefore, in a vertical injection molding machine, when transporting, part of the screw shaft (screw / spline shaft) of the ball screw mechanism for nozzle touch is housed in a holding member mounted on the die plate, thereby reducing the overall height. The technique made to do is described in Patent Document 1.
JP 2004-243687 (paragraph number 0028, FIG. 6)

  However, in the technique disclosed in Patent Document 1, the holding plate (heating cylinder holding plate) holding the heating cylinder is lowered by its own weight in order to take the posture at the time of conveyance, and the member is damaged. It takes a method of concern. In addition, since the transfer is performed with the spacer plate held between the holding plate (heating tube holding plate) and the holding member mounted on the die plate, the holding plate is caused by a large shaking or impact during transfer. There is a risk that the member will be damaged due to the (heating tube holding plate) being displaced, and if the position of the holding plate is displaced, it is necessary to correct the displacement of the holding plate at the transport destination.

  The present invention has been made in view of the above points, and an object thereof is to provide a height for conveyance in a vertical injection molding machine capable of reducing the overall height without disassembling the injection unit. The (full height) adjustment can be easily and reliably performed without damaging the member, and the heating cylinder holding plate is prevented from moving during conveyance.

To achieve the above object, the present invention provides a die plate to which an upper mold can be attached to the lower surface side thereof, a hollow base bracket having a lower portion fixed to the upper surface side of the die plate, and an upper surface of the base bracket. A screw shaft of a ball screw mechanism for nozzle touch, the lower end of which is fixed to the side, and a nut body of the ball screw mechanism screwed to the screw shaft are rotatably held, and the screw is rotated by rotating the nut body. A heating cylinder holding plate that can move up and down along an axis, a nozzle touch servomotor that moves the heating cylinder holding plate up and down via the ball screw mechanism for nozzle touch, and a base end portion of the heating cylinder holding plate Holding the heating cylinder and the base end of the screw that can rotate and move up and down within the heating cylinder, and is guided by the screw shaft of the ball screw mechanism for nozzle touch. A linear plate that can move up and down integrally with the screw, an injection servo motor that is a drive source for moving the linear plate up and down, and bolts around a through hole formed in the upper surface of the base bracket In addition, in the overall height adjustment method of the vertical injection molding machine, the mounting metal fitting that bolts the end surface of the screw shaft of the ball screw mechanism for the nozzle touch,
When transporting the vertical injection molding machine,
As the state where the linear motion plate is lowered most with respect to the heating cylinder holding plate by the injection servo motor, the heating cylinder holding plate is raised by the nozzle touch servo motor in this state,
Next, the upper part of the transport bracket for supporting the weight of the injection unit is bolted to the lower surface of the heating cylinder holding plate,
Next, the heating cylinder holding plate is lowered by the nozzle touch servomotor so that the lower part of the transfer bracket is brought into contact with the upper surface of the base bracket or the upper surface of the die plate, and then the transfer bracket Bolt the lower part to the upper surface of the base bracket or the upper surface of the die plate,
Next, after removing the bolt that connects the mounting bracket and the end surface of the screw shaft of the ball screw mechanism for nozzle touch, the screw shaft of the ball screw mechanism for nozzle touch is held in a heating cylinder by the servo motor for nozzle touch. Raised against the plate, then remove the mounting bracket,
Next, the screw shaft of the nozzle touch ball screw mechanism is lowered with respect to the heating cylinder holding plate by the nozzle touch servomotor, and a part of the screw shaft is stored in the base bracket,
Reduce the overall height of the vertical injection molding machine.

  According to the present invention, the guide shaft for linear movement of the linear motion plate in which the screw shaft of the ball screw mechanism for nozzle touch that performs the nozzle touch / nozzle back operation moves backward (rises) in the measurement stroke and moves forward (falls) in the injection stroke. In this configuration, the number of parts can be reduced. However, when the screw shaft of the ball screw mechanism for nozzle touch is long and protrudes upward, it is used for nozzle touch when transporting a vertical injection molding machine. Part of the screw shaft of the ball screw mechanism can be housed in a hollow base bracket, so that the overall height can be reduced without disassembling the injection unit, and it can be stored in a standard container. Since the vertical movement of each member when adjusting the overall height of the mold injection molding machine is all driven by a motor, the overall height adjustment for conveyance is easy and reliable without damaging the member. For example, also, during transportation, since the heating cylinder retention plate is in the state of being fixed and integrated with the base bracket or die plate via a conveyor bracket and there is no risk moving displacement heating cylinder retention plate during transport.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.
1 to 6 relate to a vertical injection molding machine (hereinafter referred to as a machine) according to an embodiment of the present invention (hereinafter referred to as the present embodiment), and FIG. 1 is mainly injection of the machine according to the present embodiment. It is explanatory drawing which shows the structure of a unit, The figure has shown the state used for a shaping | molding driving | operation.

  In FIG. 1, 1 is a vertical injection unit mounted on a vertical mold opening / closing unit, 2 is a component of the vertical mold opening / closing unit, and is located at the top of the vertical mold opening / closing unit. It is a die plate, and an upper mold (not shown) is attached to the lower surface side of the die plate 2.

  Reference numeral 3 denotes a hollow base bracket whose lower part is fixed to the upper surface side of the die plate 2, and a central hole 3 a through which the heating cylinder 5 provided with a nozzle 6 at its tip is inserted on the upper surface of the base bracket 3. It has been drilled. Reference numeral 4 denotes a heating cylinder holding plate that holds the base end portion of the heating cylinder 5. A nut body 7 a of a ball screw mechanism 7 for nozzle touch is rotatably held on the heating cylinder holding plate 4. A screw shaft 7b of the ball screw mechanism 7 is screwed to 7a. Three ball screw mechanisms 7 are provided at 120 ° angular intervals around the heating cylinder 5, and the lower end portions of the screw shafts 7 b of the ball screw mechanisms 7 are respectively fixed to the upper surface side of the base bracket 3. The upper end side of the screw shaft 7b is fixed to the connection bracket 10, respectively. In the present embodiment, the screw shaft 7b of the ball screw mechanism 7 is formed so that the spiral groove for the ball screw mechanism and the linear groove for the ball spline mechanism cross, and the screw shaft 7b has the function of the screw shaft. It also has a function as a ball spline shaft. Each screw shaft 7b is spline-shaft-coupled (ball spline-coupled) to a spline outer cylinder 8 fixed to the heating cylinder holding plate 4 and a spline outer cylinder 9 fixed to a linear motion plate 13 described later. Thus, the screw shaft 7b is configured to be able to move in the axial direction relatively to the heating cylinder holding plate 4 and the linear motion plate 13 described later, but not to rotate.

  Reference numeral 11 denotes a nozzle touch servomotor mounted on the heating cylinder holding plate 4. The rotation of the nozzle touch servomotor 11 is transmitted to each driven pulley 12 that rotates integrally with the nut body 7 a of each ball screw mechanism 7. Thus, when the nut body 7a is rotated, the heating cylinder holding plate 4 is driven downward or driven integrally with the nut body 7a.

  Reference numeral 13 denotes a linear motion plate that is inserted through the screw shaft 7b of each ball screw mechanism 7 for nozzle touch and can be moved up and down while being guided by the screw shaft 7b. The linear motion plate 13 rotates and moves within the heating cylinder 5. A base end portion of the screw 14 disposed so as to be movable up and down is rotatably held. 15 is a measuring servo motor mounted on the linear motion plate 13, and the rotation of the measuring servo motor 15 is transmitted to a driven pulley 16 fixed to a rotating member (not shown) that rotates integrally with the screw 14. Thus, the screw 14 is driven to rotate.

  Reference numeral 17 denotes a pair of injection ball screw mechanisms. The nut body of each ball screw mechanism 17 is fixedly held on the heating cylinder holding plate 4, and the screw shaft of each ball screw mechanism 17 screwed to each nut body is a linear plate. 13 is rotatably held. Reference numeral 18 denotes an injection servo motor mounted on the linear motion plate 13. The rotation of the injection servo motor 18 is transmitted to each driven pulley 19 that rotates integrally with the screw shaft of each ball screw mechanism 17. When the rotation of the injection servo motor 18 is transmitted to the screw shaft, and the screw shaft rotates, the screw shaft linearly moves with respect to the nut body of the heating cylinder holding plate 4 that is stopped at a predetermined position. The linear motion plate 13 (that is, the screw 5) is driven downward or upward integrally with the screw shaft of the ball screw mechanism 17.

  Reference numeral 20 denotes a cover that is attached to the heating cylinder holding plate 4 and moves up and down integrally with the heating cylinder holding plate 4. The screw shaft 7 b of the ball screw mechanism 7 for nozzle touch is loosely inserted into the cover 20. A through hole is formed.

  In the configuration shown in FIG. 1, during the molding operation, the nozzle touch servomotor 11 is rotationally driven in a predetermined direction to lower the heating cylinder holding plate 4, and the nozzle 6 at the tip of the heating cylinder 5 is not shown in the upper mold. The pressed state is maintained by the nozzle touch servomotor 11. During the metering stroke of the molding operation, the metering servo motor 15 is rotated in a predetermined direction and the screw 14 is rotationally driven to knead and plasticize the resin material supplied to the proximal end side of the heating cylinder 5. As a result, the screw 14 is retreated (raised) together with the linear motion plate 13 as molten resin is stored on the tip side of the screw 14. Then, while controlling the pressure (back pressure) applied to the molten resin at this time by the servo motor 18 for injection, the rotation of the screw 14 and the retreat accompanying the rotation are executed, and one shot is placed on the tip side of the screw 14. When the molten resin is stored, the rotation of the measuring servo motor 15 is stopped. Further, during the injection stroke of the molding operation, the injection servomotor 18 is rotationally driven in a predetermined direction, and the screw 14 is rapidly advanced (rapidly lowered) together with the linear motion plate 13, and from the nozzle 6 at the tip of the heating cylinder 5 to the mold. The molten resin is injected and filled into the mold cavity in the clamped state.

  FIG. 2 is a view showing a mounting structure of the lower end portion of the screw shaft 7b of the ball screw mechanism 7 for nozzle touch. In FIG. 2, 3b is a circular through hole drilled at a position corresponding to the lower end of the screw shaft 7b on the upper surface of the base bracket 3, and the diameter of the through hole 3b is larger than the diameter of the screw shaft 7b. Is set. Reference numeral 21 denotes an attachment fitting attached to the upper surface of the base bracket 3 with a bolt 22 so as to close the through hole 3b. The lower end face of the screw shaft 7b is attached to the attachment fitting 21 with a bolt 23.

  FIG. 3 is a diagram showing a transport bracket used when transporting the machine according to the present embodiment. The conveying bracket 31 shown in FIG. 3 includes a lower plate portion 31a that makes contact with the upper surface of the base bracket 3, an upper plate portion 31b that makes contact with the lower surface of the heating cylinder holding plate 4, a lower plate portion 31a, and an upper plate portion. The lower plate portion 31a and the upper plate portion 31b are provided with bolt insertion holes 31d.

  Next, a procedure for causing the injection unit 1 of the machine to take a posture for conveyance when conveying the machine according to the present embodiment will be described with reference to FIGS. 4 to 6, a part of the heating cylinder 5 is omitted, and the attachment state of the attachment fitting 21 is shown.

  (1) First, the linear motion plate 13 is placed in the injection advance limit position (that is, the linear motion plate 13 is lowered most with respect to the heating cylinder holding plate 4 by the injection servo motor 18). Then, the servo motor 11 for nozzle touch is rotationally driven in the nozzle back direction to raise the heating cylinder holding plate 4. Then, as shown in FIG. 4, the upper plate portion 31 b of the transport bracket 31 is attached to the lower surface side of the heating cylinder holding plate 4 by temporary fixing bolts 32.

  (2) Next, the servo motor 11 for nozzle touch is rotationally driven in the nozzle touch direction, and the heating cylinder holding plate 4 is lowered until the lower plate portion 31a of the transport bracket 31 contacts the upper surface of the base bracket 3. . Then, as shown in FIG. 5, the lower plate portion 31 a of the transport bracket 31 is attached to the upper surface side of the base bracket 3 with a temporary fixing bolt 32. Thereby, the weight of the injection unit 1 is supported by the base bracket 3 via the transport bracket 31.

  (3) Next, the bolt 23 which fixes the lower end surface of the screw shaft 7b is removed. As a result, the screw shaft 7b can move upward. At this time, the bolt 22 fixing the mounting bracket 21 is also removed.

  (4) Next, the nozzle touch servomotor 11 is rotationally driven in the nozzle touch direction. Since the heating cylinder holding plate 4 which is heavy is on the conveyance bracket 31 and the lower end side of the screw shaft 7b is in a free state, when the nozzle touch servomotor 11 rotates in the nozzle touch direction, the screw shaft 7b rises.

  (5) Next, the mounting bracket 21 is removed from the upper surface of the base bracket 3, and the through hole 3 b on the upper surface of the base bracket 3 is set in a passage free state. At this time, the connecting bracket 10 that connects and fixes the upper end side of each screw shaft 7b is also removed.

  (6) Finally, the nozzle touch servomotor 11 is rotationally driven in the nozzle back direction to lower the screw shaft 7b, and a part of the screw shaft 7b is accommodated in the base bracket 3. Accordingly, as shown in FIG. 6, the screw shaft 7b is lowered so that the upper end surface of the screw shaft 7b is equal to or lower than the upper surface plate portion of the cover 20, and the overall height of the machine can be reduced.

  Needless to say, after the transportation, the injection unit 1 may be restored to the state before the transportation by the reverse procedure.

  In the above-described example, the lower plate portion 31a of the transport bracket 31 is bolted to the upper surface of the base bracket 3. However, the height of the transport bracket is set higher than that shown in FIG. The lower plate portion of the bracket for mounting may be bolted to the upper surface of the die plate 2.

  As described above, according to the present embodiment, the screw shaft 7b of the ball screw mechanism 7 for nozzle touch that performs the nozzle touch / nozzle back operation moves back (rises) during the measurement stroke and moves forward (falls) during the injection stroke. Although the plate 13 also serves as a guide shaft for linear movement of the plate 13, the number of parts can be reduced. However, in the configuration in which the screw shaft 7b of the ball screw mechanism 7 for nozzle touch is long and protrudes upward, During transportation, a part of the screw shaft 7b of the ball screw mechanism 7 for nozzle touch can be partially stored in the hollow base bracket 3, so that the overall height can be reduced without disassembling the injection unit 1, and a standard container In addition, since the vertical movement of each member when adjusting the overall height of the machine is all driven by a motor, the overall height adjustment for transportation damages the member. The heating cylinder holding plate 4 is fixed and integrated with the base bracket 3 or the die plate 2 via the transport bracket 31 during transport. There is no possibility that the heating cylinder holding plate 4 is displaced.

It is explanatory drawing which mainly shows the structure of the injection unit of the vertical injection molding machine which concerns on one Embodiment of this invention. It is explanatory drawing which shows the attachment structure of the lower end part of the screw shaft of the ball screw mechanism for nozzle touch in the vertical injection molding machine which concerns on one Embodiment of this invention. It is explanatory drawing which shows the bracket for conveyance used at the time of conveyance in the vertical injection molding machine which concerns on one Embodiment of this invention. It is explanatory drawing which shows the procedure of the total height adjustment in the case of the conveyance in the vertical injection molding machine which concerns on one Embodiment of this invention. It is explanatory drawing which shows the procedure of the total height adjustment in the case of the conveyance in the vertical injection molding machine which concerns on one Embodiment of this invention. It is explanatory drawing which shows the procedure of the total height adjustment in the case of the conveyance in the vertical injection molding machine which concerns on one Embodiment of this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Injection unit 2 Die plate 3 Base bracket 3a Center hole 3b Through-hole 4 Heating cylinder holding plate 5 Heating cylinder 6 Nozzle 7 Ball screw mechanism for nozzle touch 7a Nut body 7b Screw shaft 8, 9 Spline outer cylinder body 10 Connection bracket 11 Nozzle Touch servo motor 12 Driven pulley 13 Direct drive plate 14 Screw 15 Weighing servomotor 16 Driven pulley 17 Injection ball screw mechanism 18 Injection servomotor 19 Driven pulley 20 Cover 21 Mounting bracket 22, 23 Bolt 31 Transport bracket 31a Bottom Plate portion 31b Upper plate portion 31c Connecting portion 31d Bolt insertion hole 32 Temporary fixing bolt

Claims (1)

A die plate to which an upper mold can be attached on the lower surface side, a hollow base bracket whose lower portion is fixed to the upper surface side of the die plate, and a nozzle touch whose lower end side is fixed to the upper surface side of the base bracket A ball screw mechanism screw shaft and a nut body of the ball screw mechanism screwed to the screw shaft are rotatably held, and a heating cylinder holding that is vertically movable along the screw shaft by rotation of the nut body A plate, a nozzle touch servo motor that moves the heating cylinder holding plate up and down via the nozzle touch ball screw mechanism, a heating cylinder whose base end is held by the heating cylinder holding plate, and the heating cylinder The base end of the screw that can be rotated and moved up and down is held and guided by the screw shaft of the ball screw mechanism for the nozzle touch so as to be integrated with the screw. A direct-acting plate, a servo motor for injection that is a drive source for moving the direct-acting plate up and down, and bolts around a through-hole formed in the upper surface of the base bracket. A method for adjusting the overall height of a vertical injection molding machine, comprising a mounting bracket that is bolted to an end surface of a screw shaft of a ball screw mechanism,
When transporting the vertical injection molding machine,
As the state where the linear motion plate is lowered most with respect to the heating cylinder holding plate by the injection servo motor, the heating cylinder holding plate is raised by the nozzle touch servo motor in this state,
Next, the upper part of the transport bracket for supporting the weight of the injection unit is bolted to the lower surface of the heating cylinder holding plate,
Next, the heating cylinder holding plate is lowered by the nozzle touch servomotor so that the lower part of the transfer bracket is brought into contact with the upper surface of the base bracket or the upper surface of the die plate, and then the transfer bracket Bolt the lower part to the upper surface of the base bracket or the upper surface of the die plate,
Next, after removing the bolt that connects the mounting bracket and the end surface of the screw shaft of the ball screw mechanism for nozzle touch, the screw shaft of the ball screw mechanism for nozzle touch is held in a heating cylinder by the servo motor for nozzle touch. Raised against the plate, then remove the mounting bracket,
Next, the screw shaft of the nozzle touch ball screw mechanism is lowered with respect to the heating cylinder holding plate by the nozzle touch servomotor, and a part of the screw shaft is stored in the base bracket,
A method for adjusting the overall height of a vertical injection molding machine, characterized in that the overall height of the vertical injection molding machine is reduced.

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