JP4921545B2 - Mold fixing system - Google Patents

Description

  The present invention relates to a mold fixing system for a plurality of injection molding machines each having a pair of platens, and more particularly to a configuration in which a set of operation control units can be shared by a plurality of injection molding machines.

  Conventionally, in an injection molding machine, a mold (a fixed mold and a movable mold) is fixed to a platen such as a stationary platen or a movable platen, and the movable side platen is moved toward and away from the fixed side platen. Then, mold clamping and mold opening are performed. With the molds clamped, molten synthetic resin is injected into the cavities inside these molds to mold the molded product, then the mold is opened, and the molded product is ejected by the ejector mechanism. The

  Here, in many cases, the mold is fixed to the platen of the injection molding machine using a plurality of bolts or a hydraulic clamp device. However, in recent years, a magnetic force that attracts and fixes the mold to the platen by a magnetic force is used. Type fixing devices are being put into practical use.

  In the injection molding machine of Patent Document 1, a clamp plate incorporating a plurality of magnet units (magnetic force generation mechanisms) is fixed to a stationary platen and a movable platen, and the mold is clamped by the magnetic force generated by the plurality of magnet units. It is comprised so that it may fix to the fixed surface. Each magnet unit described above surrounds the outer periphery of the steel block, a plurality of permanent magnets arranged on the outer peripheral side of the steel block, an alnico magnet provided on the back side of the steel block, and the alnico magnet. The direction (polarity) of the magnetic field of the alnico magnet can be switched by energizing the coil.

  When fixing the mold to the fixed surface of the clamp plate, by operating the operation panel, power is supplied from the control unit to each magnet unit, and each coil is energized in a predetermined direction for several seconds, The plurality of permanent magnets form a magnetic circuit in which the mold becomes a part of the magnetic path, and the plurality of magnet units are switched to an attracting state in which the mold is attracted.

On the other hand, when releasing the mold, energize for several seconds in the opposite direction to the case where the mold is attracted to the coil, and switch the polarity of the alnico magnet in the opposite direction to make the mold a magnetic path. A magnetic circuit that is not part of the magnetic circuit is formed, and a plurality of magnet units are switched to a non-adsorption state in which the mold is not adsorbed.
JP 2005-169840 A

  By the way, each injection molding machine is provided with an operation panel for attaching and detaching a mold and a control unit for operating and controlling a plurality of magnet units mounted on a pair of clamp plates on the fixed side and the fixed side. Yes. These operation panel and control unit are used only when power is supplied to each magnet unit of the injection molding machine for several seconds when the mold is replaced, and is not used at other times. Therefore, if each injection molding machine is provided with an operation panel and a control unit for attaching and detaching molds, the equipment cost for fixing the mold becomes expensive, and the equipment cost in a molding factory having a plurality of injection molding machines is increased. It becomes expensive.

  An object of the present invention is a mold fixing system including a plurality of magnetic force generating mechanisms for fixing a mold, which are respectively mounted on a plurality of injection molding machines, and a set of operation panel and control unit for attaching and detaching a mold Is to provide a mold fixing system which can be shared by a plurality of injection molding machines.

The mold fixing system according to the present invention is a mold fixing system for a plurality of injection molding machines each having a pair of platens, and is mounted on each of the plurality of injection molding machines and fixed to the platen or the platen. A plurality of magnetic force generating mechanisms for generating a magnetic force for fixing the mold to the mold mounting plate, and a plurality of injection molding machines, each of which is equipped with a magnetic force generating mechanism of the injection molding machine, a control unit, and a power supply device . there a plurality of common connectors and, a set of portable operation control unit which is selectively connected to a plurality of injection molding machines having an electrically connected identical structure, connectable to said common connector through the connector is characterized in that a any one of the injection molding machine of the magnetic force generation mechanism and control unit and the power supply and electrically connectable to a set of operation control unit.

  According to the mold fixing system of the present invention, a common connector is provided in each of a plurality of injection molding machines, and a set of operation control units is connected to a common connector of any one injection molding machine for exchanging molds. Since the magnetic force generating mechanism of the injection molding machine, the control unit, and the power supply device are configured to be connectable, a single set of operation control units can be shared by a plurality of injection molding machines. Therefore, it is not necessary to provide an operation panel and a control unit for attaching / detaching the mold to each injection molding machine, and the equipment cost can be reduced in a molding factory having a plurality of injection molding machines.

In addition to the above-described configuration of the present invention, the following various configurations may be employed.
(1) A plurality of interfaces that are respectively provided in a plurality of injection molding machines and that are electrically connected to the magnetic force generation mechanism, the control unit, and the power supply device of the injection molding machine and electrically connected to the common connector. A lock board is provided.
(2) The operation control unit supplies an operation unit capable of inputting a command for each magnetic force generation mechanism and electric power for setting each magnetic force generation mechanism to a commanded state based on the command from the operation unit. And a control unit.

(3) The operation control unit supplies power to each magnetic force generating mechanism on condition that a signal indicating that the magnetic force generating mechanism can be operated is received from the interlock panel.
(4) The magnetic force generation mechanism is configured to be switchable between an adsorption state in which the mold is adsorbed and a non-adsorption state in which the mold is not adsorbed, and the magnetic force generation mechanism incorporated in the platen or the mold mounting plate is An operation state display mechanism capable of displaying an index indicating whether the suction state or the non-suction state is provided on the platen or the mold mounting plate.
(5) Displacement detecting means for detecting that the mold fixed to each platen or the mold mounting plate is displaced or floating is provided, and each interlock panel is provided with a displacement detection means by the displacement detection means. A shift detection control unit is provided for outputting an emergency stop signal to the control unit of the injection molding machine when floating is detected.

(6) The deviation detecting means is a proximity switch.
(7) The deviation detecting means is configured to detect a deviation or floating of the mold from an induced current generated in the coil of the magnetic force generation mechanism.

It is a perspective view of the metal mold | die fixing system of Example 1. FIG. It is a front view of the principal part and metal mold | die of an injection molding machine. It is a side view of a stationary side platen and a clamp plate. It is a side view of a movable side platen and a clamp plate. It is a side view which shows the principal part of a magnet unit. It is a disassembled perspective view of a magnet unit. It is sectional drawing of the clamp plate (adsorption state) of a movable side platen. It is sectional drawing of the clamp plate (non-adsorption state) of a movable side platen. It is sectional drawing of the operation state display mechanism (adsorption state) provided in the clamp plate. It is sectional drawing of the operation state display mechanism (non-adsorption state) provided in the clamp plate. It is a block diagram of a control system of an injection molding machine and an operation control unit. It is a front view of an interlock board. It is a top view of an operation control unit. It is a front view of the principal part of the injection molding machine of Example 2, and a metal mold | die. 6 is a side view of a fixed side platen of Example 2. FIG. 6 is a side view of a movable side platen of Embodiment 2. FIG.

S Mold Fixing System 1 Injection Molding Machine 2 Fixed Side Platen 3 Movable Side Platens 11, 12 Clamp Plate 13 Magnet Unit 15 Operation Control Unit 16 Operation Unit 17 Control Unit 18b Female Connector (Common Connector)
19 Interlock panel 30 Operating state display mechanism 36 Proximity switch

  The best mode for carrying out the present invention will be described below with reference to the drawings.

  As shown in FIGS. 1 and 2, the mold fixing system S is applied to a molding factory having a plurality of injection molding machines 1, and this mold fixing system S is used for a plurality of injection molding machines 1. A plurality of magnet units 13 (see FIGS. 3 and 4) provided on a plurality of clamp plates 11 and 12 (which correspond to mold mounting plates) respectively provided on the platen surface of the fixed platen 2 and the movable platen 3; , A plurality of interlocking boards 19 respectively mounted on the plurality of injection molding machines 1, a plurality of common connectors 18 b (see FIG. 11) respectively mounted on the plurality of injection molding machines 1 and having the same structure, and a plurality of later-described plurality of connectors. An operating state display mechanism 30 capable of displaying an index indicating whether the magnet unit 13 is in an attracting state or a non-attracting state, and a step for detecting whether the mold M fixed to each of the clamp plates 11 and 12 is displaced or floated. Proximity switch 36 (see FIGS. 3 and 4) as the detecting means comprises a, and a set of portable operation control unit 15 to be selectively connected to a plurality of injection molding machines 1.

First, the injection molding machine 1 will be described.
As shown in FIG. 2, the injection molding machine 1 includes a pair of opposed platens 2 and 3 for fixing a mold M (a fixed mold M1 and a movable mold M2) as a clamp object, In order to clamp and open the mold M, the movable platen drive mechanism 4 having a hydraulic cylinder (or drive motor) that drives the platen 3 in the direction of approaching / separating the platen 2 and the platen 3 approaching / separating. An injection mechanism 6 having an injection cylinder 6a for supplying a synthetic resin in a molten state to a cavity in the mold M in a clamped state, and a movable mold An eject mechanism 7 that takes out a molded product from M2, a movable platen drive mechanism 4, an injection mechanism 6, a molding machine control unit 37 that controls various mechanisms related to injection molding such as the eject mechanism 7, and a power supply device 38 are provided ( (See Fig. 11)

  When injection molding is performed by the injection molding machine 1, the movable platen 3 is driven by the movable platen drive mechanism 4 in a direction approaching the fixed platen 2, and the movable mold M2 is pressed against the fixed mold M1. In this state, a molten synthetic resin is injected into the mold M from the tip of the injection cylinder 6a to form a molded product. Thereafter, the platen 3 is driven in a direction away from the platen 2 by the movable platen drive mechanism 4, and the movable mold M2 is separated from the fixed mold M1. In this state, the molded product is ejected from the movable mold M2 by the eject mechanism 7.

The eject mechanism 7 includes an ejector pin 8, an ejector plate 8a to which a base end portion of the ejector pin 8 is coupled, and a fluid pressure cylinder 8b that drives the ejector pin 8 to move forward and backward via the ejector plate 8a. The pin 8 is inserted through an ejector pin hole 3 c formed in the central portion of the platen 3.
Various mechanisms related to injection molding such as the movable platen drive mechanism 4, the injection mechanism 6, and the eject mechanism 7 are provided with sensors, and signals from the plurality of sensors are transmitted to the molding machine control unit 37, respectively.
As shown in FIGS. 3 and 4, the platens 2 and 3 are each formed in a square shape in a side view, and the four guide rods 5 are inserted into the insertion holes 2 a in the vicinity of the four corners of the platen 2. The four guide rods 5 are slidably inserted into the insertion holes 3a in the vicinity of the four corners of the platen 3 so that the platen 3 can approach / separate from the platen 2. Guided.

Next, a magnetic-type fixing device 10A that fixes the fixed mold M1 to the platen 2 and a magnetic-type fixing device 10B that fixes the movable mold M2 to the platen 3 will be described.
As shown in FIGS. 2 to 4, the magnetic-type fixing device 10 </ b> A includes a clamp plate 11 having a fixing surface 11 a for fixing the mold M <b> 1 to the platen 2, and a clamp plate 11 provided on the clamp plate 11. A plurality of magnet units 13 for generating a magnetic force to be fixed to the fixed surface 11a (this corresponds to a magnetic force generation mechanism) and an index indicating whether the plurality of magnet units 13 provided on the clamp plate 11 are in an attracting state or a non-attracting state are displayed. And a possible operating state display mechanism 30.

  The magnetic-type fixing device 10B generates a magnetic force that is provided on the clamp plate 12 and fixes the mold M2 to the fixing surface 12a. The clamp plate 12 includes a fixing surface 12a for fixing the mold M2 to the platen 3. A plurality of magnet units 13 (which correspond to a magnetic force generation mechanism) and an operation state display mechanism 30 capable of displaying an index indicating whether the plurality of magnet units 13 provided on the clamp plate 12 are in an attracting state or a non-attracting state are provided. ing.

  Next, a description will be given of the clamp plates 11 respectively provided on the platen 2 of the plurality of injection molding machines 1. As shown in FIGS. 2 and 3, the clamp plate 11 is a steel plate that is a magnetic body of substantially the same size as the platen 2, and substantially square portions corresponding to the four corners of the platen 2 are removed. Yes. The clamp plate 11 is fixed to the surface of the platen 2 with a plurality of bolts 14. The clamp plate 11 is provided with a plurality of magnet units 13 that generate magnetic force for fixing the mold M1 to the fixed surface 11a.

  In the clamp plate 11, a pair of connectors 21 are attached to the rear end portion, and a locate ring 11c is attached to the center portion. The locate ring 11c is for positioning the mold M1 on the fixed surface 11a by fitting the locate ring of the mold M1. The operation state display mechanism 30 is provided at the front end of the clamp plate 11.

  Next, a description will be given of the clamp plates 12 respectively provided on the platen 3 of the plurality of injection molding machines 1. As shown in FIGS. 2 and 4, the clamp plate 12 is a steel plate that is a magnetic body of substantially the same size as the platen 2, and substantially square portions corresponding to the four corners of the platen 2 are removed. Yes. The clamp plate 12 is fixed to the surface of the platen 3 with a plurality of bolts 14. The clamp plate 12 is provided with a plurality of magnet units 13 that generate magnetic force for fixing the mold M2 to the fixing surface 12a.

  In the clamp plate 12, a pair of connectors 22 is mounted at the rear end, a drop prevention block 28 is mounted at the lower end to prevent the mold M2 from dropping, and a pair of ejector pin holes 3c are formed at the center. Is provided. Note that a suspension piece (not shown) is mounted on the upper ends of the fixed mold M1 and the movable mold M2, and a wire of a conveyance means such as a crane is connected to the suspension piece to convey the molds M1 and M2. The operating state display mechanism 30 is provided at the front end of the clamp plate 12.

Next, the magnet unit 13 will be described in detail.
As shown in FIG. 3, on the clamp plate 11 of the platen 2, three magnet units 13 are arranged adjacent to each other in the vertical and horizontal directions to form a set of magnet units, and the center of the clamp plate 11 is used as a reference. Four sets of magnet units, a total of twelve magnet units 13 are arranged at point symmetry positions. A proximity switch 36 serving as a displacement detecting means is provided at the center of the fixed surface 11a of the clamp plate 11.

As shown in FIG. 4, on the clamp plate 12 of the platen 3, four magnet units 13 are arranged adjacent to each other vertically and horizontally to form a set of first magnet unit groups, and the center of the clamp plate 11 is used as a reference. The four magnet unit groups, a total of 16 magnet units 13, are arranged at the point symmetrical positions. A proximity switch 36 serving as a displacement detecting means is provided at the center of the fixed surface 12a of the clamp plate 12.
The arrangement of the plurality of magnet units 13 can be appropriately changed based on the shape and size of the clamp plate 11 and the shape and size of the mold M to be fixed.

  Next, the magnet unit 13 incorporated in the clamp plate 12 will be described as an example. As shown in FIGS. 5 to 7, the magnet unit 13 includes a steel block 24 (which corresponds to a magnetic member) made of a magnetic material facing the fixed surface 12 a and a first alnico magnet disposed on the back side thereof. 25, a first coil 23 wound around the first alnico magnet 25 and for switching the polarity of the first alnico magnet 25, and a plurality (for example, eight) of a plurality of (for example, eight) disposed on the outer peripheral side of the steel block 24 The magnet unit 13 includes a permanent magnet 26 made of a neodymium magnet, and is configured to be switchable between an adsorption state in which the mold M2 is adsorbed and a non-adsorption state in which the mold M2 is not adsorbed. The permanent magnets 26 between the adjacent magnet units 13 are also used as the permanent magnets 26 of those magnet units 13.

  The steel block 24 and the first alnico magnet 25 are formed in a square shape, the steel block 24 is formed with a bolt hole 24a, and the first alnico magnet 25 is formed with a hole 25a. In a state where the first alnico magnet 25 and the first coil 23 disposed in the recess 12b are sandwiched between the steel block 24 and the bottom wall portion 12c of the clamp plate 12, these are the bolt hole 24a and the hole portion 25a. Are fastened to the clamp plate 12 by hexagon socket head bolts 27 made of a non-magnetic material (for example, SUS304). The plurality of permanent magnets 26 are fixed to the steel block 24 and the clamp plate 12 by some fixing means.

  As shown in FIG. 7, in two adjacent magnet units 13, the polarity of the permanent magnet 26 with respect to one steel block 24 and the polarity of the permanent magnet 26 with respect to the other steel block 24 are reversed. The first alnico magnet 25 can be reversed in polarity by magnetic induction of the magnetic field generated by the first coil 23, but in the two adjacent magnet units 13, the first alnico magnet 25 with respect to one steel block 24 The polarity of the first alnico magnet 25 with respect to the other steel block 24 is reversed.

  The proximity switch 36 provided on the clamp plates 11, 12 is turned on when the mold M contacts the proximity switch 36 when the mold M is fixed to the clamp plates 11, 12. , 12 when the mold M is displaced or floated, the proximity switch 36 is turned off when the mold M is separated from the proximity switch 36, indicating that the displacement or lifting of the mold M is detected. A mold misalignment detection signal is transmitted to the interlock panel 19.

Next, the operation state display mechanism 30 will be described.
As shown in FIGS. 2 to 4, the operating state display mechanism 30 is provided at the front end of each of the clamp plates 11 and 12, but these basically have the same structure. The provided operating state display mechanism 30 will be described.

  As shown in FIG. 9 and FIG. 10, the operation state display mechanism 30 is a plate-like member made of a steel case member 31 incorporated in the clamp plate 12 and a transparent acrylic resin that covers the front side of the case member 31. The cover member 35, the first accommodation hole 31a formed in the case member 31, the columnar second alnico magnet 32 accommodated in the first accommodation hole 31a, and the outer fitting of the second alnico magnet 32 A resin coil bobbin 32a, a second coil 33 wound around the coil bobbin 32a, and a second housing hole 31b formed in the case member 31 on the inlet side of the first housing hole 31a are reversibly housed. A disk-like permanent magnet 34.

  A hole 12d is formed near the lower end of the front end of the clamp plate 12, and a case member 31 is incorporated in the hole 12d. A cylindrical first accommodation hole 31a is formed in the rear part of the case member 31, and a cylindrical second accommodation hole 31b that opens forward is provided on the front side (inlet side) of the case member 31 with respect to the first accommodation hole 31a. The second receiving hole 31b communicates with the first receiving hole 31a.

  The first accommodation hole 31a is accommodated in a state where the second coil 33 is wound around the coil bobbin 32a accommodating the second alnico magnet 32, and the permanent magnet 34 is accommodated in the second accommodation hole 31b in the second accommodation hole 31b. It is accommodated in a reversible manner. The clamp plate 12 is provided with an energization circuit for energizing the second coil 33 only when energizing the plurality of first coils 23 of the plurality of magnet units 13.

  A red display surface 34a colored in red (this corresponds to an index) is formed at one end of the permanent magnet 34, and a white display surface 34b (which is colored in white) is formed at the other end of the permanent magnet 34. Corresponding to the index) is formed. When the red display surface 34a is directed to the front surface, it indicates that the plurality of magnet units 13 are in the attracted state, and when the white display surface 34b is directed to the front surface, the plurality of magnet units 13 are in the non-adsorbed state. Indicates.

  The lid member 35 is fixed to the clamp plate 12 with four screws 35a in a state where the front side of the case member 31 is closed. In the operation state display mechanism 30, either the red display surface 34 a or the white display surface 34 b of the permanent magnet 34 is displayed outward, and the red display surface 34 a of the permanent magnet 34 displayed on the operation state display mechanism 30. Alternatively, it is possible to identify whether the plurality of magnet units 13 are attracted or not attracted by viewing the white display surface 34b.

  As shown in FIG. 7, when the mold M2 is fixed to the fixing surface 12a of the clamp plate 12, when the first alnico magnet 25 is switched as shown in FIG. Become. At this time, simultaneously with the switching of the first alnico magnet 25, the second alnico magnet 32 of the operating state display mechanism 30 is also switched as shown in FIG. 9, the permanent magnet 34 is reversed, and the operating state display mechanism 30 displays red. The surface 34a is displayed. Therefore, the operator can identify that the plurality of magnet units 13 of the clamp plate 12 are in the attracted state.

  On the other hand, when the mold M2 is released from the fixing surface 12a of the clamp plate 12, the polarity of the first alnico magnet 25 is switched as shown in FIG. 8, and each magnet unit 13 is brought into a non-adsorption state. At this time, simultaneously with the switching of the first alnico magnet 25, the polarity of the second alnico magnet 32 is switched as shown in FIG. 10, the permanent magnet 34 is reversed, and the operating state display mechanism 30 displays the white display surface 34b. To do. Therefore, the operator can identify that the plurality of magnet units 13 of the clamp plate 12 are in the non-adsorption state.

Next, the control system will be described.
A molding machine control unit 37 shown in FIG. 11 includes a computer including a CPU, a ROM, and a RAM, an input / output interface, and the like. The molding machine control unit 37 controls various mechanisms related to injection molding, such as the movable platen drive mechanism 4, the injection mechanism 6, and the eject mechanism 7.

  The molding machine control unit 37 receives a plurality of signals from a plurality of sensors provided in various mechanisms related to injection molding, and based on these signals, the mold M is securely fixed or released. When it is determined whether or not the necessary condition is satisfied, and it is determined that the necessary condition is satisfied, the molding machine control unit 37 confirms that the magnet unit 13 of the clamp plates 11 and 12 is operable. The operation permission signal shown is transmitted to the operation control unit 15 via the interlock panel 19. Further, the molding machine control unit 37 receives the emergency stop signal transmitted from the interlock panel 19 when the proximity switch 36 detects the displacement or lifting of the mold M, and drives the movable panel as will be described later. Various mechanisms related to injection molding, such as the mechanism 4, the injection mechanism 6, and the eject mechanism 7, are urgently stopped.

  As shown in FIGS. 1, 11, and 12, the interlock panel 19 converts AC power supplied from a computer including a CPU, ROM, and RAM, an input / output interface, and a power supply device 38 into DC power. In addition, a power supply circuit for adjusting the voltage and a switching circuit for switching the connection state of the proximity switch 36 are included. The interlock panel 19 is connected to the molding machine control unit 37 and the power supply device 38, and is connected to the plurality of first coils 23, the second coil 33, and the proximity switch 36 of the clamp plate 11 via the connector 21, A plurality of first coils 23, second coils 33, and proximity switches 36 of the clamp plate 12 are connected via the connector 22.

  On the front surface of the interlock panel 19, a female connector portion 18b (common connector) that can be connected to the male connector portion 18a of the operation control unit 15 and a notification lamp 20 for notifying that the mold M has shifted or floated are provided. It has been. When the mold M is displaced or floated, when the interlock panel 19 receives a mold displacement detection signal from the proximity switch 36 of the clamp plates 11 and 12, the notification lamp 20 is caused to emit light and the molding machine control unit. A shift detection control unit that transmits an emergency stop signal to 37 is provided in the interlock panel 19, and this shift detection control unit is configured by a computer of the interlock panel 19.

  Direct current power for driving the first and second coils is supplied from the power supply circuit of the interlock panel 19 to the operation control unit 15. The switching circuit of the interlock panel 19 is switched so that the connection with the proximity switch 36 is disconnected in a state where the mold M is not fixed, and the mold displacement detection signal from the proximity switch 36 is switched to the interlock panel 19. Not sent to the microcomputer. During the period from the time when the mold M is fixed to the time when the mold M is released, the switching circuit is switched so that the mold displacement detection signal from the proximity switch 36 can be transmitted to the computer of the interlock panel 19.

  As shown in FIGS. 1, 11, and 13, the operation control unit 15 is based on an operation unit 16 that can input commands to the plurality of magnet units 13 of the clamp plates 11 and 12, and a command from the operation unit 16. The control unit 17 that supplies power to the magnet unit 13 to bring the magnet units 13 of the clamp plates 11 and 12 into an attracted state or a non-adsorbed state, and direct current to the first and second coils 23 and 33 of the clamp plates 11 and 12 The interlocking board 19 of any one injection molding machine 1 has a drive circuit 17a, 17b for supplying electric power and is connected to a common female connector part 18b of a plurality of interlocking boards 19 via a male connector part 18a. It is configured to be connectable.

  The operation unit 16 on the upper surface of the operation control unit 15 is provided with a changeover switch 16a for selectively switching the operation object between the clamp plate 11 of the stationary platen 2 and the clamp plate 12 of the platen 3, and the fixing of the mold M. An operation button 16b for instructing, an operation button 16c for instructing the release of the mold M, and a reset button 16d are provided.

  The control unit 17 includes a computer including a CPU, a ROM, and a RAM, an input / output interface, and the like. The input / output interface of the control unit 17 is provided with the drive circuits 17a and 17b. The control unit 17 supplies electric power to the magnet units 13 of the clamp plates 11 and 12 based on a command from the operation unit 16 on the condition that the operation enable signal is received from the interlock panel 19, and from the attracting state. Switch to the non-adsorption state or from the non-adsorption state to the adsorption state. In parallel with this switching, the control unit 17 energizes the second coil 33 of the clamp plates 11 and 12 to switch the display of the operation state display mechanism 30, and displays the red display surface 34a when in the suction state. In the non-adsorption state, the white display surface 34b is displayed.

Next, the operation and effect of the mold fixing system S will be described.
First, when the mold M is fixed to the platens 2 and 3, the mold M in a state where the molds M <b> 1 and M <b> 2 are connected is transported between the platen 2 and the platen 3 by a transport unit such as a crane. At this time, after the operation control unit 15 is connected to the interlock panel 19 via the connector 18, the plurality of magnet units 13 of the clamp plates 11 and 12 are brought into a non-adsorption state as shown in FIG. This is performed in a state where the magnetic force by the magnet unit 13 does not act.

When the magnet units 13 of the clamp plates 11 and 12 are switched to the non-adsorption state, the second alnico magnet 32 of the operating state display mechanism 30 is also switched and switched to a state of displaying the white display surface 34b.
Next, the molds M1 and M2 are positioned and brought into contact with the fixed surfaces 11a and 12a of the clamp plates 11 and 12 of the platens 2 and 3, and the circular convex portion of the mold M1 is placed on the locating ring 11c of the fixed platen 11. Center it by fitting.

  When the molds M1 and M2 are fixed to the fixing surfaces 11a and 12a of the clamp plates 11 and 12, the operation button is switched to the magnet unit 13 of the clamp plate 11 or the magnet unit 13 of the clamp plate 12 by the changeover switch 16a. 16b is operated.

  When the mold M1 is fixed to the fixing surface 11a of the clamp plate 11, power is supplied from the control unit 17 to each magnet unit 13 of the clamp plate 11, and the first coil 23 is energized in a predetermined direction for several seconds, As shown in FIG. 7, the polarity of the first alnico magnet 25 is switched, and a magnetic circuit having the mold M as a part of the magnetic path is formed and brought into an attracted state. At this time, the second alnico magnet 32 of the operation state display 30 is also switched at the same time, and is switched to a state of displaying the red display surface 34a.

  Next, when the mold M2 is fixed to the fixing surface 12a of the clamp plate 12, electric power is supplied to each magnet unit 13 of the clamp plate 12 in the same procedure as that on the platen 2 side. The operation state display 30 provided on the clamp plate 12 is also switched in the same manner as described above. Thereafter, the connector 18 is cut off, and the operation control unit 15 is removed from the interlock panel 19, and this operation control unit 15 is connected to another injection molding machine 1 that performs next mold solid replacement.

  Next, when releasing the fixation of the mold M <b> 1 from the fixing surface 11 a of the clamp plate 11, electric power is supplied from the control unit 17 to each magnet unit 13 of the clamp plate 11, and the mold M <b> 1 is fixed to the first coil 23. As shown in FIG. 8, the polarity of the first alnico magnet 25 is switched, and each magnet unit 13 is switched to the non-attraction state. In parallel with this, the polarity of the second alnico magnet 32 of the operating state display mechanism 30 is switched so as to display the white display surface 34b.

  Next, also when releasing fixation of the metal mold | die M2 from the fixing surface 12a of the clamp plate 12, it carries out similarly to the above. Thereafter, the connector 18 is divided, and the operation control unit 15 is removed from the interlock panel 19 and then connected to another injection molding machine 1 for exchanging the mold.

  Thus, the common female connector part 18b of the connector 18 is provided in the plurality of injection molding machines 1 installed in the molding factory, and the male connector part 18a of the one set of operation control unit 15 is connected to any injection molding machine 1. Since it is configured to be connectable to the female connector portion 18 and one set of operation control units 15 is shared by the plurality of injection molding machines 1, it is not necessary to provide each injection molding machine 1 with an operation control unit for attaching and detaching molds. Equipment costs for attaching / detaching the mold to / from the plurality of injection molding machines 1 can be greatly reduced.

Since the operation state display mechanism 30 is provided so as to display whether the plurality of magnet units 13 are in the adsorption state or the non-adsorption state, even in a state where the operation control unit 15 is separated from the injection molding machine 1, it is determined whether the adsorption state is in the non-adsorption state. The adsorption state can be easily identified.
In addition, when the deviation of the mold is detected by the proximity switch 36, the injection molding machine 1 is brought into an emergency stop state, so that safety can be ensured.

Here, the example which changes the said Example partially is demonstrated.
[1] Instead of providing the proximity switch 36 as the displacement detecting means, a galvanometer or the like is provided in a part of the magnet units 13 of the plurality of magnet units 13 arranged in the clamp plates 11 and 12, and the magnet unit You may comprise so that the shift | offset | difference and floating of a metal mold | die may be detected from the induced current which arises in 13 1st coils 23. FIG.
[2] The mold fixing system S can be applied to a mold fixing system of a blow molding machine in addition to an injection molding machine.

[3] Instead of providing the operation state display device 30 at the front ends of the clamp plates 11 and 12, the operation state display device 30 may be provided on the fixed surfaces 11a and 12a of the clamp plates 11 and 12.
[4] The interlock panel 19 is incorporated in a set of portable operation control units 15, and the operation control unit 15 is connected to the connectors 21 and 22 of the clamp plates 11 and 12 and the molding machine control unit 37 via the connector 18. You may comprise so that connection to the power supply device 38 is possible.
[5] In addition, it goes without saying that those skilled in the art can implement the invention in a form in which changes are made to the above-described embodiments without departing from the spirit of the present invention.

Next, the mold fixing system S of Example 2 will be described. However, the same reference numerals are given to the same components as those in the above embodiment, and only different components will be described.
As shown in FIGS. 14 to 16, in this mold fixing system S, instead of providing clamp plates 11 and 12 incorporating a plurality of magnet units 13, a plurality of magnets are provided on the fixed side platen 2 and the movable side platen 3. Each of the units 13 is provided.

  The platen 2 is provided with a plurality of magnet units 13 that generate magnetic force for fixing the mold M1 to the fixed surface 2b. A connector 21 is attached to the rear end of the platen 2, and a locating ring 2c for positioning the mold M1 on the fixed surface 2b is attached to the center portion. A proximity switch 36 serving as a displacement detecting means is provided at the center of the fixed surface 2b of the platen 2, and a plurality of magnet units 13 provided on the platen 2 are in an attracted state or a non-adsorbed state at the front end of the platen 2. An operating state display mechanism 30 capable of displaying an index indicating the above is provided.

  The platen 3 is provided with a plurality of magnet units 13 that generate magnetic force for fixing the mold M2 to the fixing surface 3b. A pair of connectors 22 is attached to the rear end of the platen 3, a drop prevention block 28 is attached to the lower end to prevent the mold M2 from dropping, and a pair of ejector pin holes 3c are provided in the center. ing. A proximity switch 36 serving as a displacement detecting means is provided at the center of the fixed surface 3b of the platen 3, and a plurality of magnet units 13 provided on the platen 3 are in an attracted state or a non-adsorbed state at the front end of the platen board 3. An operating state display mechanism 30 capable of displaying an index indicating the above is provided.

  In this way, the clamp plate is omitted, and the plurality of magnet units 13 are incorporated in the platens 2 and 3, respectively, so that the distance from the tip of the injection nozzle of the injection cylinder 6a of the injection mechanism 6 to the molding cavity of the mold M is shortened. can do. In addition, the same operations and effects as those of the first embodiment are obtained. In addition, it goes without saying that those skilled in the art can implement the present invention in a form in which changes are made to the above embodiments without departing from the spirit of the present invention.

  It can be applied to a mold fixing system for multiple injection molding machines each equipped with multiple magnetic force generation mechanisms that generate magnetic force for mold fixation, and the equipment cost in a molding factory where multiple injection molding machines are installed Can be saved.

Claims (8)

A mold fixing system for a plurality of injection molding machines each having a pair of platens,
A plurality of magnetic force generation mechanisms which are respectively provided in a plurality of injection molding machines and generate magnetic force for fixing the mold to a mold mounting plate fixed to the platen or the platen;
A plurality of common connectors, each of which is equipped with a plurality of injection molding machines, and has the same structure in which the magnetic force generation mechanism of the injection molding machine, the control unit, and the power supply device are electrically connected;
A set of portable operation control units that are selectively connected to a plurality of injection molding machines, and a magnetic force generation mechanism and control of any one injection molding machine via a connector connectable to the common connector a set of the operation control unit electrically connectable to the unit and the power supply and,
A mold fixing system characterized by comprising:   A plurality of interlocking boards that are respectively provided in a plurality of injection molding machines and are electrically connected to the magnetic force generation mechanism, the control unit, and the power supply device of the injection molding machine and electrically connected to the common connector. The mold fixing system according to claim 1, wherein the mold fixing system is provided.   The operation control unit includes an operation unit that can input a command for each magnetic force generation mechanism, and a control unit that supplies the magnetic force generation mechanism with electric power that causes each magnetic force generation mechanism to be commanded based on the command from the operation unit. The mold fixing system according to claim 1 or 2, characterized by comprising:   4. The operation control unit supplies power to each magnetic force generation mechanism on condition that a signal indicating that each magnetic force generation mechanism can be operated is received from the interlock panel. Mold fixing system as described in. The magnetic force generation mechanism is configured to be switchable between an adsorption state in which the mold is adsorbed and a non-adsorption state in which the mold is not adsorbed.
An operating state display mechanism capable of displaying an index indicating whether the magnetic force generating mechanism incorporated in the platen or the mold mounting plate is in an attracted state or a non-adsorbed state is provided on the platen or the mold mounting plate. The mold fixing system according to claim 1 or 2.   Displacement detecting means for detecting whether the mold fixed to each platen or the mold mounting plate is displaced or floating is provided, and the displacement detecting means detects the displacement or lifting of the mold on each interlock panel. 3. The mold fixing system according to claim 1, further comprising a displacement detection control unit that outputs an emergency stop signal to the control unit of the injection molding machine when the operation is performed.   The mold fixing system according to claim 6, wherein the deviation detecting unit includes a proximity switch.   The mold fixing system according to claim 6, wherein the deviation detecting unit is configured to detect a deviation or floating of the mold from an induced current generated in a coil of the magnetic force generation mechanism.

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