CN110831883B

CN110831883B - Traction machine for elevator

Info

Publication number: CN110831883B
Application number: CN201780090929.XA
Authority: CN
Inventors: 品川知洋
Original assignee: Mitsubishi Electric Corp
Current assignee: Mitsubishi Electric Corp
Priority date: 2017-05-24
Filing date: 2017-05-24
Publication date: 2021-02-02
Anticipated expiration: 2037-05-24
Also published as: WO2018216145A1; CN110831883A; JP6710328B2; JPWO2018216145A1

Abstract

The invention provides a traction machine for an elevator, which can manually release the brake of a brake part to a rope pulley according to a simple flow without using a complex release mechanism. The elevator hoist of the present invention comprises: a fitting portion formed on one of an end surface of the sheave and a surface of the brake disc opposite to the end surface; and a fitted portion formed on the other surface, wherein the fitted portion and the fitted portion are configured to be fitted by an axial movement of the brake disc toward the sheave, and to be released from fitting by an axial movement of the brake disc away from the sheave, and wherein in a state in which the fitted portion and the fitted portion are fitted, rotation of the brake disc about the rotation axis is prevented, and in a state in which the brake disc is braked, the brake portion is supported by the stationary member so as to be movable in the axial direction in conjunction with the axial movement of the brake disc.

Description

Traction machine for elevator

Technical Field

The present invention relates to an elevator hoist including a brake device that operates and releases a brake by electromagnetic control, and more particularly, to an elevator hoist including a mechanism capable of manually releasing the brake of the brake device.

Background

Conventionally, in an elevator, a car and a counterweight are connected to a rope looped around a sheave of a hoisting machine, and the hoisting machine is driven by a motor to move up and down.

In the hoisting machine, a brake disc is provided coaxially with a sheave. The sheave is braked, that is, the rotation of the sheave is stopped, by a brake device having a brake shoe engaged with the brake disc.

A normally open type electromagnetic brake is used in the brake device. When the elevator is driven, the electromagnetic valve is operated, the brake shoe is separated from the brake disc, and the sheave is rotationally driven by the motor. When the power supply of the brake device is turned off when the elevator is stopped, the brake shoe is pressed against the brake disc by the brake spring. Thereby, the sheave is braked, and the car is stopped. In maintenance inspection, after the power supply of the braking device is turned off and the car is stopped at a predetermined position, the braking of the braking device may be temporarily released and the position of the car may be finely adjusted.

In view of such circumstances, a conventional electromagnetic brake release device has been proposed which includes: a ball screw connected to a brake shoe assembly composed of a brake shoe and a rod accommodated in the brake core; a ball screw nut which is engaged with the ball screw thread; a thrust bearing that receives a reaction force of the ball screw nut when released; and a release lever that can be attached to the ball screw nut (see, for example, patent document 1).

Documents of the prior art

Patent document

Patent document 1: international publication No. 2013-186867

Disclosure of Invention

Problems to be solved by the invention

Conventional electromagnetic brake release devices are each mounted to a brake device provided at a plurality of positions with respect to a brake disc. Therefore, the operability of releasing the braking of the sheave is deteriorated in order to sequentially release the braking of the braking devices provided at a plurality of places.

In addition, in the conventional electromagnetic brake device, the operation force of the release lever for contracting the brake spring is reduced by using the ball screw, the ball screw nut, and the thrust bearing, and therefore, the manual release structure of the brake becomes complicated.

The present invention has been made to solve the above problems, and an object of the present invention is to provide an elevator hoisting machine capable of manually releasing braking of a sheave by a braking unit in a simple flow without using a complicated release mechanism.

Means for solving the problems

The elevator hoist of the present invention comprises: an electric motor; a sheave fixed to a rotating shaft of the motor; a brake disc attached to an axially outer end surface of the sheave; and a braking portion supported by a stationary member disposed on a side of the brake disc opposite to the sheave, the stationary member facing the brake disc, the elevator hoisting machine including: a fitting portion formed on one of the end surface of the sheave and a surface of the brake disc opposite to the end surface; and a fitted portion formed on the other surface, wherein the fitted portion and the fitted portion are configured to be fitted by an axial movement of the brake disc toward the sheave, and to be released from fitting by an axial movement of the brake disc away from the sheave, and wherein in a state in which the fitted portion and the fitted portion are fitted, rotation of the brake disc about the rotation axis is prevented, and in a state in which the brake disc is braked, the brake portion is supported by the stationary member so as to be movable in the axial direction in conjunction with the axial movement of the brake disc.

Effects of the invention

According to the present invention, the fitting portion and the fitted portion are configured to be released from fitting by axial movement of the brake disc away from the sheave, and the braking portion is supported by the stationary member so as to be movable in the axial direction in conjunction with the axial movement of the brake disc in a state where the brake disc is braked. Therefore, the engagement between the brake disc and the sheave can be released by simply moving the brake disc in the axial direction, and the braking of the sheave can be released. Thus, the braking of the sheave can be manually released without using a complicated release mechanism, and the manual release flow of the braking of the sheave is simplified.

Drawings

Fig. 1 is a schematic diagram illustrating an overall structure of an elevator according to embodiment 1 of the present invention.

Fig. 2 is a side view showing an elevator hoisting machine according to embodiment 1 of the present invention.

Fig. 3 is a front view showing an elevator hoisting machine according to embodiment 1 of the present invention.

Fig. 4 is a main part cross-sectional view showing a state in which a brake disc and a sheave are fitted to each other in a brake device of an elevator hoisting machine according to embodiment 1 of the present invention.

Fig. 5 is a main part cross-sectional view showing a state where the engagement between the brake disc and the sheave is released in the elevator hoisting machine braking device according to embodiment 1 of the present invention.

Fig. 6 is a sectional view taken along line VI-VI of fig. 3.

Fig. 7 is a cross-sectional view showing a braking process of the elevator hoisting machine braking device according to embodiment 1 of the present invention.

Fig. 8 is a cross-sectional view showing a braking state of the braking device for an elevator hoisting machine according to embodiment 1 of the present invention.

Detailed Description

Embodiment 1.

Fig. 1 is a schematic diagram for explaining the overall configuration of an elevator according to embodiment 1 of the present invention, fig. 2 is a side view showing an elevator hoisting machine according to embodiment 1 of the present invention, and fig. 3 is a front view showing the elevator hoisting machine according to embodiment 1 of the present invention.

In fig. 1 to 3, the hoisting machine 3 is installed in the machine room 2 at the upper portion in the hoistway 1 with the axial direction of the rotating shaft 4a horizontal. The main rope 7 is wound around the sheave 5 and the deflector sheave 6 of the hoisting machine 3 and hangs down in the hoistway 1. The car 8 is connected to one end of the main rope 7, and the counterweight 9 is connected to the other end of the main rope 7 and suspended in the hoistway 1. The hoisting machine 3 is driven, and the car 8 and the counterweight 9 are guided by guide rails (not shown) to move up and down in the hoistway 1.

The hoisting machine 3 is provided on a stand 10, and includes a motor 4, a sheave 5 fixed to a rotating shaft 4a of the motor 4, and a brake device 20. The brake device 20 includes: a brake disc 21 mounted on the sheave 5 so as to be rotatable together; and a brake unit 30 attached to the flange 11 as a stationary member attached to the frame 10, and configured to brake and release the brake disc 21.

Next, the brake device 20 will be described with reference to fig. 4 to 8. Fig. 4 is a partial cross-sectional view showing a state in which a brake disc and a sheave are fitted to each other in an elevator hoisting machine braking device according to embodiment 1 of the present invention, fig. 5 is a partial cross-sectional view showing a state in which the fitting of the brake disc and the sheave is released in the elevator hoisting machine braking device according to embodiment 1 of the present invention, fig. 6 is a sectional view taken along direction VI-VI in fig. 3, fig. 7 is a cross-sectional view showing a braking process in the elevator hoisting machine braking device according to embodiment 1 of the present invention, and fig. 8 is a cross-sectional view showing a braking state in the elevator hoisting machine braking device according to embodiment 1 of the present invention.

The brake disk 21 is formed in a circular plate shape having a center hole 21 a. A plurality of fitting recesses 22 as fitted portions are formed on one surface of the brake disk 21. A plurality of springs 23 are attached so that one end thereof is fixed to one surface of the brake disk 21. The spring seat members 24 are fixed to the respective other ends of the springs 23.

A plurality of fitting convex portions 25 as fitting portions are formed on one end surface of the sheave 5 in the axial direction so as to be fittable into the fitting concave portions 22. The engaging groove 26 is formed concentrically around the axial center of the sheave 5 on one axial end side of the outer peripheral surface of the sheave 5.

The sheave 5 is press-fitted or shrink-fitted to insert and fix the rotary shaft 4a of the motor 4 into the center hole 5 a. The brake disc 21 is moved in the direction of the sheave 5 in the axial direction of the rotating shaft 4a, and is attached to the sheave 5 by inserting the protruding portion of the rotating shaft 4a protruding from the center hole 5a of the sheave 5 into the center hole 21a and fitting the fitting concave portion 22 and the fitting convex portion 25. Then, the spring 23 is extended, and the spring seat member 24 is fitted into the engagement groove 26. Thereby, the restoring force of the spring 23 pulls the brake disc 21 toward the sheave 5, and one surface of the brake disc 21 abuts on one end surface in the axial direction of the sheave 5.

In this way, the brake disc 21 is attached to the sheave 5 while the fitting state of the fitting concave portion 22 and the fitting convex portion 25 is maintained by the restoring force of the spring 23, and the rotation of the brake disc 21 about the rotation axis 4a with respect to the sheave 5 is prevented. That is, the brake disc 21 is mounted to the sheave 5 so as to be rotatable together.

Further, if the brake disk 21 is gripped and the spring 23 is pulled to move the brake disk 21 to the left in fig. 5, the fitting between the fitting concave portion 22 and the fitting convex portion 25 is released. Here, when the sheave 5 is rotationally driven by the rotating shaft 4a, the spring receiving member 24 slides on the inner wall surface of the engagement groove 26, and the rotational torque of the sheave 5 is not transmitted to the brake disc 21. That is, the spring receiving member 24 is attached to the engagement groove 26 so as to be restricted from moving in the axial direction and allowed to move in the circumferential direction.

As shown in fig. 6, the brake unit 30 includes: an armature 31 made of a magnetic material; a 1 st brake shoe 32 coupled to the armature 31; an electromagnetic field member 33 made of a magnetic material; an electromagnetic coil 34 attached to the electromagnetic field member 33 and excited to generate a magnetic attraction force; a brake spring 35 that generates braking force; a 2 nd brake shoe 36 which is disposed so as to face the 1 st brake shoe 32 with the brake disc 21 interposed therebetween, and which applies pressure to the brake disc 21 between the 1 st brake shoe 32 and the brake shoe to brake the brake disc 21; a bracket member 37 that holds the 2 nd brake shoe 36; a coupling portion 38 that couples the electromagnetic field member 33 and the holder member 37; and a return spring 39.

The brake unit 30 configured as described above is attached to the flange 11 such that the connection portion 38 penetrates the flange 11 and the brake disk 21 is positioned between the 1 st brake shoe 32 and the 2 nd brake shoe 36. At this time, the flange 11 is disposed on the opposite side of the brake disc 21 from the sheave 5 so as to face the brake disc 21. Further, the coupling portion 38 is slidable relative to the flange 11 in the axial direction of the rotary shaft 4 a. The armature 31 is capable of reciprocating in the axial direction of the rotary shaft 4 a. The pin 40 is erected on the holder member 37, penetrates the flange 11, and protrudes toward the electromagnetic field member 33. The return spring 39 is attached to the pin 40 and disposed between the holder member 37 and the flange 11.

Next, the operation of the brake device 20 will be described.

First, when the electromagnetic coil 34 is energized, the head of the pin 40 abuts against the surface of the flange 11 on the electromagnetic field member 33 side, and the electromagnetic field member 33, the bracket member 37, and the coupling portion 38 are moved to the left in fig. 6 by the biasing force of the return spring 39. At the same time, the armature 31 magnetically attracted by the electromagnetic field member 33 also moves to the left in fig. 6 together with the electromagnetic field member 33. When the biasing force of the return spring 39 is released, the movement of the armature 31 and the electromagnetic field member 33, the bracket member 37, the connection portion 38, and the combination thereof is stopped, and the 1 st brake shoe 32 and the 2 nd brake shoe 36 are held at positions separated from the brake disc 21. That is, the brake device 20 is in the brake released state.

Thus, the sheave 5 is rotationally driven by the motor 4. Thereby, the car 8 moves up and down in the hoistway 1.

When the power supply to the brake device 20 is turned off when the elevator is stopped, the magnetic attraction force generated by the electromagnetic coil 34 disappears. Thereby, the armature 31 is moved to the left in fig. 6 by the urging force of the brake spring 35, and the 1 st brake shoe 32 comes into contact with the brake disc 21 as shown in fig. 7. Then, the armature 31 is further moved to the left in fig. 7 by the urging force of the brake spring 35. As a result, a reaction force acts on the electromagnetic field member 33 via the armature 31, and the electromagnetic field member 33 moves to the right in fig. 7 while contracting the return spring 39. As shown in fig. 8, the 2 nd brake shoe 36 abuts against the brake disc 21. Thereby, the brake disc 21 is pressed and held between the 1 st brake shoe 32 and the 2 nd brake shoe 36 by the biasing force of the brake spring 35, and the brake disc 21 is braked. That is, the brake device 20 is in the braking state.

Here, when the brake of the brake device 20 is temporarily released and the position of the car 8 is finely adjusted during maintenance inspection, the operator grips the brake disc 21 and moves the brake disc 21 to the left in fig. 5 while stretching the spring 23. Thereby, the fitting between the fitting concave portion 22 and the fitting convex portion 25 is released, and the braking state of the sheave 5 is released. Therefore, the motor 4 can be rotationally driven to move the car 8 to a desired position. Further, if the operator grips the brake disc 21 and fits the fitting concave portion 22 and the fitting convex portion 25, the braking state of the sheave 5 can be returned.

According to embodiment 1, the fitting concave portion 22 is formed on one surface of the brake disc 21, and the fitting convex portion 25 is formed on the end surface of the sheave 5. The brake disc 21 is moved in the direction of the sheave 5 in the axial direction of the rotating shaft 4a, whereby the fitting concave portion 22 is fitted to the fitting convex portion 25. Thereby, the brake disc 21 is attached to the sheave 5 so as to be restricted from rotating about the rotating shaft 4 a. By separating the brake disc 21 from the sheave 5 in the axial direction of the rotating shaft 4a, the fitting between the fitting concave portion 22 and the fitting convex portion 25 is released. This releases the engagement with the sheave 5 whose rotation about the rotation shaft 4a is restricted.

Since the connection portion 38 is slidable in the axial direction of the rotary shaft 4a relative to the flange 11, the brake portion 30 can move in conjunction with the release of the brake disc 21 from engagement with the sheave 5 in a state where the brake disc 21 is braked. Therefore, the braking of the sheave 5 can be manually released only by separating the brake disc 21 from the sheave 5 in the axial direction.

Thus, the braking of the sheave 5 can be released only by moving the brake disc 21 in the axial direction, and there is no need to release the braking of each braking portion 30, so that the flow of releasing the braking of the sheave 5 is simplified, and the brake releasing operability of the sheave 5 is improved.

Since the brake disc 21 is coupled to the sheave 5 by fitting the fitting concave portion 22 and the fitting convex portion 25, a special mechanism for manually releasing the brake of the sheave 5 is not required, and the manual release of the brake of the sheave 5 can be achieved with a simple configuration.

Since the spring 23 is arranged to bias the brake disc 21 in the direction of the sheave 5, the brake disc 21 is pressed against the end surface of the sheave 5 in a normal state, and the fitting state of the fitting concave portion 22 and the fitting convex portion 25 is reliably maintained. Furthermore, the spring force of the spring 23 is very small compared to the spring force of the brake spring 35. Therefore, the brake spring 35 does not participate in the brake release operation of the sheave 5, and only the spring 23 participates in the brake release operation of the sheave 5, so that the work load is significantly reduced.

The return spring 39 disposed between the bracket member 37 and the flange 11 biases the brake disc 21 in the direction of the sheave 5 in a state where the brake disc 21 is braked by the brake section 30. Therefore, when braking is performed by the braking device 20, the fitting between the fitting concave portion 22 and the fitting convex portion 25 is not disengaged, and braking of the sheave 5 is reliably ensured.

In embodiment 1, the brake disc 21 is pressed against the sheave 5 with the fitting concave portion 22 fitted to the fitting convex portion 25 by the biasing force of the spring 23, but the brake disc 21 may be fixed to the sheave 5 with a bolt with the fitting concave portion 22 fitted to the fitting convex portion 25. In this case, after the bolts are removed, the brake disc 21 is pulled away from the sheave 5, and the fitting between the fitting concave portion 22 and the fitting convex portion 25 is released.

In embodiment 1, 4 braking portions 30 are arranged on the flange 11 so as to be separated in the circumferential direction, but the number of braking portions 30 is not limited to this.

In embodiment 1, the fitting concave portion 22 is provided on one surface of the brake disc 21, and the fitting convex portion 25 is provided on the end surface of the sheave 5 facing the one surface of the brake disc 21, but the fitting convex portion 25 may be provided on one surface of the brake disc 21, the fitting concave portion 22 may be provided on the end surface of the sheave 5, or both the fitting concave portion 22 and the fitting convex portion 25 may be provided on one surface of the brake disc 21 and each of the end surfaces of the sheave 5.

Description of the reference symbols

4: an electric motor; 4 a: a rotating shaft; 5: a sheave; 11: flanges (stationary parts); 21: a brake disc; 22: a fitting recess (fitted portion); 23: a spring; 24: a spring seat member; 25: a fitting projection (fitting portion); 26: an engaging groove.

Claims

1. An elevator hoist is provided with:

an electric motor;

a sheave fixed to a rotating shaft of the motor;

a brake disc attached to an axially outer end surface of the sheave; and

a braking portion supported by a stationary member disposed on a side of the brake disc opposite to the sheave, the stationary member facing the brake disc,

the elevator hoist comprises: a fitting portion formed on one of the end surface of the sheave and a surface of the brake disc opposite to the end surface; and a fitted portion formed on the other surface,

the fitting portion and the fitted portion are configured to be fitted to each other by axial movement of the brake disc toward the sheave and to be released from each other by axial movement of the brake disc away from the sheave,

the brake disk is prevented from rotating about the rotation axis in a state where the fitting portion is fitted to the fitted portion,

the brake portion is supported by the stationary member so as to be movable in the axial direction in conjunction with the axial movement of the brake disc in a state where the brake disc is braked.

2. The hoisting machine for an elevator according to claim 1, wherein,

the elevator hoist is provided with:

an engaging groove formed in a concentric circle shape around an axial center of the rotating shaft at an axially outer portion of an outer peripheral surface of the sheave;

a spring seat member attached to the engagement groove so as to be restricted from moving in an axial direction and allowed to move in a circumferential direction; and

and a spring member disposed between the spring seat member and the brake disc, and biasing the brake disc in a direction of the sheave.

3. The hoisting machine for elevator according to claim 1 or 2, wherein,

the braking portion is a floating type braking portion that biases the brake disc in the direction of the sheave in a state where the brake disc is braked.