JP2012153484A - Electromagnetic braking system, and elevator system provided with the same - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an electromagnetic braking system and an elevator system provided with the same capable of detecting a degradation in spring force of a braking spring with a simple structure.SOLUTION: A bracket 15 is arranged in a manner of being fixed to one end of the braking spring 7 on the side of a brake lever 6, and of being extended to the another end of the braking spring 7 on the side opposite to the brake lever through the sideway of the braking spring 7. A detecting switch 16 is fitted to the another end of the braking spring 7 of the bracket 15 on the side opposite to the brake lever at a predetermined facing distance in the direction where the braking spring 7 extends further beyond the another end of the braking spring 7 on the side opposite to the brake lever, so that the detecting switch 16 is operated for detection when the braking spring 7 extends and reaches a tolerance limit value.

Description

  The present invention relates to an electromagnetic braking device suitable for use in an elevator and an elevator device including the electromagnetic braking device.

  In the elevator system, the carriage and the counterweight are connected by a main rope, and the elevator is lifted and lowered by a hoisting machine around which the main rope is wound. The hoisting machine winds the main rope. A driving device for rotating the sheave and an electromagnetic braking device. This electromagnetic braking device has a structure in which a braking force is generated by pressing a brake drum attached to a shaft of an electric motor. In order to hold down the brake drum, a spring force from a braking spring is applied to the brake drum as a pressing force via a brake shoe or the like. When the pressing force due to the spring force is reduced, the car is dropped or raised while the elevator is stopped, and safety is lost. Therefore, in the conventional electromagnetic braking device, a pressure detector or the like is provided at a position where the spring force of the braking spring directly acts, and a decrease in the spring force of the braking spring is detected from a change in detected pressure by the pressure detector (for example, (See Patent Document 1).

JP 2010-159155 A

  However, since the conventional electromagnetic braking device directly detects a change in the spring force of the braking spring with a pressure detector or the like, the pressure detector may become expensive, and the existing device has a pressure detector. When adding, the brake spring must be disassembled and attached, which makes the work cumbersome. Moreover, since the spring force of the braking spring changes between the braking state and the released state, it is necessary to perform pressure measurement while discriminating the state, which is complicated.

  An object of the present invention is to provide an electromagnetic braking device and an elevator device including the electromagnetic braking device that can detect a spring force drop of the braking spring with a simple structure.

  In order to achieve the above object, the present invention has a brake drum, a brake lever that presses a brake pad against the brake drum, and one end that acts on the brake lever so as to apply a pressing force to the brake drum. A brake spring, a brake spring rod arranged at the center of the brake spring, and the brake spring rod disposed on the brake spring rod and fixed to the end of the brake spring rod located on the other end side of the brake spring In the electromagnetic braking device including the end fixing member, an allowable limit value of the axial length of the braking spring is set, and the position of the end fixing member is detected when the allowable limit value is reached. A detection switch is provided.

  According to such a configuration, when the axial length of the managed braking spring exceeds the allowable limit value, the end fixing member such as a loose fixing nut moves to the right and contacts the detection switch, and the detection Since the switch is operated, a decrease in the spring force of the brake spring can be detected by a signal from the detection switch. In addition, it is not necessary to discriminate between the braking state and the released state as compared with the conventional method in which the spring force of the braking spring is directly measured, so that an abnormality can be reliably detected with a simple configuration.

  Further, the present invention provides a bracket that is fixed to the one end side of the brake spring and extended to the other end side of the brake spring, and the end of the brake spring is provided on the other end side of the brake spring in the bracket. The detection switch is attached at a predetermined facing distance in a direction in which the brake spring extends further than the portion fixing member.

  According to such a configuration, even when the detection switch is attached to the existing electromagnetic braking device, the attaching operation can be easily performed without disassembling the braking spring.

  In the present invention, an arm portion is provided on the other end side of the brake spring, and the detection switch is disposed opposite the arm portion so as to detect a decrease in spring force of the brake spring from a change in position of the arm portion. It is characterized by that.

  According to such a configuration, the detection switch needs to be arranged in a delicate positional relationship as in the case of directly detecting the movement of the fixing nut while avoiding the brake spring rod that may not be located nearby. Thus, the other end of the arm and the detection switch can be disposed opposite to each other at any position where the workability is good and no malfunction occurs.

  The present invention also includes a main rope connecting between a car and a counterweight, and the car is moved up and down by a hoisting machine on which the main rope is wound, and the hoisting machine is a sheave on which the main rope is wound. A driving device for rotating the motor and an electromagnetic braking device, wherein the electromagnetic braking device is provided with a brake drum, a brake lever for pressing a brake pad against the brake drum, and a pressing force to the brake drum. A brake spring having one end applied to the brake lever, a brake spring rod disposed at the center of the brake spring, and the brake spring disposed on the other end of the brake spring with the brake spring disposed on the brake spring rod In an elevator apparatus having an electromagnetic braking device constituted by an end fixing member fixed to an end of the braking spring rod, an allowable limit value of the axial length of the braking spring is set, and the allowable limit value is set. Characterized in that a detection switch that operates by detecting the position of the end portion fixing member when it reaches a value.

  According to such a configuration, in the elevator apparatus, when the axial length of the brake spring being managed exceeds the allowable limit value, the end fixing member such as the loose fixing nut moves to the right and becomes a detection switch. Since the contact is operated and the detection switch is operated, a decrease in spring force of the brake spring can be detected by a signal from the detection switch. In addition, it is not necessary to discriminate between the braking state and the released state as compared with the conventional method in which the spring force of the braking spring is directly measured, so that an abnormality can be reliably detected with a simple configuration.

  In the electromagnetic brake device according to the present invention, when the axial length of the managed braking spring exceeds the allowable limit value, the end fixing member such as a loose fixing nut moves to the right and contacts the detection switch, and the detection Since the switch is operated, a decrease in the spring force of the brake spring can be detected by a signal from the detection switch. In addition, it is not necessary to discriminate between the braking state and the released state as compared with the conventional method in which the spring force of the braking spring is directly measured, so that an abnormality can be reliably detected with a simple configuration.

It is a side view which shows the principal part of the electromagnetic braking device by one embodiment of this invention. It is a side view which shows the other state of the electromagnetic drive device shown in FIG. It is a side view which shows the principal part of the electromagnetic braking device by other embodiment of this invention. It is a schematic block diagram of the elevator apparatus using the electromagnetic drive device shown in FIG. It is an enlarged view of the electromagnetic drive device shown in FIG.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings.

  FIG. 4 is a schematic configuration diagram of an elevator apparatus using the electromagnetic drive device according to the embodiment of the present invention. The car 1 and the counterweight 2 are connected by the main rope 3, and the intermediate part of the main rope 3 is wound around the sheave of the hoisting machine 4, and the hoisting machine 4 is driven to drive the car 1. It is configured. An electromagnetic braking device is connected to the rotating shaft of the hoisting machine 4. The electromagnetic braking device includes a brake drum 5 connected to the central axis of the hoisting machine 4 and a brake shoe that can be pressed against the outer periphery of the brake drum 5. A brake lever 6 having a brake force, and a brake spring 7 that presses the outer periphery of the brake drum 5 against the brake shoe 5 to apply a biasing force, and an electromagnetic release that provides a release force against the brake spring 7. The apparatus 8 is comprised. In such an electromagnetic braking device, when the release force by the electromagnetic release device 8 is removed, the spring force of the brake spring 7 rotates the brake lever 6 and presses against the brake drum 5 to brake the hoisting machine 4.

  FIG. 5 is an enlarged view of the electromagnetic braking device. Brake levers 6 rotatably supported by a rotating shaft 10 at the lower end are arranged on both sides of the brake drum 5. 5 has a brake shoe 9 to be pressed. A brake spring 7 that applies a spring force that presses the brake shoe 9 against the brake drum 5 is disposed along the brake spring rod 11, and applies a counterclockwise rotational force to the right brake lever 6 to increase the braking force. When releasing, the electromagnetic release device 8 applies a clockwise rotational force to the right brake lever 6. When there is a pair of brake levers 6, the left side has the same configuration.

  FIG. 1 is a more detailed configuration diagram showing the main part of the electromagnetic braking device described above. A brake lever 6 having a lower end rotatably supported by a rotating shaft 10 is pressed against an outer peripheral surface of a brake drum 5. A possible brake shoe 9 is provided. The free end side of the upper part of the brake lever 6 can be moved left and right along the brake spring rod 11, and when releasing the braking force, the electromagnetic release device 8 is driven to move in the right direction as shown in FIG. Is applied, the electromagnetic force of the electromagnetic release device 8 is released, and the brake spring 7 moves to the left in the figure.

  The left end of the brake spring rod 11 is fixed, and a fixing nut 13 and an adjusting nut 14 are screwed to the right end via a spring receiving member 12. A brake spring 7 is arranged along the brake spring rod 11 between the brake lever 6 and the spring receiving member 12, and is sandwiched between the left end of the brake spring 7 and the brake lever 6 or an appropriate fixing portion located in the vicinity thereof. A bracket 15 is fixed to the frame. The bracket 15 is configured to extend to the right side of the spring receiving member 12 through the side of the brake spring 7, and is detected at a predetermined facing distance in a direction in which the brake spring 7 extends further than the fixing nut 13. The switch 16 is disposed, and the detection switch 16 is attached and fixed to the end of the bracket 15 using a fixing screw 17.

  When the spring force of the brake spring 7 is reduced, the performance as an electromagnetic brake device is lowered. Therefore, it is desirable to monitor the spring force drop. This decrease in spring force is caused by the loosening of the fixing nut 13 and the adjusting nut 14 in the above-described configuration, and can be detected when the axial length of the brake spring 7 is increased. When the fixing nut 13 and the adjusting nut 14 are loosened, the receiving member 12 disposed at the right end of the braking spring 7 also moves to the right due to the restoring force of the braking spring 7 to return to the natural length. For this reason, the axial length of the brake spring 7 can be managed as the length from the reference surface to the receiving member 12 with the brake spring side end surface of the brake lever 6 as a reference surface, for example, as shown in FIG. The axial length of the braking spring 7 in a normal state is L.

  In a normal state, there is an initial facing distance between the fixing nut 13 located at the right end of the brake spring 7 and the detection switch 16, and therefore the detection switch 16 does not operate and is in the OFF state. is there. In order to detect an increase in the shaft length L in the brake spring 7, an allowable limit value (L + α) of the shaft length is set, and a detection switch when the shaft length in the brake spring 7 reaches the allowable limit value (L + α) 16 operates from the OFF state to the ON state. Here, the above-mentioned initial facing distance is set as α, and when the axial length of the braking spring 7 reaches the allowable limit value (L + α) as shown in FIG. 2, the loosened nut 13 sets the distance α to the right. The detection switch 16 is moved to contact the detection switch 16 so that the detection switch 16 is turned on.

  The increase in the axial length of the braking spring 7 in the electromagnetic braking device in the configuration of FIG. 1 is the movement of the fixing nut 13 in the loosening direction, the movement of the adjusting nut 14 in the loosening direction, or the spring receiving member 12 in the same direction. Therefore, when any one of these end fixing members moves a distance α in the extending direction of the brake spring 7 from the steady state position, the end member moves from the OFF state to the ON state. Thus, the detection switch 16 is arranged. When only the fixing nut 13 is loosened, the axial length of the braking spring 7 is not yet increased. However, after that, the adjustment nut 14 is in the same state as it is loosened. Even if this is detected, a decrease in the spring force of the brake spring 7 is detected in advance.

  As a specific configuration for this purpose, a bracket 15 that is sandwiched between the brake lever 6 and the left end of the brake spring 7 and extends to the right end side of the brake spring 7 is provided, and the right end of the brake spring 7 is provided. The detection switch 16 is arranged at a predetermined opposing distance α in a direction in which the brake spring 7 extends further than the fixing nut 13 existing on the side. For this reason, when the axial length of the braking spring 7 is extended, the facing distance between the fixing nut 13 and the detection switch 16 is reduced, and when the axial length of the braking spring 7 eventually reaches the allowable limit value (L + α), the fixing nut 13 is The detection switch 16 operates in an ON state by contact.

  When the axial length of the braking spring 7 managed in this way exceeds the allowable limit value (L + α), the detection switch 16 is turned on, so that the axial length of the managed braking spring 7 is the allowable limit value ( It can be detected by a signal from the detection switch 16 that it has increased until it exceeds (L + α). In addition, since this electric signal can be monitored at other appropriate locations, a decrease in the spring force of the brake spring 7 is detected without periodically measuring the axial length of the brake spring 7 that is actually managed. can do.

  As described above, the decrease in the spring force of the braking spring 7 is detected as the movement of the fixing nut 13 to the right. However, the movement of the adjusting nut 14 and the receiving member 12 in the same direction may be detected. The shaft of the braking spring 7 is not limited to the movement of the fixing nut 13 but the end fixing member fixed to the end of the braking spring 7 opposite to the brake lever, such as detecting the movement of the adjusting nut 14 or the receiving member 12. The same effect can be obtained by detecting the movement in the length increasing direction by the detection switch 16. In the above-described embodiment, the detection switch 16 is attached to the bracket 15 fixed to the reference surface side of the braking spring 7, and the movement of the end fixing member that moves as the axial length of the braking spring 7 increases is detected by the detection switch 16. Although it was made to detect, you may arrange | position both reversely. For example, when the detection switch 16 is attached to the end fixing member side and the end fixing member and the detection switch 16 are moved due to an increase in the axial length of the braking spring 7, one end becomes the reference plane side of the braking spring 7. The axial length of the brake spring 7 is set to an allowable limit value (L + α) at the other end of the bracket 15 fixed to the left end of the brake lever 6 or the brake spring 7 and the other end extending to the right end of the brake spring 7. ), A detection switch contact portion that contacts the detection switch 16 to turn on the detection switch 16 may be provided.

  However, like the former, the detection switch 16 is attached to the bracket 15 fixed to the reference surface side of the brake spring 7, and the detection switch 16 detects the movement of the end fixing member that moves due to the increase in the axial length of the brake spring 7. Then, since the end surface of the brake lever 6 may be used as the reference surface of the brake spring 7, the bracket 15 can be fixed to the free end side of the brake lever 6 by a known method without disassembling the brake spring 7. The operation of attaching the detection switch 16 to the existing electromagnetic braking device can be easily performed.

  Such an electromagnetic braking device for an elevator device detects a decrease in the spring force of the braking spring 7 when the axial length of the braking spring 7 is increased, and when the axial length of the braking spring 7 in a normal state is L. Since the permissible limit value (L + α) is set, and the detection switch 16 that operates when the permissible limit value (L + α) is reached, the spring force of the braking spring is directly measured as compared with the conventional method. Since it is not necessary to discriminate between the braking state and the release state, it is possible to reliably detect an abnormality with a simple configuration.

  Further, the electromagnetic braking device for an elevator apparatus described above detects a decrease in the spring force of the braking spring 7 as the movement of the end fixing member on the anti-brake lever side of the braking spring 7, and Since the detection switch 16 is opposed to the end fixing member in the extending direction of the braking spring 7 in the extending direction, no erroneous detection is performed in either the braking state or the release state, and simply by the operation signal of the detection switch 16. A decrease in spring force of the brake spring 7 can be detected. Further, unlike the conventional method of directly measuring the spring force of the brake spring, it is not necessary to disassemble the brake spring 7 for mounting the detector, so that the mounting operation of the detection switch 16 is simplified. be able to.

  FIG. 3 is a side view showing an electromagnetic braking device according to another embodiment of the present invention. The same reference numerals are given to the equivalent parts to those of the previous embodiment, and detailed description thereof is omitted. In the previous embodiment, the fixing nut 13 that has been loosened and moved to the right is detected by the detection switch 16, but the end of the brake spring rod 11 is also located in the vicinity of the fixing nut 13. Therefore, it is necessary to arrange the detection switch 16 so as to detect the movement of the fixing nut 13 while avoiding the brake spring rod 11, and there is a concern that the position adjustment of the detection switch 16 becomes difficult. Therefore, instead of directly detecting the movement of the fixing nut 13, the receiving member 12 also moves to the right when the fixing nut 13 and the adjusting nut 14 are loosened. One end of the arm portion 18 is connected to the other end of the arm portion 18, and the other end of the arm portion 18 is opposed to the detection switch 16 with a predetermined distance as described above. When the detection switch 16 is attached to an existing electromagnetic braking device, it is desirable to attach the arm portion 18 to the receiving member 12 by a known fixing method without disassembling the braking spring 7.

  According to such a configuration, the detection switch 16 needs to be arranged in a delicate positional relationship as in the case of directly detecting the movement of the fixing nut 13 while avoiding the brake spring rod 11 or the like located in the vicinity. Therefore, the detection switch 16 can be arranged at an arbitrary position where the workability is good and there is no malfunction. Similarly to the above-described embodiment, a decrease in the spring force of the brake spring 7 is detected as a movement of the brake spring 7 on the anti-brake lever side, and the brake spring 7 is separated from the anti-brake lever side by a predetermined distance. Since the detection switch 16 is arranged oppositely at the position, the same effect as in the previous embodiment can be obtained.

  The electromagnetic braking device according to the present invention is not limited to the configuration shown in FIGS. 1 and 4 and can be applied.

DESCRIPTION OF SYMBOLS 1 Riding car 2 Balance weight 3 Main rope 4 Hoisting machine 5 Brake drum 6 Brake lever 7 Brake spring 8 Electromagnetic release device 9 Brake shoe 10 Rotating shaft 11 Brake spring rod 12 Receiving member 13 Fixing nut 14 Adjustment nut 15 Bracket 16 Detection switch 17 Fixing screw 18 Arm

Claims (4)

A brake drum, a brake lever that presses a brake shoe against the brake drum, a brake spring that has one end acting on the brake lever so as to apply a pressing force to the brake drum, and a central portion of the brake spring. Electromagnetic braking comprising: an arranged brake spring rod; and an end fixing member fixed to the end of the brake spring rod located on the other end side of the brake spring in a state where the brake spring is arranged on the brake spring rod In the device
An electromagnetic brake device comprising: a detection switch that operates by detecting a position of the end fixing member when the allowable limit value of the axial length of the brake spring is set and the allowable limit value is reached.   A bracket that is fixed to the one end side of the brake spring and extended to the other end side of the brake spring is provided, and the other end side of the brake spring in the bracket is more than the end fixing member of the brake spring. 2. The electromagnetic brake device according to claim 1, further comprising a detection switch mounted at a predetermined facing distance in a direction in which the brake spring extends.   An arm portion is provided on the other end side of the braking spring, and the detection switch is arranged opposite to the arm portion so as to detect a decrease in spring force of the braking spring from a change in position of the arm portion. The electromagnetic braking device according to claim 1. The car and the counterweight are connected by a main rope, and the car is moved up and down by a hoisting machine around which the main rope is wound, and the hoisting machine drives to drive a sheave around which the main rope is wound. A brake drum, a brake lever that presses a brake pad against the brake drum, and an end on the brake lever so as to apply a pressing force to the brake drum. A brake spring disposed at the center of the brake spring, and the brake spring rod positioned on the other end of the brake spring with the brake spring disposed on the brake spring rod. In an elevator apparatus equipped with an electromagnetic braking device composed of an end fixing member fixed to an end,
An electromagnetic braking device comprising a detection switch that sets an allowable limit value of the axial length of the brake spring and detects the position of the end fixing member when the allowable limit value is reached. Elevator equipment equipped.

Images