JP2010198960A - Electromagnetic relay and control device using it - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To carry out an anti-fall-off measure of a card of an electromagnetic relay, so made to transfer movement of an armature to a movable contact through the card. <P>SOLUTION: In the electromagnetic relay 1 so made to change over contact states as movable contact terminals 22, 32 get engaged with the card 8 made to displace in sliding by an armature driven by an electromagnet block 5 and get curved and deformed to come in or out of contact with fixed contact terminals 21, 31, if the armature is structured of a movable plate driven by the electromagnet block 5 for weight reduction, a permanent magnet giving it magnetic force, and a sub card 61 made of resin mold for the movable plate to be integrally mounted, as a plate-like tongue piece 65 set extended from the sub card 61 is made engaged with an engagement hole 81 of the card 8 to realize sliding displacement, the tongue piece 65 is loosely inserted into the engagement hole 81, and then, at its tip part 650, locking pawls 651, 652 are formed so as to go astride the engagement hole 81 by melting the tip part 650. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to an electromagnetic relay and a control device using the electromagnetic relay, and more particularly to the electromagnetic relay that transmits the movement of an armature to a movable contact via a card.

  An electromagnetic relay as described above is disclosed in Patent Document 1, for example. According to the prior art, as shown in FIGS. 7 and 8, the armature 102 is oscillated and displaced by the electromagnet 101, and the card 103 is engaged by the card 103 that engages the oscillating displacement with one end of the armature 102. When the movable contact 104 engaged with the other end of the card 103 contacts or separates from the fixed contact 105, the contact state is switched.

  A pair of holes 104a is formed at the tip of the movable contact 104 in preparation for an impact such as when dropped, and a protrusion 103a that fits into the hole 104a is formed inside the frame of the card 103 correspondingly. In addition, a locking piece 103b is provided for suppressing the deflection of the tip of the movable contact 104, so that the card 103 can be assembled to the movable contact 104 with a simple fit and the impact against the impact can be reduced. The card 103 is also prevented from coming off on the other end side. On the other hand, on one end side of the card 103, a protrusion 103c formed inside the frame of the card 103 is fitted into a pair of cutouts 102a formed on the front end side of the armature 102. The card 103 can be assembled to the armature 102, and the card 103 is prevented from being detached from the one end against the impact.

JP 2005-294162 A

  In the above-described prior art, the armature 102 is an iron piece, and the protrusion 103c of the card 103, which is a resin molded product, can be fitted into the notch 102a of the armature 102. However, when the armature 102 that drives the card 103 becomes heavy, there is a problem that the electromagnet 101 is also enlarged. Therefore, it is conceivable that the portion of the armature 102 that is attracted to the yoke 106 is an iron piece and the rest is a resin molded product. However, in this case, the problem is that the resin 103 is cracked in the card 103 or the armature 102, or the protrusion 102b forming the protrusion 103c or the notch 102a is scraped off during the assembly. There is.

  An object of the present invention is to generate an inconvenience even if an engagement portion between an armature and a card is formed of a resin molded product in an electromagnetic relay configured to transmit the movement of the armature to a movable contact through a card. It is an object of the present invention to provide an electromagnetic relay and a control device using the same.

  In the electromagnetic relay of the present invention, an armature is oscillated and displaced by an electromagnet, and the oscillating displacement is converted into a slide displacement of the card by a card that engages with the armature, and a movable contact that is engaged with the card. In the electromagnetic relay in which the contact state is switched by contacting or separating from the fixed contact, the armature includes a movable plate driven by the electromagnet, a permanent magnet for applying a magnetic force thereto, and a resin molded product, A sub-card to which a movable plate is integrally attached, and the sub-card is engaged with the card, and a plate-like tongue piece whose thickness direction is the sliding direction of the card is formed. An engagement hole into which the tongue piece fits is formed, and the distal end portion of the tongue piece is formed by melting the distal end portion so as to straddle the engagement hole. And having a locking pawl.

  According to the above configuration, when the movable contact is engaged with a card that is slid and displaced by the armature driven by the electromagnet, the movable contact is bent and deformed to contact or separate from the fixed contact. In the electromagnetic relay to be switched, the armature is composed of a movable plate driven by the electromagnet for weight reduction, a permanent magnet for applying magnetic force thereto, and a resin molded product, and the sub plate to which the movable plate is integrally attached. A card-like tongue piece extending from the sub-card is engaged with the engagement hole of the card to realize the sliding displacement, the tongue piece is used as the engagement hole. After the loose insertion, a locking claw is formed at the tip of the tip so as to straddle the engagement hole by melting the tip. That is, the tip of the tongue piece is formed in a hammerhead-like cross section.

  Therefore, to reduce the weight, the entire armature is not formed of metal, and even if the engagement portion with the card is formed of a resin molded product, the tip of the tongue piece is prevented from coming off, so cracks and Generation | occurrence | production of the malfunction by engagement of resin molded products, such as generation | occurrence | production of dust, can be prevented beforehand. Further, when the locking piece is prevented from coming off, there is no risk of adhesion to an undesired portion in the vicinity as occurs when the locking piece is bonded with an adhesive, and it is possible to easily take measures against the coming-off with high reliability.

  The electromagnetic relay according to the present invention is characterized in that a return spring is further engaged with the card between the armature and the movable contact.

  According to the above configuration, when there is a return spring, when the card is displaced in a direction opposite to the bias direction of the return spring, a pushing force acts on the card, and the tongue piece is easily detached from the engagement hole. Therefore, it is particularly suitable.

  Furthermore, in the electromagnetic relay of the present invention, one set of the contacts is provided in the sliding direction of the card.

  According to said structure, a movable contact consists of material which has elasticity, such as a leaf | plate spring, and the countermeasure against card removal prevention is easy.

  Therefore, for example, when a plurality of sets of contacts are provided in the card sliding direction, such as 3a1b, 2a2b, 5a1b, etc., the cards are prevented from being detached by the plurality of movable contacts and are not easily removed from the tongue piece. However, for example, when the number of contacts in the card sliding direction is one set, such as 1a and 1a1b, the retaining effect by the movable contact is small, and the above-described countermeasure against retaining by the locking claw at the tip of the tongue piece is as described above. Is particularly effective.

  Furthermore, the control device of the present invention is characterized by using the above-described electromagnetic relay having high reliability with respect to an impact or the like even when a lightweight armature is used.

  According to said structure, this control apparatus can be reduced in weight, and when using as a safety relay which requires many said electromagnetic relays especially, it is suitable.

  In the electromagnetic relay of the present invention, as described above, when the movable contact is engaged with the card that is slid and displaced by the armature driven by the electromagnet, the movable contact is bent and deformed to contact or separate from the fixed contact. In the electromagnetic relay configured to switch the contact state, the armature is composed of a movable plate driven by the electromagnet for weight reduction, a permanent magnet for applying a magnetic force thereto, and a resin molded product. In the case of being configured to include a sub-card that is integrally attached, the tongue-shaped piece is formed when the plate-like tongue extending from the sub-card is engaged with the engagement hole of the card to realize the sliding displacement. Is loosely inserted into the engaging hole, and then the engaging claw is formed at the distal end portion so as to straddle the engaging hole by melting the distal end portion.

  Therefore, for the sake of weight reduction, the entire armature is not made of metal, and even if the engagement portion with the card is made of a resin molded product, the tip of the tongue piece is melted to prevent it from coming off, so it will crack. It is possible to prevent the occurrence of problems due to the engagement of resin molded products such as generation of dust and dust. Further, when the locking piece is prevented from coming off, there is no risk of adhesion to an undesired portion in the vicinity as occurs when the locking piece is bonded with an adhesive, and it is possible to easily take measures against the coming-off with high reliability.

  Moreover, the control apparatus of this invention uses the said electromagnetic relay as mentioned above.

  Therefore, the control device can be reduced in weight, and is particularly suitable for use as a safety relay that requires a large number of the electromagnetic relays.

1 is an exploded perspective view of an electromagnetic relay according to an embodiment of the present invention. It is a perspective view which shows the assembly state of FIG. FIG. 3 is a plan view of FIG. 2. It is a longitudinal cross-sectional view for demonstrating operation | movement of the said electromagnetic relay. It is a figure which expands and shows the tongue piece and engagement hole vicinity in FIG. FIG. 4 is a cross-sectional view taken along the section line VI-VI in FIG. 3. 1 is an exploded perspective view of a typical prior art relay. FIG. 1 is a perspective view of a typical prior art relay. FIG.

  Hereinafter, the present invention will be described in detail with reference to the accompanying drawings. In the following description, the vertical direction will be described with reference to FIG. 1 is an exploded perspective view of an electromagnetic relay 1 according to an embodiment of the present invention, FIG. 2 is a perspective view showing an assembled state thereof, and FIG. 3 is a plan view of FIG. The electromagnetic relay 1 is a safety relay having a minimum contact configuration including one a (normally open: NO) contact 2 and one b (normally closed: NC) contact 3. Hereinafter, for the sake of convenience, the arrangement direction of the contacts 2 and 3 is defined as the left-right direction. The electromagnetic relay 1 generally includes a body 4, an electromagnet block 5, an armature block 6, a return spring 7, a card 8, a cover 9, and the contacts 2 and 3. .

  The body 4 is made of a molded product such as PBT having insulating properties and flame retardancy, and has a longitudinal base 41 on which one end of the electromagnet block 5 is mounted, and a pair standing upright at a substantially central portion of the base 41. Side walls 42, 43, a connecting member 44 that connects and reinforces the side walls 42, 43 to the electromagnet block 5 side, an insulating partition 45 that connects the side walls 2, 43 to the contacts 2, 3 side, and the insulating partition 45 is provided with an insulating partition wall 46 extending from the center of 45 and partitioning the contacts 2 and 3, and a terminal block 47 for holding the contacts 2 and 3 on the other end side of the base 41. The armature block 6 and the return spring 7 are accommodated in a region defined by the side walls 42 and 43 and the insulating partition wall 45, and the terminals 21 and 22; And the card 8 slides and displaces on the insulating partition wall 45.

  FIG. 4 is a longitudinal sectional view of the electromagnetic relay 1. The cover 9 is omitted. According to FIG. 4, the structures of the electromagnet block 5 and the armature block 6 are clear. According to this, the electromagnet block 5 includes a coil 51, a spool 52 around which the coil 51 is wound, an iron core 53 having a substantially L-shaped yoke 54, 55 inserted into the center hole of the spool 52, A pair of coil terminals 56 erected on a flange portion 52a on the lower side of the spool 52 are provided. Each end of the coil 51 is connected to the upper side of each coil terminal 56, and the lower side is press-fitted into the base 41 and protrudes to the outside as a terminal.

  The armature block 6 is not formed entirely of soft iron or the like, but is made of a resin-molded sub-card 61, a movable plate 62 made of soft iron or the like, and a rectangular parallelepiped permanent magnet 63 for weight reduction. It is prepared for. The movable plate 62 is formed in a rectangular flat plate shape and bonded to the sub card 61. The permanent magnet 63 is fixed to the surface of the movable plate 62. As shown in FIG. 1 and FIG. 2, a pair of pins 64 are erected on both the left and right side surfaces of the sub card 61, and these pins 64 fit into holes 48 formed in the side walls 42 and 43 of the base 41, respectively. Thus, the armature block 6 is held so as to be swingable and displaceable in the arrow 69 and the opposite direction. When the armature block 6 is attached to the base 41, the upper end portion of the movable plate 62 faces the upper yoke 54 of the electromagnet block 5 and the lower end portion faces the lower yoke 55 of the electromagnet block 5. A tongue piece 65 extends from the upper end portion of the sub card 61, and the tongue piece 65 engages with an engagement hole 81 formed in the card 8. Displacement driving in the opposite direction is possible.

  The return spring 7 is formed in a substantially Y shape as shown in FIG. 1 by punching and bending a thin metal plate having elasticity, and a lower end 71 whose rigidity is increased by folding (overlapping) is shown in FIG. As shown in FIG. 4, the base 41 is press-fitted between the armature block 6 and the insulating partition 45, and the tip portions 75 and 76 of the bifurcated upper end portions 73 and 74 are inserted into the return spring holes 83 and 84 of the card 8. Thus, the card 8 is elastically biased in the direction opposite to the arrow 82 and so as not to cause rotation in the yaw direction indicated by the arrow 85 and the opposite direction.

  The contacts 2 and 3 include a pair of fixed contact terminals 21 and 31 and movable contact terminals 22 and 32. These terminals 21, 22; 31, 32 are formed by punching a thin metal plate having elasticity and bent in a crank shape in a side view, and are movable among the bent parts 21 a, 22 a; 31 a, 32 a. The contact terminals 22 and 32 are doubled by folding the metal plate in order to increase rigidity.

  Then, on the other end side of the base 41, the bent portions 21a, 22a; 31a, 32a are press-fitted into mounting grooves 49 formed on both sides, and further fixed with an adhesive, whereby the terminals 21, 22 are inserted. The rotation of the 31 and 32 in the yaw direction 85 is suppressed, and they are implanted so as to face each other in parallel. The lower ends 21b, 22b; 31b, 32b of these terminals 21, 22; 31, 32 become relay terminals by projecting from the base 41, and the upper arms 21c, 22c; 31c, 32c having elasticity The contact members 21d, 22d; 31d, 32d are fixed by caulking.

  In order to give the fixed contact terminals 21 and 31 rigidity, ribs 21e and 31e are formed in the lower portions of the contact members 21d and 31d in the upper arm portions 21c and 22c. These contact members 21d, 22d; 31d, 32d are configured to be in contact with each other in a substantially parallel manner by generating a deflection due to the pressing of 32 at the base end portion on the base 41 side. On the other hand, in the upper arm portions 22c and 32c of the movable contact terminals 22 and 32, slits 22e and 32e are formed in the portion on the base 41 side so that they are easily bent. The slits 22e and 32e need not be provided. And in the storage space of the contacts 2 and 3 partitioned by the insulating partition wall 46, the contact members 21d and 22d; 31d and 32d that are in contact with each other are opened (separated), and the contact gap is 0.5 mm at the time of welding. In order to ensure the above, and in order to prevent a short circuit when the return spring 7 is broken, an insulating partition 40 for separation is provided upright from the base 41 between the terminals 21, 22;

  When the coil 51 is not energized, the card 8 is displaced in the direction of the electromagnet block 5, that is, in the direction opposite to the arrow 82 by the elastic force of the return spring 7. The fixed contact terminal 21 and the movable contact terminal 32, and the movable contact terminal 22 and the fixed contact terminal 31 are disposed on a line that is displaced and orthogonal to the sliding direction. In addition, on the b (normally closed: NC) contact 3 side, the fixed contact terminal 31 is arranged inward and the movable contact terminal 32 is arranged on the outside, and on the contrary, on the a (normally open: NO) contact 2 side, it is movable. The contact terminal 22 is disposed inward and the fixed contact terminal 21 is disposed outward, and the distal ends of the upper arm portions 22c and 32c of the movable contact terminals 22 and 32 are engaged with the engagement holes 86 and 87 of the card 8. Tongue pieces 22f and 32f.

  The card 8 is generally formed of a resin molded product formed in a U-shape, and the engagement hole 81 and the pair of left and right return spring holes 83 and 84 for the sub card 61 are U-shaped connecting portions. 80, a pair of left and right engaging holes 86, 87 are formed on the U-shaped arm portions 88, 89 side. As described above, the card 8 is mounted and supported by the tongue piece 65 of the sub card 61, the tip portions 75 and 76 of the return spring 7, and the tongue pieces 22f and 32f of the movable contact terminals 22 and 32. And the height of the upper end surface 45a of the insulating partition 45 is a droop formed from the inner facing surfaces 88c, 89c of the arm portions 88, 89 so as not to come into contact with the back surfaces on the base end side of the arm portions 88, 89. The height of the step surface 46a formed on the upper end side of the insulating partition wall 46 is set so as not to contact the lower end surfaces 88b and 89b of the pieces 88a and 89a.

  Further, the following two points are performed as the guide for the slide displacement. First, the upper end portion 46b of the insulating partition wall 46 is sandwiched between the hanging pieces 88a and 89a, and is formed by hanging from the top plate 91 of the cover 9 between the inner facing surfaces 88c and 89c of the arm portions 88 and 89. The guide 91a is sandwiched. Next, the lower end surface 91b of the guide 91a fits into stepped portions 88d and 89d generated by forming the hanging pieces 88a and 89a on the inner facing surfaces 88c and 89c of the arm portions 88 and 89, respectively.

  The cover 9 is made of a resin molded product such as transparent polycarbonate, and is formed in a box shape with an open bottom so that the open / close state of the contact members 21d, 22d; 31d, 32d can be confirmed, and is shown in FIG. The parts are put on the body 4 in an assembled state from above, and the inner peripheral surface at the lower end is bonded to the base 41.

  In the electromagnetic relay 1 configured as described above, when the coil 51 is in a non-energized state, as shown in FIGS. 2, 3, and 4 (a), the contact force is generated by the elastic force of the return spring 7 through the card 8. The pole block 6 is biased in the direction of the arrow 69, whereby the card 8 is slid in the direction opposite to the direction of the arrow 82, that is, the electromagnet block 5, and the movable contact terminal that is hooked by the card 8. 22 and 32 are also bent and deformed in the direction opposite to the direction of the arrow 82, that is, the electromagnet block 5 side. As a result, the b (NC) contact 3 side is conducted and the a (NO) contact 2 side is shut off.

  In contrast, in the energized state of the coil 51, the armature block 6 is opposite to the direction of the arrow 69 against the elastic force of the return spring 7 via the card 8, as shown in FIG. The card 8 is slid in the direction of the arrow 82, that is, opposite to the electromagnet block 5, and the movable contact terminals 22 and 32 hooked by the card 8 are also in the direction of the arrow 82. That is, it is bent and deformed on the side opposite to the electromagnet block 5. As a result, the b (NC) contact 3 side is cut off and the a (NO) contact 2 side is conducted.

  It should be noted that in the electromagnetic relay 1 of the present embodiment, the permanent magnet 63 and the movable plate 62 are mounted on the armature block 6 to reduce the weight as described above, and the sub card 61 is made of a resin molded product. When the plate-like tongue piece 65 extending from the sub card 61 is engaged with the engagement hole 81 of the card 8 to realize the sliding displacement, the tongue piece 65 is moved into the engagement hole 81. 2, 3, 5, and 6, the engaging claw 651 is formed so as to straddle the engaging hole by melting the distal end portion 650 at the distal end portion 650. , 652 is formed. That is, as shown in FIG. 6, the tip 650 of the tongue piece 65 is formed in a hammerhead-like cross section. 5 is an enlarged view showing the vicinity of the tongue piece 65 and the engagement hole 81 in FIG. 3, and FIG. 6 is a cross-sectional view taken along the section line VI-VI in FIG.

  On the other hand, in correspondence with this, in FIG. 3, symmetrically with respect to the center line 8 x of the card 8, as shown by oblique lines, in the vicinity of the corner of the engagement hole 81, Protrusions 81a, 81b; 81c, 81d are formed in contact with the thickness direction. The rear surfaces of the projections 81a, 81b; 81c, 81d are formed on an inclined surface 81e that allows the tongue piece 65 to swing.

  By configuring in this way, the entire armature block 6 is not formed of metal for weight reduction as described above, and even if the engaging portion with the card 8 is formed of the tongue piece 65 of a resin molded product, Similarly, the melted portions of the tip 650 of the tongue 65 made of a resin molded product become the locking claws 651 and 652, and the claw portions 651a and 651b; 652a and 652b are formed in the engagement holes 81, respectively. Since the protrusions 81a, 81b; 81c, 81d are locked to prevent the protrusions from being generated, it is possible to prevent the occurrence of problems due to the engagement between resin molded products such as cracks and dust. In addition, the retaining claws 651 and 652 can be easily and highly reliable with a soldering iron or the like without any risk of adhesion to an undesired portion in the vicinity as occurs when the retaining pieces are adhered with an adhesive. Can be formed.

  Note that the leaf spring-like movable contact terminals 22 and 32 have tongue pieces 22f and 32f that fit into the locking holes 86 and 87 of the card 8, as shown in FIG. Protrusions 86 a, 86 b, 86 c; 87 a, 87 b, 87 c are formed in the stop holes 86, 87, and are prevented from coming off. For example, as in 3 a 1 b, 5 a 1 b, etc. When a set of contact points is provided, it is difficult to drop off the tongue piece 65 by retaining the plurality of movable contact points. However, when the number of contacts in the sliding direction 82 of the card 8 is one set as in 1a1b of the present embodiment, the effect of preventing the removal by the movable contact terminals 22 and 32 is small, and the tongue piece 65 as described above is not provided. Measures for preventing the tip 650 from coming off by the locking claws 651 and 652 are particularly effective.

  Further, as in the present embodiment, if the card 8 is further provided with a return spring 7 between the armature block 6 and the movable contact terminals 22 and 32, the bias of the return spring 7 is provided. When the card 8 is displaced in the direction opposite to the direction, that is, in the direction opposite to the arrow 82, a pushing force is applied to the card 8, and the tongue piece 65 is easily detached from the engagement hole 81. It is.

  By using such an electromagnetic relay 1 for a control device that controls a machine tool, a line, etc., the control device can be reduced in weight, and particularly suitable for use as a safety relay that requires a large number of the electromagnetic relays 1. It is.

DESCRIPTION OF SYMBOLS 1 Electromagnetic relay 2 a (normally open: NO) contact 3 b (normally closed: NC) contact 21, 31 Fixed contact terminal 22, 32 Movable contact terminal 21c, 22c; 31c, 32c Upper arm part 21d, 22d; 31d, 32d Contact Members 21e, 31e Ribs 22e, 32e Slit 4 Body 40, 45, 46 Insulating partition 41 Base 47 Terminal block 5 Electromagnet block 51 Coil 52 Spool 53 Iron core 54, 55 Yoke 6 Armature block 61 Sub card 62 Movable plate 63 Permanent magnet 65 Tongue piece 650 Tip portion 651, 652 Claw 651a, 651b; 652a, 652b Claw portion 7 Return spring 8 Card 80 Connection portion 81 Engagement hole 81a, 81b; 81c, 81d Protrusion 81e Inclined surface 83, 84 Return spring hole 86 , 87 Locking holes 88, 89 Arms 88a, 89a Hanging piece 9 Cover 91 Top plate 91 a Guide

Claims (4)

The armature is oscillated and displaced by the electromagnet, and the oscillating displacement is converted into a slide displacement of the card by the card engaged with the armature, and the movable contact engaged with the card contacts or separates from the fixed contact. In an electromagnetic relay that switches the contact state by
The armature includes a movable plate driven by the electromagnet and a permanent magnet for applying a magnetic force to the movable plate, and a sub card to which the movable plate is integrally attached. A plate-like tongue piece is formed which engages with the card and has a sliding direction of the card as a thickness direction,
The card is formed of a resin molded product, and an engagement hole into which the tongue piece is fitted is formed.
The electromagnetic relay according to claim 1, further comprising an engaging claw formed by melting the tip so as to straddle the engaging hole at the tip of the tongue.   2. The electromagnetic relay according to claim 1, wherein a return spring is further engaged with the card between the armature and the movable contact.   3. The electromagnetic relay according to claim 1, wherein one set of the contacts is provided in a sliding direction of the card.   The control apparatus using the electromagnetic relay of any one of the said Claims 1-3.

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