JPS606868B2 - Elevator emergency braking device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an emergency braking system for an elevator.

When installing an elevator, the space below the elevator may be restricted due to architectural circumstances, and it may not be possible to install a shock absorber with an operating rating that corresponds to the rated speed of the elevator such as a car.

At this time, a low-speed shock absorber having an operating rating corresponding to a speed lower than the rated speed of the elevating body is provided, and the elevating body is controlled as follows. That is, when the descending elevating body passes a predetermined position at the lower part of the hoistway, its speed is reduced to a speed corresponding to the low speed buffer. If deceleration is not possible due to a failure in the control system or the like, the drive device is braked to decelerate the elevating body. However, if the above effect is not achieved due to another cause, an accident may occur in which the elevating body collides with the low speed shock absorber at the rated speed. This invention solves the above-mentioned drawbacks, and is designed to actuate a braking device provided on the elevator when the speed of the descending elevator passing a predetermined position in the hoistway is higher than a predetermined speed. The purpose of the present invention is to provide an emergency braking system for an elevator that prevents the elevator from colliding with an elevator at a higher speed than its operating rating.

An embodiment of the present invention will be described below with reference to FIGS. 1 to 3.

In the figure, 1 is an elevating body consisting of a car, 2 is a braking device consisting of an emergency stop device installed on this, 2a is an operating arm of the braking device, 3 is a counterweight, 4 is a sheave of the driving device, and 5 is a main 7 is a drive electric motor, 8 is a power source, 9 is an electromagnetic brake that brakes the sheave 3, 9a is a speed detection device consisting of a coil of this, and a 1st river control device, and 10a is a speed detection device installed on this. The normally closed contact of the switch, 10b is a normally open contact, 11 is a speed governor rope, and the rope is held by the operating arm 2a.

12a and 12b are normally open contacts of the main circuit contactor, 12c is a normally closed contact, 13 is a low speed buffer with an operating rating that corresponds to a lower speed than the rated lift of the elevator. A first position detection device consisting of a hoistway switch provided at a predetermined position at the bottom of the road, 14a is a normally closed contact of this, and 15 is a second position detection device provided below the first position detection device.
15a is a normally open contact of this device; 16 is a cam provided on the elevating body 1 and arranged to correspond to the first and second position detection devices 14 and 16; ear 7 is the actuation of the electromagnetic brake. In the command relay, 17a is its normally open contact, 18 is an actuating device consisting of a gripping device for the governor rope 1, 19 is a fixed gripper provided on a fixed part, and 20' is the governor rope 1.
The movable gripper is disposed opposite to the fixed gripper 19 via 1, and one of the movable grippers has a holding bar 20a that is loosely inserted into the fixed part, and is thereby held in the fixed part.

20b is an increased diameter portion formed at the protruding end of the holding rod 28a.
Reference numeral 21 denotes a biasing body made of a compression coil spring inserted through the holding rod 20a, and both ends of the biasing body are supported by the movable gripper 20 and the fixed part, respectively.

Reference numerals 22 and 23 denote levers whose intermediate portions are pivotally connected to the fixed portion and are arranged opposite to each other, and one end thereof has copper portions 22a and 23a that engage with the increased diameter portion 20b of the holding rod 20a.
is provided.

24 is a coil attached to the opposite end of the hook portion 22b of the bar 22, and 25 is a movable iron corresponding to the coil 24 provided on the bar 23. Numerals ○, 10, and 1 are power sources.

That is, under normal conditions, the coil 24 is deenergized, and the hooks 22a and 23a of the levers 22 and 23 are connected to the movable gripper 20.
The movable gripper 20 is engaged with the increased diameter portion 20b of the movable gripper 20 and is held at the retreated position against the biasing body 21.

Therefore, the governor rope 11' moves without being restrained by the actuating device 18. Further, the contacts 10a and 10b of the speed detecting device 10 are connected to the buffer 1 for low speed when the speed of the elevating body 1 is low.
It is set to operate when the speed is higher than the speed corresponding to 3. When the elevator is running normally, the operation command relay 17 is energized by the circuit 114a-17-- or 1110a-17--, and the contact 17a is activated.
is closed, and contact 12b is also closed. As a result, the coil 9a is energized by the circuit 117a-12b-19a, and the electromagnetic brake 9 is released.

Now, if the first detection device 14 is pressed via the cam 16 by the descending elevating body 1', the contact 14a is opened.

If the speed of the elevating body 1 at this time is lower than the speed corresponding to the low speed buffer 13, the elevating body 1 continues to descend. However, when the speed of the elevator turtle is higher than the corresponding speed of the low speed buffer 13, the contact 10a is opened. Therefore, the operation command relay 17 is deenergized and the contact 17a is opened, so that the coil 9a is deenergized and the electromagnetic brake 9 is operated. At the same time, the normally open contact 12a of the main circuit contactor opens, the normally open contact 12c closes, and a dynamic braking force acts on the motor 7. In this way, the sheave 4 is braked and the elevating body is decelerated. Due to such an effect, a so-called end floor forced deceleration device is constructed which can ensure the safety of the elevating body 1 even if the low-speed shock absorber quantity 3 is installed. However, if the elevating body 1 does not decelerate even after passing the predetermined position where the first position detecting device is arranged due to a failure of the electromagnetic brake 9 or the like, the second position detecting device turtle 5 is pressed by the cam 16 and the contact 15a is closed. At this time, the contacts 10b are closed, so 1110b15a
The coil 24 is energized by the circuit -24--, and the movable iron core 25 is attracted. In Fig. 2, the lever 2
2 is rotated counterclockwise, and the lever 23 is rotated clockwise to rotate the brocade portion 22a, 23a and the increased diameter portion 2 of the holding rod 20a.
0 is disengaged. Therefore, the movable gripper moves forward by two degrees by the biasing body 21, and the governor rope 11 is gripped and fixed between it and the fixed gripper 19. by this"
When the actuating arm 2a is displaced and the braking device 2 operates, the elevating body 1 is braked. Elevating body 1 by this braking device 2
The deceleration can be made larger than the deceleration caused by the electromagnetic brake 9. This is the main element 5 in electromagnetic brake 9.
Although it is not possible to obtain a large deceleration due to the slippage of
This is because the braking device 2 does not have this limitation and can increase the deceleration to the limit that the passengers can withstand. In this way,
Since the lifting body 1 is directly braked by the braking device 2, an accident in which the lifting body 1 collides with the low-speed shock absorber 13 at a higher speed than its corresponding speed due to malfunction of the end floor forced deceleration device etc. is prevented. can do. In this embodiment, the braking device 2 is made up of an emergency stop device, but this is configured separately from the emergency stop device, and is provided on the elevating body and engaged with the guide rail. It is clear that a similar effect can be obtained with a suitable braking device. Further, the first position detecting device neck 4 shown in FIGS. 1 to 3 is provided at a predetermined position on the upper part of the hoistway, and a second detecting device 5 is provided above this.

As a result, the rising speed and position of the elevating body 1 are detected, the braking device 2 of the elevating body 1 is operated, and the counterweight 3 is activated.
It is also possible to prevent the vehicle from colliding with the low-speed buffer at a higher speed than the corresponding speed. As explained above, in this invention, when the elevating body reaches the first position near the hoistway oribe and the speed of the elevating body exceeds a predetermined value, the electromagnetic brake provided in the drive device is actuated to raise and lower the elevating body. When the body is decelerated and the elevating body reaches the second position, which is closer to the end of the hoistway than the first position, if the speed of the elevating body exceeds the above-mentioned predetermined value, the brake provided on the hoisting body decelerates. Since the device is operated to brake the elevating object, the elevating object can be directly braked, and even if a low-speed shock absorber is provided, the elevating object will fall into the shock absorber at a higher speed than the corresponding speed. It is possible to prevent accidents in which the vehicle collides with the vehicle.

Further, accidents caused by failure of the end floor forced speed reduction device can also be prevented.

[Brief explanation of the drawing]

FIG. 1 is a conceptual diagram of an elevator system showing an embodiment of an emergency braking system for an elevator according to the present invention, FIG. 2 is a cross-sectional plan view of the actuating device shown in FIG. 1, and FIG. It is a circuit diagram. DESCRIPTION OF SYMBOLS 1... Lifting body, 2... Stagnation motion device, 2a... Actuation arm, 9... Electromagnetic brake, 10... Speed detection device, 11
...Governor rope, 13...Low speed buffer, 14
......First position detection device, 15...Second position detection device, 18...Actuation device, 19...Fixed gripper, 2
0...Movable gripper, 21...--Biasing body, 22
, 23...Lever, 24...Coil, 25...Movable iron○
Note that the same parts in the figures are indicated by the same reference numerals. Figure 2 Turtle Figure 3

Claims (1)

[Claims] 1 The drive device that drives the lifting body is equipped with an electromagnetic brake that decelerates the lifting body, and a buffer is installed at the end of the hoistway to buffer collisions with the lifting body, and the operating rating of this buffer is The braking device is set to a predetermined value lower than the rated speed of the elevating body, and the braking device is provided on the elevating body and brakes the elevating body, when the elevating body reaches a first position near the end of the hoistway. a first position detecting device that operates; a first circuit that operates the electromagnetic brake if the speed of the elevating body exceeds the predetermined value when the first position detecting device operates; and a first circuit that operates the electromagnetic brake; a second position detecting device that operates when the end of the hoistway is approached further than the second position detecting device; and when the second position detecting device operates, the braking device is actuated if the speed of the elevating body exceeds the predetermined value. An emergency braking device for an elevator, comprising a second circuit.