JPH07285750A - Electromagnetic brake device - Google Patents

Abstract

PURPOSE:To perform detection of a mechanical loss containing not only the operation state of a brake means but also the that of a release means. CONSTITUTION:An electromagnetic brake device comprises an excitation coil 90 arranged in a yoke 60; a fixed core 80 securely arranged in the excitation coil 90; a moving core 70 positioned facing the fixed core 80 and axially slidably arranged therein; and strain sensors 13a and 13b arranged in the slide direction of the moving coil 70. During non-energization to the excitation coil 90, the moving core 70 is pressed against the strain sensor 13b through a brake lever 10 through the press force of a brake spring, and the operation press force of the moving core 70 is detected as a brake force exerted on a brake drum. Meanwhile, during non-energization to the excitation coil 90, the moving core 70 is pressed against the strain sensor 13a through slide owing to a suction force generated between the moving core 70 and the fixed core 80 and the operation press force of the moving core 70 is detected.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an electromagnetic braking device, and more particularly to an electromagnetic braking device suitable for simplifying maintenance and inspection of an electromagnetic braking device in an elevator.

[0002]

2. Description of the Related Art FIG. 4 is a schematic configuration diagram of a conventional electromagnetic braking device disclosed in, for example, Japanese Utility Model Laid-Open No. 3-12873. This device presses / releases the brake drum 1 to operate an elevator connected via a wire or the like. In the figure, as brake means, a brake shoe 3 is arranged so as to sandwich the brake drum 1 from the outer peripheral surface of the brake drum 1, and the brake drum 1 of the brake shoe 3.
A brake lining 2 arranged on the surface facing the brake arm 4, a brake arm 4 for pressing and releasing the brake shoe 3 toward the brake drum 1, and a brake arm 4 facing the brake drum 1 side. That is, the braking spring 5 for pressing with elastic pressure in the braking direction. Further, a yoke 6 forming an outer frame as a release means of the electromagnetic braking device, a movable iron core 7 slidably arranged, a fixed iron core 8 fixedly arranged inside the yoke 6, a movable iron core 7 and The exciting coil 9 is arranged on the outer peripheral side of the fixed iron core 8 and is excited by energization to generate an electromagnetic force between the movable iron core 7 and the fixed iron core 8. And a brake lever 10 for driving the brake arm 4 in a braking release direction, that is, for driving the brake shoe 3 in a direction of pulling the brake shoe 3 from the brake drum 1. In addition, the device
A pressure sensor 12 that detects the pressing force of the braking spring 5 on the brake arm 4.

Next, the operation of the conventional device having the above configuration will be described.

Normally, the elevator is braked and held at a specific floor by braking the brake drum 1. This is a very important function for safety, and is always on the braking side in the normal state, and is configured to release the braking by energizing the exciting coil 9 and operate the elevator.

Therefore, since the exciting coil 9 is not energized during braking, the brake arm 4 is provided with the braking spring 5
It is pushed toward the brake drum 1 by the pressure.
The brake lining 2 is pressed against the brake drum 1 by the brake shoe 3 that receives the pressing force of the braking spring 5 via the brake arm 4, and the movement of the brake drum 1 is restricted. That is, the brake drum 1 obtains the braking force by the pressure of the braking spring 5.

On the other hand, when the braking is released, the exciting coil 9 is energized. As a result, an electromagnetic force, that is, an attractive force is generated between the movable iron core 7 and the fixed iron core 8 inside the yoke 6, and the movable iron core 7 is driven to the fixed iron core 8 side. With this driving force, the brake lever 10 that interlocks with the movable iron core 7
Is driven, and the brake arm 4 is driven through the push rod 11 against the pressing force of the braking spring 5 in the braking release direction. By this brake releasing operation, the brake lining 2 is pulled out from the brake drum 1 through the movements of the brake arm 4 and the brake shoe 3, so that the braking force on the brake drum 1 is released.

By the way, the pressure sensor 12 detects the pressing force of the braking spring 5 against the brake arm 4, and detects whether or not a sufficient braking force from the brake shoe 3 to the brake drum 1 is secured. .

The electromagnetic braking device having the above-described structure is a very important mechanism for ensuring the safety of the elevator, and maintenance work is performed at appropriate intervals.

[0009]

However, since the conventional electromagnetic braking device is constructed as described above, when a mechanical loss occurs in the movement of the braking device, this loss is applied from the braking spring 5 to the brake arm 4. The pressure sensor 12 can be used to detect the mechanical loss generated in the system of the brake means of the brake shoe 3 and the brake lining 2, but there is no means for detecting the mechanical loss generated in the release means. Therefore, with respect to the releasing means composed of the movable iron core 7, the fixed iron core 8, the exciting coil 9, etc.,
Regardless of the quality of the condition, there was no choice but to disassemble and perform maintenance inspection. As described above, in order to ensure the safety of the elevator, it is important to grasp the state of the sliding surface of the movable iron core 7, but there is no means for detecting the mechanical loss generated by the releasing means, so that daily maintenance and inspection is possible. There is a problem that such a load increases.

The present invention has been made in order to solve the above problems, and provides an electromagnetic braking device capable of detecting mechanical loss including not only the braking means but also the operating state of the releasing means. The purpose is to do.

[0011]

To achieve the above object, the invention according to claim 1 provides a braking means for applying a braking force to a braked portion by pressing and a braking means by sliding a movable portion. And a releasing means for driving the lever in a direction against the pressure to release the movement of the braked portion, and a braking force applied to the braked portion based on the operation pressing force of the movable portion, which is arranged in the sliding direction of the movable portion. And a detection means.

According to a second aspect of the present invention, in the electromagnetic braking device according to the first aspect, the releasing means is an exciting portion arranged inside an outer frame, and the movable portion is fixedly arranged inside the exciting portion. And a fixed part for sliding the inside thereof, and the movable part is slid by energizing the exciting part or pressing the braking means.

According to a third aspect of the present invention, in the electromagnetic braking device according to the second aspect, the detecting means is a strain sensor for detecting an operating pressing force of the movable portion when the exciting portion is not energized. Is characterized by.

According to a fourth aspect of the present invention, in the electromagnetic braking device according to the second aspect, the detecting means is a strain sensor that detects an operating pressing force of the movable portion when the exciting portion is energized. Characterize.

According to a fifth aspect of the present invention, in the electromagnetic braking device according to the first aspect, there is provided computing means which is connected to the detecting means and obtains a state of the braking force applied to the braked portion according to the output of the detecting means. It is characterized by having.

According to a sixth aspect of the present invention, in the electromagnetic braking device according to the fifth aspect, the calculating means is connected to a control device for controlling energization of the exciting unit.

[0017]

In the present invention having the above-mentioned structure, the movable portion slides due to the pressing of the braking means when the exciting portion is not energized.
Since the detection means is arranged in the sliding direction of the movable portion, it is possible to detect the braking force applied to the braked portion through the operation pressing force due to the sliding movement of the movable portion.

On the other hand, when the exciting portion is energized, the fixed portion generates an electromagnetic force to attract and slide the movable portion. Since the detecting means is arranged in the sliding direction of the movable part,
It is possible to detect the operation pressing force due to the sliding of the movable portion.

The arithmetic unit compares the output from the detecting means obtained as described above with an appropriate value of the operating pressure to determine whether the operating pressure of the releasing means is normal as well as the braking means. You can judge whether.

Further, the arithmetic unit can determine whether or not the change of the operating pressing force is faithfully corresponding to the timing of switching by obtaining the timing of energization / de-energization from the control unit.

[0021]

EXAMPLES Example 1. Hereinafter, preferred embodiments of the present invention will be described with reference to the drawings. It should be noted that substantially the same elements as those in the conventional example are denoted by the same reference numerals and the description thereof will be omitted.

FIG. 1 is a partial schematic structural view showing an embodiment of an electromagnetic braking device according to the present invention, and the parts omitted from the drawing have substantially the same structure as the conventional one. In the figure, the braking means that applies a braking force to the brake drum 1, which is the portion to be braked by pressing, is composed of a brake shoe, a brake lining, a brake arm, and a braking spring, which are almost the same as conventional ones.

Further, in the present device, as a releasing means, a yoke 60 forming an outer frame, a cylindrical exciting coil 90 as an exciting portion arranged inside the yoke 60, and fixed inside the exciting coil 90. It has a cylindrical fixed iron core 80 as a fixed portion arranged, and a movable iron core 70 as a movable portion that is arranged so as to face the fixed iron core 80 and be slidable in the axial direction inside thereof.

A feature of this embodiment is that ring-shaped strain sensors 13a and 13b are provided as detecting means in the sliding direction of the movable iron core 70. As a result, it is possible to detect the operation pressing force due to the sliding of the movable iron core 70.

FIG. 2 is a block diagram showing an example of the mechanical loss detection circuit applied to the configuration of FIG. This mechanical loss detection circuit is a means for obtaining outputs from the strain sensors 13a and 13b and detecting mechanical loss of the electromagnetic braking device. In FIG. 2, the mechanical loss detection circuit is
An amplifier 14 for amplifying the detection signals output from the strain sensors 13a and 13b, and a state of the braking force applied to the brake drum 1 according to the outputs of the strain sensors 13a and 13b obtained through the amplifier 14 are obtained to mechanically A calculation unit 15 that calculates the loss state and a communication control unit 16 that transfers the mechanical loss state obtained by the calculation unit 15 to a maintenance device (not shown).
It consists of and.

The operation of the electromagnetic braking device in this embodiment will be described below.

When the elevator is in the braking state, since the exciting coil 90 is in the non-energized state, there is no attractive force between the movable iron core 70 and the fixed iron core 80. Therefore, the brake shoe presses the brake lining against the brake drum with the pressing force of the braking spring obtained via the brake arm. As a result, the brake drum obtains a braking force.

Further, in this embodiment, the movable iron core 7 is moved through the brake lever 10 by the pressing of the braking spring.
0 is slid in the upper direction of the drawing (braking direction). That is, the pressing force of the braking spring is transmitted to the movable iron core 70 through the brake lever 10, and as a result, the movable iron core 70 is moved.
Receives the pressing force of the braking spring in the braking direction,
The strain sensor 13b is pressed as the operation pressing force of the movable iron core 70. Therefore, the braking force applied to the brake drum can be detected as the operation pressing force of the movable iron core 70.

The strain sensor 13b outputs a signal based on the operating pressure force from the movable iron core 70. The output of the strain sensor 13b is given to the arithmetic unit 15 through the amplifier 14, and compared with a proper value set in advance here to determine whether the operating pressing force is normal. The determination result is transferred to the maintenance device (not shown) through the communication control unit 16.

At the time of determination, if the electromagnetic braking device is normal, the braking force applied to the brake drum becomes the operating pressing force of the movable iron core 70 as it is, and an appropriate value should be detected by the calculation unit 15. If there is a hit between the iron core 70 and the fixed iron core 80 or the yoke 60, there is a problem in the movement of the brake lever 10, there is an abnormality in the pressing force of the braking spring itself, or some other abnormality occurs. Of course, since the operation pressing force detected by the strain sensor 13b differs from an appropriate value, it can be easily determined that an abnormality has occurred in the electromagnetic braking device.

On the other hand, when the elevator is in the braking release state, the exciting coil 90 is energized, so that an attractive force is generated between the movable iron core 70 and the fixed iron core 80, and the movable iron core 70 moves downward (in the drawing). Driven in the release direction). The movable iron core 70 slides in the releasing direction to push down the brake lever 10 in the releasing direction. As a result, the braking spring is driven in the direction opposite to the pressing, and the braking force applied to the brake drum is released.

Further, in this embodiment, the movable iron core 70
The movable iron core 70 is pressed against the strain sensor 13a arranged in the releasing direction by sliding with the fixed iron core 80 by the suction force. This operation pressing force is due to the electromagnetic force generated between the movable iron core 70 and the fixed iron core 80 and the brake lever 10.
The repulsive force of the braking spring given through the above is combined.

The pressing force of the strain sensor 13b is released by sliding the movable core 70 in the releasing direction. Instead, the strain sensor 13a receives the operating pressing force of the movable iron core 70. As a result, the respective signal outputs of the strain sensors 13a and 13b change in accordance with the operating pressure. The strain sensor 13a outputs a signal based on the operating pressure force from the movable iron core 70. The output of the strain sensor 13a is given to the arithmetic unit 15 through the amplifier 14, and is compared with an appropriate value set in advance here to determine whether or not the operating pressing force is normal. The determination result is transferred to the maintenance device (not shown) through the communication control unit 16.

Here, as in the braking state of the elevator,
If any abnormality has occurred, the operating pressing force detected by the strain sensor 13a is different from an appropriate value, so it can be easily determined that an abnormality has occurred in the electromagnetic braking device.

As described above, by constantly monitoring the braking state of the electromagnetic braking device detected by the strain sensors 13a and 13b through the maintenance device, not only the mechanical loss generated in the braking means but also the mechanical loss generated in the releasing means can be obtained. Since abnormalities can also be detected for physical loss, maintenance and inspection work can be greatly simplified.

In terms of manufacturing cost, the mechanical loss of the braking means and the releasing means need only be arranged using the same mechanical loss detection circuit and in both directions in which the movable iron core 70 slides. But it can be significantly reduced.

It should be noted that the operation pressing force from one of the strain sensors 13a and 13b is not detected when the exciting coil 90 is energized and de-energized, but both strain sensors 13 are constantly detected.
The operating pressure may be detected from a and 13b.

Example 2. In the first embodiment, the condition of the mechanical loss detecting circuit for detecting an abnormality by the change of the output signals of the strain sensors 13a and 13b is shown in FIG. By doing so, the accuracy of abnormality detection can be further improved.

FIG. 3 is a block diagram showing another embodiment of the mechanical loss detection circuit applied to the configuration of FIG. It should be noted that the same reference numerals are given to the substantially similar elements to those in FIG. In the mechanical loss detection circuit according to the present embodiment, the calculation unit 15 is connected to the control device 17 that controls energization of the exciting coil 90 such as energizing or de-energizing the exciting coil 90.
The feature is that the control state is monitored.

According to the above configuration, the exciting coil 9
It is possible to detect whether or not the movable iron core 70 is driven by reacting faithfully to the energization and de-energization of 0. That is, although the movable iron core 70, the fixed iron core 80, the sliding surfaces of the exciting coil 90, the driving path, and the like are abnormal, the exciting coil 90 is switched between energized and de-energized, but the movable iron core 70 is switched.
If A does not immediately respond to the timing and moves with a delay, there is a possibility that the abnormality determination cannot be made only by the change in the value of the operation pressing force detected by the strain sensors 13a and 13b.

Therefore, in this embodiment, the information of the control unit 17 is given to the calculation unit 15 as to whether or not the movable iron core 70 faithfully reacts to the actual energization state of the exciting coil 90. By making the judgment, it becomes possible to make not only the value of the mere operation pressing force but also the abnormality judgment of the dynamic characteristic that responds to the timing of the energization control, and the judgment accuracy can be further improved.

[0042]

According to the electromagnetic braking device of the present invention, since the detecting means is provided in the sliding direction of the movable portion, the braking force is applied to the braked portion as the operation pressing force of the movable portion in the braking state when the exciting portion is not energized. It is possible to detect such a braking force.
Further, it becomes possible to detect the operation pressing force of the movable portion in the brake released state when the exciting portion is energized.

The calculating means can easily detect the mechanical loss of not only the braking means but also the releasing means by obtaining the state of this operation pressing force and comparing and judging with the respective appropriate values.

Further, since the control means for controlling the energization of the exciting portion is connected to the calculating means, it is possible to judge the dynamic characteristic abnormality that not only the value of the operation pressing force but also the timing of the energization control. It is also possible to perform the above, and it is possible to further improve the determination accuracy.

Therefore, the operating state of braking / release including the releasing means can be accurately and easily grasped,
This enables early detection of abnormalities and simplification of maintenance work.

[Brief description of drawings]

FIG. 1 is a partial schematic configuration diagram of an embodiment of an electromagnetic braking device according to the present invention.

FIG. 2 is a block diagram of an embodiment of a mechanical loss detection circuit applied to the configuration of FIG.

FIG. 3 is a block diagram of another embodiment of the mechanical loss detection circuit applied to the configuration of FIG.

FIG. 4 is a schematic configuration diagram of a conventional electromagnetic braking device.

[Explanation of symbols]

 1 Brake Drum 2 Brake Lining 3 Brake Shoe 4 Brake Arm 5 Brake Spring 6,60 Yoke 7,70 Movable Iron Core 8,80 Fixed Iron Core 9,90 Excitation Coil 10 Brake Lever 11 Push Rod 13a, 13b Strain Sensor 14 Amplifier 15 Calculation Unit 16 communication control unit 17 control device

Claims (6)

[Claims] 1. Braking means for applying a braking force to the braked portion by pressing, and releasing means for releasing the movement of the braked portion by sliding the movable part to drive the braking means in a direction against the pressing. An electromagnetic braking device comprising: a detection unit that is arranged in a sliding direction of the movable unit and that detects a braking force applied to the braked portion by an operation pressing force of the movable unit. 2. The electromagnetic braking device according to claim 1, wherein the releasing means includes an exciting portion arranged inside an outer frame, and a movable portion fixedly arranged inside the exciting portion and sliding the movable portion inside thereof. An electromagnetic braking device, comprising: a fixed part that allows the movable part to slide by energizing the exciting part or pressing the braking means. 3. The electromagnetic braking device according to claim 2, wherein the detection means is a strain sensor that detects an operation pressing force of the movable portion when the exciting portion is not energized. apparatus. 4. The electromagnetic braking device according to claim 2, wherein the detecting means is a strain sensor that detects an operation pressing force of the movable portion when the exciting portion is energized. . 5. The electromagnetic braking device according to claim 1, further comprising a computing unit that is connected to the detecting unit and obtains a state of a braking force applied to the braked portion according to an output of the detecting unit. Electromagnetic braking device. 6. The electromagnetic braking device according to claim 5, wherein the computing means is connected to a control device that controls energization of the exciting unit.