Brake device and elevator hoist

Abstract

An object of the present invention is to provide a braking device and an elevator hoist that can suppress the occurrence of permanent distortion in a cushion rubber due to long-term storage. 【Solution means】In the storage state, the pair of position adjustment bolts 26 are displaced in a direction away from the pair of cushion rubbers 25 with respect to the movable iron core 22. As a result, at least a part 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 separated 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 magnetic core of an electromagnet facing a movable core. The buffer member absorbs an impact generated when the movable core collides with the electromagnet (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. For this reason, the hoist brake is configured such that the buffer member is not compressed by the movable core when the brake is generating braking force 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 electromagnet, and the hoist brake is stored with the movable core applied to the electromagnet. For this reason, in a hoist brake stored for a long time, permanent distortion may occur in the buffer member, and the state may be such that the impact generated when the movable core collides with the electromagnet cannot be sufficiently absorbed.

[0006] The present disclosure has been made to solve the above-described problems, and an object thereof is to obtain a braking device and an elevator hoisting machine that can suppress the occurrence of permanent distortion in the cushion rubber due to long-term storage.

Means for Solving the Problems

[0007] The braking device according to the present disclosure includes a fixed iron core having a suction surface, a movable iron core displaceable in a direction approaching and separating from the suction surface, a braking spring applying a force in a direction away from the suction surface to the movable iron core, an electromagnetic coil provided on the fixed iron core and generating a force for attracting the movable iron core toward the fixed iron core against the braking spring, and a cushion rubber for absorbing an impact generated when the movable iron core collides with the fixed iron core. During storage, the fixed bolt provided between the fixed iron core and the movable iron core is tightened, so that the braking spring is compressed and the storage state in which the movable iron core contacts the suction surface is maintained. The cushion rubber is provided on a first iron core which is either the fixed iron core or the movable iron core, and a position adjustment screw hole is provided at a position facing the cushion rubber in a second iron core which is the other of the fixed iron core and the movable iron core. A position adjustment bolt is screwed into the position adjustment screw hole. When the braking force is released in the use state, the tip of the position adjustment bolt contacts the cushion rubber. In the storage state, the position adjustment bolt is displaced in a direction away from the cushion rubber with respect to the second iron core, so that at least a part of the cushion rubber is inserted into the position adjustment screw hole. Furthermore, the brake device according to the present disclosure includes a fixed iron core having a suction surface, a movable iron core displaceable in a direction approaching and separating from the suction surface, a braking spring applying a force in a direction away from the suction surface to the movable iron core, an electromagnetic coil provided on the fixed iron core and generating a force to attract the movable iron core toward the fixed iron core against the braking spring, and a cushion rubber for absorbing an impact generated when the movable iron core collides with the fixed iron core. During storage, the fixed bolt provided between the fixed iron core and the movable iron core is tightened, so that the braking spring is compressed and the movable iron core is in contact with the suction surface, maintaining the storage state. One of the fixed iron core and the movable iron core, i.e., the first iron core, is provided with a fixed screw hole into which the fixed bolt is screwed and a receiving hole, and the other of the fixed iron core and the movable iron core, i.e., the second iron core, is provided with a through hole through which the fixed bolt passes. A support member is accommodated in the receiving hole, the cushion rubber is supported by the support member, and the cushion rubber is displaceable together with the support member between a use position intervening between the fixed iron core and the movable iron core and a non-use position not intervening between the fixed iron core and the movable iron core. The receiving hole is provided with an auxiliary spring for displacing the cushion rubber from the non-use position to the use position. In the storage state, the support member is pushed by the fixed bolt, and the cushion rubber is displaced to the non-use position.

Advantages of the Invention

[0008] According to the present disclosure, it is possible to suppress the occurrence of permanent distortion in the cushion rubber due to long-term storage of the brake device.

Brief Description of the Drawings

[0009]

Figure 1

Figure 2

Figure 3

Figure 4

Figure 5

Figure 6

Figure 7

Mode for Carrying Out the Invention

[0010] Hereinafter, embodiments will be described with reference to the drawings. Embodiment 1. FIG. 1 is a schematic configuration diagram showing an elevator device 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 by the support beam 12. The elevator hoisting machine 13 has a hoisting machine main body 14 and a drive sheave 15.

[0011] A suspension body 16 is wound around the drive sheave 15. As the suspension body 16, a plurality of ropes or a plurality of belts are used.

[0012] The car 17 and the counterweight 18 are suspended in the hoistway 11 by the suspension body 16. Further, the car 17 and the counterweight 18 move up and down in the hoistway 11 by rotating the drive sheave 15.

[0013] In the hoistway 11, a pair of car guide rails (not shown) and a pair of counterweight guide rails (not shown) are installed. The pair of car guide rails guide the up and down movement of the car 17. The pair of counterweight guide rails guide the up and down movement of the counterweight 18.

[0014] FIG. 2 is a cross-sectional view schematically showing the main part of the brake device provided on the hoisting machine main body 14 of FIG. 1. The hoisting machine main body 14 has 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 braking device 20 holds the drive sheave 15 in a stationary state. Also, the braking device 20 brakes the rotation of the drive sheave 15.

[0016] The braking 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 and 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 of Embodiment 1 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 brake springs 23 are provided between the fixed iron core 21 and the movable iron core 22. Also, the pair of brake springs 23 apply a force in a direction away from the suction surface 21a to the movable iron core 22. The brake lining is pressed against the brake rotating body via the movable iron core 22 and the brake shoe by the pair of brake springs 23. Thereby, a braking force is applied to the drive sheave 15. FIG. 2 shows the state where the braking force is applied to the braking device 20.

[0022] The electromagnetic coil 24 is provided on the fixed iron core 21. Also, the electromagnetic coil 24 is embedded in the fixed iron core 21. Further, when the electromagnetic coil 24 is excited, it generates a force to attract the movable iron core 22 toward the fixed iron core 21 against the pair of brake springs 23. When the movable iron core 22 is attracted toward the fixed iron 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 iron core of the first embodiment is the fixed iron core 21. Also, the pair of cushion rubbers 25 protrude from the suction surface 21a toward the movable iron core 22 side. Further, the pair of cushion rubbers 25 absorb the impact generated when the movable iron core 22 collides with the fixed iron core 21.

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

[0025] A pair of position adjustment screw holes 22b are respectively provided at positions on the movable iron core 22 facing the pair of cushion rubbers 25. When the braking force is released in the usage state of the braking device 20, that is, when the movable iron core 22 is attracted toward the fixed iron core 21 side, the tips of the pair of position adjustment bolts 26 respectively hit the pair of cushion rubbers 25.

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

[0027] The storage state is a state in which a pair of brake springs 23 are each compressed and the movable core 22 abuts against the suction surface 21a. The fixing bolt 27 is passed through the through hole 22a from the side opposite to the fixed core 21 and screwed into the fixing screw hole 21b.

[0028] As the fixing bolt 27, a brake release bolt can be diverted. 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 of the elevator hoisting machine 13 such as the replacement work of the brake lining.

[0029] Also, in the storage state, the pair of position adjustment bolts 26 are displaced in a direction away from the pair of cushion rubbers 25 with respect to the movable core 22. As a result, at least a part 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 when the state where the movable core 22 is applied to the fixed core 21 is maintained during storage, the pair of cushion rubbers 25 are kept in a non-compressed state. Therefore, it is possible to suppress the occurrence of permanent distortion in the pair of cushion rubbers 25 due to long-term storage.

[0031] Thereby, in the elevator hoisting machine 13, the generation of noise due to the collision between the movable core 22 and the fixed core 21 can be stably suppressed over a long period. Therefore, the load of maintenance work can be reduced.

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

[0033] In addition, in the storage state of the brake device 20, if a compressive force that causes permanent distortion is not applied to the pair of cushion rubbers 25, the pair of position adjustment bolts 26 may be in contact with the pair of cushion rubbers 25 respectively.

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

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

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

[0037] The brake device 30 includes a fixed iron core 31, a movable iron core 32, a brake shoe (not shown), a brake lining (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 iron core 31 has a suction surface 31a. The fixed iron core 31 is provided with a pair of fixed screw holes 31b and a pair of accommodation holes 31c. That is, the first iron core of Embodiment 2 is the fixed iron core 31.

[0039] The movable iron core 32 faces the attracting surface 31a. Also, the movable iron core 32 is displaceable in a direction approaching and separating from the attracting surface 31a.

[0040] The movable iron core 32 is provided with a pair of through holes 32a. That is, the second iron core of the second embodiment is the movable iron core 22. The pair of through holes 32a are respectively located on the extension lines of the fixing screw holes 31b.

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

[0042] A pair of braking springs 33 are provided between the fixed iron core 31 and the movable iron core 32. Also, the pair of braking springs 33 apply a force in a direction away from the attracting surface 31a to the movable iron core 32. The brake lining is pressed against the brake rotating body via the movable iron core 32 and the brake shoe by the pair of braking springs 33. Thereby, a braking force is applied to the drive sheave 15. FIG. 5 shows the state where the braking force of the brake device 30 is applied.

[0043] The electromagnetic coil 34 is provided on the fixed iron core 31. Also, the electromagnetic coil 34 is embedded in the fixed iron core 31. Further, when the electromagnetic coil 34 is excited, it generates a force to attract the movable iron core 32 toward the fixed iron core 31 against the pair of braking springs 33. When the movable iron core 32 is attracted toward the fixed iron 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 respectively accommodated in a pair of accommodation holes 31c. A pair of cushion rubbers 35 are respectively supported by the pair of support members 36.

[0045] Further, the pair of cushion rubbers 35 can be displaced together with the pair of support members 36 between the use position and the non-use position. The use position is the position where each cushion rubber 35 protrudes from the suction surface 31a, and is the position where each cushion rubber 35 is interposed between the fixed core 31 and the movable core 32, as shown in FIG. 5. The non-use position is the position where each cushion rubber 35 does not protrude from the suction surface 31a, and is the position where each cushion rubber 35 is not interposed between the fixed core 31 and the movable core 32.

[0046] When each cushion rubber 35 is in the use position, it absorbs the impact generated when the movable core 32 collides with the fixed core 31. The pair of auxiliary springs 37 apply a force to displace the pair of cushion rubbers 35 from the non-use position to the use position via the pair of support members 36, respectively.

[0047] FIG. 6 is a cross-sectional view showing the storage state of the brake device 30 in FIG. 5. FIG. 7 is a front view showing the brake device 30 in FIG. 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. Then, by tightening the pair of fixing bolts 38, the storage state shown in FIG. 6 is maintained.

[0048] The storage state is a state in which the pair of braking springs 33 are each compressed and the movable core 32 is in contact with the suction surface 31a. Each fixing bolt 38 is passed through the through hole 32a from the side opposite to the fixed core 31 and screwed into the fixing screw hole 31b. As each fixing bolt 38, a brake release bolt can be diverted as in the first embodiment.

[0049] Also, in the storage state, the pair of support members 36 are pushed by the pair of fixing bolts 38, and the pair of cushion rubbers 35 are displaced to the non-use position. When each cushion rubber 35 is in the non-use position, it is separated from the movable core 22. Therefore, each cushion rubber 35 is not compressed.

[0050] When a pair of fixing bolts 38 are removed from the fixed core 31, a pair of cushion rubbers 35 are displaced to their use positions by a 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, a pair of cushion rubbers 35 are kept in a non-compressed state. Therefore, it is possible to suppress the occurrence of permanent distortion in the pair of cushion rubbers 35 due to long-term storage.

[0052] As a result, in the elevator hoist 13, the generation of noise due to the collision between the movable core 32 and the fixed core 31 can be stably suppressed over a long period. Therefore, the load of maintenance work can be reduced.

[0053] Also, when the brake device 30 is in use, a pair of cushion rubbers 35 can be displaced to their use positions simply by removing a pair of fixing bolts 38 from the fixed core 31 and the movable core 32.

[0054] Note that in the stored state of the brake device 30, the pair of movable cores 32 may be in contact with the pair of cushion rubbers 35 as long as a compressive force that causes permanent distortion is not applied to the pair of cushion rubbers 35.

[0055] Also, the first core may be the movable core 32, and the second core may be the 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] Also, the numbers of the cushion rubbers 35, the support members 36, the auxiliary springs 37, and the fixing bolts 38 are not limited to two each, and may be one or three or more each.

[0057] Also, in Embodiments 1 and 2, the layout of the entire elevator device is not limited to the layout of FIG. 1. For example, the roping method may be a 1:1 roping method.

[0058] Also, in Embodiments 1 and 2, the elevator device may be a machine-roomless elevator, a double-deck elevator, a one-shaft multi-car type elevator device, or the like. The one-shaft multi-car type is a system in which an upper car and a lower car arranged directly below the upper car move up and down in a common hoistway independently.

[0059] Also, the brake device 20 of Embodiment 1 and the brake device 30 of Embodiment 2 may be provided in equipment other than the elevator hoist 13.

Description of Reference Numerals

[0060] 13 elevator hoist, 20, 30 brake device, 21, 31 fixed core, 21a, 31a suction surface, 31b fixed screw hole, 22, 32 movable core, 32a through hole, 22b position adjustment screw hole, 23, 33 brake 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 stationary iron core having an attracting surface, A movable iron core displaceable in a direction approaching and separating from the attracting surface, A braking spring applying a force in a direction away from the attracting surface to the movable iron core, An electromagnetic coil provided on the stationary iron core and generating a force for attracting the movable iron core toward the stationary iron core against the braking spring, and A cushion rubber for absorbing an impact generated when the movable iron core collides with the stationary iron core are provided, During storage, a fixing bolt provided between the stationary iron core and the movable iron core is tightened, so that the braking spring is compressed and a storage state is maintained in which the movable iron core contacts the attracting surface, The cushion rubber is provided on a first iron core which is either the stationary iron core or the movable iron core, A position adjustment screw hole is provided at a position facing the cushion rubber in a second iron core which is the other of the stationary iron core and the movable iron core, A position adjustment bolt is screwed into the position adjustment screw hole, When releasing the braking force in the operating state, the tip of the position adjustment bolt contacts the cushion rubber, In the storage state, the position adjustment bolt is displaced in a direction away from the cushion rubber with respect to the first iron core, so that at least a part of the cushion rubber is inserted into the position adjustment screw hole, a braking device.

2. A stationary iron core having an attracting surface, A movable iron core displaceable in a direction approaching and separating from the attracting surface, A braking spring applying a force in a direction away from the attracting surface to the movable iron core, An electromagnetic coil provided on the stationary iron core and generating a force for attracting the movable iron core toward the stationary iron core against the braking spring, and A cushion rubber for absorbing an impact generated when the movable iron core collides with the stationary iron core are provided, During storage, a fixing bolt provided between the stationary iron core and the movable iron core is tightened, so that the braking spring is compressed and a storage state is maintained in which the movable iron core contacts the attracting surface, A fixing screw hole into which the fixing bolt is screwed and a housing hole are provided in a first iron core which is either the stationary iron core or the movable iron core, A through hole through which the fixing bolt passes is provided in a second iron core which is the other of the stationary iron core and the movable iron core, A support member is housed in the housing hole, The cushion rubber is supported by the support member and 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 for displacing the cushion rubber from the non-use position to the use position is provided in the accommodation hole. In the storage state, a brake device in which the support member is pushed by the fixing bolt and the cushion rubber is displaced to the non-use position.

3. An elevator hoisting machine comprising the brake device according to claim 1 or claim 2. ​

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