JP2000219464A - Elevator electromagnetic brake opening device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an elevator electromagnetic brake opening device capable of releasing braking force of an elevator brake safely and easily. SOLUTION: An electromagnetic brake is composed of a pair of main levers 6 provided with brake springs 14 and applying braking force by making linings 11 abut on a cylindrical brake drum 12 mounted to a rotary shaft of an elevator hoisting machine; an electromagnetic device composed of a core, a plunger and a coil; a pair of L-shaped levers 5 rotated to transmit the movement of the plunger moving vertically upward to the core side when the coil is excited, to horizontally move the main levers 6 by specified dimension; and auxiliary springs 8 provided at one ends of the C-shaped levers 5 and imparting force for previously offsetting the weight of the plunger. In such constitution, an electromagnetic brake opening device is provided with brake spring pressure releasing devices 15, 16, 18 for rotating the L-shaped levers 5 in the pressure applying direction of the auxiliary springs 8.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to an elevator electromagnetic brake release device.

[0002]

2. Description of the Related Art Conventionally, there has been provided a two-leg lever which is freely connected to an arbitrary angle with a connecting portion as a fulcrum, and the arm of the electromagnetic brake is opened by the two-leg lever against a braking spring. In a manual release device for an electromagnetic brake configured to release a braking force, an L-shaped engaging element that engages with the arm is provided at one end of each lever of the two legs, and the other end of at least one lever is connected to the other end of the lever. An elevator electromagnetic, which is rotatably provided on one of the levers, extending from the connecting portion, and having a hook for opening the electromagnetic brake arm while maintaining the opening angle of the two-leg lever at a predetermined angle. The technology related to the brake release device is actual fairness 3-201
No. 1 publication.

[0003]

The above-mentioned prior art elevator electromagnetic brake opening device releases the braking force by directly moving the main lever, and is used for a car having a large load on the car and a large braking force on the brake. Has the drawback that it cannot be applied. If the structure is adapted to directly move the main lever, there may be a problem that the length of the lever of the two legs for opening the arm of the electromagnetic brake becomes long or that two persons have to work.

[0004] Further, a gearless type elevator in which a sheave for hanging a rope directly on a rotating shaft of a motor, and an elevator in which a helical gear is used for the rotating shaft of the motor and the rotating shaft of the sheave are known as elevator electromagnetic systems. It is very dangerous to keep the braking force of the brake in the released state by using the hook of the brake release device because the free-running car or the counterweight is pulled by the heavier one and falls free. The dangers of rescuing passengers trapped in a car are even greater.

SUMMARY OF THE INVENTION It is an object of the present invention to provide an elevator electromagnetic brake release device which can safely and easily release the braking force of an elevator brake.

[0006]

SUMMARY OF THE INVENTION In order to achieve the above object, the present invention provides a cylindrical brake drum having a predetermined diameter which is mounted on a rotating shaft of an elevator hoist, and which can freely contact the brake drum. A lining, a pair of main levers to which the lining is attached, and a braking spring for applying a braking force to the brake drum, an electromagnetic device including a core, a plunger, and a coil; and the coil is excited. Then, the movement of the plunger moving vertically upward to the core side is transmitted by rotating, and a pair of L-shaped levers for horizontally moving the pair of main levers by a predetermined dimension, and a pair of L-shaped levers And an auxiliary spring provided at one end and applying a force for at least reducing the weight of the plunger in advance. Te, those having a brake spring pressure release device for rotating the L-shaped lever in the pressure applying direction of the auxiliary spring.

[0007] With this configuration, the braking force due to the frictional resistance between the brake drum and the lining that prevents the car from moving up and down can be released by applying a force in the pressure application direction of the auxiliary spring to rotate the L-shaped lever. By doing so, the plunger can be easily moved upward, and can be released with a smaller force than actuation of the main lever, so that the release operation of the electromagnetic brake braking force can be easily performed by one person.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention will be described below with reference to FIGS.

FIG. 1 is a front view of an electromagnetic brake for explaining an electromagnetic brake release device according to an embodiment of the present invention, and FIG. 2 is a front view of the electromagnetic brake release device of one embodiment of the present invention. FIG. 3 is a diagram corresponding to FIG. 1 showing another embodiment of the present invention, and FIG. 4 is a diagram corresponding to FIG. 2 of an electromagnetic brake release device of another embodiment.

First, the structure of an elevator brake device will be described with reference to FIG.

In FIG. 1, an electromagnetic brake 1 has a plunger (not shown) which is attracted to a core (not shown) by excitation of a coil (not shown) mounted inside a case 2. A roller receiving plate 3 is connected to a plunger (not shown), and one end of an L-shaped lever 5 that is supported at a fulcrum 5a at the center via a roller 4 that comes into contact with the roller receiving plate 3 is attached. The other end of the L-shaped lever 5 is supported at a fulcrum 5b by a spring mounting rod 7 inserted into a hole provided at an upper end of the main lever 6 of the electromagnetic brake 1.
The spring mounting rod 7 has an auxiliary spring 8 mounted thereon. The auxiliary spring 8 moves upward when a plunger (not shown) is sucked by a core (not shown), and the roller receiving plate 3 and the roller 4 are moved. In order to reduce the weight of the plunger (not shown), a spring force is applied in advance in the rotation direction of the L-shaped lever 5 in order to speed up the rotation of the L-shaped lever 5 accompanying this. Also,
The tip of the push bolt 9 fastened to the main lever 6 is in contact with the L-shaped lever 5. The main lever 6 is rotatably supported at its lower end by a beam (not shown), a shoe 10 which is rotatable at a predetermined angle is fastened to a central portion, and a lining 11 fastened to the shoe 10 is a hoisting machine (see FIG. (Not shown) is in contact with a brake drum 12 attached to a rotating shaft, and a braking spring 14 provided at both ends of a rod 13 penetrating the upper portion applies a braking force to stop the rotating force of the brake drum 12. .

Here, the operation of the electromagnetic brake 1 is such that when a coil (not shown) is excited, a plunger (not shown) is attracted to a core (not shown) side, and the roller receiving plate 3 is moved upward. When the L-shaped lever 5 is moved, the push bolt 9 and the main lever 6 are moved by rotating, and the lining 11 is released from contact with the brake drum 12.

Next, the structure of the electromagnetic brake release device 15 will be described with reference to FIG.

In FIG. 2, the electromagnetic brake release device 15
The hydraulic ram 18 is removably attached to a fixture 17 provided inside one of the opposed sides of the U-shaped bracket 16 with bolts 17A.
A main lever pusher 19 is attached to the end of 8A, and the hydraulic ram 18 is connected to a hydraulic pump 20 having a handle 20B via a hose 20A. Also, the hydraulic pump 2
0 is provided with a stopper 20C for releasing the pressure of the pump.

[0015] The electromagnetic brake release device 1 having such a configuration.
5 is a case in which a person is trapped in a car (not shown) due to a failure of the elevator and a situation in which the car (not shown) cannot be raised or lowered by electric forced operation (for example, a power failure) At this time, the braking force of the electromagnetic brake 1 is released and a car (not shown) is moved up and down.

Hereinafter, a method of using the electromagnetic brake release device 15 will be described with reference to FIG.

First, the electromagnetic brake release device 15 is mounted on the electromagnetic brake 1 by hooking one side of the U-shaped bracket 16 on the case 2 side of the fulcrum 5b of the L-shaped lever 5 and holding the tip of the main lever pressing tool 19 at the end. The plunger 18A is pushed out by moving the handle 20B of the hydraulic pump 20 to feed the oil to the hydraulic ram 18 until it comes into contact with the tip of the main lever 6, whereby the L-shaped lever 5 and the upper end of the main lever 6 are sandwiched and fixed.

Next, when the braking force of the electromagnetic brake 1 is released, the handle 20B is further moved to apply pressure to the L-shaped lever 5 and the main lever 6, so that the L-shaped lever 5 is moved to the fulcrum 5a.
Is pivoted to move the roller receiving plate 3 upward to lift a plunger (not shown) in the case 2 and to push bolts 9 fastened to the main lever 6.
When the main lever 6 is moved horizontally by a predetermined dimension by pressing, the lining 11 fastened to the shoe 10 fastened to the main lever 6 is separated from the brake drum 12, so that a car (not shown) and a counterweight ( The car (not shown) is moved to the heavier side of the load (not shown), and the landing door (not shown)
A car (not shown) is stopped in the vicinity of. Here, by loosening the plug 20C provided on the hydraulic pump 20, the pressure in the hydraulic ram 18 is released, and the plunger 18A is lowered.
The pressure between the L-shaped lever 5 and the main lever 6 is released, and the lining 11 abuts on the brake drum 12 to apply a braking force to stop a car (not shown). Further, by alternately opening and closing the stopper 20C and operating the handle 20B, it is possible to suppress the speed at which the car (not shown) moves up and down.

According to this embodiment, the electromagnetic brake release device 15 releases and applies the braking force of the electromagnetic brake 1 by hydraulic pressure, so that no labor is required, and the brake drum 12 and the sheave (not shown) are used. ) Can be operated at a position distant from the rotating part, thus ensuring safety.

As another embodiment of the electromagnetic brake release device 15, as shown in FIGS. 3 and 4, a long brake release lever 21 is provided at a fulcrum 5b of the L-shaped lever 5.
Abutment surface 22 formed on the same curved surface as the end surface of case 2
A, a fulcrum 23 to be brought into contact with the case 2 on the opposite side of the contact surface 22A, and a lever 24. The case 2 of the fulcrum 5b of the L-shaped lever 5 of the electromagnetic brake 1 is provided. The contact surface 22 </ b> A is brought into contact with the end surface on the side, the brake release lever 21 is inserted so that the fulcrum 23 is brought into contact with the case 2, and the lever 24 is pushed toward the case 2, whereby the L-shaped lever 5 is moved. The car (not shown) is raised and lowered by rotating the brake to release the braking force of the electromagnetic brake 1.

The production cost of such a brake release lever 21 is low.

[0022]

According to the present invention, the release of the braking force due to the frictional resistance between the brake drum and the lining that prevents the car from moving up and down is achieved by applying a force in the direction of applying the pressure of the auxiliary spring.
By rotating the L-shaped lever, the plunger can be easily moved upward, and a force smaller than the actuation of the main lever can be released. Therefore, the release work of the electromagnetic brake braking force can be easily performed by one person. be able to.

[Brief description of the drawings]

FIG. 1 is a front view of an electromagnetic brake for explaining a use state of an electromagnetic brake release device according to an embodiment of the present invention.

FIG. 2 is a front view of the electromagnetic brake release device according to the embodiment of the present invention.

FIG. 3 is a diagram corresponding to FIG. 1, showing another embodiment of the present invention.

FIG. 4 is a diagram corresponding to FIG. 2 of an electromagnetic brake release device according to another embodiment of the present invention.

[Explanation of symbols]

 Reference Signs List 1 electromagnetic brake 2 case 5 L-shaped lever 6 main lever 8 auxiliary spring 11 lining 12 brake drum 15 electromagnetic brake release device 16 U-shaped bracket 18 hydraulic ram 18A plunger 19 main lever pressing tool 20 hydraulic pump 20B handle 20C stopper 21 brake Release lever 22 Working part 22A Contact surface 23 Support point

Claims (3)

[Claims] 1. A cylindrical brake drum having a predetermined diameter, which is mounted on a rotating shaft of an elevator hoist, a lining that can abut on the brake drum, and a lining attached to the brake drum. A pair of main levers to which a braking spring for applying power is attached, an electromagnetic device including a core, a plunger, and a coil; and the movement of the plunger, which moves vertically upward toward the core when the coil is excited. A pair of L-shaped levers that transmit by rotating and horizontally move the pair of main levers by a predetermined dimension, and a force provided at one end of these L-shaped levers for at least reducing the weight of the plunger in advance. In an opening device for an elevator electromagnetic brake comprising an auxiliary spring to be applied, the L-shaped lever is moved in a direction in which the auxiliary spring applies pressure. An opening device for an elevator electromagnetic brake, comprising a brake spring pressure release device for rotating. 2. The braking spring pressure release device comprises: a pair of locking members which are removably locked to an end of the main lever and an end of the L-shaped lever on a side where the auxiliary spring is mounted, and 2. The release device for an elevator electromagnetic brake according to claim 1, further comprising: a hydraulic device for moving at least one of said locking members. 3. The braking spring pressure release device is configured to have an action portion having a contact surface formed on the same curved surface as the mounting end of the auxiliary spring of the L-shaped lever, and to be opposed to the contact surface. 2. An opening device for an elevator electromagnetic brake according to claim 1, wherein said device has an elongated body shape having a fulcrum provided in a direction and abutting on a case of said electromagnetic device.