JP7319458B2 - Electromagnetic brake device - Google Patents

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an electromagnetic brake device used in an elevator hoist or the like.

In the electromagnetic brake device used in the hoisting machine of an elevator, etc., the armature supporting the brake shoe is pressed by the biasing force of the braking spring, and the brake shoe is brought into contact with the drum of the hoisting machine at the time of braking to obtain braking force. . When released, the armature is electromagnetically attracted against the urging force of the brake spring to separate the brake shoe from the drum of the hoist.

In such an electromagnetic brake device, when the brake shoe is shifted from the released state to the braking state, the electromagnetic attraction force is released and the armature is pressed by the biasing force of the braking spring. The brake shoe hits the drum. Therefore, a collision sound is generated as the electromagnetic attractive force is released.

As a technique for reducing the collision noise, for example, Patent Document 1 has been proposed. In Patent Document 1, a laminated compression rubber is provided for obtaining a reaction force against the biasing force of a braking spring by being compressed when an amateur moves in the braking direction.

JP 2016-90018 A

However, in the technique described in Patent Document 1, since laminated compression rubber is used to reduce the collision noise, there is a problem that the effect of reducing the collision noise deteriorates with aging. Further, in the technique described in Patent Document 1, even during braking (during braking operation), the armature is pushed back in the direction opposite to the braking direction by the reaction force of the laminated compression rubber. It was necessary to increase the biasing force of the braking spring by the amount of resistance. For this reason, it is necessary to improve the strength of the parts with respect to the reinforced braking spring, and furthermore, there is a problem that the productivity of assembling the product with the reinforced braking spring is lowered and the production cost is increased.

SUMMARY OF THE INVENTION An object of the present invention is to provide an electromagnetic brake device that maintains the effect of reducing collision noise and improves productivity regardless of deterioration over time.

In order to achieve the above object, the present invention provides a brake shoe slidably contactable with an object to be braked, an armature for supporting the brake shoe, and a plurality of brake shoes for pressing the armature and urging the brake shoe in the braking direction. An electromagnetic brake device comprising: a brake spring; and an electromagnetic magnet body that electromagnetically attracts the armature against the biasing force of the brake spring and drives the brake shoe in a direction away from the body to be braked, The electromagnetic magnet body includes a first electromagnetic coil and a second electromagnetic coil that generate an electromagnetic attraction force when energized, and the first electromagnetic coil is an electromagnetic coil that generates a stronger electromagnetic attraction force than the second electromagnetic coil. The second electromagnetic coil is characterized in that when the current is cut off from the energized state, the current cut-off timing is delayed more than that of the first electromagnetic coil.

Advantageous Effects of Invention According to the present invention, it is possible to provide an electromagnetic brake device that maintains the effect of reducing collision noise and improves productivity regardless of deterioration over time.

BRIEF DESCRIPTION OF THE DRAWINGS It is a whole block diagram of the elevator apparatus which concerns on the Example of this invention. 1 is a front view of a hoist according to an embodiment of the present invention; FIG. 1 is a front view of an electromagnetic brake device according to an embodiment of the invention; FIG. FIG. 4 is a plan view of the electromagnetic brake device when FIG. 3 is viewed from the direction of arrow P; It is a figure which shows the connection relationship of the control apparatus which concerns on the Example of this invention, and each apparatus. 4 is a timing chart regarding a brake command, a first electromagnetic coil, and a second electromagnetic coil according to an embodiment of the present invention; It is a flow chart which shows the operation of the electromagnetic brake equipment concerning the example of the present invention.

Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings. Similar components are denoted by similar reference numerals, and similar descriptions are not repeated.

The various constituent elements of the present invention do not necessarily have to be independent entities, and one constituent element may consist of a plurality of members, a plurality of constituent elements may consist of one member, a certain constituent element may part of a component, part of one component overlaps part of another component, and so on.

FIG. 1 is an overall configuration diagram of an elevator apparatus according to an embodiment of the present invention. In the hoistway 101 of the elevator device 10, there are a car 102 that ascends and descends in the hoistway 101, a guide rail 103 that guides the ascending and descending of the car 102, and a balance that ascends and descends in the opposite direction to the ascending and descending direction of the car 102. A weight 104, a guide rail 105 that guides the lifting and lowering of the counterweight 104, a main rope 106 that connects the car 102 and the counterweight 104, a pulley 107 that supports the main rope 106, and the main rope 106 is hoisted. A hoist 108 for raising and lowering the car 102 is provided. Further, the hoistway 101 is provided with a speed governor 109 that senses the speed of the car 102 and operates to activate a safety device when the car 102 accelerates above the rated speed. At the bottom of the hoistway 101, buffers 110 and 111 are provided to reduce impact when the car 102 and the counterweight 104 descend beyond the lowest floor. A landing door 112 is installed on each floor of the elevator device 10 . Further, the hoistway 101 is provided with a control device 113 that controls the car 102, the hoist 108, and the like.

Next, the configuration of the hoist will be described. FIG. 2 is a front view of a hoist according to an embodiment of the invention.

The hoisting machine 108 includes an electric motor (not shown), a sheave 201 that is connected to the electric motor and rotates and on which the main rope 106 is hung, a brake drum 202 that rotates together with the sheave 201, the electric motor and the sheave. A vehicle 201 and a motor frame 203 supporting a brake drum 202 are provided.

Electromagnetic braking devices 300 are arranged above and below the motor frame 203 so as to sandwich the brake drum 202 from above and below. The electromagnetic brake device 300 brakes the hoisting machine 108 by bringing a brake shoe 303 ( FIG. 3 ) into contact with the brake drum 202 .

Next, the structure of the electromagnetic brake device will be explained. 3 is a front view of an electromagnetic brake device according to an embodiment of the present invention, and FIG. 4 is a plan view of the electromagnetic brake device viewed from the direction of arrow P in FIG.

The electromagnetic brake device 300 includes an electromagnetic magnet main body 301 including a first electromagnetic coil 311 and a second electromagnetic coil 312 that generate an electromagnetic attraction force, an armature 302 disposed facing the electromagnetic magnet main body 301, and supported by the armature 302. A brake shoe 303 that slides and brakes a braked object such as a brake drum 202 of the hoist 108, a plurality of braking springs 313 that bias the armature 302 in the braking direction B of the brake shoe 303, and the armature 302. and a plurality of stroke adjustment collars 304 for guiding the stroke.

In the electromagnetic magnet main body 301, a coil housing portion 320 is formed in a circumferential shape when viewed from the direction of arrow P in FIG. 3 (plan view). 312 is stored. The first electromagnetic coil 311 and the second electromagnetic coil 312 are arranged in the coil housing portion 320 so as to overlap from the electromagnetic magnet main body 301 toward the armature 302 . The first electromagnetic coil 311 is an electromagnetic coil that generates stronger electromagnetic attractive force than the second electromagnetic coil 312 . The first electromagnetic coil 311 and the second electromagnetic coil 312 that are stored in the coil storage portion 320 so as to overlap each other are arranged so that the second electromagnetic coil 312 has a weaker electromagnetic attraction force than the first electromagnetic coil 311 and is closer to the armature 302 . It is arranged in the coil storage part 320 so that it becomes.

A plurality of damping spring housings 321 are formed on the inner peripheral side of the coil housing 320 formed in a circular shape, and damping springs 313 are housed therein. In this embodiment, since a plurality of braking springs 313 are arranged on the inner peripheral side of the coil housing portion 320 (the first electromagnetic coil 311 and the second electromagnetic coil 312), the first electromagnetic coil 311 and the second electromagnetic coil 312 Since there is no need to provide a space for arranging the braking spring 313 on the outer peripheral side of the electromagnetic brake device 300, the size of the electromagnetic brake device 300 can be reduced.

The electromagnetic magnet main body 301 is also provided with a plurality of fixing bolts 305 for fixing the electromagnetic brake device 300 to the motor frame 203 of the hoisting machine 108 . The shoe 303 and the body to be braked such as the brake drum 202 of the hoisting machine 108 are arranged at positions facing each other.

The operation of the electromagnetic brake device 300 will be described. In the electromagnetic brake device 300, when the first electromagnetic coil 311 and the second electromagnetic coil 312 are energized, an electromagnetic attraction force is generated, and the armature 302 is attracted toward the electromagnetic magnet main body 301, and as a result, the brake shoe 303 is pulled toward the brake drum 202. move away from Also, in the electromagnetic brake device 300 , when the first electromagnetic coil 311 and the second electromagnetic coil 312 are turned off from the energized state, the armature 302 attracted to the electromagnetic magnet main body 301 side is electromagnetically stopped by the biasing force of the braking spring 313 . It is pulled away from the magnet main body 301 , and as a result, the brake shoe 303 operates to press against the brake drum 202 .

Further, the electromagnetic brake device 300 is provided with a brake operation detector 330 that detects contact of the brake shoe 303 with the brake drum 202 . The brake operation detector 330 includes a switch portion 330a attached to the electromagnetic magnet main body 301 and a contact portion 330b attached to the armature 302 with which the switch portion 330a contacts. When the armature 302 is attracted to the electromagnetic magnet main body 301 by the electromagnetic attraction forces of the first electromagnetic coil 311 and the second electromagnetic coil 312, the tip of the switch portion 330a and the contact portion 330b are in contact with each other. 330 detects a state in which the brake shoe 303 is not in contact with the brake drum 202, that is, a non-braking state. On the other hand, when the electric current to the first electromagnetic coil 311 and the second electromagnetic coil 312 is cut off and the armature 302 is pressed toward the brake drum 202 by the braking spring 313, the tip of the switch portion 330a and the contact portion 330b are in contact with each other. Since they are separated, the brake operation detector 330 detects a state in which the brake shoe 303 is in contact with the brake drum 202, that is, a braking state.

Next, the connection relationship between the control device 113 that controls the elevator device 10 and each device will be described with reference to FIG. FIG. 5 is a diagram showing the connection relationship between the control device and each device according to the embodiment of the present invention.

A control device 113 installed in the hoistway 101 includes a storage unit 113a that stores a control program for controlling the elevator device 10, and a calculation unit 113b that performs calculations based on the input information of each device and the control program. .

The elevator device 10 includes a plurality of sensor groups such as a position sensor 501 for detecting the position of the car 102, a hall call button 502 installed on each floor for calling the car 102, and a hall call button 502 installed in the car 102. A destination floor input unit 503 for inputting the destination floor, a door open/close button 504 installed in the car 102, a brake operation detector 330 installed in the electromagnetic brake device 300, etc. are connected to the control device 113. Information is entered.

The control device 113 includes the hoisting machine 108, a door opening/closing unit 510 for opening and closing the door of the car 102, and a first electromagnetic coil 311 and a second electromagnetic coil 312 for braking and releasing the electromagnetic brake device 300. They are connected and controlled based on the results calculated by the calculation unit 113b.

In an electromagnetic brake device used in elevator hoisting machines, etc., when the brake shoe is switched from the released state to the braking state, the electromagnetic attraction force is released and the armature is pressed by the biasing force of the braking spring. And the brake shoe moves at a high speed and collides with the drum. Therefore, a collision sound is generated as the electromagnetic attractive force is released. Means for suppressing collision noise will be described with reference to FIGS. 3 to 7. FIG.

FIG. 6 is a timing chart regarding brake commands, first electromagnetic coils, and second electromagnetic coils according to the embodiment of the invention, and FIG. 7 is a flow chart showing the operation of the electromagnetic brake device according to the embodiment of the invention.

In this embodiment, a plurality of electromagnetic coils, ie, the first electromagnetic coil 311 and the second electromagnetic coil 312 are used as means for electromagnetically attracting the armature 302 as described above. The second electromagnetic coil 312 is an electromagnetic coil that generates a weaker electromagnetic attractive force than the first electromagnetic coil 311 .

In this embodiment, when the first electromagnetic coil 311 and the second electromagnetic coil 312 are energized and the current is interrupted, the respective timings for interrupting the current are staggered.

The energization and interruption of the first electromagnetic coil 311 and the second electromagnetic coil 312 are controlled by commands from the control device 113 based on brake commands generated by the control device 113 .

As shown in FIG. 6, in the electromagnetic brake device 300, when the brake command is switched from braking to releasing at time t1, the first electromagnetic coil 311 and the second electromagnetic coil 312 are energized, and the armature 302 moves toward the electromagnetic magnet main body 301 side. is attracted to As a result, the brake shoes 303 are separated from the brake drum 202 .

Further, the electromagnetic brake device 300 cuts off the current to the first electromagnetic coil 311 when the brake command switches from release to braking at time t2. At this time, the electric current to the second electromagnetic coil 312 is not interrupted, so that the armature 302 is subjected to a reaction force against the braking springs 313 . However, the reaction force of the second electromagnetic coil 312 does not reach the point where the armature 302 is attracted to the electromagnetic magnet main body 301 against the biasing force of the plurality of braking springs 313 . The armature 302 moves toward the brake drum 202 while reducing its speed, and the brake shoe 303 comes into contact with the brake drum 202 . Then, after a predetermined time has elapsed from the first electromagnetic coil 311 (time t3), the energization of the second electromagnetic coil 312 is cut off. In other words, the second electromagnetic coil 312 delays the current interruption timing more than the first electromagnetic coil 311 .

Similarly, in the electromagnetic brake device 300, when the brake command switches from braking to release at time t4, the first electromagnetic coil 311 and the second electromagnetic coil 312 are energized, and the armature 302 is attracted to the electromagnetic magnet main body 301 side. . After that, when the brake command is switched from release to braking at time t5, the electromagnetic brake device 300 cuts off the energization of the first electromagnetic coil 311, and at time t6 delayed from the cutoff of the current to the first electromagnetic coil 311, the second Electricity to the electromagnetic coil 312 is cut off.

In this embodiment, the current interruption time t3 (t6) of the second electromagnetic coil 312 is delayed from the current interruption time t2 (t5) of the first electromagnetic coil 311 by a predetermined time t3-t2 (t6-t5). . Regarding the predetermined time t3-t2 (t6-t5), considering the electromagnetic attraction force of the first electromagnetic coil 311 and the second electromagnetic coil 312 and the biasing force of the plurality of braking springs 313, make me remember.

Also, the current interruption time t3 (t6) of the second electromagnetic coil 312 may be determined based on the braking operation detector 330. FIG. When the current to the first electromagnetic coil 311 is cut off, the armature 302 is separated from the electromagnetic magnet main body 301 by the biasing force of the braking spring 313 and the brake shoe 303 contacts the brake drum 202 . When the brake shoe 303 contacts the brake drum 202, the tip of the switch portion 330a of the brake operation detector 330 is separated from the contact portion 330b, and the brake operation detector 330 is turned off. When the brake operation detector 330 turns OFF, the current to the second electromagnetic coil 312 is cut off.

Next, processing of the control device 113 will be described with reference to FIG.

In step S701, control device 113 determines whether or not there is a brake release command. If there is a brake release command (Yes in step S701), the process proceeds to step S702. If there is no brake release command (No in step S701), the process of step S701 is repeated.

In step S702, energization of the first electromagnetic coil 311 and the second electromagnetic coil 312 is started, and the process proceeds to step S703.

In step S703, the control device 113 determines whether or not there is a braking command. If there is a braking command (Yes in step S703), the process proceeds to step S704. If there is no braking command (No in step S703), the process of step S703 is repeated.

In step S704, the current to the first electromagnetic coil 311 is interrupted, and the process proceeds to step S705.

In step S705, it is determined whether a predetermined period of time has elapsed after the current to the first electromagnetic coil 311 was interrupted, or whether the brake operation detector has been turned off. If a predetermined time has passed since the current cutoff to the first electromagnetic coil 311, or if the brake operation detector is turned off (Yes in step S705), the process proceeds to step S706. If the predetermined time has not passed since the current interruption to the first electromagnetic coil 311 or if the brake operation detector is ON (No in step S705), the process of step S705 is repeated.

In step S706, after the current to the second electromagnetic coil 312 is interrupted, the processing from step S701 is repeated.

As described above, in this embodiment, when interrupting the current from the energized state of the first electromagnetic coil and the second electromagnetic coil, the time for interrupting the current is staggered, so that the current to one electromagnetic coil is interrupted. After that, the other electromagnetic coil secures the reaction force to the braking spring. As a result, according to the present embodiment, when the current to the electromagnetic coil is interrupted, the moving speed of the armature due to the biasing force of the braking spring can be suppressed, so that the collision noise of the brake shoe colliding with the brake drum can be reduced. can.

Further, according to the present embodiment, it is possible to continuously reduce collision noise without being affected by deterioration over time.

Furthermore, in the present invention, since almost no reaction force acts during braking, there is no need to increase the urging force of the braking spring more than necessary, so productivity can be improved.

Furthermore, in this embodiment, the second electromagnetic coil having a weaker electromagnetic attractive force than the first electromagnetic coil is arranged on the amateur side. By arranging in this way, in this embodiment, it is possible to effectively utilize the reaction force of the second electromagnetic coil.

In addition, the present invention is not limited to the above-described embodiments, and includes various modifications. The above-described embodiments have been described in detail for easy understanding of the present invention, and are not necessarily limited to those having all the described configurations.

DESCRIPTION OF SYMBOLS 10... Elevator apparatus, 101... Hoistway, 102... Car, 103... Guide rail, 104... Counterweight, 105... Guide rail, 106... Main rope, 107... Pulley, 108... Winding machine, 109... Speed control machine, 110... buffer, 111... buffer, 112... landing door, 113... control device, 113a... storage unit, 113b... calculation unit, 201... sheave, 202... brake drum, 203... motor frame, 300... electromagnetic Brake device 301 Electromagnetic magnet body 302 Armature 303 Brake shoe 304 Stroke adjusting collar 305 Fixing bolt 311 First electromagnetic coil 312 Second electromagnetic coil 313 Braking spring 320... Coil storage part 321... Braking spring storage part 330... Brake operation detector 330a... Switch part 330b... Contact part at the tip 501... Position sensor 502... Hall call button 503... Destination floor input part , 504... Door opening/closing button, 510... Door opening/closing part

Claims (7)

a brake shoe slidably contactable with an object to be braked; an armature for supporting the brake shoe; a plurality of braking springs for pressing the armature and urging the brake shoe in a braking direction; An electromagnetic brake device comprising an electromagnetic magnet body that electromagnetically attracts against the biasing force and drives the brake shoe in a direction away from the braked body,
The electromagnetic magnet body includes a first electromagnetic coil and a second electromagnetic coil that generate an electromagnetic attraction force by energization,
The first electromagnetic coil is an electromagnetic coil that generates a stronger electromagnetic attractive force than the second electromagnetic coil,
An electromagnetic brake device according to claim 1, wherein when the second electromagnetic coil cuts off the current from an energized state, the timing of cutting off the current is delayed from that of the first electromagnetic coil. In claim 1 ,
An electromagnetic brake device, wherein the first electromagnetic coil and the second electromagnetic coil are housed in a coil housing portion formed in the body of the electromagnetic magnet. In claim 2 ,
The electromagnetic brake device according to claim 1, wherein the coil storage portion is formed in a circular shape, and the plurality of braking springs are arranged on the inner peripheral side of the coil storage portion. In claim 2 ,
The electromagnetic brake device, wherein the first electromagnetic coil and the second electromagnetic coil are arranged so as to overlap from the electromagnetic magnet main body toward the armature. In claim 4 ,
The electromagnetic brake device, wherein the second electromagnetic coil is arranged closer to the amateur than the first electromagnetic coil. In claim 1 ,
An electromagnetic brake device according to claim 1, wherein the electromagnetic brake device comprises a brake operation detector for detecting contact of the brake shoe with the body to be braked. In claim 6 ,
The electromagnetic brake device, wherein the brake operation detector comprises a switch portion attached to the electromagnetic magnet body and a contact portion attached to the armature with which the switch portion contacts.

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