JP2019155719A - Ejector rod and injection molding machine using the same - Google Patents

Abstract

To provide a connecting device that warns of forgetting to attach or remove an attachment rod or falling out.SOLUTION: An ejector rod 10 includes an attachment rod 12 and a base rod 11 having a fixed end 14e fixed to a mounting hole 6b that passes through an ejector plate 6 that is close to and away from a platen 2, and to the tip of which the attachment rod 12 can be connected. The base rod 11 penetrates from the second connecting part 15 to which the attachment rod 12 is connected to the fixed end 14e attached to the ejector plate 6, and has a cylindrical hole 15f that is opposed to the attachment rod 12 attached to the second connecting part 15. A sensor unit 16 is provided for the cylindrical hole 15f, and detects whether the attachment rod 12 has been attached to the second connecting part 15.SELECTED DRAWING: Figure 1

Description

  The present invention relates to an ejector rod in which an attachment rod that can be attached to and detached from a plurality of base rods in an axial direction is selectively coupled, and an injection molding machine using the ejector rod. The present invention relates to an ejector rod that can be determined and an injection molding machine using the same.

The injection molding machine includes an ejector device that pushes out a molded product that has been injection molded into a mold by an ejector rod. The arrangement position of the ejector rod is determined by the mold, and when the mold of the injection molding machine is changed to another mold, the arrangement of the ejector rod may have to be changed.

An ejector plate is disposed behind the platen that fixes the mold. The ejector plate is provided with a plurality of positions for fixing the ejector rod. The ejector rod passes through the rod insertion hole of the platen and reaches the mold. The ejector rod is divided into a base rod on the base end side and an attachment rod on the front end side in the axial direction, and the attachment rod is detachably connected to the base rod fixed to the ejector plate. The placement of the ejector rod is changed by attaching and detaching the attachment rod while leaving the base rod as it is.

An example of such an ejector device is disclosed in Patent Document 1. According to this technique, different magnets are alternately arranged in the circumferential direction between the proximal end rod and the distal end rod so as to face each other, and are attracted and connected by a magnetic force. The rod on the tip side is rotated about the axis with respect to the rod on the side, and separated by repulsion of magnetic force.

Patent Document 2 discloses a technique of inserting and connecting a plug-side rod to a socket-side rod.

JP 2010-76278 A JP 2013-256078 A

In many cases, the injection molding machine continuously molds the same molded product, and changes to completely different molded products are few. On the other hand, changes to molds with partially different molding specifications occur relatively frequently. In this case, it is not necessary to change the position of most of the ejector rods, but only a part of the ejector rods (for example, only one) needs to be changed.

The position of the ejector rod is determined according to the mold, so it can be set as it is. However, when changing to a mold with partially different specifications, the ejector rod should be in the original position due to a mistake by the line operator. Does not exist, and the reverse is likely to occur.
The attachment rod is inserted through the platen's rod insertion hole together with the base rod, and the attachment rod / base rod connection part is hidden in the platen's rod insertion hole and is accurately connected or removed. It was difficult to determine if there was. Also, the attachment rod may come off while the injection molding operation is repeated.
An object of the present invention is to provide an ejector rod capable of warning that an attachment rod is forgotten to be attached, forgotten to be removed, or unintentionally disconnected when changing the die.

In order to achieve the above object, the ejector rod of the present invention comprises:
The ejector rod includes a base rod 11 and an attachment rod 12. An ejector plate 6 that is moved toward or away from the platen 2 is provided on the back side of the platen 2. The fixed end 14 e of the base rod 11 is fixed to the mounting hole 6 b that penetrates the ejector plate 6. The base rod 11 protrudes from the ejector plate 6 toward the platen 2. An attachment rod 12 is detachably connected to the tip of the base rod 11. By moving the ejector plate 6 toward the platen 2 in the proximity direction, the molded product in the mold M fixed to the surface of the platen 2 is pushed out through the rod insertion hole 5 of the platen 2. The base rod 11 has cylindrical holes 14c and 15f. The cylindrical holes 14c and 15f are penetrated from the tip of the base rod 11 to the fixed end 14e attached to the ejector plate 6, and the inside of the base rod (11) with respect to the attachment rod attached to the tip. Opposite. A sensor unit 16 that detects that the attachment rod 12 is connected to the distal end portion or is released is attached to the cylindrical holes 14c and 15f.

According to the present invention, when changing to a mold with partially different specifications, the ejector rod does not exist in the original position due to a mistake by the line operator, and even if the reverse case occurs, the sensor unit This can be detected. In addition, since the connection state and the connection release state of the attachment rod are detected by the sensor unit provided inside the base rod, the connection portion between the attachment rod and the base rod is hidden in the rod insertion hole. The presence or absence of accurate connection or disconnection can be detected by the sensor unit.

It is a figure which shows a part of injection molding machine, FIG. 1A is the partial cross section side view of the said part, FIG. 1B is a front view of a platen. 2A is a cross-sectional view of the base rod in which the socket and the extension rod are separated, FIG. 2B is an exploded view of the base rod in FIG. 2A, and FIG. 2C is a cross-section of the base rod in which the socket and the extension rod are integrated. Figures 2D are exploded views of the base rod of Figure 2A. It is sectional drawing which showed the connection relationship with an ejector plate, a base rod, and an attachment rod, FIG. 3A is a figure which shows before connection of an attachment rod, FIG. 3A is a figure which shows the middle of connection, FIG. 3C is a figure which shows after connection It is. It is a figure which shows an injection molding machine. It is a figure which shows an ejector apparatus, FIG. 5A is a block diagram, FIG. 5B is a figure which shows an operation | movement flow.

Examples of the present invention will be described below.
A part of the injection molding machine 1 is shown in FIG. In FIG. 1A, an injection molding machine 1 guides and supports a platen 2 to which a mold M (shown by a broken line) is fixed and a drive mechanism (not shown) so that the platen 2 can move forward and backward (in the horizontal direction in the drawing). A guide rod 3 and an ejector device 4 for ejecting a molded product from the mold M are provided. The platen 2 is provided with a plurality of rod insertion holes 5 penetrating in the left-right direction, and the arrangement positions of the rod insertion holes 5 are discrete on the surface of the platen 2 as shown in FIG. 1B. The position is set based on a plurality of types of molds M scheduled to be used in the injection molding machine 1. The ejector rod 10 is slidably inserted into the plurality of rod insertion holes 5. An ejector plate 6 is disposed on the back side (left side of the drawing) of the platen 2, and an ejector rod 10 is provided on the ejector plate 6 so as to protrude rightward. The ejector plate 6 is moved toward and away from the platen 2 by an ejector drive mechanism 7. The ejector rod 10 includes a base rod 11 fixed to the ejector plate 6 and an attachment rod 12 that is selectively connected to the base rod 11. Here, “selective” means that depending on the set mold M, there is a portion where the attachment rod 12 is not connected to the base rod 11 and a portion where the attachment rod 12 is not connected. The attachment rod 12 is provided with a first connecting portion 13 for connecting to the base rod. The first connecting portion 13 will be described later with reference to FIG. In the present specification, the term “ejector rod 10” refers to both the case where only the base rod 11 is used and the case where the attachment rod 12 and the base rod 11 are connected.

When the ejector drive mechanism 7 on the back surface of the platen 2 moves the ejector plate 6 to the left and right with respect to the platen 2, the ejector rod 10 is also slid in the corresponding rod insertion hole 5. When the ejector rod 10 moves to the right (in the eject position), the tip of the base rod 11 does not protrude right from the platen 2. On the other hand, the ejector rod 10 to which the attachment rod 12 is attached enters the mold M attached to the platen 2 and pushes out the internal molded product by the pushing force of the ejector drive mechanism 7.

FIG. 2 is a cross-sectional view of the base rod 11. The base rod 11 includes a cylindrical extension rod 14 and a columnar second connecting portion 15 having the same outer diameter as the extension rod 14. The female screw 14a at the right end of the extension rod 14 and the male screw 15e at the left end of the second connecting portion 15 are coaxial, and are fixed and integrated by screwing them together. The relationship between the female screw 14a and the male screw 15e may be reversed.

A socket hole 15a is opened in the second connecting portion 15 from the right end surface (tip surface) to the left. A lock groove 15b that is recessed outward in the radial direction is formed in the circumferential direction at the right end portion (tip end portion) of the inner peripheral wall of the socket hole 15a. On the left and right sides of the lock groove 15b, there are provided receiving surfaces 15c to which the outer periphery of the first connecting portion 13 (described later) is fitted. Further, a fitting portion 15d made of a hexagonal hole is provided on the left side (back side) of the socket hole 15a. The fitting portion 15d is used for rotating and tightening a hexagon wrench when the second connecting portion 15 is screwed to the extension rod 14. On the further left side (back side) of the fitting portion 15 d, a cylindrical hole 15 f (mounting hole) concentric with the second connection portion 15 penetrates to the left end of the second connection portion 15. A female screw 15g is provided on the inner peripheral wall of the cylindrical hole 15f. The sensor unit 16 has a male screw 16a screwed to the female screw 15g on the outer periphery, and a rod sensor 16b is disposed inside. The sensor unit 16 can be screwed in from the left side of the female screw 15g of the second connecting portion 15, and the root thereof is provided with an input surface 16c such as a two-sided flat surface or a hexagonal surface by means of a suitable tool. It can receive rotational force. The rod sensor 16b is a sensor that detects the presence / absence of the first connecting portion 13, and a contact such as a switch or a non-contact sensor such as a Hall element, a photoelectric sensor, or a proximity switch can be used. The sensor unit 16 is screwed into the female screw 15g until it reaches an optimum position for detecting the presence / absence of the first connecting portion 13, and the lock nut 17 is screwed into the male screw 16a from the left side at an appropriate position. To fix. By adjusting the position of the rod sensor 16b, the rod sensor 16b can react with high accuracy even when the first connecting portion 13 is slightly detached.

The extension rod 14 has a female screw 14 a into which the male screw 15 e of the second connecting portion 15 is screwed, a storage chamber 14 b that houses a part of the sensor unit 16, and a cylindrical hole 14 c that is concentric with the extension rod 14. Are formed sequentially from the right side and penetrate to the left end of the extension rod 14. The socket hole 15a of the 2nd connection part 15 is connected to the cylinder hole which let the cylinder hole 14c and the cylinder hole 15f pass. With this configuration, when the attachment rod 12 is inserted into the socket hole 15a, the first connecting portion 13 of the attachment rod 12 faces the cylindrical hole.

FIG. 3 is a cross-sectional view showing the connection between the ejector plate 6, the base rod 11, and the attachment rod 12. The plate 8 in contact with the platen 2 is a magnet clamp plate that fixes the mold M to the platen by magnetic force. 3A, the base rod 11 is fixed to the ejector plate 6 in a state where the extension rod 14 and the second connecting portion 15 are fixed and integrated. The male screw provided on the outer periphery of the fixed end 14e is fixed by being screwed into the female screw 6a provided on the inner periphery of the mounting hole 6b of the ejector plate 6. At the time of fixing, the extension rod 14 is rotated by an appropriate jig with respect to an input surface 14d such as a flat two-plane or hexagonal surface provided on a part of the outer periphery of the extension rod 14. The attachment hole 6 b is a through hole that penetrates the ejector plate 6. For this reason, wiring such as a signal line from the sensor unit 16 is taken out to the back side of the ejector plate 6 through the cylindrical hole 14 c and the mounting hole 6 b of the extension rod 14. A sensor unit 16 is provided in the cylindrical hole 15 f of the base rod 11. Thereby, even if the connection part of the attachment rod 12 and the base rod 11 is hidden in the rod insertion hole 5, it can detect by the sensor unit 16 that it is connected reliably or has come off. . Further, the wiring from the sensor unit 16 is not routed between the platen 2 and the ejector plate 6 that are moved close to and away from each other.

Moreover, the cross section of the attachment rod 12 is shown by the right side of FIG. 3A. The attachment rod 12 includes a columnar extension rod 18 and a first connection portion 13 having the same diameter as the extension rod 18 and a hollow base end portion 13a on the right side. A female screw 13b provided on the inner periphery of the base end portion 13a is fixed to the male screw 18a of the extension rod 18 with screws. The relationship between the female screw 13b and the male screw 18a may be reversed, as shown in Patent Document 2.

The 1st connection part 13 has the insertion cylinder 13c smaller diameter than the base end part 13a on the left side of the base end part 13a. An elastic member 13f made of a compression coil spring is mounted in the tube hole 13d of the insertion tube 13c so as to urge the operation member 13e to the left. The elastic member 13 f is supported by a pressing surface 18 b provided on the left side of the male screw 18 a of the extension rod 18. Two receiving holes 13g penetrating in the radial direction are provided in the inner peripheral wall of the cylindrical hole 13d at a predetermined interval in the circumferential direction. A locking ball 13h is inserted into each housing hole 13g so as to be movable in the radial direction. The accommodation hole 13g penetrates the cylindrical wall 13i of the insertion cylinder 13c. The cylinder wall 13i of the insertion cylinder 13c and the receiving surface 15c of the second connecting portion 15 have substantially the same diameter to such an extent that they have a gap necessary for both to slide. The accommodation hole 13g is provided with a reduced diameter portion that decreases in diameter toward the outside, thereby preventing the ball 13h from dropping out. The left end portion of the operation member 13e is formed to taper toward the left, and the ball 13h is always urged radially outward by the elastic member 13f. An appropriate shape or material is selected for the first connecting portion 13 depending on the type of rod sensor 16b to be set.

3B and 3C show a process of attaching the first connecting portion 13. In FIG. 3B, when the first connecting portion 13 is inserted into the second connecting portion 15, the tube wall 13 i of the insertion tube 13 c of the first connecting portion 13 slides on the receiving surface 15 c of the second connecting portion 15. The ball 13h is in a state of being pushed into the first connecting portion 13 by the receiving surface 15c of the second connecting portion 15. In FIG. 3C, when the first connecting portion 13 reaches the stop position, the ball 13h enters and is held in the lock groove 15b. The tip of the first connecting portion 13 approaches or contacts the rod sensor 16b (depending on the sensor type), and the rod sensor 16b outputs detection information of the first connecting portion 13 to the back side of the ejector plate 6 via the mounting hole 6b. .

2C and 2D show another embodiment of the ejector rod 10. Unlike the base rod 11, the base rod 21 is not fixed and integrated by screwing separate members including the extension rod 14 and the second connecting portion 15, and the extension rod portion 22 and the base rod 21 are combined into a single cylinder. The end side joint portion 23 and the one member are processed and formed. The sensor unit 24 of the base rod 21 includes a contact 24a and a rod sensor (for example, a pressure sensor) 24b. Unlike the base rod 11, the rod sensor 24b is not provided in the base rod 21, but only the contactor 24a.

The base end side joint portion 23 of the base rod 21 has a socket hole 21a opened from the right end surface (tip surface) to the left. A lock groove 21b is formed in which the right end portion (tip end portion) of the inner peripheral wall of the socket hole 21a is recessed outward. On the left and right sides of the lock groove 21b, there are provided receiving surfaces 21c on which the cylindrical wall 13i of the first connecting portion 13 is fitted. Further, a fitting portion 21d made of a hexagonal hole is provided on the left side (back side) of the socket hole 21a. When the base rod 21 is screwed to the ejector plate 6, the fitting portion 21 d is used for mounting and tightening a hexagon wrench. On the further left side (back side) of the fitting portion 21 d, a cylindrical hole 21 e concentric with the base rod 21 penetrates to the left end of the base rod 21. A contact 24a of the sensor unit 24 is inserted into the cylindrical hole 21e, and the contact 24a is connected to a rod sensor 24b fixed to the left side of the ejector plate 6.

Next, the ejector device 4 that can determine whether the attachment rod 12 necessary for the base rod 11 is connected using the ejector rod 10 will be described.
First, an example in which a function for determining whether the attachment rod 12 necessary for the base rod 11 is connected to an existing injection molding machine is simply shown. FIG. 4 shows the injection molding machine 1. In this example, even if the mold M is changed, the present invention can be applied to a case where only a limited ejector rod 10 is changed.

In a production plan in which the mold M set in the injection molding machine 1 forms a molded product having slightly different specifications, the manager of the production facility can only detect the location where the presence / absence of the ejector rod 10 changes. The unit 16 (or 24, hereinafter the same) is replaced with the provided base rod 11, and the output of the rod sensor 16b (or 24b, hereinafter the same) is connected to the alarm display device 9 (for example, a lamp). The alarm display device 9 displays a warning when the rod sensor 16b cannot detect the attachment rod 12. Further, the presence or absence of operation of the alarm display device 9 for each mold M is displayed on the outer surface of the mold M. Thereafter, an operator in charge of the injection molding machine 1 operates the injection molding machine 1 to perform work. If an incorrect attachment rod 12 is set at that time, the rod sensor 16b of the base rod 11 which should be originally set is not detected, and the alarm display device 9 operates. The operator can confirm that the proper setting is not made by viewing the display on the outer surface of the mold M. Even if it is assumed that the attachment rod 12 has been set correctly, if the rod sensor 16b cannot be detected, a warning is issued because the rod is actually disconnected. Then, the connection between the attachment rod 12 and the base rod 11 becomes unstable during the work, and a warning is displayed if the rod sensor 16b cannot detect the attachment rod 12 even if the attachment rod 12 is detached or about to be detached. An abnormality in the molding machine 1 can be noticed.

Next, the ejector device 4 to which a function for determining whether the attachment rod 12 necessary for the base rod 11 is connected when the injection molding machine is significantly changed from the existing injection molding machine or the injection molding machine is newly installed is illustrated. As shown in FIG. The ejector device 4 includes a memory 25, an input device 26, a processing device 27, an alarm device 28, and a bar code reader 29. Moreover, ID which specifies a metal mold | die is attached | subjected to the metal mold | die.

The base rod 11 provided with the sensor unit 16 is set in all the mounting holes 6 b of the ejector plate 6. An address is assigned to each base rod 11 corresponding to the position of the mounting hole 6b. Further, the memory 25 stores connection information 25a indicating which address of the base rod 11 should be connected to the attachment rod 12 for each mold M.

The operator connects each attachment rod 12 to a predetermined base rod 11 and inputs the ID of the mold M through the input device 26. When the mold ID is assigned to the mold M as a barcode, the barcode information is read by the barcode reader 29. The processing device 27 executes the flow shown in FIG. 5B. Based on the ID of the mold M, the connection information 25a is read from the memory 25 (step 30). The rod detection result from each sensor unit 16 is compared with the connection information 25a (step 31). If they do not match, the processing device 27 transmits the mismatch information to the alarm device 28, and the alarm device 28 issues an alarm. Further, as long as the mold M is set to the platen 2, the processing device 27 detects the attachment rod 12 and detects the attachment rod 12 during the work, so that the alarm device is similarly used. 28 issues an alarm (step 32).

According to this embodiment, even if it is not an administrator of the production facility, it can be determined whether or not the proper attachment rod 12 is connected only by inputting the ID of the mold. There is an effect that it can be handled.

In the above embodiment, the second connecting portion 15 of the base rod 11 is a female socket, and the first connecting portion 13 of the attachment rod 12 is a male plug. It doesn't matter. For example, as shown in Patent Document 1, an ejector rod provided with a convex engagement pin on the base rod side fixed directly to the ejector plate and provided with an engagement hole into which the engagement pin is inserted on the removable rod side It is also applicable to. In this case, the sensor unit is set by providing a cylindrical hole penetrating from the ejector plate side to the tip of the engagement pin of the base rod. And the rod sensor of a sensor unit detects the bottom face of an engagement hole.

DESCRIPTION OF SYMBOLS 1 Injection molding machine 2 Platen 3 Guide rod 4 Ejector apparatus 5 Rod insertion hole 6 Ejector plate 6a Female screw 6b Mounting hole 7 Ejector drive mechanism 8 Plate 9 Alarm display apparatus 10 Ejector rod 11 Base rod 12 Attachment rod 13 1st connection part 13a Base end portion 13b Female screw 13c Insertion tube 13d Tube hole 13e Operation member 13f Elastic member 13g Housing hole 13h Ball 13i Tube wall 14 Extension rod 14a Female screw 14b Housing chamber 14c Tube hole 14d Input surface 14e Fixed end 15 Second connecting portion 15a Socket hole 15b Lock groove 15c Receiving surface 15d Fitting portion 15e Male screw 15f Tube hole 15g Female screw 16 Sensor unit 16a Male screw 16b Rod sensor 16c Input surface 17 Lock nut 18 Extension rod 18a Screw 18b Pushing surface 21 Base rod 21a Socket hole 21b Locking groove 21c Receiving surface 21d Fitting part 21e Tube hole 22 Extension rod part 23 Base end side joint part 24 Sensor unit 24a Contact 24b Rod sensor 25 Memory 25a Connection information 26 Input device 27 Processing device 28 Alarm device 29 Bar code reader

Claims (5)

The fixed end (14e) is fixed to the mounting hole (6b) that penetrates the ejector plate (6) provided on the back side of the platen (2) so that the platen (2) is moved in the proximity direction or the separation direction. A base rod (11) projecting from the ejector plate (6) toward the platen (2);
An ejector rod comprising an attachment rod (12) removably coupled to a tip of the base rod (11),
By moving the ejector plate (6) toward the platen (2) in the proximity direction, the molded product in the mold (M) fixed to the surface of the platen (2) is transferred to the platen (2). In the ejector rod (10) extruded through the rod insertion hole (5) of
The base rod (11) penetrates from the tip of the base rod (11) to a fixed end (14e) attached to the ejector plate (6), and is attached to the attachment rod attached to the tip. It has cylindrical holes (14c, 15f) facing inside the base rod (11),
A sensor unit (16) for detecting that the attachment rod (12) is connected to the distal end portion or disconnected is attached to the cylindrical hole (14c, 15f).
Ejector rod characterized by that.

In the ejector rod of Claim 1,
The base rod (11) has an extension rod (14) attached to the ejector plate (6) and a second connecting part (15) to which an attachment rod (12) is attached,
A female screw (15g) is provided in the cylindrical hole (15f) penetrating the second connecting portion (15), and a male screw (16a) is screwed onto the outer periphery of the sensor unit (16) with the female screw (15g). )
An ejector rod, wherein the sensor unit (16) advances and retreats in the cylindrical hole (15f) by screwing the female screw (15g) and a male screw (16a).
An ejector plate (6) to which the ejector rod according to claim 1 or 2 is attached;
An injection molding machine comprising an alarm display device (9) for displaying a detection signal of the sensor unit (16).
An ejector plate (6) to which a plurality of ejector rods according to claim 1 or 2 are attached;
A memory (25) for storing connection information indicating the attachment rod (12) to be connected to the base rod (11) attached to which position of the ejector plate (6) according to the mold (M);
A processing device (27) that reads the corresponding connection information (25a) from the identification information of the mold (M) attached to the platen (2) and compares it with the detection signal from the sensor unit (16) of each ejector rod. When,
An injection molding machine comprising an alarm device (28) that issues an alarm when they do not match.
A base rod protruding from the ejector plate (6) provided on the back side of the platen (2) so as to be moved in the proximity direction or the separation direction with respect to the platen (2) 11) and
An ejector rod comprising an attachment rod (12) removably coupled to the tip of the base rod (11),
By moving the ejector plate (6) toward the platen (2) in the proximity direction, the molded product in the mold (M) fixed to the surface of the platen (2) is transferred to the platen (2). In the ejector rod (10) extruded through the rod insertion hole (5) of
A sensor unit (16) for detecting that the proximal end of the attachment rod (12) is connected to the distal end of the base rod (11) or that the connection is released is attached to the base rod (11). Be
Ejector rod characterized by that.