JPS647555Y2 - - Google Patents

Description

[Detailed Description of the Invention] This invention relates to an electromagnetic contactor with a latch that mechanically holds the electromagnetic contactor by a latch mechanism.

In general, in electromagnetic contactors with a latch, abrasion powder generated by the opening and closing operations or dust entering from the outside may adhere to the engagement surface of the mechanical holding part, increasing frictional resistance and making it impossible to release the contactor. The object of this invention is to prevent abrasion powder or dust from accumulating on a mechanical holding part and to provide a highly reliable magnetic contactor with a latch.

For convenience of explanation, the structure of the electromagnetic contactor according to this invention will be explained using FIGS. 1 to 3.

In the figure, 1 is a movable contact, 2 is a movable contact 1
3 is a movable core fixed to the crossbar 2 via a movable core pin 4; 5 is a pair of levers provided with a hole through which the movable core pin 4 passes; A connecting plate 6 is provided on both sides and is rotatably attached to one end of the connecting plate 6 with a screw 7, and this connecting plate 6 is rotatably held by a shaft 9 supported by a base 8 of the main body. Reference numeral 10 denotes a latch receiver which is rotatably attached to the other end of the lever 5 with a screw 11, and this latch receiver 10 has a latch 1 which will be described later.
A hook 58 is provided to engage with the latch base 12, and the hook 58 is slidably engaged with the groove 13 provided in the latch base 12 by protrusions (not shown) protruding from both sides of the hook 58. . The latch base 12 is fixed to the latch mounting plate 14 with screws 15,
The latch mounting plate 14 is secured to the rail plate 16 with screws (not shown), and the rail plate 16 is further secured to the rail plate 16 with screws 17.
As a result, the latch base 12 is fixed to the base 8. 18 is a latch rotatably attached to the latch base 12 by a shaft 19; 20 is a groove provided in the latch 18; 21 is a shaft portion 22 of the groove 20;
a tripping movable core into which is inserted, 23 a tripping coil that drives the tripping movable core 21;
24 is a yoke plate provided on the outer periphery of the tripping coil 23, and 25 is a tripping spring, which is provided between the yoke plate 24 and the tripping core 21 to drive the tripping core 21. Note that a magnetic path is formed between the latch mounting plate 14, the trip iron core 21, and the yoke plate 24. Further, 26 is a fixed core that faces the movable core 3, 27 is a closing coil that is housed in a coil case 28 and is wound around the fixed core 26.
It is fixed to the rail plate 16 together with the fixed iron core 26 and the coil case 28. 29 is the closing coil 27
30 is an operating plate that opens and closes the self-demagnetizing switch 29. One end is inserted into the groove 31 formed in the latch base 12, and the other end is inserted into the auxiliary crossbar 32 of the self-demagnetizing switch 29. is in contact with. A shaft 35 connected to the latch 18 is inserted into a hole 34 provided in the central bent portion 33, so that the actuating plate 30 is rotatably held relative to the latch base 12.

The self-demagnetizing switch 29 is fixed to the latch base 12 with a screw 36 and is constructed as follows. 37 is a switch base constituting the self-demagnetizing switch 29; 38 is fixed to the switch base 37; four relay terminals connect external wires to the closing coil 27 and the tripping coil 23; 39 is also fixed to the switch base 37; 40 is a movable contact facing the fixed contact 39; 41 is a push spring that biases the movable contact 40;
The movable contact 40 and the push spring 41 are held in a square hole 42 formed in the auxiliary crossbar 32.
Reference numeral 43 denotes a trip spring that biases the auxiliary cross bar 32, and the auxiliary cross bar 32 is connected to the switch base 3.
7 to perform a predetermined sliding movement. 44 is a switch cover that is fixed to the switch base 37 and covers the upper part of the switch base 37; 45 is a push rod that is attached to the switch cover 44 and manually releases the latch mechanism;
4 through the holes 46 and 47 provided in the latch 1.
It faces a protrusion 48 formed at the end of 8.
49 is a trip spring that urges the push rod 45;
0 is a retaining ring attached to the tip of the push rod 45. Further, 51 is a spacer inserted between the latch base 12 and the latch mounting plate 14, and by increasing or decreasing the spacer 51, the vertical position of the latch base 12 with respect to the latch mounting plate 14 is adjusted. Also, R is the gap between the yoke plate 24 and the tripping core 21, and the distance between the tripping core 21 and the yoke plate 24 is
This is to adjust the horizontal position of. Reference numeral 61 denotes a discharge groove having an appropriate slope formed over almost the entire length of the hook portion 58 of the latch receiver 10. Reference numeral 62 denotes a discharge hole communicating with this discharge groove 61. A plurality of them are provided at appropriate intervals in the overall length direction.

The electromagnetic contactor according to this invention is configured as described above, and the electrical connection configuration will be explained in the fourth section.
This will be explained using figures.

The closing coil 27 is connected in series with the contact portion 52 of the self-demagnetizing switch 29, and when the electromagnetic contactor is mechanically held, the contact portion 52 opens and is demagnetized. The tripping coil 23 is also connected in series with a normally open contact 55 of an auxiliary contact 54 operating in parallel with the main contact portion 53 so that it opens and is demagnetized when the mechanical retention of the magnetic contactor is tripped. It is configured.

Next, the operation of the electromagnetic contactor with the above configuration will be explained. FIG. 1 shows the open state after the latch mechanism has been released, and FIG. 3 shows the held state held by the latch mechanism.

For convenience of explanation, the operation of changing from the open state to the holding state will be referred to as the closing operation, and the operation of changing from the holding state to the open state will be referred to as the tripping operation, and the closing operation will be explained first.

In FIG. 1, when the closing coil 27 is excited, the movable iron core 3 is attracted to the fixed iron core 26 and moves in the direction of arrow A. One end of the lever 5 and the connecting plate 6 rotate in the direction of arrow B about the screw 7, and the other end of the lever 5 and the latch receiver 10 move in the direction of arrow C. The movable core 3 is attracted to the fixed core 26, and the corner 56 of the latch receiver 10 is attached to the corner 57 of the latch 18.
When the latch 18 is released, the latch 18 moves in the direction of arrow D centering on the shaft 19, and the tip end 59 of the latch 18 enters the hook portion 58 of the latch receiver 10. The movement of the latch 18 is caused by tripping via the tripping iron core 21. This is done by the biasing force of the trip spring 43 via the spring 25, the actuating plate 30, and the auxiliary crossbar 32.

The shaft 35 connected to the latch 18 rotates about the shaft 19 in the direction of the arrow D in the same way as the latch 18, and the actuating plate 30 connected to the shaft 35 rotates about the groove 13 of the latch base 12 in the direction of the arrow E. do. When the tip of the actuating plate 30 rotates in the direction of arrow E, the auxiliary crossbar 32 biased by the tripping spring 43 moves in the direction of arrow E, and the movable contact 40 separates from the fixed contact 39. Contact part 5
2 opens, the closing coil 27 is demagnetized and the movable iron core 3 separates from the fixed iron core 26 and moves in the direction opposite to the direction of arrow A. As the movable iron core 3 moves, the latch receiver 10 moves in the direction opposite to the direction of arrow C. As shown in FIG.
8 and one side 59 of the latch 18 come into contact and the latch receiver 10 is locked by the latch 18, so the crossbar 2 is mechanically held and the closing operation is completed.

Next, the tripping operation will be explained.

In FIG. 3, when the trip coil 23 connected in series with the normally open contact 55 in the closed circuit state is excited, the trip core 21 is attracted to the yoke plate 24 and moves in the direction of arrow F. tripping iron core 2
The latch 18 connected to the latch 1 rotates in the direction of arrow G, and the latch 18 is disengaged from the latch receiver 10 to release the engagement. When the engagement is released, the latch receiver 10 moves in the direction of arrow H, the lever 5 moves in the direction of arrows H and J, the connecting plate 6 moves in the direction of arrow J, the movable core 3 moves in the direction of arrow K, and the crossbar 2 moves in the direction of arrow K. They each move in the K direction and return to the open state shown in FIG. crossbar 2
During this movement, the normally open contact 55 is opened to demagnetize the tripping coil 23, and due to the movement of the latch 18, the actuating plate 30 and the auxiliary crossbar 32 are moved in the direction of arrow L to close the contact portion 52. Return to

Next, a case where the closing operation and the tripping operation are performed manually will be described.

In Figure 1, the manual closing operation is performed using the crossbar 2.
This can be done by pressing the tip 60 of the crossbar 2 with a screwdriver or the like and pushing the crossbar 2 in the direction of arrow M. In addition, the manual tripping operation is performed by pushing the push rod 45 in the direction of arrow N with a screwdriver or the like in FIG. The tripping operation is performed as described above.

The electromagnetic contactor according to the embodiment of this invention is constructed and operates as described above.Next, the purpose of this invention, which is to prevent abrasion powder or dust from accumulating on the mechanical holding portion, will be explained.

The main body of the magnetic contactor with a latch is generally mounted on a vertical panel surface, and is opened and closed in a position where gravity acts in the direction of arrow D in FIG.

For this reason, as is clear from Figures 1 and 3,
Abrasion powder generated by opening and closing operations or dust entering from the outside tends to accumulate at the tip of the latch receiver 10, and the dust is likely to accumulate on the hook portion 58 of the latch receiver 10 and the tip portion 59 of the latch 18, which are the engagement surfaces during opening and closing of the main body. However, the electromagnetic contactor according to this invention has a drain groove 61 in the hook portion 58 of the latch receiver 10 and a drain communicating with the groove 61. By providing the holes 62, abrasion particles or dust particles are allowed to pass downward, thereby preventing the dust particles from coming into pressure contact with the engagement surface.

As explained above, this invention consists of a fixed core, a movable core disposed opposite to the fixed core,
a latch receiver having a hook rotatably attached to one end of the lever; a latch base that slidably engages with the latch receiver and guides movement of the latch receiver in a linear direction caused by rotation of the lever; The latch receiver is rotatably attached to the latch base and includes a latch whose one end engages with the hook portion of the latch receiver, and dust such as abrasion particles generated by engagement with the latch falls and accumulates thereon. The hook part is formed with a discharge groove for discharging the above-mentioned dust and a discharge hole communicating with this discharge groove, so that the abrasion powder generated by the opening/closing operation of the magnetic contactor with a latch or the dust entering from the outside can be mechanically retained. There is no adhesion to the engaging surfaces of the parts, making it possible to provide a highly reliable electromagnetic contactor with a latch.

[Brief explanation of the drawing]

Fig. 1 is a diagram showing an open state of an electromagnetic contactor with a latch which is an embodiment of this invention, Fig. 2 is a sectional view taken along the line - - of Fig. 1, and Fig. 3 is a diagram showing an electromagnetic contactor with a latch which is an embodiment of this invention. FIG. 4 is an electrical connection diagram of an electromagnetic contactor with a latch, which is an embodiment of this invention. In the figure, 3 is a movable core, 5 is a lever, 10 is a latch receiver, 12 is a latch base, 13 is a groove, 14 is a latch mounting plate, 18 is a latch, 21 is a tripping core, 23 is a tripping coil, and 26 is a fixed core. ,
61 is a discharge groove, and 62 is a discharge hole. Note that the same reference numerals in the figures indicate the same or equivalent parts.

Claims (1)

[Scope of utility model registration request] A fixed core, a movable core disposed opposite to the fixed core, a lever rotatably attached to the movable core, a latch receiver having a hook rotatably attached to one end of the lever, and the latch receiver. a latch base that is slidably engaged with the latch base and guides movement of the latch receiver in a predetermined direction caused by rotation of the lever; a latch that is rotatably attached to the latch base and has one end that engages with a hook portion of the latch receiver; A discharge groove for discharging the dust and a discharge hole communicating with the discharge groove are formed in the hook portion of the latch receiver where dust such as abrasion powder generated by engagement with the latch falls and accumulates. An electromagnetic contactor with a latch featuring the following.