JP2003071889A - Ejector device for injection molding machine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an ejector device for an injection molding machine which can simply operate to couple the ejector to an ejector plate or to separate the ejector from the plate, which has a small connecting block of a back surface of a movable platen and its opening and which further does not need to additionally work the platen, a mold or the like in a special shape. SOLUTION: The ejector device 130 for the injection molding machine comprises a transfer member 133, the ejector plate 23 of the mold 20 detachably connected to the member 133 by an ejector rod 134, an ejector pin 24 reciprocated by reciprocating the member 133. In this ejector, the rod has a locking groove 134a at a base end. The transfer member has a first insertion hole 133h for allowing the rod to be inserted, and a second insertion hole 133g for allowing a locking bar 141 capable of being engaged with the locking groove of the rod. Thus, when the rod is inserted into the transfer member, the rod is fixed by the locking bar inserted into the member.

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an ejector device provided in a mold clamping device of an injection molding machine, and more particularly, to attaching and detaching an ejector plate of a mold to and from a transmission member of the ejector device. The present invention relates to an ejector device of an injection molding machine that can be freely connected. 2. Description of the Related Art FIG. 4 shows a mold clamping device 10 of a conventionally known injection molding machine. This mold clamping device has a fixed platen 11, a movable platen 12, and a support platen 13. The movable platen 12 is separated from and brought into contact with the fixed platen 11 by a mold clamping drive device 14 provided on the support platen 13, and The movable mold 21 (movable mold) of the mold 20 is replaced with the fixed mold 22.
(Fixed mold) Open and close and tighten. Numeral 15 denotes a mold clamping shaft driven by the mold clamping drive device 14, which is integrated with the hydraulic piston rod when the mold clamping drive device 14 is of a hydraulic type, and has a ball when the mold clamping drive device 14 is of an electric type. Integrated with screw or ball screw nut. 12a
Is a connection block that connects the mold clamping shaft 15 and the movable platen 12. 50 is an injection device. FIG. 5 is a sectional view showing the structure of the ejector device in detail. The ejector device 30 includes the movable mold 21
Is a device that reciprocates the ejector plate 23 and the ejector pin 24 to eject the molded product 60.
And the movable platen 12. The ejector device includes a protruding drive device 32 for reciprocatingly driving the drive rod 31 and a transmission member 3 integrally connected to the drive rod 31.
3 and an ejector rod 34 disposed between the transmission member 33 and the ejector plate 23. The illustrated driving device 32 is of a hydraulic type. When the driving device 32 is electrically driven, the driving rod 31 reciprocates by a ball screw mechanism driven by a motor (not shown). The transmission member 33 is a cross-bar-shaped block member, and has screw holes for the ejector rods 34 formed at a predetermined pitch on the protruding surface thereof. The ejector rod 34 has a predetermined length uniquely attached to the mold clamping device 10. The mold 20
The intermediate rod 25 having a length corresponding to the shape of is integrally connected to adjust the total length. Then, the ejector rod 34
Are attached to the transmission member 33 vertically or horizontally and a plurality of them are attached, or one is attached at the center thereof. Usually, the movable mold 21 incorporates a spring or the like (not shown), which pushes back the ejector plate 23 from which the ejector plate 23 projects, so that the ejector plate 23 of the movable mold 21 and the ejector rod 34 are not connected. . On the other hand, some dies do not have the spring or the like. In this case, since it is necessary to connect the ejector plate 23 and the ejector rod 34, a coupling for connecting both is incorporated. [0005] Reference numeral 70 shown in FIG. 6 or 7 denotes this type of coupling. This coupling is attached to either the transmission member 33 or the ejector plate 23, and the base end side of the ejector rod 34 (the left side in the figure)
Is connected to the transmission member 33, or the distal end side (the right side in the figure) is connected to the ejector plate 23. The coupling connects or disconnects the ejector rod 34 by a manual operation of an operator or an automatic operation pneumatically or hydraulically. This type of coupling is disclosed, for example, in JP-A-58-45937, U.S. Pat. No. 5,252,057.
And German Patent No. 3909968. Also, as a product, "QUICKKNOCK OU
T COUPLERS "(ALBA ENTERPRIS
SESINC). [0006] However, this type of conventional coupling 70 has the following problems. [0007] As a coupling for coupling the base end side of the ejector rod 34, for example, there is a coupling composed of a short rod-shaped coupling member having opposite-direction threads at both ends. This is a coupling having the simplest configuration, in which the ejector rod 34 of the mold 20 previously attached to the mold clamping device 10 and the transmission member 33 are coupled by screws at both ends thereof. However, this coupling 70
Must be inserted between the ejector rod 34 and the transmission member 33 and rotated and tightened with a tool, so that a space around the tool for turning the tool is required. Thus, in particular, the connection block 12a shown in FIG.
Is not preferable because it is necessary to provide a large opening 12b in the connection block 12a.
Because of the large opening 12b, the connection block 12
This is because the rigidity of the movable platen 12 itself decreases. [0008] Further, as the coupling 70 to be coupled on the base end side, there is a coupling 70 in which the coupling and separation are automated, as disclosed in Japanese Patent Application Laid-Open No. 58-45937. However, in order to use this type of coupling, a space occupied by the coupling must be further provided in the connection block 12a, so that the connection block 12a must be large. . On the other hand, in the coupling 70 that couples the distal end side of the ejector rod 34, it is necessary to make a hole in the mold 20 or the movable platen 12 in which the coupling 70 moves back and forth. Therefore, the movable mold 21 or the platen 21 itself needs to be additionally processed, and must be special. In addition, if the coupling 70 breaks down and cannot be separated, there is a possibility that the movable mold 21 itself must be disassembled, causing a serious trouble. The present invention has been made in view of the above circumstances, and in an ejector device for connecting a transmission member and an ejector plate, the structure thereof is simple, and even if the opening of a connection block of a movable platen is small, the connection is reliably performed. An object of the present invention is to provide an ejector device of an injection molding machine capable of performing a separating operation. An ejector device (130) of an injection molding machine according to the present invention comprises an ejector driving device (3).
2) The transmission member (133) driven by the
An ejector device of an injection molding machine that connects the ejector plate (23) of the injection molding machine (0) via an ejector rod (134) and reciprocates the transmission member (133) to reciprocate the ejector pin (24), The ejector rod (134) has a locking groove (134a) at the base end, and the transmission member (133) is connected to the ejector rod (13).
4) a first insertion hole (133h) that allows the insertion, and a second insertion hole that allows the insertion of a locking rod (141) that can be engaged with the locking groove (134a) of the ejector rod (134). (133 g) and an ejector rod (134)
When the lock rod (14) is inserted into the transmission member (133),
The ejector rod (1) is inserted by inserting the ejector rod (1).
34) is fixed to the transmission member (133). Note that the reference numerals in parentheses described above are for the sake of convenience showing elements corresponding to the drawings, and the present description does not limit the present invention to description examples on the drawings. FIG. 1 is a perspective view of a main portion of an ejector device according to the present invention. FIG. The same components as those of the conventional ejector device are denoted by the same reference numerals as those in the description of the related art, and the description thereof is omitted. The transmission member 133 includes a main body member 133a and a cover 133b attached so as to cover the front surface (projecting side surface) thereof, as will be described in more detail in FIG. The cover 133b has a plurality of first insertion holes 133h formed at a predetermined pitch along the center and the longitudinal direction thereof.
34 is inserted. The position of the insertion hole 133h is
It is adjusted to the position of the ejector rod hole 12h opened in the movable platen 12. A hole 133d having the same inner diameter is formed at the same position as the first insertion hole 133h on the surface of the main body member 133a covered by the cover 133b. The hole depth of the hole 133d is formed such that when the ejector rod 134 is inserted into the transmission member 133, a locking rod 141 described later just fits into a locking groove 134g of the ejector rod 134. The hole 133d and the first insertion hole 133h are formed to have dimensions almost similar to the outer diameter of the ejector rod 134 so that the ejector rod 134 does not rattle when inserted. So, hole 1
33d is also included in the first insertion hole 133h, and both are hereinafter referred to as a first insertion hole 133h. Furthermore, two grooves 133g are formed in the main body member 133a along the longitudinal direction thereof, into which a locking rod 141 described later is inserted. These grooves 1
33g is a main body member 133a covered by a cover 133b.
The locking rod 141 is formed so as to have a size almost similar to the outer dimension of the locking rod 141 so that no gap is generated between the locking rod 141 and the locking rod 141 when the locking rod 141 is inserted. These grooves 133
g is a second insertion hole into which the locking rod 141 is inserted, and is hereinafter referred to as a second insertion hole 133g. The ejector rod 134 has a round bar shape as a whole, and a female screw to which the intermediate rod 25 is connected is formed concentrically at the tip (right side). In the ejector rod 134, an annular groove as a locking groove 134g is formed at a predetermined position from the base end (left end), and a taper is formed near the base end. The groove width and groove depth of this annular groove are determined by the following.
It is formed in accordance with the groove width and groove depth of the locking rod 141 so that the locking rod 141 is tightly engaged with the locking rod 141 when it is inserted. The locking rod 141 is a thin rectangular bar whose side surfaces are parallel to each other, and its length is substantially equal to the length of the bar of the transmission member 133. A taper is formed at the tip of the locking rod 141 so that the locking rod 141 is inserted into the second insertion hole 13.
Easy to enter 3g. A thin piece 142 is fixed to the base end of the locking rod 141, and a knob 143 for taking out the locking rod 141 is attached. Thin plate piece 1
A small hole into which the small screw 144 is inserted is formed in 42, and the locking rod 141 is fixed to the transmission member 133 by screwing the small screw 144 into the transmission member 133. The machine screw 144 can be screwed in from its longitudinal axis direction.
For example, a head having a hexagonal head or a hexagonal hole is selected. Two locking bars 141 as described above are prepared, and the plurality of ejector rods 134 inserted in a row in the transmission member 133 vertically or horizontally are securely fixed to the transmission member 133. In the mold clamping device having the above-described ejector device 130, the mold 20 is assembled as shown in FIGS. 3 (a) to 3 (d). The mold 20 is assembled in advance outside the machine. That is, the ejector rod 134 is connected to the ejector plate 23 via the intermediate rod 25. Next, the mold 20 is moved by a suitable moving means between the opened platens 11 and 12 as shown in FIG. 3A, and is first moved to the fixed platen 11 as shown in FIG. Attached to. At this time, the locate ring 22a on the stationary mold 22 side is aligned with the locate ring hole of the stationary platen 11, and is fixed by a jig not shown. A transfer device (not shown) for guiding and supporting the mold 20 is used as needed. Next, the movable platen 12 is closed. At this time, since the center of the mold 20 is aligned with the center of the movable platen 12, the ejector rod 134 surely enters the ejector rod hole 12h of the movable mold 12. Next, as shown in FIG.
3 advances, and the base of the ejector rod 134 completely enters the first insertion hole 133h of the transmission member 133. In this state, the two locking rods 141 are inserted into the second insertion holes 133g as shown in FIG.
33, and the locking rod 141 is moved to the transmission member 133.
Fixed to. Thus, the transmission member 133 and the ejector plate 23 are connected. Transmission member 133 and ejector plate 23
Is the reverse of the above procedure. First, the operator removes the small screw 144 and pulls out the locking rod 141 from the second insertion hole 133g. Next, ejector rod 1
The mold is opened until 34 comes out of the movable platen 12, and finally the mold 20 is removed from the mold clamping device and collected. According to the ejector device of the present invention, the transmission member and the ejector plate can be connected and separated only by the operation of the operator inserting and removing the thin locking rod with respect to the transmission member. And the fastening of the small screw for fixing the locking rod is also possible from the longitudinal direction. Thus, the connection block itself of the movable platen and its opening can be small. Further, since the structure is simple, the above-mentioned connection and separation can be easily performed, and there is no possibility that the locking rod will not come off. In addition, there is no need to additionally work special holes in the movable platen, the mold, and the like.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a sectional view showing an assembled state of an ejector device of the present invention. FIGS. 2A and 2B are a perspective view and a sectional view showing a main part of the ejector device of the present invention, wherein FIG. 2A is an exploded perspective view showing the configuration thereof, and FIG. 2A is a sectional view taken along the line BB in FIG. 2A, and FIG.
2B is a sectional view taken along the line CC, and FIG. 2D is FIG.
FIG. 3 is a sectional view taken along the line DD in FIG. FIG. 3 is a partial cross-sectional side view showing a procedure in which a mold is mounted on a mold clamping device having the ejector device of the present invention;
FIG. 3A is a state diagram before assembling the mold, and FIG.
FIG. 3C is a view showing a state in which the mold is mounted on a fixed platen, FIG. 3C is a view showing a state in which the mold is closed, and FIG. 3D is a view showing a state in which the ejector rod is connected by a locking rod. FIG. 4 is a side view showing a partial cross section of a conventional mold clamping device of an injection molding machine. FIG. 5 is a more detailed sectional view of FIG. 4; FIG. 6 is a cross-sectional view showing an arrangement of a coupling of a conventional ejector device. FIG. 7 is a cross-sectional view showing an arrangement of a coupling of a conventional ejector device. DESCRIPTION OF SYMBOLS 20 Mold 23 Ejector plate 24 Ejector pin 32 Ejector drive device 130 Ejector device 133 Transmission member 133h First insertion hole 133g Second insertion hole 134 Ejector rod 134a Lock groove 141 Lock bar

Claims (1)

Claims: 1. An ejector pin is reciprocated by connecting a transmitting member driven by an ejector driving device to an ejector plate of a mold via an ejector rod, and reciprocating the transmitting member. In the ejector device of the injection molding machine, the ejector rod has a locking groove at a base end, and the transmission member has a first insertion hole allowing insertion of the ejector rod, and a locking groove of the ejector rod. A second insertion hole allowing insertion of a lock bar that can be engaged, and the lock bar is inserted when the ejector rod is inserted into the transmission member,
An ejector device for an injection molding machine, wherein the ejector rod is fixed to the transmission member.