JP4921546B2 - Magnetic fixing device - Google Patents

Description

  The present invention relates to a magnetic fixing device incorporated in a clamp plate of an injection molding machine or the like, and in particular, allows an operator to easily identify whether a plurality of magnetic force generation mechanisms that adsorb a clamp target are in an adsorption state or a non-adsorption state. It relates to what is configured.

  Conventionally, in an injection molding machine, a mold (a fixed mold and a movable mold) is fixed to a platen such as a fixed plate or a movable plate so that the movable platen approaches or separates from the fixed platen. By moving and driving, 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 by using a plurality of bolts or a hydraulic clamping device. However, in recent years, a clamp plate in which a plurality of magnetic force generation mechanisms are incorporated in the platen ( A magnetic-type fixing device is being put into practical use in which a magnet plate is attached and a die is attracted and fixed to the fixing surface of the clamp plate by its magnetic force.

  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 of the above magnet units includes a steel block, a plurality of permanent magnets arranged on the outer peripheral side of the steel block, an alnico magnet arranged on the back side of the steel block, and an outer periphery of the alnico magnet. The direction of the magnetic field of the alnico magnet can be switched to the opposite direction according to the direction of energization of 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 the coil is energized for a few seconds, and the magnetic field direction (polarity) of the Alnico magnet The alnico magnet and the permanent magnet are used to form a magnetic circuit in which the mold becomes a part of the magnetic path, and each magnet unit is switched to an attracting state that attracts the mold.

On the other hand, when releasing the mold, by operating the operation panel, the mold is removed by switching the polarity of the alnico magnet by energizing for several seconds in the opposite direction to the case of attracting the mold to the coil. A magnetic circuit that is not part of the magnetic path is formed, and each magnet unit is switched to a non-adsorption state in which the mold is not adsorbed.
JP 2005-169840 A

  By the way, in the conventional magnetic type fixing device, since the magnet unit is not informed to the part other than the operation panel whether the magnet unit is in the attracted state or in the non-adsorbed state, a plurality of magnets are fixed after the mold is fixed or fixed. There is a problem that the operator cannot easily identify whether the unit is in an adsorption state or a non-adsorption state.

  Here, each injection molding machine is provided with an operation panel and a control unit for attaching and detaching the mold. These operation panel and control unit are energized for several seconds to exchange a plurality of magnet units. It is used only when it is used, and is not used at other times. Therefore, it is conceivable to share a set of operation panel and control unit with a plurality of injection molding machines without providing an operation panel and control unit for attaching and detaching molds to each injection molding machine. In this case, in the injection molding machine separated from the operation panel and the control unit, the operator cannot easily identify whether the plurality of magnet units are in the attracted state or the non-adsorbed state.

  An object of the present invention is a magnetic-type fixing device in which a plurality of magnetic force generation mechanisms are incorporated in a clamp plate, and makes it easy to identify whether the magnetic force generation mechanism is in an adsorption state or a non-adsorption state in the vicinity of the clamp plate. It is an object of the present invention to provide a magnetic fixing device that can easily identify whether the magnetic force generation mechanism is in an adsorption state or a non-adsorption state even when the operation panel and the control unit are separated.

A magnetic fixing device according to the present invention includes a clamp plate having a fixing surface for fixing a clamp object such as a mold, and a plurality of magnetic force generation mechanisms that are incorporated in the clamp plate and fix the clamp object to the fixing surface by a magnetic force. Each magnetic force generating mechanism includes a magnetic member facing the fixed surface, a plurality of permanent magnets disposed on the outer peripheral side of the magnetic member, and a rear surface side of the magnetic member. The first alnico magnet and the first coil for switching the polarity of the first alnico magnet are provided, and can be switched between an attracting state for attracting the clamped object and a non-adsorbing state for not attracting the clamped object. is configured, the fixed surface or the outer peripheral surface of the clamping plate, said plurality of magnetic force generation mechanisms are displayable operation state indication mechanism an index indicating whether unadsorbed state or adsorbed state provided, The operation state display mechanism includes a second alnico magnet, a second coil wound around the second alnico magnet and electrically connected in parallel with the first coil, and a movable display member having a permanent magnet. An energization circuit for energizing the second coil only when energizing the plurality of first coils of the plurality of magnetic force generation mechanisms is provided .

According to the magnetic force type fixing device of the present invention, an operation state display mechanism capable of displaying an index indicating whether a plurality of magnetic force generation mechanisms are in an adsorption state or a non-adsorption state is provided on the fixing surface or outer peripheral surface of the clamp plate. In the vicinity of the clamp plate, it is possible to easily identify whether the magnetic force generation mechanism is in an attracted state or a non-adsorbed state.
Even when a set of operation panels and control units for attaching and detaching molds are shared by a plurality of magnetic fixing devices, the magnetic force generating mechanism can be used even when the magnetic fixing devices are separated from the operating panels and control units. An operator can easily identify the adsorption state or the non-adsorption state.

In addition to the above-described configuration of the present invention, the following various configurations may be employed.
(1) The operation state display mechanism includes a case member incorporated in the clamp plate, a transparent lid member that covers the front side of the case member, and the second alnico magnet and the second coil formed on the case member. a first accommodation hole accommodating the, and a second accommodation hole for accommodating the first housing than the hole formed in the case member on the inlet side the movable display member.

(2) The movable display member is composed of a disk-shaped permanent magnet that can be reversed in the second accommodation hole, and an index is marked on an end surface of the disk-shaped permanent magnet.
(3) The movable display member is composed of a columnar permanent magnet that can be reversed in the second accommodation hole, and an index is marked on the end surface of the columnar permanent magnet. The length direction of the columnar permanent magnet A pin member that rotatably supports the intermediate portion is provided.

  (4) The movable display member is constituted by a cylindrical permanent magnet accommodated in the second accommodation hole so as to be movable in a predetermined stroke in the axial direction, and an index is marked on an end surface of the cylindrical permanent magnet. . (5) The magnetic fixing device is provided on a platen of an injection molding machine.

It is a front view of the principal part and metal mold | die of the injection molding machine of Example 1 of this invention. 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 of the principal part of a clamp plate and a magnet unit. It is a disassembled perspective view of a magnet unit. It is sectional drawing of the clamp plate (attraction | suction state) provided in the platen. It is sectional drawing of the clamp plate (non-adsorption state) provided in the 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 the control system of an operation control part and a magnetic-type fixing device. It is sectional drawing of the operation state display mechanism (adsorption state) of the example of a change. It is sectional drawing of the operation state display mechanism (adsorption state) of another example of a change. It is sectional drawing of the operation state display mechanism (non-adsorption state) of another modified example. It is sectional drawing of the operation state display mechanism (adsorption state) of the example of a change of FIG. It is sectional drawing of the operation state display mechanism (non-adsorption state) of another modified example. It is sectional drawing of the operation state display mechanism (adsorption state) of the example of a change of FIG. It is a front view of the principal part of the injection molding machine of Example 2, and a metal mold | die. It is a perspective view of the magnetic-type fixing device of Example 3.

DESCRIPTION OF SYMBOLS 1 Injection molding machine 2 Fixed side platen 3 Movable side platen 10A, 10B, 10C Magnetic type fixing device 11, 12, 60 Clamp plate 13 Magnet unit 20 Steel block 21 First alnico magnet 22 First coil 23 Permanent magnet 30, 30A -30G, 50 Operating state display mechanism 31 Case member 31a First receiving hole 32 Second alnico magnet 33 Second coils 34, 36, 39, 40 Movable display members 34a, 36a, red display surfaces 34b, 36b White display surface 35, 41 Lid member 37 Pin members 39a, 40a Red display part 39b White display part 42 Indicator bar

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

  Since this embodiment is an example when the present invention is applied to an injection molding machine, the injection molding machine 1 will be described first. As shown in FIG. 1, the injection molding machine 1 includes a fixed side platen 2 and a movable side platen that are opposed to each other for fixing a mold M (fixed side mold M1 and movable side mold M2) as a clamp object. 3, a platen drive mechanism 4 having a hydraulic cylinder (or drive motor) that drives the platen 3 in a direction to approach / separate the platen 2 in order to perform clamping and opening of the mold M, and a platen 3 An injection mechanism 6 having four guide rods 5 that are guided and supported movably in the approach / separation direction, an injection cylinder 6a that injects molten synthetic resin into a cavity in the mold M in a mold-clamped state, and a mold An eject mechanism 7 for extruding a molded product from M2 is provided.

When injection molding is performed by the injection molding machine 1, the platen drive mechanism 4 drives the platen 3 in a direction approaching the platen 2, and the mold M <b> 2 is pressed against the mold M <b> 1 to enter a clamped 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 drive mechanism 4 drives the platen 3 in a direction away from the platen 2 to enter the mold open state. In this state, the molded product is ejected from the mold M2 by the eject mechanism 7.
The eject mechanism 7 includes an ejector pin 8, an ejector plate 8a, and a fluid pressure cylinder 8b that drives the ejector pin 8 to move forward and backward through the ejector plate 8a, and the ejector pin 8 is inserted into the ejector pin hole 3c. .
As shown in FIGS. 1 to 3, 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 mold M1 to the platen 2 and a magnetic type fixing device 10B that fixes the mold M2 to the platen 3 will be described.
As shown in FIGS. 1 to 3, the magnetic force 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 mold provided on the clamp plate 11 and magnetically. A plurality of magnet units 13 (magnetic force generating mechanism) for generating an attractive force for fixing M1 to the fixed surface 11a, and an operation state display mechanism 30 provided at the front end portion (outer peripheral surface) of the clamp plate 11 are provided. The operation state display mechanism 30 displays an index indicating whether the plurality of magnet units 13 are in an attracting state or a non-attracting state.

  The magnetic-type fixing device 10B includes a clamp plate 12 having a fixing surface 12a for fixing the mold M2 to the platen 3, and an adsorption force that is provided on the clamp plate 12 and fixes the mold M2 to the fixing surface 12a by magnetic force. Are provided with a plurality of magnet units 13 (magnetic force generation mechanism) and an operation state display mechanism 30 provided at the front end (outer peripheral surface) of the clamp plate 12. The operation state display mechanism 30 displays an index indicating whether the plurality of magnet units 13 are in an attracting state or a non-attracting state.

The clamp plate 11 is a steel plate that is a magnetic body having substantially the same size as the platen 2, and substantially square portions corresponding to the four corners of the platen 2 are removed. The clamp plate 11 is fixed to the surface of the platen 2 with a plurality of bolts 14.
The clamp plate 12 is a steel plate that is a magnetic body having substantially the same size as the platen 2, and substantially square portions corresponding to the four corners of the platen 2 are removed. The clamp plate 12 is fixed to the surface of the platen 3 with a plurality of bolts 14.

  As shown in FIGS. 1 and 2, in the clamp plate 11, a connector 25 capable of connecting / separating a plurality of electric wires is attached to the rear end portion, and a locate ring 11 c is attached to the center portion. The connector 25 is for connecting electrical wiring for supplying current to the plurality of magnet units 13. The locate ring 11c is for centering the mold M1 on the fixed surface 11a by fitting a locate ring (not shown) of the mold M1.

  As shown in FIGS. 1 and 3, the clamp plate 12 is provided with a connector 26 capable of connecting / separating a plurality of electric wires at the rear end portion, and the lower end portion is prevented from falling to prevent the mold M2 from dropping. A block 27 is mounted, and a pair of ejector pin holes 3c is provided at the center. The connector 26 has the same function as the connector 25. When the mold M is exchanged, the mold M is carried in or out by a known conveying means.

Next, the magnet unit 13 will be described in detail.
A plurality of magnet units 13 are incorporated in the clamp plates 11 and 12 in different arrangements. For example, as shown in FIG. 2, the clamp plate 11 of the stationary platen 2 has three magnet units 13 arranged adjacent to each other in the vertical and horizontal directions to form a set of magnet units. Four sets of magnet units, a total of twelve magnet units 13 are arranged at point-symmetric positions with respect to the center.

  As shown in FIG. 3, the clamp plate 12 of the movable side platen 3 has four magnet units 13 arranged vertically adjacent to each other to form a first magnet unit group, and the center of the clamp plate 11. 4 sets of magnet unit groups, a total of 16 magnet units 13 are arranged at point-symmetrical positions with respect to. The arrangement of the plurality of magnet units 13 is appropriately set according to the shape and size of the clamp plate 11, the shape and size of the mold M, and the like. Since these magnet units 13 have the same structure, the magnet unit 13 provided on the clamp plate 12 will be described.

  As shown in FIGS. 4 to 7, the magnet unit 13 includes a steel block 20 (magnetic member) made of a magnetic material facing the fixed surface 12a, a first alnico magnet 21 disposed on the back side thereof, A permanent coil comprising a first coil 22 wound around one alnico magnet 21 and for switching the polarity of the first alnico magnet, and a plurality of (e.g., eight) neodymium magnets disposed on the outer peripheral side of the steel block 20. And a magnet 23. The magnet unit 13 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 magnet 23 between the adjacent magnet units 13 is also used as both of the magnet units 13.

  The steel block 20 and the first alnico magnet 21 are formed in a square shape, the steel block 20 has a bolt hole 20a, and the first alnico magnet 21 has a hole 21a. In a state where the first alnico magnet 21 and the first coil 22 disposed in the recess 12b are sandwiched between the steel block 20 and the bottom wall portion 12c of the clamp plate 12, these are the bolt hole 20a and the hole portion 21a. Are fastened to the clamp plate 12 by hexagon socket head bolts 24 made of a non-magnetic material (for example, SUS304). The plurality of permanent magnets 23 are fixed to the steel block 20 and the clamp plate 12 by some fixing means.

  As shown in FIG. 6, in two adjacent magnet units 13, the polarity of the permanent magnet 23 with respect to one steel block 20 is opposite to the polarity of the permanent magnet 23 with respect to the other steel block 20. The first alnico magnet 21 is capable of reversing the polarity by magnetic induction of the magnetic field generated by the first coil 22. In two adjacent magnet units 13, the polarity of one first alnico magnet 21 and the polarity of the other first alnico magnet 21 are reversed.

Next, the operation state display mechanism 30 will be described.
As shown in FIGS. 1 to 3, the operation 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. 8, the operation state display mechanism 30 includes a steel case member 31 incorporated in the clamp plate 12, a lid member 35 made of a transparent acrylic resin plate that covers the front side of the case member 31, and A first housing hole 31 a formed in the case member 31, a columnar second alnico magnet 32 housed in the first housing hole 31 a, and a synthetic resin coil bobbin 32 a externally fitted to the second alnico magnet 32 And a second coil 33 wound around the coil bobbin 32a, and a disk-shaped permanent magnet 34 accommodated in a second accommodation hole 31b formed in the case member 31 on the inlet side of the first accommodation hole 31a. Movable display member).

  A hole portion 12d facing in the front-rear direction is formed in a portion near the lower end of the front end portion of the clamp plate 12, and a case member 31 is incorporated in the hole portion 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 accommodates the coil bobbin 32a accommodating the second alnico magnet 32 in a state where the second coil 33 is wound. The permanent magnet 34 is accommodated in the second accommodation hole 31b in a reversible manner in the second accommodation hole 31b. The lid member 35 is fixed to the clamp plate 12 with four screws 35 a in a state where the front side of the case member 31 is closed with the lid member 35.

  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. In the present embodiment, the suction state is indicated when the red display surface 34a is displayed on the front surface, and the non-adsorption state is indicated when the white display surface 34b is displayed on the front surface.

  As will be described later, the clamp plate 12 is provided with an energization circuit for energizing the second coil 33 only when energizing the plurality of first coils 22 of the plurality of magnet units 13. When the plurality of magnet units 13 of the clamp plate 12 are in the attracted state, as shown in FIG. 8, the red display surface 34a of the permanent magnet 34 is displayed outward on the front surface, so that the magnetic fixing device 10B is in the attracted state. Can be easily identified.

  Further, when the plurality of first coils 22 of the magnetic force type fixing device 10B are energized for several seconds to switch the plurality of magnet units 13 to the non-adsorption state, the second coil 33 is also energized for several seconds and the second alnico magnet 32 is energized. The polarity of the permanent magnet 34 is also reversed, and the white display surface 34b of the permanent magnet 34 is displayed outwardly on the front surface as shown in FIG. Can be easily identified. The same applies when switching from the non-adsorption state to the adsorption state.

Next, the operation control unit 15 will be described.
As shown in FIG. 10, the operation control unit 15 includes an operation panel 16, a control unit 17, a drive circuit 17 a that simultaneously drives the first and second coils 22 and 33 of the clamp plate 11, and the first of the clamp plate 12. The drive circuit 17b which drives the 1st, 2nd coils 22 and 33 simultaneously, and the male connector part 18a of the connector 18 are provided. The control unit 17 includes a computer including a CPU, a ROM, and a RAM, an input / output interface, and the like, and a necessary control program is stored in the ROM.

  The injection molding machine 1 is provided with a female connector portion 18b (common connector) of the connector 18 and an interlock panel 19 for the magnetic fixing devices 10A and 10B. The plurality of first coils 22 and one second coil 33 of the magnetic type fixing device 10A are connected to the plurality of first coils 22 and one second coil 33 of the magnetic type fixing device 10B via the connector 26. It is connected.

  The operation control unit 15 is a portable type with a caster shared by a plurality of injection molding machines 1, and each of the plurality of injection molding machines 1 is equipped with the common female connector portion 18b. When exchanging the mold M, the operation control unit 15 is moved to the vicinity of the injection molding machine 1, and the male connector unit 18a is connected to the female connector unit 18b. 10A and 10B can be operated.

  A molding machine control unit 9A and a power supply device 9B are connected to the interlock panel 19. The molding machine control unit 9A controls various mechanisms relating to injection, such as the platen drive mechanism 4, the injection mechanism 6, and the eject mechanism 7 of the injection molding machine 1. The molding machine control unit 9A includes a computer including a CPU, a ROM, and a RAM, an input / output interface, and the like, and a necessary control program is stored in the ROM.

  The molding machine control unit 9A receives a plurality of signals from a plurality of sensors and the like provided in various mechanisms related to injection molding, and securely fixes or releases the mold M based on the plurality of signals. It is determined whether or not a necessary condition is satisfied, and when the necessary condition is satisfied, an operation permission signal indicating that the magnetic fixing devices 10A and 10B can be operated is transmitted to the interlock panel 19. To the operation control unit 15. The interlock panel 19 has a power supply circuit. The AC power supplied from the power supply device 9B to the interlock panel 19 is converted into DC power by the power supply circuit, and this DC power is supplied to the operation control unit 15 via the connector 18. The drive circuits 17a and 17b are supplied to the plurality of first coils 22 and the two second coils 33 of the magnetic force type fixing devices 10A and 10B.

Next, operations and effects of the magnetic force type fixing devices 10A and 10B will be described.
When the molds M1 and M2 are fixed to the platens 2 and 3 by the magnetic fixing devices 10A and 10B, the connector 18 is first connected, and the operation control unit 15 is connected to the interlock panel 19 while the crane or the like is transported. By means, the mold M is conveyed between the platens 2 and 3. At this time, the plurality of magnet units 13 of the clamp plates 11 and 12 are brought into a non-adsorption state as shown in FIG. 7 so that no magnetic force acts on the mold M. At this time, the operation state display mechanism 30 shows a non-adsorption state with the white display surface 34b facing forward as shown in FIG.

  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, and the circular convex portion of the mold M1 is fitted to the locating ring 11c of the fixed surface 11a. To do. Next, when the molds M1 and M2 are fixed to the fixing surfaces 11a and 12a, the operation panel 16 of the operation control unit 15 is operated, power is supplied from the control unit 17, and the plurality of first coils 22 are attracted. Is applied for several seconds, the polarity of the first alnico magnet 21 is switched as shown in FIG. 6, and a magnetic circuit having the mold M as a part of the magnetic path is formed. Thus, the molds M1 and M2 are attracted and fixed to the fixing surfaces 11a and 12a.

  At this time, the second coil 33 of the clamp plates 11 and 12 is also supplied with a current for switching the polarity of the second alnico magnet 32 at the same time for several seconds, and the permanent magnet 34 is reversed as shown in FIG. The display mechanism 30 displays the red display surface 34a. Thereby, the operator can easily identify that the magnet unit 13 is in the attracted state. Thereafter, by separating the connector 18, the operation control unit 15 can be moved to another injection molding machine 1 for use.

  On the other hand, when the molds M1 and M2 are released from the fixing surfaces 11a and 12a of the clamp plates 11 and 12, the operation controller 15 is connected to the interlock panel 19 by connecting the connector 18, and the operation control is performed. Through the operation of the unit 15, a current in the opposite direction to the case where the molds M <b> 1 and M <b> 2 are fixed to the first coils 22 is applied for several seconds, and the polarity of the alnico magnet 21 is as shown in FIG. Inverted and switched to the non-adsorption state, the two second coils 33 are energized simultaneously to switch to the state shown in FIG.

  Thereby, the operator can easily identify that the magnet unit 13 is in the non-adsorption state. Thereafter, the connector 18 is divided, and the operation control unit 15 is transported to another injection molding machine 1 and used.

  As described above, since the operation state display mechanism 30 capable of displaying an index indicating whether the plurality of magnet units 13 are attracted or not attracted is provided on the outer peripheral surfaces of the clamp plates 11 and 12, the operator can Can be easily identified as an adsorption state or a non-adsorption state. In particular, since the operation control unit 15 for attaching and detaching the mold is not provided in each injection molding machine 1 and is shared by the plurality of injection molding machines 1, the magnet unit 13 can be used even when the operation control unit 15 is removed from the injection molding machine 1. The operator can easily discriminate whether or not is adsorbed or non-adsorbed.

Next, an example in which the first embodiment is partially changed will be described.
[1] When the magnetic fixing devices 10 </ b> A and 10 </ b> B are configured so that a small mold is attracted by some of the plurality of magnet units 13, the operation state display mechanism 30 causes the some of the plurality of magnet units 13. You may comprise so that may show an adsorption state or a non-adsorption state.
[2] The operation state display device 30 may be provided so as to display on the fixed surfaces 11a, 12a of the clamp plates 11, 12.

[3] Even when the clamp plates 11 and 12 are omitted and the magnetic fixing devices 10A and 10B are incorporated in the platens 2 and 3, the operation control unit 15 and the operation state display device 30 are provided in substantially the same manner as described above. be able to. In that case, the platens 2 and 3 correspond to clamp plates.
[4] The operation control unit 15 shown in FIG. 10 may be omitted, the operation panel 16 and the control unit 17 may be always connected to the interlock panel 19, and the drive circuits 17 a and 17 b may be provided on the interlock panel 19.

[5] As shown in FIG. 11, in the operation state display mechanism 30A, a cylindrical permanent magnet 36 that can be reversed in the second accommodation hole 31b is also provided as a movable display member. A red display surface 36a colored in red is formed at one end portion on the N pole side of the permanent magnet 36, and a white display surface 36b colored in white is formed on the other end portion on the S pole side of the permanent magnet 36. Yes. The red display surface 36a indicates an adsorption state, and the white display surface 36b indicates a non-adsorption state. An intermediate portion in the longitudinal direction of the permanent magnet 36 is rotatably supported by a pin member 37 and a pair of support portions 38.

[6] As shown in FIG. 12, in the operation state display mechanism 30B, a spherical permanent magnet 39 that can be reversed by the second accommodation hole 31b is provided as a movable display member. A red display portion 39a is formed on the N pole side of the permanent magnet 39, and a white display portion 39b is formed on the S pole side half. The red display surface 39a indicates an adsorption state, and the white display surface 39b indicates a non-adsorption state.

[7] As shown in FIGS. 13 and 14, in the operation state display mechanism 30 </ b> C, the case member 31 is formed with a second housing hole 31 b that opens forward, and a thick-walled lid made of a transparent acrylic resin. The member 41 is formed with a hole 41a that opens rearward. The lid member 41 is fixed to the clamp plate 12 with four screws 41b, and the second accommodation hole 31b and the hole portion 41a communicate with each other.

  As the movable display member, a cylindrical permanent magnet 40 accommodated in the second accommodation hole 31b and the hole 41a so as to be movable in the axial direction is provided. A red display portion 40a is formed at one end portion on the N pole side of the permanent magnet 40, and the other end portion on the S pole side is colored white. When the magnetic fixing devices 10A and 10B are in the non-adsorptive state, the permanent magnet 40 moves backward as shown in FIG. 13, and in the attracted state, as shown in FIG. Displayed on the front side.

[8] As shown in FIGS. 15 and 16, in the operation state display mechanism 30D, the lid member 41 has a first hole portion 41c connected to the front end of the second accommodation hole 31b, and a second hole portion 41d opened forward. Is formed. As the movable display member, a columnar permanent magnet 40 movably accommodated in the second accommodation hole 31b and the first hole portion 41c is provided, and a red indicator bar as a red display portion is provided on the front end surface of the permanent magnet 40. 42 is fixed. When the magnetic fixing devices 10A and 10B are in the attracted state, the permanent magnet 40 and the index bar 42 are retracted as shown in FIG. Further, in the non-adsorption state, as shown in FIG. 16, the permanent magnet 40 and the indicator rod 42 move forward, and the indicator rod 42 protrudes forward from the second hole portion 41d.

  Next, the magnetic type fixing devices 10A and 10B according to the second embodiment will be described. However, the same components as those in the first embodiment are denoted by the same reference numerals and description thereof is omitted. Instead of the operation state display device 30, an operation state display device 50 is provided at the same position of the clamp plates 11 and 12. The operating state display device 50 includes a display lamp 51 and a case member 52 that accommodates the display lamp 51. The display lamp 51 outputs red light when the magnetic force type fixing devices 10A and 10B are in the attracting state, and outputs green light when the magnetic force fixing devices 10A and 10B are not attracted. An operation control unit for operating and controlling the display lamp 51 is also provided.

  Next, a magnetic type fixing device 10C according to the third embodiment will be described. However, the same components as those in the first embodiment are denoted by the same reference numerals and description thereof is omitted. As shown in FIG. 18, the magnetic type fixing device 10C is mounted and fixed on a table of a machining center, for example, and adsorbs a work pallet (clamp object) to which a workpiece to be machined is fixed by a magnetic force. It is to be fixed.

  The magnetic fixing device 10 </ b> C is provided at a clamp plate 60 having a fixing surface 60 a, a plurality of magnet units 13 that are provided on the clamp plate 60 and generate an attractive force composed of magnetic force, and a front end (outer peripheral surface) of the clamp plate 60. And operating state display mechanisms 30E to 30G capable of displaying an index indicating whether the plurality of magnet units 13 are in an attracting state or a non-attracting state.

  The clamp plate 60 is a steel plate having magnetism. A connector 61 for connecting to the operation control unit is provided at the front end of the clamp plate 60. Rail grooves 60 b that engage with the guide rails on the table side are formed at both left and right ends of the clamp plate 60. The clamp plate 60 is provided with three magnet unit groups 13 </ b> A, 13 </ b> B, and 13 </ b> C arranged side by side with eight magnet units 13 as one group.

The operation state display mechanisms 30E, 30F, and 30G display the operation states of the magnet unit groups 13A, 13B, and 13C, respectively. Each of the operation state display mechanisms 30E, 30F, and 30G is the same as the operation state display mechanism 30.
In addition to the magnetic force fixing device 10C, the present invention can be applied to a magnetic force fixing device for fixing a workpiece to a work pallet. In addition, 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 gist of the present invention.

  It can be applied to various magnetic fixing devices that incorporate one or more magnetic force generation mechanisms (magnet units) for fixing dies and workpieces into the clamp plate. Since the index indicating is displayed, productivity and safety can be improved.

Claims (6)

In a magnetic fixing device having a clamp plate having a fixing surface for fixing a clamp object such as a mold and a plurality of magnetic force generating mechanisms incorporated in the clamp plate and fixing the clamp object to the fixing surface by magnetic force.
Each magnetic force generation mechanism includes a magnetic member facing the fixed surface, a plurality of permanent magnets disposed on the outer peripheral side of the magnetic member, a first alnico magnet disposed on the back side of the magnetic member, A first coil for switching the polarity of the first alnico magnet, and configured to be switchable between an adsorption state that adsorbs a clamp object and a non-adsorption state that does not adsorb the clamp object,
The fixing surface or the outer peripheral surface of the clamping plate is provided with a plurality of magnetic force generating mechanism is actuated state display mechanism capable of displaying an index indicating whether unadsorbed state or adsorption state,
The operating state display mechanism includes a second alnico magnet, a second coil wound around the second alnico magnet and electrically connected in parallel with the first coil, and a movable display member having a permanent magnet.
An energizing circuit for energizing the second coil only when energizing the plurality of first coils of the plurality of magnetic force generation mechanisms is provided . The operating state display mechanism includes a case member incorporated in the clamp plate, a transparent lid member that covers the front side of the case member,
A first accommodation hole formed in the case member for accommodating the second alnico magnet and the second coil ;
Magnetic fixing device according to claim 1, characterized in that a second accommodating hole for accommodating the movable display member formed on said case member on the inlet side than the first accommodation hole.   The said movable display member is comprised with the disk-shaped permanent magnet which can be reversed in the said 2nd accommodation hole, and the said parameter | index was marked on the end surface of this disk-shaped permanent magnet. Magnetic fixing device as described.   The movable display member is composed of a cylindrical permanent magnet that can be reversed in the second accommodation hole, and the index is marked on an end surface of the cylindrical permanent magnet, and the middle of the cylindrical permanent magnet in the longitudinal direction. The magnetic fixing device according to claim 2, further comprising a pin member that rotatably supports the portion.   The movable display member is constituted by a cylindrical permanent magnet accommodated in the second accommodation hole so as to be movable in a predetermined stroke in the axial direction, and the index is marked on an end surface of the cylindrical permanent magnet. The magnetic fixing device according to claim 2, wherein the magnetic fixing device is a magnetic fixing device. It said magnetic fixing unit, magnetic fixing device according to any one of claims 1 to 5, characterized in that it is equipped with a platen of the injection molding machine.

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