JP2013079121A - Brake device of elevator hoisting machine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a brake device of an elevator hoisting machine in which the progress of wear in a friction member in the brake device of the elevator hoisting machine can be monitored easily at an observation post without going to an installation location of the brake device.SOLUTION: The brake device of the elevator hoisting machine includes: a brake drum that is rotatably provided and braked; the friction member that has a friction surface and a holding surface opposite to the friction surface, and is displaced to a position where the friction surface is pressed against the brake drum and a position where the friction surface is spaced from the brake drum so that the holding surface is at a predetermined position; a switch and wear condition determination unit for generating a signal that a shifted distance increases by a predetermined dimension in association with a displaced distance between the friction surface and the holding surface by the predetermined dimension by the wear of the friction member when the friction surface is pressed against the rotating brake drum; and a communication unit for receiving the signal to report it to the observation post provided at a remote position from the friction member.

Description

The present invention relates to an elevator hoisting machine brake device, and more particularly to an elevator hoisting machine brake device equipped with a device for monitoring the progress of wear of a friction member.

In an elevator hoisting brake device, a drum-like or disc-like braked member is rotatably provided integrally with a sheave on which a car is suspended via a main rope, and a friction member is provided on the braked member. The car is stopped and held by pressing the lining to generate frictional force and braking the rotation of the braked member. Further, when the lining is separated from the braked member, the braked member is released and can be rotated, and the car can be raised and lowered.

By the way, when the lining is pressed against the rotating braked member, the lining is worn and thinned. Therefore, in order to generate a stable friction force and brake, the thickness of the lining is measured at the time of maintenance of the elevator, and the lining is replaced when it becomes thin to the reference thickness.
In addition, there is one in which a solid dye is embedded at the position of the replacement reference thickness of the lining so that it can be seen that the thickness has been reduced to the replacement reference thickness without measuring the thickness of the lining. As a result, when the lining is thinned to the replacement reference thickness, the solid dye adheres to the brake drum.
(For example, see Patent Document 1)

JP 7-269617 (3rd page, FIG. 1)

However, in order to measure the thickness of the lining or confirm the presence or absence of solid dye, it is necessary for a maintenance person to go to the place where the brake device is installed. On the other hand, the progress of lining wear depends on the operating frequency of the brake device, that is, the frequency of use of the elevator, and is difficult to predict. It was.

The present invention has been made to solve such a problem, and can easily monitor the progress of wear of the friction member of the brake device of the elevator hoisting machine at a monitoring station without going to the installation site of the brake device. It aims at obtaining the brake device of the hoisting machine for elevators.

A brake device for an elevator hoist according to the present invention includes a braked member that is rotatably provided and braked, a friction surface and a holding surface opposite to the friction surface, and the friction surface is a braked member. The friction surface is pressed against the rotating braked member, the friction member being displaced to the position pressed against the frictional surface and the position where the friction surface is separated from the braked member so that the holding surface is in a predetermined position. And detecting means for generating a signal when the displaced distance increases by a predetermined dimension as the friction member wears and the distance between the friction surface and the holding surface is shortened by a predetermined dimension. And a reporting means for reporting to a friction member and a monitoring station provided at a remote location.

According to the present invention, the friction member displaces the position where the friction surface is pressed against the braked member and the position where the friction surface is separated from the braked member so that the holding surface is at a predetermined position. That is, the friction member is displaced from the position where the friction surface is pressed against the braked member to the position where the friction surface is pulled away from the braked member so that the holding surface is at a predetermined position. The friction surface is displaced from the position where the friction surface is separated from the member to be braked to a predetermined position to the position where the friction surface is pressed against the member to be braked.
The distance between the friction surface and the braked member in a state where the friction surface is separated from the braked member so that the holding surface is in a predetermined position is the distance at which the friction member is displaced.

By the way, when the friction surface of the friction member is pressed against the rotating braked member, the friction member is worn, and the distance between the friction surface and the holding surface of the friction member is shortened by a predetermined dimension. For this reason, the position of the friction surface in a state in which the friction surface is separated from the member to be braked so that the holding surface is in a predetermined position is closer to the holding surface by a predetermined dimension than before the wear. The distance between the friction surface and the member to be braked, that is, the distance by which the friction member is displaced is increased by a predetermined dimension. That is, as the distance between the friction surface and the holding surface is shortened by a predetermined dimension due to wear, the distance that the friction member is displaced increases by a predetermined dimension, so that the detection means generates a signal. Upon receiving this signal, the reporting means reports to a monitoring station provided at a position remote from the friction member. Thereby, the progress of wear of the friction member of the brake device of the elevator hoisting machine can be easily monitored at a monitoring station without going to the place where the brake device is installed.

According to the present invention, there is obtained a brake device for an elevator hoisting machine that can easily monitor the progress of wear of a friction member of a brake device of an elevator hoisting machine at a monitoring station without going to the place where the brake apparatus is installed. be able to.

It is a figure which shows the whole structure of the brake device of the winding machine for elevators of the state by which the brake device which concerns on Embodiment 1 of this invention was released. BRIEF DESCRIPTION OF THE DRAWINGS It is a figure which shows the whole structure of the brake device of the elevator hoisting machine of the state by which the brake device which concerns on Embodiment 1 of this invention was braked. It is an enlarged view which shows the brake drum and shoe vicinity of FIG. It is a figure which shows arrangement | positioning of the switch of the shoe back part seen from the arrow A and arrow B of FIG. It is a figure which shows the whole structure of the brake device of the winding machine for elevators of the state by which the brake device which concerns on Embodiment 2 of this invention was released. FIG. 6 is a partially enlarged view showing the vicinity of a drive braking unit in FIG. 5. FIG. 6 is a cross-sectional view showing a cross section CC in FIG. 5. It is a figure which shows the whole structure of the brake device of the winding machine for elevators of the state by which the brake device which concerns on Embodiment 3 of this invention was braked.

Embodiment 1 FIG.
A first embodiment of the present invention will be described with reference to FIGS. FIG. 1 is a diagram showing an overall configuration of a brake device for an elevator hoist according to Embodiment 1 of the present invention, and shows a state in which the brake device is released. FIG. 2 is a diagram showing an overall configuration of the brake device of the elevator hoisting machine according to Embodiment 1 of the present invention, and shows a state where the brake device is braked. FIG. 3 shows an enlarged view of the vicinity of the brake drum and shoe of FIG. FIG. 4 is a view as seen from arrow A and arrow B in FIG. 3 and shows the arrangement of the switch on the back of the shoe.

1 and 2, a rotating shaft 4 is fixed through a central portion of a brake drum 3 serving as a cylinder-shaped braked member. A driving sheave (not shown) for suspending an elevator car (not shown) is also fixed to the rotating shaft 4. The rotating shaft 4 is rotatably supported by the main body 5. A pair of arms 7 and 7 are provided vertically on both sides of the brake drum 3 in the radial direction. The arm 7 is attached to the main body 5 so that a lower end portion thereof can be rotated by a shaft 7a.

A shoe 9 is attached as a holding member to the surface of the arm 7 facing the brake drum 3 in the longitudinal direction, and a lining 8 as a friction member is attached to the shoe 9. The lining 8 is formed in a curved cross section so that a rectangular plate member extends along the outer peripheral surface 3 a of the brake drum 3. As shown in FIG. 3, the lining 8 is attached to the shoe 9 so that the holding surface 8 b, which is a curved outer peripheral surface, contacts the shoe 9. The surface opposite to the holding surface 8b, that is, the friction surface 8a which is the curved inner peripheral surface is pressed against the outer peripheral surface 3a of the brake drum 3 as shown in FIG. 1, and as shown in FIG. The lining 8 is displaced from the position separated from each other. When the lining 8 is pressed against the rotating brake drum 3, the friction surface 8a is rubbed against the outer peripheral surface 3a and the lining 8 is worn.

A through hole 7c is provided above the shoe 9 mounting portion of the arm 7, and the through hole 7c is provided so as to have an opening on the surface of the arm 7 on the brake drum 3 side and the opposite surface. Yes. The shaft portion 11b of the spring receiver 11 is inserted into the through hole 7c, the base end portion of the shaft portion 11b is fixed to the main body 5, and the disk-shaped spring receiver portion 11a is provided at the distal end portion. The spring 10 is sandwiched between the spring receiving portion 11a and the arm 7 in a compressed state, and the arm 7 is attached to rotate around the shaft 7a toward the brake drum 3 by the restoring force of the spring 10. It is energized. In FIG. 2, the lining 8 is pressed against the brake drum 3 through the shoe 9 attached to the arm 7 by this urging force, and the brake drum 3 is braked.

At the upper end portion of the arm 7, a projection 7b protruding toward the brake drum 3 is provided. The main body 5 in the vicinity of the protruding portion 7b is provided with a lever 12 having a “h” shape, and an intermediate portion of the lever 12 is attached to the main body 5 so as to be swingable by a shaft 12c. The lever 12 is provided with a side surface 12b facing the protrusion 7b and an upper surface 12a facing substantially upward of the lever 12. And the front-end | tip part of the projection part 7b rocks the lever 12 with the urging | biasing force of the spring 10, and the side surface 12b is pushed so that the upper surface 12a may go up.

An electromagnetic magnet 15 is provided above the main body 5. The electromagnetic magnet 15 is provided with a cylindrical electromagnetic coil 16 in a case 18. The electromagnetic coil 16 is provided with a hollow portion 16a in the vertical direction, and further, a plunger 17 is provided so as to be movable up and down along the hollow portion 16a. When the plunger 17 moves to the lower part of the hollow portion 16a, the lower surface 17a of the plunger 17 contacts the case bottom surface 18a. The lower surface 17a is provided with a push bar 17b projecting downward, and the push bar 17b projects from a hole 18b provided at the center of the case bottom surface 18a. The tip of the push rod 17b is in contact with the upper surface 12a of the lever 12. When the plunger 17 is above the hollow portion 16a, the upper surface 12a of the lever 12 faces downward so that the push rod 17b swings the lever 12 due to the weight of the plunger 17 and the side surface 12b presses the tip of the projection 7b. Is pressed.

Thus, the urging force of the spring 10 and the weight of the plunger 17 act so as to swing the lever 12 in opposite directions. As shown in FIG. 2, the urging force of the spring 10 lifts the plunger 17 from the case bottom surface 18a against the dead weight of the plunger 17 and holds it on the upper portion of the hollow portion 16a. The brake drum 3 is sized so as to be pressed against the brake drum 3. Further, as shown in FIG. 1, when a current is supplied to the electromagnetic coil 16 from a power source (not shown) and the electromagnetic coil 16 is excited, the plunger 17 is moved downward by the magnetic force, and the lever is moved by the tip of the push rod 17b. When the upper surface 12a of 12 is pushed downward, the lever 12 is swung against the urging force of the spring 10. As a result, the arm 7 is rotated away from the brake drum 3 via the protrusion 7b that is in contact with the side surface 12b, and the lining 8 is pulled away from the brake drum 3 so that the brake drum 3 can rotate.

1 to 4, four switches 21 to 24 for one shoe and a wear condition determination unit 30 connected to the switches 21 to 24 and the lead wire 19 are provided as detection means. When the signals generated by the switches 21 to 24 are received, the wear state determination unit 30 is set in advance to determine that the lining 8 has been worn by a predetermined dimension. And it is connected to the monitoring station 32 provided in the lining 8 and the remote position via the communication part 31 and the communication line 35 as a notification means from the abrasion condition determination part 30. FIG. Further, the wear state determination unit 30 is connected to a display 33 and an elevator operation control unit 34 as display means provided in a machine room (not shown) in the vicinity of the lining 8, for example, in which the hoist 1 is installed. ing.

In FIGS. 3 and 4, two strip-shaped fixtures 25, 25 are fixed to the back of the shoe 9 with bolts 26, and switches 21 and 22 are fixed to both ends of one fixture 25. The switch 23 and the switch 24 are fixed to both ends of the other fixture 25. The switches 21 to 24 are arranged so as to be positioned in the vicinity of the four corners of the lining 8. That is, the switches 21 and 23 and the switches 22 and 24 are arranged so as to be separated from each other in the direction in which the friction surface 8a is rubbed with the outer peripheral surface 3a. Further, the switches 21 and 22 and the switches 23 and 24 are arranged so as to be separated from each other in the lateral direction with respect to the direction in which the friction surface 8a rubs against the outer peripheral surface 3a. In addition, since the fixture 25 to which the switches 21 to 24 are attached is attached to the shoe 9 by the bolt 26, when the lining 8 is worn and the shoe 9 is replaced, the bolt 26 is loosened to remove the old shoe 9. The switches 21 to 24 are removed together with the fixture 25, and the switches 21 to 24 are attached together with the fixture 25 to the new shoe 9 with bolts 26.

In FIG. 3, the switch 21 is provided on a switch main body 21 a attached to a fixture 25 so that a movable shaft 21 b, a roller 21 d, and a shaft 21 c as contact portions are positioned in the vicinity of the lining 8. The movable shaft 21b is provided so as to protrude from the switch body 21a toward the brake drum 3. A roller 21d is provided at the tip of the movable shaft 21b so as to be rotatable by the shaft 21c. When the roller 21d comes into contact with the brake drum 3, a signal is generated by the switch 21 and is sent to the wear state determination unit 30. It has become. The roller 21d can rotate together with the brake drum 3 when it comes into contact with the rotating brake drum 3. When the roller 21d comes into contact with the brake drum 3 at a predetermined pressing force or more, the movable shaft 21b is pushed into the switch body 21a while the roller 21d and the brake drum 3 are in contact.

In addition, the material of the roller 21d is the same material as the material of the brake drum 3, or a material whose hardness is smaller than the material of the brake drum 3. The comparison of hardness is performed by, for example, Brinell hardness, Vickers hardness, Rockwell hardness, Shore hardness, and the like. For example, when the material of the brake drum 3 is cast iron, the material of the roller 21d is cast iron or synthetic resin.

Similarly to the switch 21, the switches 22 to 24 are provided with movable shafts 22b to 24b in the switch bodies 22a to 24a, respectively, and rollers 22d to 22c are rotatable at the distal ends of the movable shafts 22b to 24b, respectively. 24d is provided. When the rollers 22d to 24d come into contact with the brake drum 3, signals are generated by the switches 22 to 24 and sent to the wear state determination unit 30, respectively. Further, when the rollers 22d to 24d come into contact with the brake drum 3 at a predetermined pressing force or more, the movable shafts 22b to 24b are respectively placed in the switch bodies 22a to 24a while the rollers 22d to 24d and the brake drum 3 are in contact with each other. It is supposed to be pushed. The materials of the rollers 22d to 24d are the same as the material of the roller 21d.

In FIG. 3, for example, a lining 8 having a thickness T of the lining 8 is attached to the friction surface 8 a and the holding surface 8 b in a state where the new lining is not worn, and the lining 8 is pulled away from the brake drum 3. Shows the state. Assuming that the distance between the friction surface 8a of the lining 8 and the outer peripheral surface 3a of the brake drum 3 is S, the position pressed against the brake drum 3 and the position separated when the lining 8 is not worn. The distance by which the lining 8 is displaced is S.

By the way, as shown by a one-dot chain line in the lining 8 of FIG. 3, for example, the lining 8 is worn and the thickness is reduced by T / 3 as a predetermined dimension, and the remaining thickness becomes 2T / 3. Thickness. The switches 21 and 24 are attached so that the positions of the rollers 21d and 24d are T / 3 as a predetermined dimension from the friction surface 8a toward the holding surface 8b. In this case, the distance between the rollers 21d and 24d and the outer peripheral surface 3a is S + T / 3.
Further, as shown by a two-dot chain line in the lining 8 of FIG. 3, for example, the lining 8 is worn and the thickness is reduced to 2T / 3 as a predetermined dimension, and the remaining thickness is changed to T / 3. The thickness of the alarm is assumed. The switches 22 and 23 are attached so that the positions of the rollers 22d and 23d are 2T / 3 as a predetermined dimension from the friction surface 8a toward the holding surface 8b. In this case, the distance between the rollers 22d and 23d and the outer peripheral surface 3a is S + 2T / 3.

3 and FIG. 4, when the shoe 9 is viewed from the back, the switches 21 and 24 attached to the S + T / 3 with the distance between the rollers 21d and 24d and the outer peripheral surface 3a are the shoes 9, that is, the lining 8 It is arranged in the position which becomes a diagonal among four corners. Further, the switches 22 and 23 having the distance between the rollers 22d and 23d and the outer peripheral surface 3a of S + 2T / 3 are also arranged at diagonal positions among the four corners of the lining 8.

The operation of the elevator hoisting machine brake device configured as described above will be described. As shown in FIG. 1, when the electromagnetic coil 16 is excited, the plunger 17 is moved downward by the magnetic force, and the lower surface 17a contacts the case bottom surface 18a. The push rod 17b pushes the upper surface 12a of the lever 12 downward to swing the lever 12, and the side surface 12b of the lever 12 separates from the brake drum 3 by pushing the projection 7b against the urging force of the spring 10. The arm 7 is rotated in the direction. Accordingly, the lining 8 is separated from the brake drum 3 so that the brake drum 3 can be rotated.

Next, as shown in FIG. 2, when the excitation of the electromagnetic coil 16 is released, the attractive force disappears, and the projection 7b pushes the side surface 12b of the lever 12 by the biasing force of the spring 10, and the upper surface 12a moves the push bar 17b upward. The plunger 17 is lifted up from the case bottom surface 18a and held on the upper portion of the hollow portion 16a. Further, the urging force of the spring 10 rotates the arm 7 toward the brake drum 3 to press the lining 8 against the brake drum 3 to brake the brake drum 3. In this way, the brake device 2 is released or braked.

In a state where the lining 8 is pulled away from the brake drum 3, the lower surface 17a of the plunger 17 is in contact with the case bottom surface 18a. The case bottom surface 18a is always at the same position. For this reason, the position of the holding surface 8b of the lining 8 in this state is always the same predetermined position. In this way, the lining 8 displaces the position where the holding surface 8b is always separated from the brake drum 3 at the same predetermined position and the position where the friction surface 8a is pressed against the brake drum 3. The distance between the friction surface 8a and the brake drum 3 in a state where the lining 8 is separated from the brake drum 3 is a distance at which the lining 8 is displaced. Since the lining 8 is displaced in this manner, the distance by which the lining 8 is displaced is also constant when it is not worn, that is, when the distance between the friction surface 8a and the holding surface 8b is constant.

By the way, when the lining 8 is pressed against the rotating brake drum 3, the friction surface 8a is rubbed against the outer peripheral surface 3a and the lining 8 is worn. For example, when the lining 8 is worn to the expected replacement thickness, the distance between the friction surface 8a and the holding surface 8b is shortened by T / 3 as a predetermined dimension. In the state where the lining 8 is separated from the brake drum 3, the position of the holding surface 8b is always at the same predetermined position. Therefore, the position of the friction surface 8a in this state is a predetermined value compared with that before the wear. The holding surface 8b at the position approaches T / 3. As a result, the distance between the friction surface 8a and the outer peripheral surface 3a increases by T / 3. Accordingly, the distance by which the lining 8 is displaced increases by T / 3 as a predetermined dimension and becomes S + T / 3.

On the other hand, the switches 21 and 24 are attached so that the distance between the rollers 21d and 24d and the outer peripheral surface 3a is S + T / 3 in a state where the lining 8 is separated from the brake drum 3. For this reason, when the lining 8 is pressed against the brake drum 3, the rollers 21d and 24d abut against the outer peripheral surface 3a, and the switches 21 and 24 generate signals. While the brake drum 3 is rotating, the rollers 21d and 24d also rotate together.

Upon receiving the signals generated by the switches 21 and 24, the wear state determination unit 30 determines that the wear has progressed to the replacement predicted thickness, and signals the display 33 to display that the lining 8 has been worn to the replacement predicted thickness. In addition, the communication unit 31 notifies the monitoring station 32 via the communication line 35 that the lining 8 has been worn to the replacement forecast thickness. At the stage where the wear has progressed to the replacement forecast thickness, the elevator operates as usual, so no signal is sent to the elevator operation control unit 34.

When the wear further progresses, for example, when the lining 8 is worn to the replacement alarm thickness, the distance between the friction surface 8a and the holding surface 8b is shortened by 2T / 3 as a predetermined dimension. In the state where the lining 8 is separated from the brake drum 3, the position of the holding surface 8b is always at the same predetermined position. Therefore, the position of the friction surface 8a in this state is a predetermined value compared with that before the wear. The holding surface 8b at the position approaches 2T / 3. Along with this, the distance between the friction surface 8a and the outer peripheral surface 3a increases by 2T / 3 as a predetermined dimension. Accordingly, the distance by which the lining 8 is displaced increases by 2T / 3 as a predetermined dimension and becomes S + 2T / 3.

On the other hand, the switches 22 and 23 are attached so that the distance between the rollers 22d and 23d and the outer peripheral surface 3a is S + 2T / 3 in a state where the lining 8 is separated from the brake drum 3. For this reason, when the lining 8 is pressed against the brake drum 3, the rollers 22d and 23d abut against the outer peripheral surface 3a, and the switches 22 and 23 generate signals. While the brake drum 3 is rotating, the rollers 22d and 23d also rotate together.

Upon receipt of the signals generated by the switches 22 and 23, the wear state determination unit 30 determines that the wear has progressed to the replacement alarm thickness and sends a signal to the elevator operation control unit 34. Then, the elevator operation control unit 34 causes the elevator car ( Stop at a safe landing (not shown). In addition, a signal is sent to the display 33 to indicate that the lining 8 has been worn to the replacement alarm thickness, and the lining 8 has been worn to the monitoring station 32 from the communication unit 31 via the communication line 35. Report that.

In the above description, the lining 8 is uniformly worn over the entire friction surface 8a, and the thickness of the lining 8 is uniformly reduced. However, the amount of wear differs depending on the location of the friction surface 8a. There is also. In this case, the determination of replacement of the lining 8 is performed in a place where the amount of wear is large. For example, if the switches 21 and 22 have a larger amount of wear than the switches 23 and 24, the thickness of the lining 8 is reduced by T / 3, and the distance that the lining 8 is displaced is increased by T / 3, so that S + T / When it becomes 3, the wear state determination unit 30 determines that wear has progressed to the replacement forecast thickness based on the signal generated by the switch 21 and sends a signal. Further, when the thickness of the lining 8 is reduced by 2T / 3 and the distance that the lining 8 is displaced is increased by 2T / 3 to become S + 2T / 3, the wear state determination unit 30 generates a replacement alarm by a signal generated by the switch 22. It is judged that the wear has progressed to the thickness, and a signal is sent.

Further, for example, even when the amount of wear on the switch 21 and 23 side is larger than that on the switch 22 and 24 side, the wear state determination unit 30 similarly determines that the wear has progressed to the replacement forecast thickness based on the signal generated by the switch 21. In addition, the wear state determination unit 30 determines that wear has progressed to the replacement alarm thickness based on the signal generated by the switch 23, and sends the signal.

The elevator hoisting machine brake device configured as described above is configured such that the friction surface 8a is pressed against the outer peripheral surface 3a of the brake drum 3 rotatably provided, and the holding surface 8b is in a predetermined position. As the lining 8 that displaces the position where the friction surface 8a is separated from the outer peripheral surface 3a is worn, and the distance between the friction surface 8a and the holding surface 8b is shortened by a predetermined dimension, the displacement distance is predetermined. By increasing the size, the rollers 21d to 24d provided at the distal ends of the movable shafts 21b to 24b of the switches 21 to 24 come into contact with the outer peripheral surface 3a, and the switches 21 to 24 generate signals, so that the wear state determination unit At 30, it is determined that a predetermined dimension has been worn, and the communication unit 31 notifies the monitoring station 32 via the communication line 35. Therefore, the progress of wear of the lining 8 can be easily monitored at the monitoring station 32 without going to the place where the brake device 2 is installed.

In addition, when the lining 8 is worn and thinned by a predetermined dimension, two dimensions are set as the predetermined dimension that the switches 21 to 24 generate signals. That is, the switches 21 and 24 are provided so that a signal is generated when the lining 8 is worn to the replacement expected thickness, and the monitoring station 32 is notified, and the switches 22 and 23 are signaled when the lining 8 is worn to the replacement alarm thickness. It is provided so that it can be generated and reported to the monitoring station 32. As a result, the lining 8 may be replaced between the time when it is reported that the wear has progressed to the replacement forecast thickness and the time when it is reported that the wear has progressed to the replacement alarm thickness. For example, together with other maintenance work Maintenance work such as replacing the lining 8 can be performed efficiently.

Further, when the lining 8 is worn and thinned by a predetermined dimension, the predetermined dimension that the switches 21 to 24 generate signals is set with two dimensions, and further, the switch set to the same dimension. 21 and 24 are arranged at the diagonal positions, and switches 22 and 23 are arranged at the four corners of the lining 8 so as to be at the diagonal positions. In other words, the diagonally located switches 21 and 24 are provided so that a signal is generated when the lining 8 is worn down to the replacement forecast thickness and notified to the monitoring station 32, and the oppositely located switches 22 and 24 are provided. 23 is provided so that a signal is generated when the lining 8 is worn down to the replacement alarm thickness and is notified to the monitoring station 32.

Therefore, even if the amount of wear differs depending on the location of the friction surface 8a of the lining 8, when the lining 8 reaches the replacement forecast thickness, one of the switches 21 and 24 generates a signal, and then the replacement warning thickness is reached. When this is reached, one of the switches 22, 23 generates a signal and is notified. For this reason, even if the amount of wear varies depending on the location of the friction surface 8a, the progress of the wear of the lining 8 can be easily monitored at the monitoring station 32 without going to the installation location of the brake device 2.

In addition, since the display 33 indicates that the lining 8 has been worn to the replacement expected thickness, or the lining 8 has been worn to the replacement alarm thickness, the maintenance staff who is performing maintenance work at the installation site of the hoisting machine 1 displays the display. It is possible to easily grasp the progress of wear of the lining 8 simply by looking at 33.

When the lining 8 is worn to the replacement expected thickness or the replacement warning thickness, the rollers 21d to 24d come into contact with the outer peripheral surface 3a of the brake drum 3 and rotate together with the brake drum 3. Thereby, the material of the rollers 21d to 24d hardly adheres to the outer peripheral surface 3a and does not affect the friction coefficient of the outer peripheral surface 3a, so that the braking force of the brake device 2 can be obtained stably. The material of the rollers 21d to 24d is the same as the material of the brake drum 3 or a material having a hardness smaller than the material of the brake drum 3. Accordingly, the rollers 21d to 24d do not damage the outer peripheral surface 3a and do not affect the friction coefficient of the outer peripheral surface 3a, so that the braking force of the brake device 2 can be obtained stably.

Further, when the lining 8 has been worn down to the replacement alarm thickness and the wear state determination unit 30 determines that the signal is sent to the elevator operation control unit 34, the elevator operation control unit 34 places the elevator car (not shown) in a safe place. To stop. For this reason, for example, the safety of the elevator can be ensured even if the usage frequency of the elevator increases rapidly and the wear progresses to the replacement alarm thickness before the lining 8 is replaced.
Further, since the switches 21 to 24 can be attached to the shoe 9 with the bolts 26 via the attachments 25, the apparatus for monitoring the progress of wear according to the present invention is greatly modified to the already installed brake device 2. Can be added easily without having to

Embodiment 2. FIG.
A second embodiment of the present invention will be described with reference to FIGS. FIG. 5 is a diagram showing an overall configuration of a brake device for an elevator hoist according to Embodiment 2 of the present invention, and shows a state in which the brake device is released. FIG. 6 is a partially enlarged view showing the vicinity of the drive braking portion of FIG. 5, and shows a state where the brake device is released. FIG. 7 is a sectional view showing a section CC of FIG.

5-7, the rotating shaft 104 is being fixed through the center part of the brake disc 103 as a disk-shaped to-be-braking member. A driving sheave (not shown) for suspending an elevator car (not shown) is fixed to the rotating shaft 104 and is rotatably supported by a hoisting machine main body (not shown). The outer peripheral edge of the brake disc 103 is inserted into a groove 113a of the drive braking unit main body 113 having a substantially concave shape. A pair of drive braking portions 100, 100 are provided on the groove inner walls 113b, 113b facing each other with the brake disc 103 interposed therebetween. A fixed iron core 118 of the drive braking unit 100 is attached to the groove inner wall 113b, and a movable iron core 117 is provided on the brake disk 103 side of the fixed iron core 118 so as to be able to advance and retreat to the brake disk 103 side.

An electromagnetic coil 116 is embedded in a portion of the fixed iron core 118 opposite to the movable iron core 117, and a hole 118a for inserting a spring 110 for urging the movable iron core 117 toward the brake disk 103 is provided. The spring 110 has a proximal end inserted into the hole 118 a and a distal end abutted against the movable iron core 117. When a current is supplied from a power source (not shown) to the electromagnetic coil 116 to excite the electromagnetic coil 116, the movable iron core 117 is attracted to the electromagnetic coil 116 side against the biasing force of the spring 110 and comes into contact with the fixed iron core 118. When the current is interrupted and the excitation of the electromagnetic coil 116 is released, the attractive force is lost and the movable iron core 117 is separated from the fixed iron core 118 and is urged toward the brake disk 103.

A lining 108 as a friction member is attached to the movable iron core 117 via a shoe 109 so as to face the brake disk 103. The lining 108 is attached to the shoe 109 at the holding surface 108b, and the friction surface 108a, which is the surface opposite to the holding surface 108b, faces the brake disc 103 so as to be able to contact and separate. As the movable iron core 117 is urged toward the brake disk 103 by the spring 110, or is attracted to the electromagnetic coil 116 excited against the urging force of the spring 110, it comes into contact with the fixed iron core 118. The lining 108 is displaced together with the shoe 109 and the movable iron core 117 between the position where the friction surface 108 a is pressed against the brake disc 103 and the position where the friction surface 108 a is separated.

When the lining 108 is pressed against the brake disc 103, the brake disc 103 is braked. When the lining 108 is pulled away from the brake disc 103, the brake disc 103 becomes rotatable. When the lining 108 is pressed against the rotating brake disc 103, the friction surface 108a is rubbed against the brake disc 103 and the lining 108 is worn.

As a detection means, two switches 121 and 121 for one movable iron core 117 and a wear state determination unit 130 connected to each switch 121 by a lead wire 119 are provided. Two switches 121 and 121 provided on one movable iron core 117 are respectively attached to both side surfaces of the movable iron core 117 so that the friction surface 108a is disposed away from the brake disk 103 in a rubbing direction. Then, the lining 108 is connected to a monitoring station 132 provided at a remote position via a communication unit 131 as a notification means from the wear state determination unit 130 and a communication line 135.

The switch 121 is provided on a switch main body 121 a attached to the movable iron core 117 so that a movable shaft 121 b as a contact portion and a roller 121 c are positioned in the vicinity of the lining 108. The roller 121c is rotatably provided at the tip of the movable shaft 121b by a shaft (not shown). The movable shaft 121 b is provided so as to protrude from the switch body 121 a toward the brake disk 103, and a signal generated when the roller 121 c at the tip end comes into contact with the brake disk 103 is sent to the wear state determination unit 130. The wear state determination unit 130 is set in advance so as to determine that the lining 108 has been worn to the replacement reference thickness when the signal generated by the switch 121 is received. When abutting against the rotating brake disc 103, the roller 121 c rotates together with the brake disc 103.

When the roller 121c contacts the brake disc 103 with a predetermined pressing force or more, the movable shaft 121b is pushed into the switch body 121a while the roller 121c and the brake disc 103 are in contact. The material of the roller 121c is the same as the material of the brake disc 103, or a material having a hardness smaller than the material of the brake disc 103. The comparison of hardness is performed by, for example, Brinell hardness, Vickers hardness, Rockwell hardness, Shore hardness, and the like. For example, when the material of the brake disk 103 is cast iron, the material of the roller 121c is cast iron or synthetic resin.

5 and 6, for example, the distance between the friction surface 108a and the holding surface 108b, that is, the lining 108 having a thickness G of the lining 108 is attached in a state where the new lining is not worn. The separated state is shown. When the distance between the friction surface 108a of the lining 108 and the brake disk 103 is F, the lining 108 is displaced between the position pressed against the brake disk 103 and the position released when the lining 108 is not worn. The distance to do is F.

By the way, for example, a state where the lining 108 is worn and the thickness is reduced to G / 2 as a predetermined dimension and the remaining thickness is G / 2 is set as the replacement reference thickness. The switch 121 is attached so that the roller 121c is positioned at G / 2 as a predetermined dimension from the friction surface 108a toward the holding surface 108b. In this case, the distance between the roller 121c and the brake disk 103 is F + G / 2.

The operation of the elevator hoisting machine brake device configured as described above will be described. When the electromagnetic coil 116 is excited, the movable iron core 117 is attracted toward the electromagnetic coil 116 against the biasing force of the spring 110 and abuts against the fixed iron core 118. As a result, the lining 108 moves away from the brake disc 103, and the brake disc 103 can be rotated. Next, when the excitation of the electromagnetic coil 116 is released, the lining 108 is pressed against the brake disc 103 through the movable iron core 117 and the shoe 109 by the biasing force of the spring 110, and the brake disc 103 is braked. In this way, the brake device 102 is released or braked.

When the lining 108 is separated from the brake disk 103, the movable iron core 117 is in contact with the fixed iron core 118. And the fixed iron core 118 is always in the same position. For this reason, the position of the holding surface 108b of the lining 108 in this state is always the same predetermined position. In this way, the lining 108 displaces the position where the holding surface 108b is always separated from the brake disk 103 at the same predetermined position and the position where the friction surface 108a is pressed against the brake disk 103. The distance between the friction surface 108 a and the brake disk 103 in a state where the lining 108 is separated from the brake disk 103 is a distance at which the lining 108 is displaced. Since the lining 108 is displaced in this manner, the distance by which the lining 108 is displaced is also constant when it is not worn, that is, when the distance between the friction surface 108a and the holding surface 108b is constant.

When the lining 108 is pressed against the rotating brake disc 103, the friction surface 108a is rubbed against the brake disc 103 and the lining 108 is worn. For example, when the lining 108 is worn to the replacement reference thickness, the distance between the friction surface 108a and the holding surface 108b is shortened by G / 2 as a predetermined dimension. In the state where the lining 108 is separated from the brake disc 103, the position of the holding surface 108b is always at the same predetermined position. Therefore, the position of the friction surface 108a in this state is a predetermined value compared with that before the wear. The holding surface 108b at the position approaches G / 2. As a result, the distance between the friction surface 108a and the brake disc 103 increases by G / 2. Accordingly, the distance by which the lining 108 is displaced increases by G / 2 as a predetermined dimension and becomes F + G / 2.

On the other hand, the switch 121 is mounted such that the distance between the roller 121d and the brake disk 103 is F + G / 2 in a state where the lining 108 is separated from the brake disk 103. For this reason, when the lining 108 is pressed against the brake disc 103, the roller 121d comes into contact with the brake disc 103, and the switch 121 generates a signal. While the brake disc 103 is rotating, the roller 121d also rotates together.
Upon receiving the signal generated by the switch 121, the wear state determination unit 130 determines that the wear has progressed to the replacement reference thickness, and the lining 108 reaches the replacement reference thickness from the communication unit 131 to the monitoring station 132 via the communication line 135. Inform the wearer.

The amount of wear differs depending on the location of the lining 108. For example, in FIG. 7, when the amount of wear on the right switch 121 side is larger than that on the left switch 121 side, the thickness of the lining 108 on the right switch 121 side is Is reduced by G / 2, and when the distance by which the lining 108 is displaced increases by G / 2 to F + G / 2, the wear state determination unit 130 wears up to the replacement reference thickness by a signal generated by the right switch 121. It is judged that it is and sends a signal.

The elevator hoisting machine brake device configured as described above includes a position where the friction surface 108a is pressed against the brake disc 103 which is rotatably provided, and a position where the holding surface 108b is separated to a predetermined position. As the distance between the friction surface 108a and the holding surface 108b decreases by a predetermined dimension, the displacement distance increases by a predetermined dimension, so that the switch 121 increases. The roller 121c provided at the tip of the movable shaft 121b contacts the brake disc 103 and the switch 121 generates a signal. The wear state determination unit 130 determines that the wear has occurred by a predetermined dimension, and communicates from the communication unit 131. Report to the monitoring station 132 via the line 135. Therefore, the progress of wear of the lining 108 can be easily monitored at the monitoring station 132 without going to the installation location of the brake device 102.

Further, the amount of wear may vary depending on the location of the lining 108. In this case, the determination to replace the lining 108 is performed in a place where the amount of wear is large. When the thickness of the lining 108 in a place with a large amount of wear is worn by G / 2, the distance that the lining 108 is displaced increases by G / 2 to F + G / 2, and when the nearby switch 121 generates a signal, the wear is generated. Since the monitoring station 132 is notified via the situation determination unit 130, the communication unit 131, and the communication line 135, the progress of the lining 108 wear can be easily monitored by the monitoring station 132 even when the wear amount varies depending on the location of the lining 108. .

Even when the roller 121c is in contact with the brake disc 103 and rotates, the material of the roller 121c is the same as or smaller than the hardness of the material of the brake disc 103, so that the roller 121c does not damage the brake disc 103. Since the friction coefficient of the brake disk 103 is not affected, the braking force can be obtained stably.
In addition, since the switch 121 is attached to the movable iron core 117, when the lining 108 is worn and the shoe 109 is replaced, it is not necessary to attach and remove the switch 121.

Embodiment 3 FIG.
A third embodiment of the present invention will be described with reference to FIG. FIG. 8 is a diagram showing an overall configuration of a brake device of an elevator hoist according to Embodiment 3 of the present invention, and shows a state in which the brake device is braked.

In FIG. 8, a brake drum 203 as a braked member having a cylindrical shape is provided so as to be rotatable integrally with a driving sheave (not shown) for suspending an elevator car (not shown). Yes. A fixed iron core 218 as a fixing member is attached to a housing (not shown) at an inner center portion of the brake drum 203. On both the left and right sides of the fixed iron core 218, movable iron cores 217 and 217 as a pair of movable members are provided so as to be able to advance and retreat toward the inner peripheral surface 203a side of the brake drum 203. Electromagnetic coils 216 are embedded in the left and right sides of the fixed iron core 218 facing the movable iron core 217, and holes for inserting springs 210 for urging the movable iron core 217 toward the inner peripheral surface 203a of the brake drum 203 are inserted. 218a is also provided. The spring 210 has a proximal end inserted into the hole 218 a and a distal end abutted against the movable iron core 217.

When a current is supplied from a power source (not shown) to the electromagnetic coil 216 and the electromagnetic coil 216 is excited, the movable iron core 217 is attracted to the electromagnetic coil 216 side against the biasing force of the spring 210 and contacts the fixed iron core 218. Touch. When the current is interrupted and the excitation of the electromagnetic coil 216 is released, the attractive force disappears and the movable iron core 217 is separated from the fixed iron core 218 and is urged toward the brake drum 203 side.

A lining 208 as a friction member is attached to the movable iron core 217 via a shoe 209 so as to face the inner peripheral surface 203 a of the brake drum 203. The lining 208 is attached to the shoe 209 at the portion of the holding surface 208 b, and the friction surface 208 a, which is the surface opposite to the holding surface 208 b, faces the inner peripheral surface 203 a of the brake drum 203 so as to be able to contact and separate. As the movable iron core 217 is urged toward the inner peripheral surface 203a by the spring 210, or is attracted to the electromagnetic coil 216 side that is excited against the urging force of the spring 210, the movable iron core 217 comes into contact with the fixed iron core 217. The lining 208 is displaced together with the shoe 209 and the movable iron core 217 between the position where the friction surface 208a is pressed against the inner peripheral surface 203a and the position where the friction surface 208a is separated.

When the lining 208 is pressed against the brake drum 203, the brake drum 203 is braked. When the lining 208 is pulled away from the brake drum 203, the brake drum 203 becomes rotatable. When the lining 208 is pressed against the rotating brake drum 203, the friction surface 208a is rubbed against the inner peripheral surface 203a and the lining 208 is worn.

Two distance sensors 221 and 221 are provided for each shoe 209 as a measurement unit of the detection means, and a wear state determination unit 230 connected to each distance sensor 221 by a lead wire 219 as a detection means. Yes. The two distance sensors 221 and 221 provided on one shoe 209 are arranged on both upper and lower sides of the movable iron core 217 so as to face the fixed iron core 218 so that the friction surface 208a is disposed away from the inner circumferential surface 203a. Each is installed on a surface. The lining 208 is connected to a monitoring station 232 provided at a remote location via a communication unit 231 serving as a reporting unit from the wear state determination unit 230 and a communication line 235.

These distance sensors 221 measure the distances between the movable core 217 and the fixed core 218 in the direction in which the movable core 217 is displaced, for example, as a plurality of measurement locations. The distance sensor 221 is attached to the surface of the movable core 217 that contacts the fixed core 218 so that the distance measurement data in a state where the movable core 217 and the fixed core 218 are in contact with each other becomes zero. . Further, the measurement data of the distance to the fixed iron core 218 of the distance sensor 221 is sent to the wear state determination unit 230.

FIG. 8 shows that the lining 208 with the thickness H of the lining 208 attached to the friction surface 208a and the holding surface 208b in a state where the new lining is not worn, that is, the lining 208 is pressed against the brake drum 203. Indicates the state. The distance between the movable iron core 217 and the fixed iron core 218 in the direction in which the movable iron core 217 is displaced in this state is P, for example. When the lining 208 is not worn, the distance by which the lining 208 is displaced between the position pressed against the brake drum 203 and the separated position and the measurement data of the distance sensor 221 are P.
By the way, for example, a state where the lining 208 is worn and the thickness is reduced to H / 2 as a predetermined dimension and the remaining thickness is H / 2 is set as the replacement reference thickness.

The operation of the elevator hoisting machine brake device configured as described above will be described. When the excitation of the electromagnetic coil 216 is released, the lining 208 is pressed against the brake drum 203 via the movable iron core 217 and the shoe 209 by the biasing force of the spring 210, and the brake drum 203 is braked. Next, when the electromagnetic coil 216 is excited, the movable iron core 217 is attracted to the electromagnetic coil 216 side against the biasing force of the spring 210 and comes into contact with the fixed iron core 218. As a result, the lining 208 moves away from the brake drum 203, and the brake drum 203 becomes rotatable. In this way, the brake device 202 is braked or released.

When the lining 208 is separated from the brake drum 203, the movable iron core 217 is in contact with the fixed iron core 218. And the fixed iron core 218 is always in the same position. For this reason, the position of the holding surface 208b of the lining 208 in this state is always the same predetermined position. In this way, the lining 208 displaces the position where the holding surface 208b is always separated from the brake drum 203 at the same predetermined position and the position where the friction surface 208a is pressed against the brake drum 203. The distance between the movable iron core 217 and the fixed iron core 218 in the direction in which the movable iron core 217 is displaced with the friction surface 208a pressed against the brake drum 203, that is, the distance measured by the distance sensor 221 is displaced by the lining 208. Distance. Since the lining 208 is displaced in this manner, when the lining 208 is not worn, that is, when the distance between the friction surface 208a and the holding surface 208b is constant, the distance at which the lining 208 is displaced is also constant.

When the lining 208 is pressed against the brake drum 203, the friction surface 208a is rubbed against the inner peripheral surface 203a, and the lining 208 is worn. For example, when the lining 208 is worn to the replacement reference thickness, the distance between the friction surface 208a and the holding surface 208b is shortened by H / 2 as a predetermined dimension. In the state where the lining 208 is pressed against the brake drum 203, the position of the holding surface 208b approaches the brake drum 203 by H / 2 as compared with before the wear. Accordingly, the distance between the movable iron core 217 and the fixed iron core 218 in the direction in which the movable iron core 217 is displaced, that is, the distance measured by the distance sensor 221 increases by H / 2. Accordingly, the distance by which the lining 208 is displaced increases by H / 2 as a predetermined dimension and becomes P + H / 2.

Thus, when the lining 208 is worn down to the replacement reference thickness and the thickness is reduced by H / 2, the distance measured by the distance sensor 221 becomes P + H / 2. Therefore, when the measurement data of the distance sensor 221 becomes P + H / 2, the wear state determination unit 230 is set in advance so that it is determined that the lining 208 has been worn to the replacement reference thickness. As a result, when the lining 208 wears and the measurement data of the distance sensor 221 increases to P + H / 2, the wear state determination unit 230 replaces the lining 208 with the monitoring station 232 from the communication unit 231 via the communication line 235. Notify that the wear has reached the reference thickness.

In the brake device for an elevator hoisting machine configured as described above, a distance by which the lining 208 is displaced when the lining 208 is worn to the replacement reference thickness is set in the wear state determination unit 230 in advance. Then, when the lining 208 is worn and the measurement data of the distance sensor 221 in a state where the friction surface 208a is pressed against the inner peripheral surface 203a is increased to a preset dimension, the wear state determination unit 230 is connected from the communication unit 231 to the communication line 235. Via, the monitoring station 232 is notified that the lining has been worn down to the replacement reference thickness. For this reason, the progress of the wear of the lining 208 can be easily monitored at the monitoring station 232 without going to the place where the brake device 202 is installed.

Further, since the friction surface 208a is only in contact with the inner peripheral surface 203a, there is no adhesion of foreign matter or scratches affecting the friction coefficient of the inner peripheral surface 203a, and the braking force of the brake device 202 is stabilized. can get.

In each embodiment, a case where a plurality of switches or distance sensors are provided has been described. However, one switch or distance sensor is provided in one of a plurality of linings provided in one hoisting machine. It is possible to monitor the progress of the wear at the monitoring station simply by providing it. Also, if the number is increased, the progress of wear can be monitored in more detail.

In addition, the notification to the monitoring stations 32 and 132 is described in the case where the first embodiment is set in two stages and the second embodiment is set in one stage according to the amount of wear, but it is provided in one hoisting machine. Any number of steps can be set as long as the number of switches is within the range. If the number of steps is reduced, the setting operation of the switch becomes easy, and if the number of steps is increased, the progress of wear can be monitored in more detail.

Further, when the distance sensor 221 is used as in the third embodiment, if the wear state determination unit 230 is set so as to notify a plurality of times according to the measurement data, the progress of wear by one distance sensor 221. The condition can be monitored in more detail. Furthermore, if the notification is made more than once in advance before the replacement reference thickness, the function of the brake device 202 can be secured and the lining 208 can be used up to the replacement reference thickness, and discarded. The environmental load can be reduced by reducing the lining 208 to be performed.

Also, in the second and third embodiments, as in the first embodiment, for example, an indicator is installed in the machine room where the hoisting machine is installed to display the progress of wear, or in the operation control unit of the elevator. The same effect can be obtained by sending a signal and stopping the elevator at a safe landing.
In the second embodiment, the case where the switch 121 is attached to the movable iron core 117 is described. For example, a distance sensor is attached to the movable iron core 117, and the distance between the movable iron core 117 and the fixed iron core 118 is set as in the third embodiment. You may measure and monitor the progress of wear.
In the third embodiment, the distance sensor 221 is attached to the movable iron core 217 and the distance between the movable iron core 217 and the fixed iron core 218 is measured. However, if the distance that the lining 208 is displaced can be measured, the shoe The distance sensor 221 may be attached to other places such as 209 or the fixed iron core 218.

1 hoisting machine,
2,102,202 brake device,
3,203 brake drum,
3a outer peripheral surface,
8,108,208 lining,
8a, 108a, 208a Friction surface,
8b, 108b, 208b holding surface,
19, 119, 219 lead wire,
21, 22, 23, 24, 121 switches,
21a, 22a, 23a, 24a, 121a switch body,
21b, 22b, 23b, 24b, 121b movable shaft,
21c, 22c, 23c, 24c, 121c axis,
21d, 22d, 23d, 24d rollers,
30, 130, 230 Abrasion status determination unit,
31, 131, 231 communication section,
32, 132, 232 monitoring stations,
33 Display,
35, 135, 235 lines,
103 brake disc,
203a inner peripheral surface,
209 shoe,
217 movable iron core,
218 fixed iron core,
221 Distance sensor.

Claims (7)

A braked member that is rotatably provided and braked;
A friction surface and a holding surface opposite to the friction surface, wherein the friction surface is pressed against the member to be braked, and the friction surface is pressed against the braked surface so that the holding surface is at a predetermined position. A friction member displaced to a position separated from the member;
When the frictional surface is pressed against the rotating braked member, the frictional member is worn and displaced as the distance between the frictional surface and the holding surface decreases by a predetermined dimension. Detecting means for generating a signal when the distance increases by the predetermined dimension;
Receiving means for receiving the signal and reporting to a monitoring station provided at a remote location with the friction member;
A brake device for an elevator hoisting machine. The detection means is provided in the vicinity of the friction member and at a position where the distance from the friction surface becomes the predetermined dimension toward the holding surface so as to face the braked member. And a contact portion that is displaced integrally with the friction member,
When the frictional surface is pressed against the braked member and the displaced distance increases by the predetermined dimension, the contact portion generates the signal by contacting the braked member. The brake device for an elevator hoist according to claim 1. A plurality of the contact portions are provided,
The plurality of abutting portions are disposed in the vicinity of the friction member end portion separated in at least one of a direction in which the friction surface is rubbed and a direction lateral to the direction in which the friction surface is rubbed. The elevator hoisting machine brake device according to claim 2. A movable member displaced integrally with the friction member;
A fixed member provided in the vicinity of the movable member and not interlocked with the braked member and the friction member;
The detection means includes a measurement unit that measures a distance in the displaced direction between the movable member and the fixed member,
2. The elevator hoisting brake according to claim 1, wherein the signal is generated when the measured distance between the movable member and the fixed member increases by the predetermined dimension. 3. apparatus. The distance between the movable member and the fixed member in the displaced direction has a plurality of measurement points to be measured,
The plurality of measurement points are provided at an end portion of the movable member separated in at least one direction of a direction in which the friction surface is rubbed and a direction lateral to the direction in which the friction surface is rubbed. The brake device for an elevator hoist according to claim 4, The brake device for an elevator hoist according to any one of claims 1 to 5, wherein at least two dimensions are set as the predetermined dimension. The elevator hoist according to any one of claims 1 to 6, further comprising a display unit provided in the vicinity of the friction member and displaying in accordance with a signal generated by the detection unit. Machine brake device.

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