Brake system and elevator hoisting machine

Abstract

The objective is to obtain a braking device and an elevator hoisting machine that can suppress the permanent deformation of the cushion rubber due to long-term storage. [Solution] In storage, the pair of position adjustment bolts 26 are displaced away from the pair of cushion rubbers 25 relative to the movable iron core 22. As a result, at least a portion of each cushion rubber 25 is inserted into the corresponding position adjustment screw hole 22b. At this time, the tip of each position adjustment bolt 26 is away from the corresponding cushion rubber 25. Therefore, each cushion rubber 25 is not compressed.

Description

Technical Field

[0001] The present disclosure relates to a braking device and an elevator hoist.

Background Art

[0002] In a conventional elevator hoist brake, a rubber buffer member is fixed to a surface of a movable core in a magnetic core of an electromagnetic magnet that faces the movable core. The buffer member absorbs an impact that occurs when the movable core collides with the electromagnetic magnet (see, for example, Patent Document 1).

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] In the conventional hoist brake as described above, when the buffer member is compressed for a long time, permanent distortion, so-called sag, occurs in the buffer member. Therefore, the hoist brake is configured such that the buffer member is not compressed by the movable core when the braking force is generated during the stop of the elevator.

[0005] However, at the manufacturing site of the hoist brake, that is, in the factory, since there is no braking object such as a brake drum, it is difficult to maintain the state where the movable core is separated from the electromagnetic magnet, and the hoist brake is stored with the movable core applied to the electromagnetic magnet. Therefore, in a hoist brake stored for a long time, permanent distortion may occur in the buffer member, and the buffer member may not be able to sufficiently absorb the impact that occurs when the movable core collides with the electromagnetic magnet.

[0006] This disclosure was made to solve the above-mentioned problems and aims to provide a braking device and an elevator hoisting machine that can suppress permanent deformation of the cushion rubber due to long-term storage. [Means for solving the problem]

[0007] The brake device according to this disclosure comprises a fixed core having a suction surface, a movable core that can be displaced in directions approaching or moving away from the suction surface, a braking spring that applies a force to the movable core in the direction away from the suction surface, an electromagnetic coil provided on the fixed core that generates a force that attracts the movable core toward the fixed core against the braking spring, and a cushion rubber that absorbs the impact that occurs when the movable core collides with the fixed core. During storage, a fixing bolt provided between the fixed core and the movable core is tightened, compressing the braking spring and maintaining a storage state in which the movable core is in contact with the suction surface. The cushion rubber is provided on the first core, which is either the fixed core or the movable core. A position adjustment screw hole is provided on the second core, which is the other of the fixed and movable cores, at a position opposite to the cushion rubber. A position adjustment bolt is screwed into the position adjustment screw hole. When the braking force is released during use, the tip of the position adjustment bolt contacts the cushion rubber. In storage, the position adjustment bolt is displaced away from the cushion rubber relative to the second core, causing at least a portion of the cushion rubber to be inserted into the position adjustment screw hole. Furthermore, the brake device according to this disclosure comprises a fixed core having a suction surface, a movable core that can be displaced in a direction toward or toward the suction surface, a braking spring that applies a force toward the movable core toward the suction surface, an electromagnetic coil provided on the fixed core that generates a force that attracts the movable core toward the fixed core against the braking spring, and a cushion rubber that absorbs the impact that occurs when the movable core collides with the fixed core, and when stored, a fixing bolt provided between the fixed core and the movable core is tightened so that the braking spring is compressed and the storage state in which the movable core is in contact with the suction surface is maintained, and either the fixed core or the movable core is a first iron The core is provided with a fixing screw hole into which a fixing bolt is screwed in, and a housing hole. The second core, which is the other of the fixed core and the movable core, is provided with a through hole through which the fixing bolt passes. A support member is housed in the housing hole, and the cushion rubber is supported by the support member. The cushion rubber is displaceable together with the support member between a use position interposed between the fixed core and the movable core and a non-use position not interposed between the fixed core and the movable core. An auxiliary spring is provided in the housing hole to displace the cushion rubber from the non-use position to the use position. In the storage state, the support member is pushed by the fixing bolt, and the cushion rubber is displaced to the non-use position. [Effects of the Invention]

[0008] According to this disclosure, it is possible to suppress the occurrence of permanent deformation in the cushion rubber due to long-term storage of the brake device. [Brief explanation of the drawing]

[0009] [Figure 1] This is a schematic diagram showing an elevator system according to Embodiment 1. [Figure 2] Figure 1 is a schematic cross-sectional view showing the main components of the braking device installed on the hoisting machine body. [Figure 3] Figure 2 is a cross-sectional view showing the storage condition of the brake device. [Figure 4] Figure 3 is a front view showing the brake system. [Figure 5]This is a schematic cross-sectional view showing the main parts of the brake device according to Embodiment 2. [Figure 6] Figure 5 is a cross-sectional view showing the storage condition of the brake device. [Figure 7] Figure 6 is a front view showing the brake system. [Modes for carrying out the invention]

[0010] The embodiments will be described below with reference to the drawings. Embodiment 1. Figure 1 is a schematic diagram showing an elevator system according to Embodiment 1. In the figure, a support beam 12 is provided at the top of the hoistway 11. An elevator hoisting machine 13 is supported on the support beam 12. The elevator hoisting machine 13 has a hoisting machine body 14 and a drive sheave 15.

[0011] A suspension system 16 is wrapped around the drive sheave 15. The suspension system 16 can consist of multiple ropes or multiple belts.

[0012] The elevator car 17 and the counterweight 18 are suspended within the elevator shaft 11 by the suspension body 16. The elevator car 17 and the counterweight 18 move up and down within the elevator shaft 11 by rotating the drive sheave 15.

[0013] Within the elevator shaft 11, there is a pair of car guide rails (not shown) and a pair of counterweight guide rails (not shown). The pair of car guide rails guide the movement of the car 17. The pair of counterweight guide rails guide the movement of the counterweight 18.

[0014] Figure 2 is a schematic cross-sectional view showing the main parts of the brake device provided in the hoisting machine body 14 of Figure 1. The hoisting machine body 14 includes a hoisting machine motor (not shown), a brake rotating body (not shown), and a brake device 20.

[0015] The winding-up machine motor rotates the drive sheave 15. The brake rotor rotates integrally with the drive sheave 15. Also, the brake rotor is, for example, a brake drum. The brake device 20 holds the drive sheave 15 in a stationary state. Also, the brake device 20 brakes the rotation of the drive sheave 15.

[0016] The brake device 20 includes a fixed iron core 21, a movable iron core 22, a brake shoe (not shown), a brake lining (not shown), a pair of braking springs 23, an electromagnetic coil 24, a pair of cushion rubbers 25, and a pair of position adjustment bolts 26.

[0017] The fixed iron core 21 has a suction surface 21a. A fixed screw hole 21b is provided at the center of the fixed iron core 21.

[0018] The movable iron core 22 faces the suction surface 21a. Also, the movable iron core 22 is displaceable in a direction approaching or separating from the suction surface 21a.

[0019] The movable iron core 22 is provided with a through hole 22a and a pair of position adjustment screw holes 22b. That is, the second iron core in the first embodiment is the movable iron core 22. The through hole 22a is located on the extension line of the fixed screw hole 21b.

[0020] The brake shoe is provided on the side of the movable iron core 22 opposite to the fixed iron core 21. The brake lining is provided on the side of the brake shoe opposite to the movable iron core 22. The brake shoe and the brake lining are displaced in the same direction as the movable iron core 22 due to the displacement of the movable iron core 22.

[0021] A pair of braking springs 23 are provided between the fixed core 21 and the movable core 22. The pair of braking springs 23 also apply a force to the movable core 22 in a direction away from the suction surface 21a. The brake lining is pressed against the brake rotating body via the movable core 22 and brake shoes by the pair of braking springs 23. This applies a braking force to the drive sheave 15. Figure 2 shows the braking force applied state of the brake device 20.

[0022] The electromagnetic coil 24 is provided on the fixed core 21. Furthermore, the electromagnetic coil 24 is embedded in the fixed core 21. When energized, the electromagnetic coil 24 generates a force that pulls the movable core 22 toward the fixed core 21, against the pair of braking springs 23. As the movable core 22 is pulled toward the fixed core 21, the brake lining is separated from the brake rotating body, and the braking force on the drive sheave 15 is released.

[0023] A pair of cushion rubbers 25 are provided on the suction surface 21a. That is, the first core in Embodiment 1 is the fixed core 21. The pair of cushion rubbers 25 also protrude from the suction surface 21a toward the movable core 22. Furthermore, the pair of cushion rubbers 25 absorb the impact that occurs when the movable core 22 collides with the fixed core 21.

[0024] A pair of position adjustment bolts 26 are screwed into a pair of position adjustment screw holes b from the opposite side of the movable core 22 from the fixed core 21.

[0025] The pair of position adjustment screw holes 22b are provided in the movable core 22 at positions opposite to the pair of cushion rubbers 25. When the braking force is released during use of the brake device 20, that is, when the movable core 22 is attracted towards the fixed core 21, the tips of the pair of position adjustment bolts 26 come into contact with the pair of cushion rubbers 25.

[0026] Figure 3 is a cross-sectional view showing the storage state of the brake device 20 shown in Figure 2. Figure 4 is a front view showing the brake device 20 shown in Figure 3. When the brake device 20 is stored, a fixing bolt 27 is provided between the fixed core 21 and the movable core 22. The storage state shown in Figure 3 is maintained by tightening the fixing bolt 27.

[0027] In storage, the pair of damping springs 23 are each compressed, and the movable iron core 22 is in contact with the suction surface 21a. The fixing bolt 27 is passed through the through hole 22a from the opposite side of the fixing iron core 21 and screwed into the fixing screw hole 21b.

[0028] A brake release bolt can be used as the fixing bolt 27. The brake release bolt is a bolt used to mechanically release the braking force by displacing the movable core 22 toward the fixed core 21 during maintenance work on the elevator hoisting machine 13, such as replacing the brake lining.

[0029] Furthermore, in storage, the pair of position adjustment bolts 26 are displaced away from the pair of cushion rubbers 25 relative to the movable iron core 22. As a result, at least a portion of each cushion rubber 25 is inserted into the corresponding position adjustment screw hole 22b. At this time, the tip of each position adjustment bolt 26 is away from the corresponding cushion rubber 25. Therefore, each cushion rubber 25 is not compressed.

[0030] In such a brake device 20, even if the movable iron core 22 is kept in contact with the fixed iron core 21 during storage, the pair of cushion rubbers 25 remain uncompressed. Therefore, permanent deformation of the pair of cushion rubbers 25 due to long-term storage can be suppressed.

[0031] This makes it possible to stably suppress noise generation caused by collisions between the movable core 22 and the fixed core 21 in the elevator hoisting machine 13 over a long period of time. As a result, the burden of maintenance work can be reduced.

[0032] Furthermore, when using the brake device 20, the pair of position adjustment bolts 26 can be easily adjusted to contact the pair of cushion rubbers 25 simply by tightening the pair of position adjustment bolts 26.

[0033] Furthermore, if no compressive force that would cause permanent deformation is applied to the pair of cushion rubbers 25 while the brake device 20 is stored, the pair of position adjustment bolts 26 may be in contact with the pair of cushion rubbers 25.

[0034] Furthermore, the first core may be a movable core 22, and the second core may be a fixed core 21. In this case, a pair of cushion rubbers 25 are provided on the movable core 22, and a pair of position adjustment screw holes are provided on the fixed core 21.

[0035] Furthermore, the number of cushion rubbers 25 and the number of position adjustment bolts 26 are not limited to two, but may be one or three or more, respectively.

[0036] Embodiment 2. Next, Figure 5 is a schematic cross-sectional view showing the main parts of the brake device according to Embodiment 2. The hoisting machine body 14 of Embodiment 2 has a brake device 30 instead of the brake device 20 of Embodiment 1. Other configurations of the elevator device in Embodiment 2 are the same as those of Embodiment 1.

[0037] The brake device 30 includes a fixed core 31, a movable core 32, brake shoes (not shown), brake linings (not shown), a pair of braking springs 33, an electromagnetic coil 34, a pair of cushion rubbers 35, a pair of flat plate-shaped support members 36, and a pair of auxiliary springs 37.

[0038] The fixed core 31 has a suction surface 31a. The fixed core 31 is provided with a pair of fixing screw holes 31b and a pair of housing holes 31c. That is, the first core of Embodiment 2 is the fixed core 31.

[0039] The movable core 32 faces the suction surface 31a. Furthermore, the movable core 32 can be displaced in directions toward or away from the suction surface 31a.

[0040] The movable core 32 is provided with a pair of through holes 32a. That is, the second core in Embodiment 2 is the movable core 22. The pair of through holes 32a are each located on the extension of the fixed screw holes 31b.

[0041] The brake shoe is located on the side of the movable core 32 opposite to the fixed core 31. The brake lining is located on the side of the brake shoe opposite to the movable core 32. The brake shoe and brake lining are displaced in the same direction as the movable core 32 due to the displacement of the movable core 32.

[0042] A pair of braking springs 33 are provided between the fixed core 31 and the movable core 32. The pair of braking springs 33 also apply a force to the movable core 32 in a direction away from the suction surface 31a. The brake lining is pressed against the brake rotating body via the movable core 32 and brake shoes by the pair of braking springs 33. This applies a braking force to the drive sheave 15. Figure 5 shows the braking force applied to the brake device 30.

[0043] The electromagnetic coil 34 is provided on the fixed core 31. Furthermore, the electromagnetic coil 34 is embedded in the fixed core 31. When the electromagnetic coil 34 is energized, it generates a force that pulls the movable core 32 toward the fixed core 31, against the pair of braking springs 33. As the movable core 32 is pulled toward the fixed core 31, the brake lining is separated from the brake rotating body, and the braking force on the drive sheave 15 is released.

[0044] A pair of support members 36 and a pair of auxiliary springs 37 are each housed in a pair of housing holes 31c. A pair of cushion rubbers 35 are each supported by a pair of support members 36.

[0045] Furthermore, the pair of cushion rubbers 35 are each displaceable together with the pair of support members 36 between the usage position and the non-usage position. The usage position is the position in which each cushion rubber 35 protrudes from the suction surface 31a and is interposed between the fixed core 31 and the movable core 32, as shown in Figure 5. The non-usage position is the position in which each cushion rubber 35 does not protrude from the suction surface 31a and is not interposed between the fixed core 31 and the movable core 32.

[0046] Each cushion rubber 35 absorbs the impact that occurs when the movable core 32 collides with the fixed core 31 when it is in the position of use. A pair of auxiliary springs 37 apply a force to each of the cushion rubbers 35 via a pair of support members 36, displacing them from the non-use position to the use position.

[0047] Figure 6 is a cross-sectional view showing the storage state of the brake device 30 shown in Figure 5. Figure 7 is a front view showing the brake device 30 shown in Figure 6. When the brake device 30 is stored, a pair of fixing bolts 38 are provided between the fixed core 31 and the movable core 32. The storage state shown in Figure 6 is maintained by tightening the pair of fixing bolts 38.

[0048] In the storage state, the pair of braking springs 33 are each compressed, and the movable iron core 32 is in contact with the suction surface 31a. Each fixing bolt 38 is passed through the through hole 32a from the opposite side of the fixing iron core 31 and screwed into the fixing screw hole 31b. As with Embodiment 1, brake release bolts can be reused as each fixing bolt 38.

[0049] Furthermore, in storage, a pair of support members 36 are pressed by a pair of fixing bolts 38, displacing a pair of cushion rubbers 35 to their unused positions. When each cushion rubber 35 is in its unused position, it is separated from the movable iron core 22. Therefore, each cushion rubber 35 is not compressed.

[0050] By removing the pair of fixing bolts 38 from the fixed iron core 31, the pair of cushion rubbers 35 are displaced to their working position by the pair of auxiliary springs 37.

[0051] In such a brake device 30, even if the movable core 32 is kept in contact with the fixed core 31 during storage, the pair of cushion rubbers 35 remain uncompressed. Therefore, permanent deformation of the pair of cushion rubbers 35 due to long-term storage can be suppressed.

[0052] This makes it possible to stably suppress noise generation caused by collisions between the movable core 32 and the fixed core 31 in the elevator hoisting machine 13 over a long period of time. As a result, the burden of maintenance work can be reduced.

[0053] Furthermore, when using the brake device 30, the pair of cushion rubbers 35 can be displaced to the usage position simply by removing the pair of fixing bolts 38 from the fixed core 31 and the movable core 32.

[0054] Furthermore, in the storage state of the brake device 30, the pair of movable iron cores 32 may be in contact with the pair of cushion rubbers 35 as long as no compressive force that would cause permanent deformation is applied to the pair of cushion rubbers 35.

[0055] Furthermore, the first core may be a movable core 32, and the second core may be a fixed core 31. In this case, a pair of cushion rubbers 35, a pair of support members 36, and a pair of auxiliary springs 37 are provided on the movable core 32.

[0056] Furthermore, the number of cushion rubbers 35, support members 36, auxiliary springs 37, and fixing bolts 38 is not limited to two, but may be one or three or more.

[0057] Furthermore, in embodiments 1 and 2, the overall layout of the elevator system is not limited to the layout shown in Figure 1. For example, the roping method may be a 1:1 roping method.

[0058] Furthermore, in embodiments 1 and 2, the elevator system may be a machine-room-less elevator, a double-deck elevator, a one-shaft multi-car elevator system, etc. In the one-shaft multi-car system, the upper car and the lower car located directly below the upper car move independently up and down a common hoistway.

[0059] Furthermore, the brake device 20 of Embodiment 1 and the brake device 30 of Embodiment 2 may be provided on equipment other than the elevator hoisting machine 13. [Explanation of Symbols]

[0060] 13 Elevator hoisting machine, 20, 30 Brake device, 21, 31 Fixed iron core, 21a, 31a Suction surface, 31b Fixing screw hole, 22, 32 Movable iron core, 32a Through hole, 22b Position adjustment screw hole, 23, 33 Braking spring, 24, 34 Electromagnetic coil, 25, 35 Cushion rubber, 26 Position adjustment bolt, 27, 38 Fixing bolt, 36 Support member, 37 Auxiliary spring.

Claims

1. A fixed iron core having a suction surface, A movable iron core that can be displaced in a direction toward or away from the suction surface, A braking spring applies a force to the movable iron core in a direction away from the aforementioned suction surface. An electromagnetic coil provided on the fixed core generates a force that attracts the movable core toward the fixed core, against the braking spring, and A cushion rubber that absorbs the impact generated when the movable iron core collides with the fixed iron core. Equipped with, During storage, the fixing bolts provided between the fixed core and the movable core are tightened, compressing the braking spring and maintaining a storage state in which the movable core is in contact with the suction surface. The cushion rubber is provided on the first core, which is either the fixed core or the movable core. Position adjustment screw holes are provided in the second core, which is the other of the fixed core and the movable core, at positions facing the cushion rubber. A position adjustment bolt is screwed into the aforementioned position adjustment screw hole. When the braking force is released during use, the tip of the position adjustment bolt comes into contact with the cushion rubber. In the storage state, the position adjustment bolt is displaced in a direction away from the cushion rubber relative to the first iron core, thereby causing at least a portion of the cushion rubber to be inserted into the position adjustment screw hole.

2. A fixed iron core having a suction surface, A movable iron core that can be displaced in a direction toward or away from the suction surface, A braking spring applies a force to the movable iron core in a direction away from the aforementioned suction surface. An electromagnetic coil provided on the fixed core generates a force that attracts the movable core toward the fixed core, against the braking spring, and A cushion rubber that absorbs the impact generated when the movable iron core collides with the fixed iron core. Equipped with, During storage, the fixing bolts provided between the fixed core and the movable core are tightened, compressing the braking spring and maintaining a storage state in which the movable core is in contact with the suction surface. The first core, which is either the fixed core or the movable core, is provided with a fixing screw hole into which the fixing bolt is screwed, and a housing hole. The second core, which is the other of the fixed core and the movable core, is provided with through holes through which the fixing bolts are passed. A support member is housed in the aforementioned housing hole. The cushion rubber is supported by the support member and is displaceable together with the support member between a usage position interposed between the fixed core and the movable core and a non-usage position not interposed between the fixed core and the movable core. The aforementioned housing hole is provided with an auxiliary spring that displaces the cushion rubber from the unused position to the used position. In the aforementioned storage state, the support member is pressed by the fixing bolt, causing the cushion rubber to be displaced to a non-use position in the brake device.

3. Brake device according to claim 1 or claim 2 An elevator hoisting machine equipped with [this feature].

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