JPH0145045Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Technical Field to Which the Invention Pertains] The present invention relates to an electromagnetic contactor with an operation holding device that includes an auxiliary contact operated by a tripping electromagnet device. An electromagnetic contactor normally energizes an electromagnetic device,
It is configured to operate the opening/closing contact part, but in order to maintain the operated opening/closing contact part,
Conventionally, many methods have been used in which the input electromagnet device is constantly energized. However, in an electromagnetic contactor that maintains the switching contact part in an operating state for a long time, the switching contact part is locked using a mechanical latch at the same time as the switching contact part operates, thereby maintaining the operating state of the switching contact part. There are cases where it is desired to save power by stopping the energization of the closing electromagnetic device, and many conventional always-on type electromagnetic contactors have an operation holding device added to them. Furthermore, an electromagnetic contactor whose operation is maintained by a mechanical latch naturally requires a tripping electromagnet device to release the operating state of the opening/closing contact portion. [Prior art and its problems] When an electromagnetic contactor operation holding device is added to a normal constantly energized electromagnetic contactor, it is attached to the outer wall of a case housing the electromagnetic contactor to connect both mechanisms. However, this method makes the electromagnetic contactor larger than its original size, which requires a larger space and also causes various problems, so it is better to have a structure in which they are assembled in the same case. An example of a conventional electromagnetic contactor having such a structure is shown in FIGS. 1 and 2. In FIG. 1, an operation holding device 2 is built into a case 1 that houses an electromagnetic contactor. In the closing electromagnet device 3 , a movable core 6, which is attracted to and released from a fixed core 5 inside a coil 4 and moves up and down, is attached to a support member 7 via a pin 8. The opening/closing contact part 10 is constructed by inserting a movable contact base 12 and a contact spring 13 into a window 11a provided in a movable contact base support 11 that is movable up and down, and a movable contact (not shown) attached to both ends of the movable contact base 12. It is made to protrude on both sides of the window 11a. In addition, the fixed contact base 14 to which a fixed contact (not shown) facing this movable contact is attached is connected to the case 1.
is fixed. The closing electromagnet device 3 and the opening/closing contact portion 10 are housed side by side in the case 1, and a seesaw lever 16 whose substantially central portion is pivotally supported by a lever pin 15 at the bottom thereof is supported by a torsion coil type return spring 17 wound around the pin 15. It is installed so that it is biased clockwise. One end of the seesaw lever 16 is connected to the support member 7 via a pin 18, and the other end is connected to the movable contact stand support 11 via a pin 19. In this way, the attracting/releasing operation of the closing electromagnet device 3 is transmitted to the opening/closing contact section 10 via the seesaw lever 16, thereby opening/closing the opening/closing contact section 10 . In order to attach the operation holding device 2 to such an electromagnetic contactor, the opening/closing contact portion 10 side of the seesaw lever 16 is extended, and a roller 21 is attached to the tip thereof via a roller pin 20. As shown in FIG .
is rotatably attached by pin 23 to
It is biased by a torsion coil spring 24 attached to 3 to rotate clockwise. As shown in FIG. 3, the latch piece 22 is provided with a wedge-shaped roller engaging portion 22a, and adjacent sides thereof form an engaging surface 22b and a locking surface 22c. When the electromagnetic contactor is not turned on, the roller 21 is engaged with this roller engagement surface 22b.
Reference numeral 22d designates an arm of the latch piece 22, which faces the lower end surface of a tripping rod 28, which will be described later. Also,
The latch piece 22 is provided with a deep groove 22e in a direction perpendicular to the pin 23 on its lower end surface, and semicircular engagement protrusions 22f are provided on both outer ends of the groove 22e. The tripping electromagnet device 25 includes an arm 26a that attaches the latch piece 22 to a frame 26 surrounding the coil.
The plunger-shaped movable core 27, which has a mounting portion 26b for fixing the device 25 itself to the case 1 and which passes through the groove 22e of the latch piece 22, is attached to the coil hole 2.
It is inserted in 6c. The head 27a of the movable iron core 27 is assembled so as to be slidably engaged with the engagement protrusion 22f of the latch piece 22. The tripping rod 28 is supported by the case 1 so as to be slidable in its length direction, a head 28a projects outward from the case 1, a lower end 28b faces the arm 22d of the latch piece 22, and the spring receiver 28c and the auxiliary A spring 29 is inserted between the contact 30 and the movable contact 31. This movable contact 31 comes into contact with and separates from an auxiliary fixed contact (not shown) fixed to the case 1. Next, the operation of the electromagnetic contactor equipped with the operation holding device 2 configured as described above will be described. When the coil 4 is energized in the open state of the contacts of the electromagnetic contactor as shown in FIG. 1, the movable iron core 6 is attracted to the fixed iron core 5, and the seesaw lever 16 rotates counterclockwise. As a result, the movable contact base 12 is lowered together with the movable contact base support 11, and the movable contact comes into contact with the fixed contact of the fixed contact base 14 to close this electromagnetic contactor. At this time, the roller 21 provided at the tip of the seesaw lever 16 descends from the state shown in FIG. Release piece 22. Then, the latch piece 22 is rotated to the position shown in FIG. Latch to stop. Moreover, when the tripping rod 28 is pushed up, the auxiliary contact 30 operates, and the movable contact that was in contact with the fixed contact opens. By opening this auxiliary contact 30 , the excitation current of the coil 4 of the closing electromagnet device 3 is cut off. Even if the excitation current of the coil 4 is cut off and the movable iron core 6 attempts to return to the release position, the seesaw lever 1
Since the roller 21 of 6 is locked by the locking surface 22c of the latch piece 22, the seesaw lever 16
The opening/closing contact portion 10 cannot be rotated clockwise and returned to its original state, and the operating state of the opening/closing contact portion 10 is maintained. To release this operation holding state, when the tripping electromagnet device 25 is energized, its coil attracts the movable core 27, and the head 27a, which has engaged with the engagement protrusion 22f of the latch piece 22, moves to the latch piece 22. Rotate counterclockwise. Then, the roller 21 disengages from the locking surface 22c of the latch piece 22 and becomes able to slide on the engaging surface 22b, the mechanical latch of the seesaw lever 16 is released, and the seesaw lever 16 is released by the bias of the return spring 17. By rotating clockwise, the electromagnetic contactor returns to the open state shown in FIG. Of course, when the electromagnetic contactor returns to the open state, the auxiliary contact 30 closes and prepares for the next operation. Note that the operating state of the electromagnetic contactor can be released by pushing down the head 28a of the pull-out rod 28 protruding from the case 1, thereby releasing the arm 22d of the latch piece 22.
This can also be done by pressing and rotating the latch piece 22 to disengage the roller 21 from the locking surface 22c to release the mechanical latch of the seesaw lever 16, thereby releasing the operating state of the electromagnetic contactor. . When opening and closing an electromagnetic contactor with an operation holding device like this, as mentioned at the beginning, electromagnetic devices for both closing and tripping operations are used, and this tripping electromagnet device is used to open and close the contactor. An auxiliary contact to be operated is installed. This auxiliary contact is operated by a trip rod as shown in FIG. There is also an example in which it is operated by a movable core of a tripping electromagnet device. In such conventional devices, at least the fixed contact of the auxiliary contact is attached to the case, and only the movable contact or its operating arm is attached to the trip rod or movable iron core, so when assembling these components, it is necessary to adjust their relative positions. However, since each part is assembled separately, it is very difficult to manage each part, which is a drawback. [Purpose of the invention] The purpose of the invention is to assist in energizing the tripping electromagnet device that unlocks the operation holding device and the closing electromagnet device that closes the opening/closing contact portion after the opening operation of the opening/closing contact portion. To provide an electromagnetic contactor with an operation holding device which is easy to assemble and adjust with a contact point and requires no effort in parts management. [Main points of the invention] The present invention includes an opening/closing contact part, a closing electromagnet device for closing the opening/closing contact part, and a latch piece that closes the opening/closing contact part when the opening/closing contact part is closed by closing the closing electromagnetic device. a locking motion retaining device;
and an auxiliary contact that cuts off current to the closing electromagnet device by the latching operation of the latch piece of the operation holding device, and the latch piece and the auxiliary contact are integrally attached to the frame of the tripping electromagnet device. , a movable contact of the auxiliary contact is operated by the latch piece, and the auxiliary contact is configured to cut off the current to the closing electromagnet device when the latch piece engages with the latch, and a tripping electromagnet device; The latch piece and the auxiliary contact are integrated into a unit, and an operation holding device having an auxiliary contact that energizes the closing electromagnetic device that closes the opening/closing contact part and disconnects the opening/closing contact part after the closing operation is made into a unit. The electromagnetic contactor can be assembled by simply attaching an easily adjustable operation holding device unit to the electromagnetic contactor. [Embodiment of the invention] An embodiment of the invention will be described in detail below with reference to FIGS. 4 and 5. In FIG. 4, the support member of the closing electromagnet device, the movable contact stand support of the opening/closing contact part, the tripping rod, etc. are exactly the same as those of the conventional ones shown in FIGS. 1 and 2, so this figure I will omit the explanation and use the seesaw lever to represent it. The auxiliary contact 30 is connected to the frame 26 of the tripping electromagnet device 25 .
A fixed contact 32 fixed to the frame 26 and a movable contact 31 slidable in the moving direction of the movable core 27 are mounted in the frame 26 facing each other. It is being 33 is a return spring for the movable contact 31. The latch piece 22 of the operation holding device includes a roller engaging portion 22a and an arm 22 that have the same functions as the conventional ones.
d, a groove 22e, and a semicircular engagement protrusion 22f, and contact driving legs 22h are provided on both sides of the groove 22e. In this embodiment, the tripping electromagnet device 25 has a projection 26 on its frame 26.
d, and as shown in FIG. 6, the electromagnet 25a can be attached and detached by utilizing the elasticity of the frame 26. Such a tripping electromagnet device 25 and latch piece 2
2 means the auxiliary contact 30 as shown in FIG. 5A and B.
The latch piece 22 is attached to the upper side, and the movable iron core 27 is inserted into the groove 22e, so that the two parts are assembled together. In the state shown in FIG. 5A, where the tripping electromagnet device 25 once attracts the movable iron core 27 and rotates the latch piece 22 counterclockwise, the movable contact 31 is pressed against the leg 22h of the latch piece 22 and fixed. in contact with the contact point 32;
Auxiliary contact 30 is closed. At this time, the roller 21 of the seesaw lever 16 engages with the engagement surface 22b of the latch piece 22, so it can rotate like the conventional device, and the opening/closing contact portion of the electromagnetic contactor is biased by the spring 17. It's open. When the closing electromagnet device 3 is energized, the seesaw lever 16 rotates counterclockwise about the pin 15 to close the opening/closing contact portion of the electromagnetic contactor. As a result, when the roller 21 is disengaged from the engagement surface 22b, the latch piece 22 is rotated clockwise by the bias of the spring 24, as shown in FIG. 5B, and moves the roller 21 to the engagement surface 22c.
The seesaw lever 16 is locked to maintain the operation of the electromagnetic contactor. Further, the leg 22h of the latch piece 22 releases the pressure on the movable contact 31, and the movable contact 31 opens the auxiliary contact 30 by the bias of the return spring 33, thereby releasing the closing electromagnet device 3 . The release of this mechanical latch is the same as that of the conventional device, so a description thereof will be omitted. In this way, the auxiliary contact 3 of this embodiment
0 is assembled integrally with a tripping electromagnet device and a latch piece, and is opened and closed by the operation of the latch piece. In this embodiment, the auxiliary contact 30 is of a normally closed type for the operation of the electromagnetic contactor, but it can be of a normally open type or a plurality of auxiliary contacts. [Effects of the invention] As explained above, according to the invention, the auxiliary contacts and the operation holding device, which are energized by the closing electromagnet device that closes the opening/closing contact portion, are disconnected after the closing operation of the opening/closing contact portion. By detaching the latch piece and integrally attaching it to the frame of the electromagnet device to form a unit, it is possible to easily assemble and adjust the auxiliary contact as a self-demagnetizing contact of the closing electromagnet device, and the auxiliary contact can be moved. The contact is operated by the latch piece of the operation holding device, and the auxiliary contact is configured to cut off the current to the closing electromagnet device when the latch piece engages with the latch, so that the opening/closing contact part can be operated to close. When the auxiliary contact is operated after the latching engagement of the latch piece that locks the closing operation state is completed, the energization to the closing electromagnetic device is interrupted.
That is, after confirming the latch engagement of the latch piece, the power supply to the closing electromagnetic device is immediately cut off, so there is an advantage that the operational reliability of the electromagnetic contactor with the operation holding device is improved.

[Brief explanation of the drawing]

Fig. 1 is a vertical sectional view showing an example of a conventional electromagnetic contactor with an operation holding device, Fig. 2 is an exploded perspective view mainly showing the operation holding device shown in Fig. 1, and Fig. 3 is the latch piece shown in Fig. 1. FIG. 3A is an explanatory diagram showing the operation of the electromagnetic contactor according to the present invention, and FIG. FIG. 5 is an explanatory diagram showing the operation of the auxiliary contact shown in FIG. 4. A in FIG. 5 shows the latch piece in the unlocked state, and B in FIG. 5 shows the latch piece in the locked state. Each shown is a side view, and FIG. 6 is an exploded view of the tripping electromagnet device. 2 ... Operation holding device, 3 ... Closing electromagnet device,
10... Opening/closing contact part, 22... Latch piece, 25 ...
...Tripping electromagnet device, 30 ...Auxiliary contact, 31...
...Movable contact of auxiliary contact.

Claims (1)

[Scope of utility model registration request] An opening/closing contact part, a closing electromagnet device for closing the opening/closing contact part, an operation holding device for locking the opening/closing contact part with a latch piece when the opening/closing contact part is closed by the closing of the closing electromagnet device; A tripping electromagnet device for unlocking the operation holding device; and an auxiliary contact for cutting off the energization to the closing electromagnet device by the latch operation of the latch piece of the operation holding device; The auxiliary contact is integrally attached to the frame of the tripping electromagnet device, the movable contact of the auxiliary contact is operated by the latch piece, and the auxiliary contact energizes the closing electromagnet device when the latch piece is latched. 1. An electromagnetic contactor with an operation holding device, characterized in that the contactor has an operation holding device.