WO2006098166A1

WO2006098166A1 - Brake auxiliary device of elevator

Info

Publication number: WO2006098166A1
Application number: PCT/JP2006/304090
Authority: WO
Inventors: Takuo Kugiya
Original assignee: Mitsubishi Denki Kabushiki Kaisha
Priority date: 2005-03-15
Filing date: 2006-03-03
Publication date: 2006-09-21
Also published as: JPWO2006098166A1; EP1860055A1; KR20070065294A; CN1968885A

Abstract

A brake auxiliary device of an elevator, wherein the rotation of a pulley around which a main rope is wrapped is braked by a brake device to urgently stop a car. The brake auxiliary device installed in the pulley comprises a rotatable brake auxiliary roller pressing the main rope against the pulley in an emergent braking. In normal state, the brake auxiliary roller is separated from the main rope.

Description

Specification

Elevator Brake Assist Device Technical Field

TECHNICAL FIELD [0001] The present invention relates to an elevator brake assisting device that assists in braking and braking during emergency braking.

Background art

In the conventional device, if the braking force at the time of emergency braking by the braking device is excessive, slip occurs between the sheave and the main rope. In order to prevent this slippage from increasing, the conventional braking control system detects and compares the rotational speed of the sheave and the lifting / lowering speed of the car to calculate the slipping speed. During emergency braking, the slipping speed is calculated. When the torque exceeds a predetermined value, the braking torque of the braking device is limited (see, for example, Patent Document 1).

[0003] Patent Document 1: Japanese Patent Application Laid-Open No. 2004-231355

Disclosure of the invention

Problems to be solved by the invention

[0004] The conventional braking control device as described above requires a plurality of special functions, such as a function of limiting the braking torque of the braking device when the speed of the main rope slip exceeds a predetermined value. Therefore, the configuration becomes complicated.

[0005] The present invention has been made to solve the above-described problems, and an object of the present invention is to provide an elevator brake that can suppress slippage of the main rope during emergency braking with a simpler configuration. It is to provide an auxiliary device.

Means for solving the problem

[0006] An elevator brake auxiliary device according to the present invention includes a rotatable brake auxiliary roller that presses a main rope against a sheave braked by the brake device during emergency braking.

FIG. 1 is a configuration diagram showing an elevator apparatus according to Embodiment 1 of the present invention.

2 is an enlarged front view showing the brake device of FIG. FIG. 3 is an enlarged perspective view showing the sheave and the brake auxiliary device of FIG. 1.

FIG. 4 is a front view showing the brake auxiliary device of FIG.

FIG. 5 is a front view showing a state of the brake auxiliary device of FIG. 3 during emergency braking.

FIG. 6 is an explanatory diagram for explaining slippage of the main rope with respect to the sheave shown in FIG.

BEST MODE FOR CARRYING OUT THE INVENTION

Hereinafter, preferred embodiments of the present invention will be described with reference to the drawings.

Embodiment 1.

FIG. 1 is a configuration diagram showing an elevator apparatus according to Embodiment 1 of the present invention. In the figure, a driving device 1 and a deflector 2 are arranged at the upper part of the hoistway. The driving device 1 includes an electric motor 5 that generates driving force, a sheave 6 that is rotated by the driving force of the electric motor 5, a brake device 7 that brakes the rotation of the sheave 6, and braking of the car 10 during emergency braking. And an auxiliary brake auxiliary device 8. A plurality of main ropes 9 are hung on the sheave 6 and the deflector 2. The force 10 and the counterweight 11 are suspended in the hoistway by the main rope 9.

FIG. 2 is an enlarged front view showing the brake device 7 of FIG. In the figure, a brake fixing base 15 is fixed to the upper part of the hoistway. A pair of brake arms 16 are attached to the brake fixed base 15. Each brake arm 16 can swing around a base end portion attached to a brake fixing base 15. A brake shoe 17 is fixed between the base end portion and the tip end portion of each brake arm 16. A brake spring 18 and a brake release portion 19 are attached to the distal end portion of the brake arm 16. Between the brake shoes 17, a brake drum 20 connected coaxially to the sheave 6 is disposed.

[0010] The brake spring 18 presses the brake shoe 17 against the brake drum 20 during braking.

The rotation of the sheave 6 is controlled by the brake drum 20 being pinched by the brake shoe 17. The brake release unit 19 pulls the brake 17 away from the brake drum 20 against the brake spring 18 when the brake is released, and also releases the brake spring 18 when braking.

[0011] As the brake release portion 19, for example, an electromagnetic magnet or the like is used. Brake release When an electromagnetic magnet is used as the part 19, the electromagnetic magnet is energized and the brake shoe 17 is separated from the brake drum 20 when the force 10 travels normally. During emergency braking, the electromagnetic magnet is de-energized and the brake shoe 17 is pressed against the brake drum ₂₀ .

FIG. 3 is an enlarged perspective view showing the sheave 6 and the brake auxiliary device 8 of FIG. In the figure, a sheave mounting base 25 is fixed to the upper part of the hoistway. A rotating shaft 5a of the electric motor 5 is rotatably supported on the sheave mounting base 25. A sheave 6 is fixed to the rotary shaft 5a. The sheave 6 is rotated integrally with the rotation shaft 5a around the rotation shaft 5a.

A support frame 26 is fixed to the sheave mounting base 25. The brake assisting device 8 is supported on the support frame 26. The brake auxiliary device 8 is disposed so as to face the outer peripheral surface of the sheave 6.

FIG. 4 is a front view showing the brake auxiliary device 8 of FIG. 3, and shows a normal state. In the figure, a support arm 28 is fixed to the upper part of the support frame 26. A pressing plate 29 and an auxiliary device opening 30 are attached to the lower portion of the support arm 28. The pressing plate 29 is fixed to the lower part of the support arm 28. A movable frame 31 is connected to the auxiliary device opening 30. The movable frame 31 is connected to the lower part of the support arm 28 via the auxiliary device opening 30 so as to be displaceable.

A pair of roller mounting arms 33 is fixed to the outer peripheral portion of the movable frame 31. A brake auxiliary roller 35 is rotatably mounted between the tip ends of the roller mounting arms 33. The brake auxiliary roller 35 is disposed so as to face the top of the sheave 6. The brake auxiliary roller 35 has a plurality of auxiliary roller portions 35 a corresponding to the grooves 6 a of the sheave 6. A roller groove 35b along the surface of the main rope 9 is provided on the outer periphery of each auxiliary roller portion 35a. All the auxiliary roller portions 35a are integrally formed on the outer peripheral portion of the brake auxiliary roller 35.

A plurality of auxiliary device springs 38 are disposed between the pressing plate 29 and the bottom of the movable frame 31. That is, the auxiliary device spring 38 is held between the pressing plate 29 and the bottom of the movable frame 31. The auxiliary device spring 38 is connected to the brake via the movable frame 31 and the roller mounting arm 33. Push auxiliary roller 35 toward main rope 9 side. The brake auxiliary roller 35 is pressed against the main rope 9 by being biased by the auxiliary device spring 38, and presses the main rope 9 against the sheave 6.

[0017] The auxiliary device opening 30 displaces the movable frame 31 against the auxiliary device spring 38 in a direction in which the outer peripheral force of the sheave 6 is pulled away. That is, the auxiliary device opening portion 30 pulls the brake auxiliary roller 35 away from the main rope 9 via the movable frame 31. Also, the auxiliary device opening 30 releases the auxiliary device spring 38 during emergency braking. The auxiliary device opening portion 30 is operated in conjunction with the emergency braking operation of the brake device ₇ .

[0018] As the auxiliary device opening portion 30, an electromagnetic magnet or the like is used in the same manner as the brake opening portion 19. For example, when an electromagnetic magnet is used as the opening part 30 for the auxiliary device, the brake auxiliary roller 35 is separated from the sheave 6 by exciting the electromagnetic magnet. Further, by deactivating the electromagnetic magnet, the auxiliary device spring 38 is released, and the main rope 9 is pressed against the sheave 6 by the brake auxiliary roller 35.

Next, the operation will be described. When the car 10 is in normal operation (including running and stopped), the movable frame 31 is displaced away from the outer periphery of the sheave 6 by the auxiliary device opening 30 as shown in FIG. For this reason, the brake auxiliary roller 35 is separated from the outer periphery of the sheave 6 and separated from the main rope 9.

On the other hand, when the force 10 is emergency braked, the auxiliary device spring 38 is released, so that the movable frame 31 is displaced in a direction approaching the outer periphery of the sheave 6 as shown in FIG. At the same time, the brake auxiliary roller 35 is pressed against the main rope 9.

[0021] When the brake auxiliary roller 35 is pressed against the main rope 9, the brake auxiliary roller 35 rolls on the surface of the main rope 9 until the sheave 6 stops rotating, and presses the main rope 9 against the sheave 6.

Here, FIG. 6 is an explanatory diagram for explaining the slip of the main rope 9 with respect to the sheave 6 of FIG.

First, the conditions for slipping between the sheave 6 and the main rope 9 will be described. In the drawing, tensions T 1 and T 2 are applied to both ends of the main rope 9 of the portion strung on the sheave 6 by the force, the cage 10 and the counterweight 11. At this time, the conditions under which the main rope 9 does not slip can be expressed as follows.

[0023] Ύΐ / Ύ2≤β ^β ' ^θ · · · (1)

Tl = mc-g: Cage 10 side static tension T2 = mw · g: counterweight 11 side static tension

mc: Weight of car 10 (car weight + load capacity)

mw: Mass of counterweight 11

g: Gravity acceleration

μ: Apparent coefficient of static friction between main rope 9 and sheave 6

Θ: Angle with flange

e: base of natural logarithm

However, since the value of μ varies greatly depending on the material of the sheave 6 and the main rope 9 and the shape of the groove 6a of the sheave 6, it is generally expressed by the following equation.

[0025] μ = μ '-k

μ: Static coefficient of friction determined by material of sheave 6 and main rope 9

k: Coefficient determined by the shape of groove 6a of sheave 6 (groove coefficient)

[0026] In addition, when the speed of the force 10 and the counterweight 11 is changing, the inertial force must be taken into account. The conditions under which the cable 9 does not slip can be expressed as follows.

[0027] Tl '/ T2'≤e ^u ' ^e (2)

Tl '= mc (g + a): Dynamic tension on the car 10 side

T2 '= mw (g-a): Balanced weight 11 side dynamic tension

a: Acceleration (or deceleration) of car 10 and counterweight 11

[0028] From equation (2), when braking by the brake device 7 is suddenly performed and the value of a increases,

It turns out that slip of 9 becomes easy to occur.

[0029] Furthermore, when the main rope 9 is pressed against the sheave 6 by the brake auxiliary roller 35, the pressing force applied by the brake auxiliary roller 35 received by the main rope 9 must be taken into account. The speed of 10 and the counterweight 11 will change. In this case, the condition that the main rope 9 does not slip can be expressed as follows.

[0030] (Τ1 '+ Ρ / Θ) / (Τ2' + Ρ / Θ) ≤6 ^μ ' ^θ (3)

Ρ: Pressing force by brake auxiliary roller 35 received by main rope 9

[0031] In equation (3), P / θ> 0, so car 10 and counterweight 1 compared to equation (2). Even if the acceleration a of 1 is large, the main rope 9 can be prevented from slipping. That is, it can be seen that the critical deceleration at which the main rope 9 slips increases.

[0032] Note that even if the dynamic friction coefficient is substituted into / in Equation (2) and Equation (3), the relationship between Equation (2) and Equation (3) is the same as when μ is a static friction coefficient. Even when the main rope 9 is pressed against the sheave 6 and the main rope 9 slips, the main rope 9 is not pressed against the sheave 6. I understand that.

[0033] In such an elevator brake auxiliary device 8, the main rope 9 is pressed against the sheave 6 by the brake auxiliary port roller 35 during emergency braking, so the frictional force between the sheave 6 and the main rope 9 is The slippage of the main rope 9 can be suppressed with a simpler configuration.

[0034] Further, since the brake auxiliary roller 35 is rotatable, the friction between the brake auxiliary roller 35 and the main rope 9 when the brake auxiliary roller 35 is pressed against the main rope 9 can be reduced. It is possible to prevent the life of the cable 9 from being shortened.

[0035] Further, since the auxiliary device opening 30 pulls the brake auxiliary roller 35 away from the main rope 9 against the auxiliary device spring 38 when the force 10 is normal, the load on the main rope 9 is more than necessary during normal operation. This prevents the main rope 9 from being shortened by contact with the brake auxiliary roller 35.

[0036] It should be noted that the cross-sectional shape of the main rope 9 is not particularly limited, but it is needless to say that a main cross-section having a flat cross section may be used even if a main cross-section having a circular cross section is used.

Further, the auxiliary roller portions 35a may be rotatable independently of each other.

Further, in the above example, a force indicating only one brake auxiliary roller may be provided. A plurality of brake auxiliary rollers may be arranged at intervals in the circumferential direction of the sheave.

Furthermore, in the above example, the brake auxiliary roller 35 is pressed against the main rope 9 by the auxiliary device spring 38, but it may be pressed by an actuator.

Moreover, the installation place of a drive device is not limited to the upper part of a hoistway. Furthermore, in the above example, the force roving method shown in the 1: 1 roving type elevator apparatus is not particularly limited. For example, the present invention can be applied to a 2: 1 roving type elevator apparatus.

Furthermore, in the above example, the driving device (lifting machine) 1 includes the brake device 7 and the brake Although the auxiliary device 8 is provided, the brake device 7 and the brake auxiliary device 8 may be provided on other sheaves such as a suspension car, a driving wheel or a return wheel, for example.

Claims

The scope of the claims

[1] A rotatable brake auxiliary roller that presses the main rope against the sheave braked by the brake device during emergency braking

Elevator brake assist device.

[2] a spring pressing the brake auxiliary roller against the main rope;

The brake auxiliary roller is pulled away from the main rope against the spring during normal operation, and an auxiliary device opening for releasing the spring during emergency braking.

The elevator brake auxiliary device according to claim 1, further comprising: