JP5395494B2 - Ejecting device for molding machine - Google Patents

Description

  The present invention relates to an ejecting device provided in a molding machine such as an injection molding machine or a die casting machine, and particularly relates to a structure for mounting on a movable die plate.

  2. Description of the Related Art Conventionally, as an ejecting device provided in a die casting machine, a device that converts the rotation of an ejecting electric servo motor into a linear reciprocating motion of an ejecting pin using a ball screw mechanism is known (for example, see Patent Document 1).

  FIG. 5 to FIG. 8 show an example of this type of electric ejecting apparatus which has been conventionally implemented by the applicant of the present application. As shown in these drawings, the electric ejecting apparatus of this example includes an electric servomotor 1 for ejecting, a pulley 2 driven to rotate by the motor 1, a screw shaft 3 connected to the pulley 2, A nut body 5 screwed to the screw shaft 3 and linearly reciprocating in a direction approaching or moving away from the movable die plate 4 as the screw shaft 3 rotates, and attached to the nut body 5 The extrusion plate 6 is composed mainly of a guide bar 7 that guides the extrusion plate 6 along the screw shaft 3, and an eject pin 8 attached to the extrusion plate 6. Reference numeral 9 in the figure denotes a toggle mounting portion formed on the movable die plate 4, and the movable die plate 4 is connected to the toggle mounting portion 9 via a toggle link mechanism (not shown). It is linearly reciprocated in a direction approaching or separating from the plate.

  The pulley 2 is rotatably housed in a pulley case 11 via a bearing 10, and the ejecting electric servo motor 1 is attached to the tip of a motor mounting plate 12 projecting outward from the outer surface of the pulley case 11. Fastened using bolts 13. The pulley 1 a provided on the motor shaft of the ejecting electric servomotor 1 and the pulley 2 housed in the pulley case 11 are connected via a timing belt 14. A belt cover 15 that covers the timing belt 14 is attached to the motor attachment plate 12. Thus, if the pulley 1a and the pulley 2 are connected via the timing belt 14, no slip occurs between the pulley 1a and the timing belt 14 and between the pulley 2 and the timing belt 14. The protruding position can be controlled with high accuracy.

  As shown in FIGS. 6 and 7, a mounting flange 16 is integrally formed at the open end of the pulley case 11, and the pulley case 11 is movable via the mounting flange 16 and the guide rail 7. It is attached to the end face of the die plate 4. That is, a concave portion 17 into which one end portion of the guide rail 7 can be fitted is formed on the end surface of the mounting flange 16 on the movable die plate 4 side, and the other end surface of the mounting flange 16 is formed on the bottom surface of the concave portion 17. Bolt through-holes 18 penetrating up to are established. On the other hand, a concave portion 19 into which the other end portion of the guide rail 7 can be fitted is formed at a position corresponding to the concave portion 17 of the movable die plate 4, and a screw hole 20 is formed in the bottom surface of the concave portion 19. Further, the guide rail 7 is formed in a cylindrical shape, and a bolt through hole 21 penetrating from one end face to another end face is opened. Then, one end of the guide rail 7 is fitted into a recess 19 formed in the movable die plate 4, and the other end of the guide rail 7 is fitted into a recess 17 formed in the mounting flange 16. A bolt through hole 18 provided in the flange 16 and a bolt 22 inserted into the bolt through hole 21 provided in the guide rail 7 are screwed into a screw hole 20 formed in the bottom surface of the recess 19, whereby a pulley The case 11 can be fixed.

  The extrusion plate 6 is provided with a through hole for the guide rail 7, and a sliding bearing 23 is provided in the through hole as shown in FIG. As shown in FIG. 5, the eject pin 8 is fastened to the extrusion plate 6 using a nut 24. The distal end portion is slidably inserted into an eject pin insertion hole 25 provided in the movable die plate 4.

  The conventional electric ejecting apparatus configured as described above moves linearly in a direction in which the nut body 5 approaches the movable die plate 4 as the screw shaft 3 rotates when the electric servomotor 1 for ejecting is rotated forward. Then, the tip of the eject pin 8 protrudes toward the movable die mounting surface side of the movable die plate 4 and the molded product is taken out from the movable die. When the electric servomotor 1 for ejecting is reversed from this state, the nut body 5 moves linearly in the direction away from the movable die plate 4 as the screw shaft 3 is driven to rotate, and the tip of the eject pin 8 is taken out of the molded product. Retreat from position.

JP 2006-315072 A

  As described above, the conventional ejecting device is provided with the mounting flange 16 in the pulley case 11, and fits one end portion of the guide rail 7 in the recess 17 formed in the mounting flange 16, and is opened in the mounting flange 16. The movable die plate is formed by screwing a bolt 22 inserted into the bolt through hole 21 and the bolt through hole 21 provided in the guide rail 7 into a screw hole 20 formed in the bottom surface of the concave portion 19 of the movable die plate 4. Since the pulley case 11 is attached to 4, the long guide rail 7 and the bolt 22 are required, and there is a problem that the apparatus is increased in size, weight, and cost. Since the attachment flange 16 is provided in the pulley case 11, the work space for attaching and removing the eject pin 8 to and from the extrusion plate 6 is limited, and there is a problem that the maintainability is poor.

  The present invention has been made in view of the actual situation of the prior art, and an object of the present invention is to provide an ejector for a molding machine that is small, light, low cost, and has good maintainability.

  In order to solve the above problems, the present invention firstly, a pulley that is rotationally driven by an electric servomotor for ejection, a screw shaft that is coupled to the pulley, and a screw shaft that is screwed to the screw shaft. A nut body that linearly reciprocates in a direction approaching or moving away from the movable die plate with rotation, an extrusion plate attached to the nut body, and guiding the extrusion plate along the screw shaft In an ejecting apparatus for a molding machine, comprising: a guide rail for rotating, an eject pin attached to the extrusion plate, and a toggle mounting portion formed on the movable die plate; and a pulley case for rotatably holding the pulley. Attaching the guide rail to the mounting part and using the bolt inserted from the mounting surface side of the movable mold Was the configuration that is fastened to the movable die plate.

  According to this configuration, since the pulley case is attached to the toggle attachment portion of the movable die plate, it is not necessary to fit the pulley case and the guide rail, and the guide rail can be shortened. In addition, since the guide rail is fastened to the movable die plate using the bolt inserted from the mounting surface side of the movable mold, the bolt of the bolt is compared with the case where the pulley case, the guide rail and the movable die plate are fastened together. It can be shortened. Furthermore, since it is not necessary to form a mounting flange on the opening end side of the pulley case, the work space for mounting and removing the eject pin on the extrusion plate can be expanded.

  Secondly, according to the present invention, in the first ejecting apparatus, a boss for connecting to the toggle mounting portion is integrally formed on the outer surface of the pulley case.

  According to such a configuration, since the required boss is integrally formed on the outer surface of the pulley case, the cost can be reduced by reducing the number of parts and the number of assembly steps.

  In the ejecting apparatus of the molding machine according to the present invention, the pulley case is attached to the toggle mounting portion, and the guide rail is fastened to the movable die plate using the bolt inserted from the mounting surface side of the movable mold. In addition to being shortened, the bolts for fastening the guide rail to the movable die plate can be shortened, and can be manufactured in a small size, light weight and low cost. Moreover, since it is not necessary to form a mounting flange on the opening end side of the pulley case, the work space for mounting and removing the eject pin on the extrusion plate can be expanded, and the maintainability of the apparatus can be improved.

It is the side view which carried out partial cross section of the ejector concerning an embodiment. It is a front view of the state which removed the belt cover of the ejector which concerns on embodiment. It is the top view which carried out partial cross section of the ejector concerning an embodiment. It is a rear view of the eject apparatus which concerns on embodiment. It is the side view which carried out the partial cross section of the eject apparatus which concerns on a prior art example. It is a front view of the state which removed the belt cover of the ejector which concerns on a prior art example. It is the top view which carried out the partial cross section of the ejector which concerns on a prior art example. It is a rear view of the eject apparatus which concerns on a prior art example.

  Hereinafter, an embodiment of an ejecting apparatus according to the present invention will be described with reference to FIGS. The ejecting apparatus of this example is also basically the same as the ejecting apparatus according to the conventional example shown in FIGS. 5 to 8, and an electric servomotor 1 for ejecting, a pulley 2 driven to rotate by the motor 1, The screw shaft 3 connected to the pulley 2 is screwed to the screw shaft 3 and linearly reciprocates in a direction approaching or moving away from the movable die plate 4 as the screw shaft 3 rotates. A moving nut body 5, an extrusion plate 6 attached to the nut body 5, a guide rail 7 for guiding the extrusion plate 6 along the screw shaft 3, and an eject pin 8 attached to the extrusion plate 6. The movable die plate 4 has a toggle mounting portion 9 formed integrally therewith. The pulley 2 is rotatably housed in a pulley case 11 via a bearing 10, and the ejecting electric servo motor 1 is attached to the tip of a motor mounting plate 12 projecting outward from the outer surface of the pulley case 11. Fastened using bolts 13.

  As shown in FIGS. 1 and 2, a boss 31 is integrally formed on the outer surface of the pulley case 11 to be connected to the toggle mounting portion 9. The length of the boss 31 is set so as to abut against the inner surface of the toggle mounting portion 9, and a screw hole 32 is formed on the outer surface thereof. On the other hand, a bolt through hole 33 is opened at a position corresponding to this of the toggle mounting portion 9. The pulley case 11 is fastened to the toggle mounting portion 9 by fitting the screw hole 32 and the bolt through hole 33 and then screwing the bolt 34 inserted into the bolt through hole 33 into the screw hole 32. Thus, when the boss 31 for connecting the pulley case 11 to the toggle mounting portion 9 is integrally formed on the outer surface of the pulley case 11, a special member for connecting the pulley case 11 and the toggle mounting portion 9 is provided. Since this is not necessary, the cost can be reduced by reducing the number of parts and the number of assembly steps. In addition, the attachment flange is not provided in the edge part by the side of the opening of the pulley case 11, This part is formed in the simple cylindrical shape.

  The guide rail 7 is formed in a columnar shape, and a screw hole 37 is formed in a central portion on one end side thereof. On the other hand, the guide rail setting portion of the movable die plate 4 is formed with a concave portion 19 into which one end portion of the guide rail 7 can be fitted, and a bolt through hole 35 is formed in the bottom center portion of the concave portion 19. . The guide rail 7 was inserted into the bolt through hole 35 from the movable die mounting surface side of the movable die plate 4 after one end portion was fitted into a recess 19 formed in the guide rail setting portion of the movable die plate 4. The bolt 36 is fastened to the movable die plate 4 by being screwed into a screw hole 37 formed at one end of the guide rail 7.

  The other parts are the same as those of the ejecting apparatus of the molding machine according to the conventional example shown in FIGS.

  As described above, the ejecting apparatus of the molding machine according to the embodiment attaches the pulley case 11 to the toggle attaching portion 9 formed integrally with the movable die plate 4, and thus fits the pulley case 11 and the guide rail 7 together. There is no need, and the guide rail 7 can be shortened. Further, since the guide rail 7 is fastened to the movable die plate 4 using the bolts 36 inserted from the mounting surface side of the movable mold, the pulley case 11, the guide rail 7, and the movable die plate 4 are fastened together. Compared to the above, the bolt can be shortened. Therefore, the ejecting apparatus can be reduced in size, weight, and cost. Furthermore, since the ejecting apparatus of the molding machine according to the embodiment does not need to form a mounting flange on the opening end side of the pulley case 11, the working space for mounting and removing the eject pin 8 on the extrusion plate 6 is expanded. And maintainability can be improved.

  The present invention can be used to take out a molded product from a molding machine such as an injection molding machine or a die casting machine.

1 Electric Servo Motor for Ejection 2 Pulley 3 Screw Shaft 4 Movable Die Plate 5 Nut Body 6 Extrusion Plate 7 Guide Rail 8 Eject Pin 9 Toggle Mounting Portion 10 Bearing 11 Pulley Case 12 Motor Mounting Plate 13 Bolt 14 Timing Belt 15 Belt Cover 31 Boss 32 Screw hole 33 Bolt through hole 34 Bolt

Claims (2)

A pulley driven to rotate by an electric servomotor for ejection, a screw shaft connected to the pulley, a direction screwed into the screw shaft and approaching the movable die plate as the screw shaft rotates, or a movable die plate A nut body that linearly reciprocates in a direction away from the extrusion body, an extrusion plate attached to the nut body, a guide rail that guides the extrusion plate along the screw shaft, and an eject pin attached to the extrusion plate, In an ejecting apparatus of a molding machine comprising a toggle mounting portion formed on the movable die plate,
A pulley case for rotatably holding the pulley is attached to the toggle mounting portion, and the guide rail is fastened to the movable die plate using a bolt inserted from the mounting surface side of the movable mold. Ejecting device for molding machine.   2. The ejecting apparatus for a molding machine according to claim 1, wherein a boss for connecting to the toggle mounting portion is integrally formed on an outer surface of the pulley case.

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