JP2009107807A - Braking device for elevator hoisting machine - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a braking device for an elevator hoisting machine having braking characteristics suitable for each of normal and emergency operations. <P>SOLUTION: Two braking bodies are provided to one braked body (13). In a normal operation, an emergency braking body (14A) holds brake pads 15A, 15'A in a state of being separated from the braked body (13), and sets a difference between a pressing force of a braking spring 29A provided in the emergency braking body (14A) and an attraction force by the excitation of a magnet 22A small compared with that of a normal braking body (14B). Thereby, a release time until the brake pads 15A, 15'A of the emergency braking body (14A) are pressed to the braked body (13) is shortened, and made suitable for emergency braking. Meanwhile, the normal braking body (14B) has a characteristic required for the normal braking of an elevator so as to shorten a time from nipping to the release of the braked body by brake pads 15B, 15'B. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a brake device for an elevator hoisting machine.

  As a conventionally used braking device for an elevator hoisting machine, the brake pad is released from the braked body, that is, the disk by using the electromagnetic attractive force of the magnet, and the electromagnetic electromagnetic attractive force is released to release the brake spring. There is a method in which two braking bodies having the same performance for pressing a brake pad against a disk by pressing force are installed on the same disk. In this method, two units operate simultaneously. Even if one braking device breaks down, the other car can stop the car.

On the other hand, in an elevator hoisting machine having a speed reducing mechanism, a normal car stationary braking means is installed on the hoisting machine (input shaft) side, and the abnormal speed at which the rotational speeds of the input shaft and output shaft do not correspond In some cases, an emergency braking means that operates in the case of this is installed on the sheave (output shaft) side (for example, see Patent Document 1).
Japanese Examined Patent Publication No. 63-3823 (Emergency Page Right Column 15th Column to Normal Page Right Column 19th Column, Normal Diagram)

  In the former prior art described above, it is necessary to increase the difference between the attraction force due to magnet excitation and the brake pad pressing force in order to shorten the starting time from when the disc is clamped to when the brake pad is pulled away from the disc. . Therefore, while the activation time is short, the release time until the brake pad is pressed against the disc tends to be long. Also, by operating two units at the same time, there is a tendency for the sound at startup and release to increase.

  In the latter prior art described above, two braked bodies such as discs against which the brake pads of the braking means are pressed are required, which causes a disadvantage in layout.

  An object of the present invention is to provide a braking device for an elevator hoisting machine having braking characteristics suitable for each of a normal time and an emergency time.

  In order to achieve the above object, an invention according to claim 1 of the present invention includes a braked body that rotates integrally with a hoisting machine rotating body, and a pair of brakes disposed opposite to both sides of the braked body. A pad, a braking spring that presses the pair of brake pads against the braked body, a magnet that acts to pull the brake pad away from the braked body, a body that is connected to the magnet and supports one of the brake pads; A movable iron core that is disposed opposite to the magnet and supports the other of the brake pads, and a coil that excites the magnet by energization and generates an attractive force between the magnet and the movable iron core. In the elevator hoisting machine braking device provided with the braking body, the two braking bodies for emergency and normal are installed on the braked body. During normal operation of the motor, the emergency braking body keeps the brake pad away from the braked body, and the pressing force of the braking spring provided in the emergency braking body and the magnet It is characterized in that the difference from the attractive force due to excitation is set smaller than that of a normal braking body.

  In the invention according to claim 1 configured as described above, the emergency braking body is a braking body that makes an emergency stop of the car due to an abnormality in the elevator, and in this emergency braking body, the pressing force of the braking spring and the magnet The difference between the attraction force due to the excitation of the motor is set to be smaller than that of the normal braking body that brakes the car during normal operation, so that the brake pad of the emergency braking body is pushed against the braked body. The release time until installation is shortened, and it can be made suitable for emergency braking. On the other hand, the normal braking body has characteristics required for normal braking of the elevator, and can shorten the start-up time, that is, the time from the braked body clamping pressure to the release by the brake pad.

  In the invention according to claim 2 of the present invention, the number of turns of the coil of the coil of the emergency braking body is reduced, and the pressing force of the braking spring provided in the emergency braking body and the excitation of the magnet are used. It is characterized in that the difference from the suction force is made smaller than that of a normal braking body. In the invention according to claim 2 configured as described above, it is possible to provide a braking characteristic suitable for an emergency braking body by a simple method of reducing the number of windings of the coil of the emergency braking body. .

  According to a third aspect of the present invention, the coil energization amount for exciting the magnet of the emergency braking body is reduced, the pressing force of the braking spring provided in the emergency braking body and the magnet It is characterized in that the difference from the attractive force due to the excitation is made smaller than that of a normal braking body. In the invention according to claim 3 configured as described above, the braking characteristic suitable for the emergency braking body can be obtained by a simple method of reducing the coil energization amount for exciting the magnet of the emergency braking body. Can be provided.

  In the invention according to claim 4 of the present invention, the pressing force of the braking spring of the emergency braking body is increased, and the pressing force of the braking spring provided in the emergency braking body and the attraction by the excitation of the magnet It is characterized in that the difference from the force is made smaller than that of a normal braking body. In the invention according to claim 4 configured as described above, it is possible to provide a braking characteristic suitable for an emergency braking body by a simple method of increasing the pressing force of the braking spring of the emergency braking body. it can.

  According to the present invention, it has braking characteristics suitable for each of the normal time and emergency time, and in the case of an emergency brake body, the release time until the brake pad is pressed against the braked body is shortened. The safety of the elevator can be improved. On the other hand, the normal braking body can be set to be suitable for normal braking of the elevator. In addition, since the car is stopped by one braking device, the noise at the time of brake activation and release can be reduced compared to the simultaneous operation of two units. Furthermore, since two brake devices are installed on the same brake target body, the layout of the brake devices can be made compact.

  DESCRIPTION OF EMBODIMENTS Hereinafter, embodiments of a braking device for an elevator hoist according to the present invention will be described with reference to the drawings.

  FIG. 1 is a front sectional view showing an embodiment of a braking device for an elevator hoist according to the present invention, FIG. 2 is an enlarged front sectional view showing an enlarged main part of the braking device for an elevator hoist, and FIG. 4 is an enlarged front cross-sectional view of the elevator hoisting machine braking device in the middle of operation, FIG. 4 is an enlarged front cross-sectional view of the elevator hoisting machine braking device showing a state at the end of the braking release operation, and FIG. FIG. 6 is a schematic configuration diagram of an elevator to which the hoisting machine braking device is applied, and FIG. 6 is a plan view illustrating a schematic configuration of the hoisting machine of FIG. 5.

  As shown in FIG. 5, the elevator includes a hoistway 1 formed in the building, a car 2 and a counterweight 3 that elevate and lower the hoistway 1, and a main rope 4 that connects the car 2 and the counterweight 3. A machine room 5 provided in the upper part of the hoistway 1, a hoist 6 installed in the machine room 5 and driving the car 2 and the counterweight 3 via the main rope 4, and an intermediate part of the main rope 4 And a baffle wheel 7 on which is wound.

  As shown in FIG. 6, the hoisting machine 6 includes a base 8, a drive unit 9, a pedestal 10, a shaft 11, a sheave 12, a disk 13, an emergency braking body 14A, and a normal braking body 14B. . That is, the drive device 9 is installed on the base 8 fixed to the foundation of the machine room 5, and the shaft 11 that transmits the drive force of the drive device 9 is connected to the pedestal 10 (fixed portion) fixed to the base 8. It is supported rotatably. Further, a sheave 12 that frictionally drives the main rope 4 is connected to the shaft 11 between the driving device 9 and the pedestal 10, and rotates as the shaft 11 rotates. The disk 13 is fixed on the opposite side of the driving device 9 with respect to the sheave 12.

  The elevator hoisting machine braking device according to the present embodiment includes two braking bodies, that is, an emergency braking body 14A and a normal braking body 14B with respect to a braked body, that is, the disk 13, and these The emergency braking body 14A and the normal braking body 14B are attached to the pedestal 10.

  Here, details of the emergency braking body 14A and the normal braking body 14B will be described with reference to FIG. Note that “A” after the number represents a part constituting the emergency braking body 14A, and “B” represents a part constituting the normal braking body 14B. Since the configuration of the braking body 14B is the same, here, the emergency braking body 14A will be described as an example.

  In FIG. 1, 15A and 15'A are brake pads, 16A and 16'A are pad holders, 17A is a pin supporting the pad holder 16'A, 18A is a body, 19A is a bearing inserted into the body 18A, and 20A is Floating pin for supporting the body 18A via the bearing 19A, 22A a magnet, 23A a core constituting the magnet 22A, 24A a coil constituting the magnet 22A, 25A a movable iron core, 26A a rod connecting the movable iron core 25A, 27A is a bearing inserted into the core 23A, 28A is a fastening member such as a bolt connecting the body 18A and the core 23A, 29A is a braking spring, and 31A is a regulating member fixed to the pedestal 10. In the figure, the same reference numerals as those shown in FIG. 6 denote the same parts.

  Further, as shown in FIG. 1, a pair of brake pads 15A and 15'A are arranged on both sides of the disc 13 so that one brake pad 15A faces the pad holder 16A and the other brake pad 15 '. A is supported by the pad holder 16'A. The pad holder 16'A is connected to the body 18A by a pin 17A, and the body 18A forms a bearing 19A on the outer periphery. The bearing 19A is supported so that the floating pin 20A slides, and the floating pin 20A is attached to the pedestal 10. By fixing, the body 18A is supported in a floating manner. The body 18A is connected to a core 23A constituting the magnet 22A and a fastening member 28A such as a bolt.

  On the other hand, the pad holder 16A is connected to a movable iron core 25A disposed so as to face the core 23A with a minute gap via a rod 26A. The movable iron core 25A is supported by a bearing 27A formed at the center of the core 23A via a rod 26A. The magnet 22A includes a coil 24A built around a bearing 27A that supports the movable iron core 25A. Furthermore, between the magnet 22A and the movable iron core 25A, a braking spring 29A is provided that acts in a direction to repel the magnet 22A and the movable iron core 25A.

  In addition, the pedestal 10 is provided with a regulating member 31A for restricting the movement of the movable core 25A toward the magnet 22A beyond a predetermined distance so as to maintain a minute gap during the braking of the movable core 25A and the braking device 14A. Yes. The direction in which the rod 26A and the bearing 27A, and the floating pin 20A and the bearing 19A are arranged is a direction in which the brake pad 15A can be clamped against the disk 13 or moved in the opposite direction.

  Further, during braking of the emergency braking body 14A, a predetermined clamping pressure is applied between the disk 13 and the pair of brake pads 15 by the pressing force of the braking spring 29A interposed between the movable iron core 25A and the magnet 22A. appear. As described above, the emergency brake body 14A has been described as an example here, but the normal brake body 14B has the same configuration.

  During normal operation of the elevator, the emergency braking body 14A holds the brake pads 15A and 15′A away from the disk 13 and the pressing force of the braking spring 29A provided in the emergency braking body 14A. The difference between the attraction force due to the magnet 22A excitation is set smaller than the difference between the pressing force of the brake spring 29B of the normal brake body 14B and the attraction force due to the magnet 22B excitation. For example, by reducing the number of windings of the coil 24A of the emergency braking body 14A, the difference between the pressing force of the braking spring 29A provided in the emergency braking body 14A and the attraction force due to the excitation of the magnet 22A can be calculated. It is smaller than that of 14B.

  Here, the operation at the time of brake release of the elevator hoisting machine braking device will be described with reference to FIG. 2, FIG. 3, and FIG. 4, taking the emergency braking body 14A as an example. 2 to 4 show only the emergency braking body 14A.

  First, in FIG. 2, when the coil 24A is energized and the magnet 22A is excited, an electromagnetic attractive force exceeding the spring force of the braking spring 29A acts on the movable iron core 25A, and the movable iron core 25A begins to move toward the magnet 22A. As a result, as shown in FIG. 3, a gap is formed between the disc 13 and the brake pad 15 </ b> A located on the magnet 22 </ b> A side and the disc 13. Furthermore, as shown in the figure, when the movable iron core 25A moves to the position of the restricting member 31A, the movable iron core 25A is restricted from moving, and cannot move any further.

  Thereafter, when the electromagnetic attractive force further acts, the magnet 22A starts to move toward the regulated movable core 25A, and the disc 13 and the brake pad are connected via the fastening member 28A and the body 18A connected to the fastening member 28A. An air gap is generated between 15'A. Finally, as shown in FIG. 4, when the movable iron core 25 </ b> A and the magnet 22 </ b> A complete the attraction, a uniform gap is formed between the brake pads 15 </ b> A and 15 ′ A on both sides of the disk 13.

  Next, the operation of each of the emergency braking body 14A and the normal braking body 14B will be described with reference to FIG. In each of the braking bodies 14A and 14B, the magnets 22A and 22B are excited by energizing the coils 24A and 24B as described above, and the brake pads 15A, 15'A, 15B, and 15'B are The elevator car 2 can be moved up and down at this time.

  Further, when the elevator 2 that has arrived at the target floor is kept stationary during normal operation of the elevator, the energization of the coil 24B of the normal braking body 14B is canceled to de-energize the attractive force of the magnet 22B. The brake pads 15B and 15′B are pressed against the disk 13 by the pressing force of the braking spring 29B, and the car 2 is held. During such normal operation, the coil 24 </ b> A of the emergency braking body 14 </ b> A remains energized, so that the brake pads 15 </ b> A and 15 ′ A are held away from the disk 13.

  On the other hand, when an abnormality occurs for some reason during the traveling of the elevator and the car 2 is stopped in an emergency, the energization of the coil 24A of the emergency braking body 14A and the coil 24B of the normal braking body 14B is canceled. Then, the suction force of the magnets 22A, 22B is de-energized, and the brake pads 15A, 15'A, 15B, 15'B are pressed against the disk 13 by the pressing force of the braking springs 29A, 29B, and the car 2 is stopped in an emergency. At this time, the difference between the pressing force of the braking spring 29A provided in the emergency braking body 14A and the attraction force by the excitation of the magnet 22A is the pressing force of the braking spring 29B of the normal braking body 14B and the attraction force by the excitation of the magnet 22B. The release time until the brake pads 15A, 15′A are pressed against the disk 13 is set to be released until the brake pads 15B, 15′B are pressed against the disk 13. The braking force is raised within a shorter time than in the time.

  In this case, the emergency brake body 14A and the normal brake body 14 are operated in the event of an emergency, but only one of the emergency brake bodies 14A may be operated to make an emergency stop. Further, when the normal brake body 14B is in a braking state in the stationary holding state while the door is open, this abnormality is detected and an emergency brake body is detected even if a failure occurs in which the car 2 moves for some reason. It is of course possible to provide a system that brakes the car 2 by operating 14A and prevents free running of the car 2.

  According to this embodiment, it has braking characteristics suitable for each of the normal time and the emergency time, and in the emergency brake body 14A, the release time until the brake pads 15A and 15'A are pressed against the disk 13 is shortened. This can improve the safety of the elevator in an emergency. On the other hand, the normal braking is set to be suitable for the normal braking of the elevator, and the noise at the time of starting and releasing the normal braking body 14B can be reduced, and a comfortable service can be provided. By installing the emergency braking body 14A and the normal braking body 14B with the same disk 13 as a braked body, the overall dimensions of the hoisting machine 6 can be made compact. Also, the braking characteristics suitable for emergency use can be provided in the emergency braking body 14A by a simple method of reducing the number of windings of the coil 24A of the emergency braking body 14A.

  In the above-described embodiment, the pressing force of the braking spring 29A provided in the emergency braking body 14A and the attraction force by excitation of the magnet 22A are reduced by reducing the number of windings of the coil 24A of the emergency braking body 14A. Although the difference is made smaller than that of the normal brake body 14B, the present invention is not limited to this, and a method of reducing the coil energization amount for exciting the magnet 22A of the emergency brake body 14A, or The difference between the pressing force of the braking spring 29A provided in the emergency braking body 14A and the attraction force due to the excitation of the magnet 22A is increased by increasing the pressing force of the braking spring 29A of the emergency braking body 14A. It is set smaller than the difference between the pressing force of the braking spring 29B of the body 14B and the attractive force by the excitation of the magnet 22B, and the emergency braking body 14A It may be provided with damping characteristics suitable as a regular.

FIG. 1 is a front sectional view showing an embodiment of a brake device for an elevator hoist according to the present invention. It is the expanded front sectional view which expanded the principal part of the brake device for elevator hoists. It is an expanded front sectional view of a brake device for an elevator hoist in a state in the middle of a braking release operation. It is an expanded front sectional view of the brake device for elevator hoists showing the state at the end of the braking release operation. It is a schematic block diagram of the elevator to which the braking device for hoisting machines of this invention is applied. It is a top view which shows schematic structure of the winding machine of FIG.

Explanation of symbols

10 Pedestal (fixed part)
13 disc (braking body)
14A Emergency brake body 14B Normal brake body 15A, 15'A, 15B, 15'B Brake pad 18A, 18B Body 22A, 22B Magnet 23A, 23B Core 24A, 24BB Coil 25A, 25B Movable core 29A, 29B Brake spring

Claims (4)

A braked body that rotates integrally with the hoisting machine rotating body, a pair of brake pads disposed opposite to both sides of the braked body, a braking spring that presses the pair of brake pads against the braked body, A magnet that acts to pull the brake pad away from the braked body, a body that is connected to the magnet and supports one of the brake pads, a movable iron core that is disposed opposite the magnet and supports the other of the brake pads In an elevator hoisting brake device comprising a braking body having a coil that excites the magnet by energization and generates an attractive force between the magnet and the movable iron core,
Two emergency and normal brake bodies are installed for the braked body, and the emergency brake body keeps the brake pad away from the braked body during normal operation of the elevator. In addition, the difference between the pressing force of the braking spring provided in the emergency braking body and the attraction force due to the excitation of the magnet is set smaller than that of the normal braking body. Braking device for upper machine.   The number of windings of the coil of the emergency braking body is reduced, and the difference between the pressing force of the braking spring provided in the emergency braking body and the attractive force due to the excitation of the magnet is The braking device for an elevator hoist according to claim 1, wherein the braking device is made smaller than that.   The amount of energization of the coil for exciting the magnet of the emergency braking body is reduced, and the difference between the pressing force of the braking spring provided in the emergency braking body and the attractive force by the excitation of the magnet is The elevator hoisting machine braking device according to claim 1, wherein the braking device is made smaller than that of the braking body for an elevator.   The pressing force of the braking spring of the emergency braking body is increased, and the difference between the pressing force of the braking spring provided in the emergency braking body and the attraction force by the magnet excitation is determined as a normal braking body. The brake device for an elevator hoisting machine according to claim 1, wherein the braking apparatus is made smaller than that of the elevator hoisting machine.

Images